Mercurial > public > mercurial-scm > hg
annotate rust/hg-core/src/revlog/mod.rs @ 50974:1928b770e3e7
rust: use the new `UncheckedRevision` everywhere applicable
This step converts all revisions that shouldn't be considered "valid" in any
context to `UncheckedRevison`, allowing `Revision` to be changed for a
stronger type in a later changeset.
Note that the conversion from unchecked to checked is manual and requires
at least some thought from the programmer, although directly using `Revision`
is still possible. A later changeset will make this mistake harder to make.
author | Rapha?l Gom?s <rgomes@octobus.net> |
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date | Thu, 10 Aug 2023 11:00:34 +0200 |
parents | 9929c8a73488 |
children | 27e773aa607d |
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1 // Copyright 2018-2023 Georges Racinet <georges.racinet@octobus.net> |
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2 // and Mercurial contributors |
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3 // |
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4 // This software may be used and distributed according to the terms of the |
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5 // GNU General Public License version 2 or any later version. |
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6 //! Mercurial concepts for handling revision history |
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7 |
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8 pub mod node; |
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9 pub mod nodemap; |
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10 mod nodemap_docket; |
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11 pub mod path_encode; |
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12 pub use node::{FromHexError, Node, NodePrefix}; |
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13 pub mod changelog; |
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14 pub mod filelog; |
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15 pub mod index; |
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16 pub mod manifest; |
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17 pub mod patch; |
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18 |
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19 use std::borrow::Cow; |
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20 use std::io::Read; |
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21 use std::ops::Deref; |
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22 use std::path::Path; |
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23 |
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24 use flate2::read::ZlibDecoder; |
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25 use sha1::{Digest, Sha1}; |
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26 use std::cell::RefCell; |
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27 use zstd; |
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28 |
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29 use self::node::{NODE_BYTES_LENGTH, NULL_NODE}; |
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30 use self::nodemap_docket::NodeMapDocket; |
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31 use super::index::Index; |
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32 use super::nodemap::{NodeMap, NodeMapError}; |
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33 use crate::errors::HgError; |
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34 use crate::vfs::Vfs; |
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35 |
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36 /// Mercurial revision numbers |
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37 /// |
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38 /// As noted in revlog.c, revision numbers are actually encoded in |
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39 /// 4 bytes, and are liberally converted to ints, whence the i32 |
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40 pub type Revision = i32; |
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41 |
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42 /// Unchecked Mercurial revision numbers. |
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43 /// |
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44 /// Values of this type have no guarantee of being a valid revision number |
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45 /// in any context. Use method `check_revision` to get a valid revision within |
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46 /// the appropriate index object. |
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47 /// |
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48 /// As noted in revlog.c, revision numbers are actually encoded in |
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49 /// 4 bytes, and are liberally converted to ints, whence the i32 |
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50 #[derive( |
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51 Debug, |
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52 derive_more::Display, |
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53 Clone, |
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54 Copy, |
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55 Hash, |
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56 PartialEq, |
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57 Eq, |
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58 PartialOrd, |
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59 Ord, |
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60 )] |
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61 pub struct UncheckedRevision(i32); |
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62 |
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63 impl From<Revision> for UncheckedRevision { |
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64 fn from(value: Revision) -> Self { |
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65 Self(value) |
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66 } |
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67 } |
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68 |
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69 /// Marker expressing the absence of a parent |
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70 /// |
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71 /// Independently of the actual representation, `NULL_REVISION` is guaranteed |
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72 /// to be smaller than all existing revisions. |
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73 pub const NULL_REVISION: Revision = -1; |
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74 |
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75 /// Same as `mercurial.node.wdirrev` |
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76 /// |
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77 /// This is also equal to `i32::max_value()`, but it's better to spell |
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78 /// it out explicitely, same as in `mercurial.node` |
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79 #[allow(clippy::unreadable_literal)] |
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80 pub const WORKING_DIRECTORY_REVISION: UncheckedRevision = |
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81 UncheckedRevision(0x7fffffff); |
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82 |
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83 pub const WORKING_DIRECTORY_HEX: &str = |
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84 "ffffffffffffffffffffffffffffffffffffffff"; |
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85 |
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86 /// The simplest expression of what we need of Mercurial DAGs. |
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87 pub trait Graph { |
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88 /// Return the two parents of the given `Revision`. |
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89 /// |
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90 /// Each of the parents can be independently `NULL_REVISION` |
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91 fn parents(&self, rev: Revision) -> Result<[Revision; 2], GraphError>; |
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92 } |
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93 |
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94 #[derive(Clone, Debug, PartialEq)] |
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95 pub enum GraphError { |
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96 ParentOutOfRange(Revision), |
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97 } |
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98 |
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99 /// The Mercurial Revlog Index |
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100 /// |
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101 /// This is currently limited to the minimal interface that is needed for |
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102 /// the [`nodemap`](nodemap/index.html) module |
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103 pub trait RevlogIndex { |
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104 /// Total number of Revisions referenced in this index |
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105 fn len(&self) -> usize; |
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106 |
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107 fn is_empty(&self) -> bool { |
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108 self.len() == 0 |
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109 } |
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110 |
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111 /// Return a reference to the Node or `None` for `NULL_REVISION` |
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112 fn node(&self, rev: Revision) -> Option<&Node>; |
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113 |
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114 /// Return a [`Revision`] if `rev` is a valid revision number for this |
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115 /// index |
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116 fn check_revision(&self, rev: UncheckedRevision) -> Option<Revision> { |
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117 let rev = rev.0; |
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118 |
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119 if rev == NULL_REVISION || (rev >= 0 && (rev as usize) < self.len()) { |
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120 Some(rev) |
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121 } else { |
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122 None |
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123 } |
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124 } |
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125 } |
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126 |
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127 const REVISION_FLAG_CENSORED: u16 = 1 << 15; |
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128 const REVISION_FLAG_ELLIPSIS: u16 = 1 << 14; |
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129 const REVISION_FLAG_EXTSTORED: u16 = 1 << 13; |
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130 const REVISION_FLAG_HASCOPIESINFO: u16 = 1 << 12; |
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131 |
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132 // Keep this in sync with REVIDX_KNOWN_FLAGS in |
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133 // mercurial/revlogutils/flagutil.py |
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134 const REVIDX_KNOWN_FLAGS: u16 = REVISION_FLAG_CENSORED |
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135 | REVISION_FLAG_ELLIPSIS |
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136 | REVISION_FLAG_EXTSTORED |
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137 | REVISION_FLAG_HASCOPIESINFO; |
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138 |
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139 const NULL_REVLOG_ENTRY_FLAGS: u16 = 0; |
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140 |
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141 #[derive(Debug, derive_more::From, derive_more::Display)] |
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142 pub enum RevlogError { |
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143 InvalidRevision, |
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144 /// Working directory is not supported |
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145 WDirUnsupported, |
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146 /// Found more than one entry whose ID match the requested prefix |
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147 AmbiguousPrefix, |
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148 #[from] |
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149 Other(HgError), |
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150 } |
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151 |
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152 impl From<NodeMapError> for RevlogError { |
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153 fn from(error: NodeMapError) -> Self { |
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154 match error { |
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155 NodeMapError::MultipleResults => RevlogError::AmbiguousPrefix, |
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156 NodeMapError::RevisionNotInIndex(rev) => RevlogError::corrupted( |
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157 format!("nodemap point to revision {} not in index", rev), |
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158 ), |
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159 } |
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160 } |
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161 } |
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162 |
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163 fn corrupted<S: AsRef<str>>(context: S) -> HgError { |
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164 HgError::corrupted(format!("corrupted revlog, {}", context.as_ref())) |
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165 } |
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166 |
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167 impl RevlogError { |
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168 fn corrupted<S: AsRef<str>>(context: S) -> Self { |
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169 RevlogError::Other(corrupted(context)) |
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170 } |
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171 } |
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172 |
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173 /// Read only implementation of revlog. |
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174 pub struct Revlog { |
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175 /// When index and data are not interleaved: bytes of the revlog index. |
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176 /// When index and data are interleaved: bytes of the revlog index and |
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177 /// data. |
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178 index: Index, |
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179 /// When index and data are not interleaved: bytes of the revlog data |
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180 data_bytes: Option<Box<dyn Deref<Target = [u8]> + Send>>, |
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181 /// When present on disk: the persistent nodemap for this revlog |
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182 nodemap: Option<nodemap::NodeTree>, |
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183 } |
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184 |
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185 impl Revlog { |
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186 /// Open a revlog index file. |
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187 /// |
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188 /// It will also open the associated data file if index and data are not |
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189 /// interleaved. |
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190 pub fn open( |
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191 store_vfs: &Vfs, |
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192 index_path: impl AsRef<Path>, |
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193 data_path: Option<&Path>, |
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194 use_nodemap: bool, |
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195 ) -> Result<Self, HgError> { |
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196 let index_path = index_path.as_ref(); |
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197 let index = { |
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198 match store_vfs.mmap_open_opt(&index_path)? { |
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199 None => Index::new(Box::new(vec![])), |
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200 Some(index_mmap) => { |
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201 let index = Index::new(Box::new(index_mmap))?; |
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202 Ok(index) |
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203 } |
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204 } |
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205 }?; |
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206 |
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207 let default_data_path = index_path.with_extension("d"); |
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208 |
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209 // type annotation required |
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210 // won't recognize Mmap as Deref<Target = [u8]> |
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211 let data_bytes: Option<Box<dyn Deref<Target = [u8]> + Send>> = |
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212 if index.is_inline() { |
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213 None |
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214 } else { |
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215 let data_path = data_path.unwrap_or(&default_data_path); |
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216 let data_mmap = store_vfs.mmap_open(data_path)?; |
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217 Some(Box::new(data_mmap)) |
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218 }; |
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219 |
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220 let nodemap = if index.is_inline() || !use_nodemap { |
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221 None |
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222 } else { |
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223 NodeMapDocket::read_from_file(store_vfs, index_path)?.map( |
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224 |(docket, data)| { |
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225 nodemap::NodeTree::load_bytes( |
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226 Box::new(data), |
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227 docket.data_length, |
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228 ) |
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229 }, |
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230 ) |
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231 }; |
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232 |
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233 Ok(Revlog { |
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234 index, |
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235 data_bytes, |
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236 nodemap, |
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237 }) |
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238 } |
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239 |
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240 /// Return number of entries of the `Revlog`. |
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241 pub fn len(&self) -> usize { |
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242 self.index.len() |
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243 } |
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244 |
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245 /// Returns `true` if the `Revlog` has zero `entries`. |
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246 pub fn is_empty(&self) -> bool { |
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247 self.index.is_empty() |
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248 } |
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249 |
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250 /// Returns the node ID for the given revision number, if it exists in this |
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251 /// revlog |
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252 pub fn node_from_rev(&self, rev: UncheckedRevision) -> Option<&Node> { |
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253 if rev == NULL_REVISION.into() { |
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254 return Some(&NULL_NODE); |
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255 } |
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256 let rev = self.index.check_revision(rev)?; |
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257 Some(self.index.get_entry(rev)?.hash()) |
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258 } |
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259 |
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260 /// Return the revision number for the given node ID, if it exists in this |
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261 /// revlog |
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262 pub fn rev_from_node( |
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263 &self, |
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264 node: NodePrefix, |
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265 ) -> Result<Revision, RevlogError> { |
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266 let looked_up = if let Some(nodemap) = &self.nodemap { |
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267 nodemap |
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268 .find_bin(&self.index, node)? |
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269 .ok_or(RevlogError::InvalidRevision) |
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270 } else { |
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271 self.rev_from_node_no_persistent_nodemap(node) |
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272 }; |
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273 |
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274 if node.is_prefix_of(&NULL_NODE) { |
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275 return match looked_up { |
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276 Ok(_) => Err(RevlogError::AmbiguousPrefix), |
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277 Err(RevlogError::InvalidRevision) => Ok(NULL_REVISION), |
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278 res => res, |
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279 }; |
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280 }; |
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281 |
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282 looked_up |
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283 } |
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284 |
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285 /// Same as `rev_from_node`, without using a persistent nodemap |
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286 /// |
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287 /// This is used as fallback when a persistent nodemap is not present. |
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288 /// This happens when the persistent-nodemap experimental feature is not |
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289 /// enabled, or for small revlogs. |
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290 fn rev_from_node_no_persistent_nodemap( |
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291 &self, |
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292 node: NodePrefix, |
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293 ) -> Result<Revision, RevlogError> { |
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294 // Linear scan of the revlog |
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295 // TODO: consider building a non-persistent nodemap in memory to |
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296 // optimize these cases. |
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297 let mut found_by_prefix = None; |
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298 for rev in (0..self.len() as Revision).rev() { |
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299 let index_entry = self.index.get_entry(rev).ok_or_else(|| { |
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300 HgError::corrupted( |
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301 "revlog references a revision not in the index", |
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302 ) |
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303 })?; |
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304 if node == *index_entry.hash() { |
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305 return Ok(rev); |
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306 } |
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307 if node.is_prefix_of(index_entry.hash()) { |
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308 if found_by_prefix.is_some() { |
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309 return Err(RevlogError::AmbiguousPrefix); |
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310 } |
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311 found_by_prefix = Some(rev) |
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312 } |
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313 } |
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314 found_by_prefix.ok_or(RevlogError::InvalidRevision) |
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315 } |
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316 |
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317 /// Returns whether the given revision exists in this revlog. |
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318 pub fn has_rev(&self, rev: UncheckedRevision) -> bool { |
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319 self.index.check_revision(rev).is_some() |
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320 } |
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321 |
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322 /// Return the full data associated to a revision. |
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323 /// |
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324 /// All entries required to build the final data out of deltas will be |
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325 /// retrieved as needed, and the deltas will be applied to the inital |
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326 /// snapshot to rebuild the final data. |
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327 pub fn get_rev_data( |
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328 &self, |
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329 rev: UncheckedRevision, |
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330 ) -> Result<Cow<[u8]>, RevlogError> { |
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331 if rev == NULL_REVISION.into() { |
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332 return Ok(Cow::Borrowed(&[])); |
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333 }; |
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334 self.get_entry(rev)?.data() |
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335 } |
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336 |
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337 /// [`Self::get_rev_data`] for checked revisions. |
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338 pub fn get_rev_data_for_checked_rev( |
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339 &self, |
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340 rev: Revision, |
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341 ) -> Result<Cow<[u8]>, RevlogError> { |
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342 if rev == NULL_REVISION { |
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343 return Ok(Cow::Borrowed(&[])); |
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344 }; |
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345 self.get_entry_for_checked_rev(rev)?.data() |
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346 } |
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347 |
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348 /// Check the hash of some given data against the recorded hash. |
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349 pub fn check_hash( |
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350 &self, |
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351 p1: Revision, |
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352 p2: Revision, |
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353 expected: &[u8], |
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354 data: &[u8], |
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355 ) -> bool { |
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356 let e1 = self.index.get_entry(p1); |
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357 let h1 = match e1 { |
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358 Some(ref entry) => entry.hash(), |
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359 None => &NULL_NODE, |
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360 }; |
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361 let e2 = self.index.get_entry(p2); |
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362 let h2 = match e2 { |
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363 Some(ref entry) => entry.hash(), |
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364 None => &NULL_NODE, |
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365 }; |
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366 |
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367 hash(data, h1.as_bytes(), h2.as_bytes()) == expected |
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368 } |
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369 |
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370 /// Build the full data of a revision out its snapshot |
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371 /// and its deltas. |
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372 fn build_data_from_deltas( |
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373 snapshot: RevlogEntry, |
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374 deltas: &[RevlogEntry], |
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375 ) -> Result<Vec<u8>, HgError> { |
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376 let snapshot = snapshot.data_chunk()?; |
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377 let deltas = deltas |
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378 .iter() |
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379 .rev() |
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380 .map(RevlogEntry::data_chunk) |
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381 .collect::<Result<Vec<_>, _>>()?; |
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382 let patches: Vec<_> = |
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383 deltas.iter().map(|d| patch::PatchList::new(d)).collect(); |
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384 let patch = patch::fold_patch_lists(&patches); |
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385 Ok(patch.apply(&snapshot)) |
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386 } |
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387 |
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388 /// Return the revlog data. |
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389 fn data(&self) -> &[u8] { |
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390 match &self.data_bytes { |
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391 Some(data_bytes) => data_bytes, |
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392 None => panic!( |
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393 "forgot to load the data or trying to access inline data" |
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394 ), |
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395 } |
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396 } |
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397 |
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398 pub fn make_null_entry(&self) -> RevlogEntry { |
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399 RevlogEntry { |
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400 revlog: self, |
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401 rev: NULL_REVISION, |
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402 bytes: b"", |
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403 compressed_len: 0, |
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404 uncompressed_len: 0, |
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405 base_rev_or_base_of_delta_chain: None, |
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406 p1: NULL_REVISION, |
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407 p2: NULL_REVISION, |
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408 flags: NULL_REVLOG_ENTRY_FLAGS, |
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409 hash: NULL_NODE, |
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410 } |
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411 } |
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412 |
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413 fn get_entry_for_checked_rev( |
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414 &self, |
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415 rev: Revision, |
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416 ) -> Result<RevlogEntry, RevlogError> { |
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417 if rev == NULL_REVISION { |
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418 return Ok(self.make_null_entry()); |
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419 } |
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420 let index_entry = self |
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421 .index |
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422 .get_entry(rev) |
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423 .ok_or(RevlogError::InvalidRevision)?; |
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424 let start = index_entry.offset(); |
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425 let end = start + index_entry.compressed_len() as usize; |
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426 let data = if self.index.is_inline() { |
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427 self.index.data(start, end) |
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428 } else { |
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429 &self.data()[start..end] |
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430 }; |
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431 let base_rev = self |
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432 .index |
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433 .check_revision(index_entry.base_revision_or_base_of_delta_chain()) |
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434 .ok_or_else(|| { |
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435 RevlogError::corrupted(format!( |
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436 "base revision for rev {} is invalid", |
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437 rev |
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438 )) |
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439 })?; |
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440 let p1 = |
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441 self.index.check_revision(index_entry.p1()).ok_or_else(|| { |
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442 RevlogError::corrupted(format!( |
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443 "p1 for rev {} is invalid", |
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444 rev |
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445 )) |
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446 })?; |
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447 let p2 = |
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448 self.index.check_revision(index_entry.p2()).ok_or_else(|| { |
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449 RevlogError::corrupted(format!( |
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450 "p2 for rev {} is invalid", |
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451 rev |
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452 )) |
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453 })?; |
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454 let entry = RevlogEntry { |
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455 revlog: self, |
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456 rev, |
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457 bytes: data, |
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458 compressed_len: index_entry.compressed_len(), |
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459 uncompressed_len: index_entry.uncompressed_len(), |
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460 base_rev_or_base_of_delta_chain: if base_rev == rev { |
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461 None |
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462 } else { |
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463 Some(base_rev) |
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464 }, |
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465 p1, |
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466 p2, |
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467 flags: index_entry.flags(), |
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468 hash: *index_entry.hash(), |
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469 }; |
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470 Ok(entry) |
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471 } |
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472 |
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473 /// Get an entry of the revlog. |
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474 pub fn get_entry( |
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475 &self, |
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476 rev: UncheckedRevision, |
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477 ) -> Result<RevlogEntry, RevlogError> { |
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478 if rev == NULL_REVISION.into() { |
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479 return Ok(self.make_null_entry()); |
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480 } |
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481 let rev = self.index.check_revision(rev).ok_or_else(|| { |
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482 RevlogError::corrupted(format!("rev {} is invalid", rev)) |
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483 })?; |
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484 self.get_entry_for_checked_rev(rev) |
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485 } |
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486 } |
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487 |
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488 /// The revlog entry's bytes and the necessary informations to extract |
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489 /// the entry's data. |
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490 #[derive(Clone)] |
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491 pub struct RevlogEntry<'revlog> { |
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492 revlog: &'revlog Revlog, |
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493 rev: Revision, |
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494 bytes: &'revlog [u8], |
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495 compressed_len: u32, |
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496 uncompressed_len: i32, |
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497 base_rev_or_base_of_delta_chain: Option<Revision>, |
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498 p1: Revision, |
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499 p2: Revision, |
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500 flags: u16, |
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501 hash: Node, |
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502 } |
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503 |
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504 thread_local! { |
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505 // seems fine to [unwrap] here: this can only fail due to memory allocation |
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506 // failing, and it's normal for that to cause panic. |
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507 static ZSTD_DECODER : RefCell<zstd::bulk::Decompressor<'static>> = |
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508 RefCell::new(zstd::bulk::Decompressor::new().ok().unwrap()); |
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509 } |
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510 |
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511 fn zstd_decompress_to_buffer( |
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512 bytes: &[u8], |
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513 buf: &mut Vec<u8>, |
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514 ) -> Result<usize, std::io::Error> { |
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515 ZSTD_DECODER |
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516 .with(|decoder| decoder.borrow_mut().decompress_to_buffer(bytes, buf)) |
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517 } |
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518 |
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519 impl<'revlog> RevlogEntry<'revlog> { |
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520 pub fn revision(&self) -> Revision { |
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521 self.rev |
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522 } |
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523 |
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524 pub fn node(&self) -> &Node { |
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525 &self.hash |
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526 } |
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527 |
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528 pub fn uncompressed_len(&self) -> Option<u32> { |
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529 u32::try_from(self.uncompressed_len).ok() |
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530 } |
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531 |
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532 pub fn has_p1(&self) -> bool { |
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533 self.p1 != NULL_REVISION |
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534 } |
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535 |
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536 pub fn p1_entry( |
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537 &self, |
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538 ) -> Result<Option<RevlogEntry<'revlog>>, RevlogError> { |
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539 if self.p1 == NULL_REVISION { |
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540 Ok(None) |
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541 } else { |
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542 Ok(Some(self.revlog.get_entry_for_checked_rev(self.p1)?)) |
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543 } |
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544 } |
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545 |
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546 pub fn p2_entry( |
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547 &self, |
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548 ) -> Result<Option<RevlogEntry<'revlog>>, RevlogError> { |
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549 if self.p2 == NULL_REVISION { |
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550 Ok(None) |
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551 } else { |
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552 Ok(Some(self.revlog.get_entry_for_checked_rev(self.p2)?)) |
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553 } |
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554 } |
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555 |
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556 pub fn p1(&self) -> Option<Revision> { |
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557 if self.p1 == NULL_REVISION { |
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558 None |
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559 } else { |
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560 Some(self.p1) |
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561 } |
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562 } |
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563 |
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564 pub fn p2(&self) -> Option<Revision> { |
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565 if self.p2 == NULL_REVISION { |
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566 None |
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567 } else { |
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568 Some(self.p2) |
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569 } |
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570 } |
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571 |
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572 pub fn is_censored(&self) -> bool { |
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573 (self.flags & REVISION_FLAG_CENSORED) != 0 |
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574 } |
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575 |
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576 pub fn has_length_affecting_flag_processor(&self) -> bool { |
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577 // Relevant Python code: revlog.size() |
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578 // note: ELLIPSIS is known to not change the content |
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579 (self.flags & (REVIDX_KNOWN_FLAGS ^ REVISION_FLAG_ELLIPSIS)) != 0 |
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580 } |
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581 |
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582 /// The data for this entry, after resolving deltas if any. |
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583 pub fn rawdata(&self) -> Result<Cow<'revlog, [u8]>, RevlogError> { |
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584 let mut entry = self.clone(); |
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585 let mut delta_chain = vec![]; |
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586 |
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587 // The meaning of `base_rev_or_base_of_delta_chain` depends on |
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588 // generaldelta. See the doc on `ENTRY_DELTA_BASE` in |
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589 // `mercurial/revlogutils/constants.py` and the code in |
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590 // [_chaininfo] and in [index_deltachain]. |
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591 let uses_generaldelta = self.revlog.index.uses_generaldelta(); |
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592 while let Some(base_rev) = entry.base_rev_or_base_of_delta_chain { |
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593 entry = if uses_generaldelta { |
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594 delta_chain.push(entry); |
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595 self.revlog.get_entry_for_checked_rev(base_rev)? |
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596 } else { |
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597 let base_rev = UncheckedRevision(entry.rev - 1); |
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598 delta_chain.push(entry); |
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599 self.revlog.get_entry(base_rev)? |
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600 }; |
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601 } |
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602 |
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603 let data = if delta_chain.is_empty() { |
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604 entry.data_chunk()? |
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605 } else { |
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606 Revlog::build_data_from_deltas(entry, &delta_chain)?.into() |
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607 }; |
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608 |
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609 Ok(data) |
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610 } |
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611 |
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612 fn check_data( |
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613 &self, |
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614 data: Cow<'revlog, [u8]>, |
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615 ) -> Result<Cow<'revlog, [u8]>, RevlogError> { |
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616 if self.revlog.check_hash( |
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617 self.p1, |
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618 self.p2, |
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619 self.hash.as_bytes(), |
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620 &data, |
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621 ) { |
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622 Ok(data) |
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623 } else { |
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624 if (self.flags & REVISION_FLAG_ELLIPSIS) != 0 { |
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625 return Err(HgError::unsupported( |
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626 "ellipsis revisions are not supported by rhg", |
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627 ) |
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628 .into()); |
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629 } |
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630 Err(corrupted(format!( |
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631 "hash check failed for revision {}", |
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632 self.rev |
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633 )) |
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634 .into()) |
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635 } |
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636 } |
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637 |
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638 pub fn data(&self) -> Result<Cow<'revlog, [u8]>, RevlogError> { |
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639 let data = self.rawdata()?; |
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640 if self.rev == NULL_REVISION { |
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641 return Ok(data); |
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642 } |
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643 if self.is_censored() { |
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644 return Err(HgError::CensoredNodeError.into()); |
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645 } |
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646 self.check_data(data) |
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647 } |
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648 |
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649 /// Extract the data contained in the entry. |
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650 /// This may be a delta. (See `is_delta`.) |
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651 fn data_chunk(&self) -> Result<Cow<'revlog, [u8]>, HgError> { |
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652 if self.bytes.is_empty() { |
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653 return Ok(Cow::Borrowed(&[])); |
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654 } |
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655 match self.bytes[0] { |
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656 // Revision data is the entirety of the entry, including this |
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657 // header. |
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658 b'\0' => Ok(Cow::Borrowed(self.bytes)), |
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659 // Raw revision data follows. |
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660 b'u' => Ok(Cow::Borrowed(&self.bytes[1..])), |
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661 // zlib (RFC 1950) data. |
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662 b'x' => Ok(Cow::Owned(self.uncompressed_zlib_data()?)), |
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663 // zstd data. |
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664 b'\x28' => Ok(Cow::Owned(self.uncompressed_zstd_data()?)), |
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665 // A proper new format should have had a repo/store requirement. |
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666 format_type => Err(corrupted(format!( |
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667 "unknown compression header '{}'", |
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668 format_type |
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669 ))), |
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670 } |
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671 } |
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672 |
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673 fn uncompressed_zlib_data(&self) -> Result<Vec<u8>, HgError> { |
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674 let mut decoder = ZlibDecoder::new(self.bytes); |
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675 if self.is_delta() { |
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676 let mut buf = Vec::with_capacity(self.compressed_len as usize); |
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677 decoder |
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678 .read_to_end(&mut buf) |
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679 .map_err(|e| corrupted(e.to_string()))?; |
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680 Ok(buf) |
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681 } else { |
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682 let cap = self.uncompressed_len.max(0) as usize; |
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683 let mut buf = vec![0; cap]; |
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684 decoder |
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685 .read_exact(&mut buf) |
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686 .map_err(|e| corrupted(e.to_string()))?; |
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687 Ok(buf) |
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688 } |
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689 } |
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690 |
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691 fn uncompressed_zstd_data(&self) -> Result<Vec<u8>, HgError> { |
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692 let cap = self.uncompressed_len.max(0) as usize; |
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693 if self.is_delta() { |
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694 // [cap] is usually an over-estimate of the space needed because |
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695 // it's the length of delta-decoded data, but we're interested |
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696 // in the size of the delta. |
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697 // This means we have to [shrink_to_fit] to avoid holding on |
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698 // to a large chunk of memory, but it also means we must have a |
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699 // fallback branch, for the case when the delta is longer than |
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700 // the original data (surprisingly, this does happen in practice) |
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701 let mut buf = Vec::with_capacity(cap); |
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702 match zstd_decompress_to_buffer(self.bytes, &mut buf) { |
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703 Ok(_) => buf.shrink_to_fit(), |
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704 Err(_) => { |
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705 buf.clear(); |
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706 zstd::stream::copy_decode(self.bytes, &mut buf) |
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707 .map_err(|e| corrupted(e.to_string()))?; |
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708 } |
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709 }; |
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710 Ok(buf) |
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711 } else { |
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712 let mut buf = Vec::with_capacity(cap); |
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713 let len = zstd_decompress_to_buffer(self.bytes, &mut buf) |
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714 .map_err(|e| corrupted(e.to_string()))?; |
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715 if len != self.uncompressed_len as usize { |
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716 Err(corrupted("uncompressed length does not match")) |
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717 } else { |
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718 Ok(buf) |
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719 } |
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720 } |
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721 } |
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722 |
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723 /// Tell if the entry is a snapshot or a delta |
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724 /// (influences on decompression). |
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725 fn is_delta(&self) -> bool { |
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726 self.base_rev_or_base_of_delta_chain.is_some() |
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727 } |
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728 } |
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729 |
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730 /// Calculate the hash of a revision given its data and its parents. |
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731 fn hash( |
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732 data: &[u8], |
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733 p1_hash: &[u8], |
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734 p2_hash: &[u8], |
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735 ) -> [u8; NODE_BYTES_LENGTH] { |
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736 let mut hasher = Sha1::new(); |
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737 let (a, b) = (p1_hash, p2_hash); |
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738 if a > b { |
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739 hasher.update(b); |
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740 hasher.update(a); |
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741 } else { |
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742 hasher.update(a); |
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743 hasher.update(b); |
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744 } |
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745 hasher.update(data); |
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746 *hasher.finalize().as_ref() |
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747 } |
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748 |
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749 #[cfg(test)] |
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750 mod tests { |
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751 use super::*; |
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752 use crate::index::{IndexEntryBuilder, INDEX_ENTRY_SIZE}; |
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753 use itertools::Itertools; |
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754 |
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755 #[test] |
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756 fn test_empty() { |
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757 let temp = tempfile::tempdir().unwrap(); |
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758 let vfs = Vfs { base: temp.path() }; |
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759 std::fs::write(temp.path().join("foo.i"), b"").unwrap(); |
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760 let revlog = Revlog::open(&vfs, "foo.i", None, false).unwrap(); |
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761 assert!(revlog.is_empty()); |
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762 assert_eq!(revlog.len(), 0); |
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763 assert!(revlog.get_entry(0.into()).is_err()); |
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764 assert!(!revlog.has_rev(0.into())); |
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765 assert_eq!( |
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766 revlog.rev_from_node(NULL_NODE.into()).unwrap(), |
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767 NULL_REVISION |
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768 ); |
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769 let null_entry = revlog.get_entry(NULL_REVISION.into()).ok().unwrap(); |
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770 assert_eq!(null_entry.revision(), NULL_REVISION); |
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771 assert!(null_entry.data().unwrap().is_empty()); |
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772 } |
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773 |
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774 #[test] |
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775 fn test_inline() { |
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776 let temp = tempfile::tempdir().unwrap(); |
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777 let vfs = Vfs { base: temp.path() }; |
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778 let node0 = Node::from_hex("2ed2a3912a0b24502043eae84ee4b279c18b90dd") |
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779 .unwrap(); |
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780 let node1 = Node::from_hex("b004912a8510032a0350a74daa2803dadfb00e12") |
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781 .unwrap(); |
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782 let node2 = Node::from_hex("dd6ad206e907be60927b5a3117b97dffb2590582") |
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783 .unwrap(); |
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784 let entry0_bytes = IndexEntryBuilder::new() |
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785 .is_first(true) |
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786 .with_version(1) |
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787 .with_inline(true) |
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788 .with_offset(INDEX_ENTRY_SIZE) |
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789 .with_node(node0) |
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790 .build(); |
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791 let entry1_bytes = IndexEntryBuilder::new() |
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792 .with_offset(INDEX_ENTRY_SIZE) |
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793 .with_node(node1) |
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794 .build(); |
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795 let entry2_bytes = IndexEntryBuilder::new() |
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796 .with_offset(INDEX_ENTRY_SIZE) |
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797 .with_p1(0) |
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798 .with_p2(1) |
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799 .with_node(node2) |
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800 .build(); |
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801 let contents = vec![entry0_bytes, entry1_bytes, entry2_bytes] |
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802 .into_iter() |
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803 .flatten() |
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804 .collect_vec(); |
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805 std::fs::write(temp.path().join("foo.i"), contents).unwrap(); |
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806 let revlog = Revlog::open(&vfs, "foo.i", None, false).unwrap(); |
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807 |
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808 let entry0 = revlog.get_entry(0.into()).ok().unwrap(); |
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809 assert_eq!(entry0.revision(), 0); |
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810 assert_eq!(*entry0.node(), node0); |
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811 assert!(!entry0.has_p1()); |
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812 assert_eq!(entry0.p1(), None); |
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813 assert_eq!(entry0.p2(), None); |
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814 let p1_entry = entry0.p1_entry().unwrap(); |
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815 assert!(p1_entry.is_none()); |
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816 let p2_entry = entry0.p2_entry().unwrap(); |
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817 assert!(p2_entry.is_none()); |
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818 |
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819 let entry1 = revlog.get_entry(1.into()).ok().unwrap(); |
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820 assert_eq!(entry1.revision(), 1); |
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821 assert_eq!(*entry1.node(), node1); |
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822 assert!(!entry1.has_p1()); |
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823 assert_eq!(entry1.p1(), None); |
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824 assert_eq!(entry1.p2(), None); |
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825 let p1_entry = entry1.p1_entry().unwrap(); |
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826 assert!(p1_entry.is_none()); |
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827 let p2_entry = entry1.p2_entry().unwrap(); |
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828 assert!(p2_entry.is_none()); |
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829 |
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830 let entry2 = revlog.get_entry(2.into()).ok().unwrap(); |
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831 assert_eq!(entry2.revision(), 2); |
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832 assert_eq!(*entry2.node(), node2); |
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833 assert!(entry2.has_p1()); |
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834 assert_eq!(entry2.p1(), Some(0)); |
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835 assert_eq!(entry2.p2(), Some(1)); |
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836 let p1_entry = entry2.p1_entry().unwrap(); |
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837 assert!(p1_entry.is_some()); |
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838 assert_eq!(p1_entry.unwrap().revision(), 0); |
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839 let p2_entry = entry2.p2_entry().unwrap(); |
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840 assert!(p2_entry.is_some()); |
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841 assert_eq!(p2_entry.unwrap().revision(), 1); |
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842 } |
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843 |
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844 #[test] |
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845 fn test_nodemap() { |
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846 let temp = tempfile::tempdir().unwrap(); |
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847 let vfs = Vfs { base: temp.path() }; |
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848 |
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849 // building a revlog with a forced Node starting with zeros |
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850 // This is a corruption, but it does not preclude using the nodemap |
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851 // if we don't try and access the data |
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852 let node0 = Node::from_hex("00d2a3912a0b24502043eae84ee4b279c18b90dd") |
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853 .unwrap(); |
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854 let node1 = Node::from_hex("b004912a8510032a0350a74daa2803dadfb00e12") |
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855 .unwrap(); |
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856 let entry0_bytes = IndexEntryBuilder::new() |
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857 .is_first(true) |
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858 .with_version(1) |
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859 .with_inline(true) |
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860 .with_offset(INDEX_ENTRY_SIZE) |
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861 .with_node(node0) |
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862 .build(); |
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863 let entry1_bytes = IndexEntryBuilder::new() |
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864 .with_offset(INDEX_ENTRY_SIZE) |
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865 .with_node(node1) |
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866 .build(); |
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867 let contents = vec![entry0_bytes, entry1_bytes] |
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868 .into_iter() |
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869 .flatten() |
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870 .collect_vec(); |
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871 std::fs::write(temp.path().join("foo.i"), contents).unwrap(); |
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872 let revlog = Revlog::open(&vfs, "foo.i", None, false).unwrap(); |
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873 |
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874 // accessing the data shows the corruption |
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875 revlog.get_entry(0.into()).unwrap().data().unwrap_err(); |
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876 |
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877 assert_eq!(revlog.rev_from_node(NULL_NODE.into()).unwrap(), -1); |
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878 assert_eq!(revlog.rev_from_node(node0.into()).unwrap(), 0); |
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879 assert_eq!(revlog.rev_from_node(node1.into()).unwrap(), 1); |
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880 assert_eq!( |
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881 revlog |
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882 .rev_from_node(NodePrefix::from_hex("000").unwrap()) |
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883 .unwrap(), |
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884 -1 |
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885 ); |
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886 assert_eq!( |
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887 revlog |
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888 .rev_from_node(NodePrefix::from_hex("b00").unwrap()) |
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889 .unwrap(), |
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890 1 |
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891 ); |
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892 // RevlogError does not implement PartialEq |
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893 // (ultimately because io::Error does not) |
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894 match revlog |
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895 .rev_from_node(NodePrefix::from_hex("00").unwrap()) |
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896 .expect_err("Expected to give AmbiguousPrefix error") |
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897 { |
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898 RevlogError::AmbiguousPrefix => (), |
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899 e => { |
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900 panic!("Got another error than AmbiguousPrefix: {:?}", e); |
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901 } |
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902 }; |
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903 } |
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904 } |