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annotate rust/hg-core/src/revlog/filelog.rs @ 52760:94e2547e6f3d

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rust: move code from utils to utils::strings This moves string-related functions in hg::utils into the recently added hg::utils::strings module.
author Mitchell Kember <mkember@janestreet.com>
date Thu, 16 Jan 2025 13:15:02 -0500
parents 5af65969edaf
children 37e9e6e1f470
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 use crate::errors::HgError;
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2 use crate::exit_codes;
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3 use crate::repo::Repo;
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4 use crate::revlog::path_encode::path_encode;
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5 use crate::revlog::NodePrefix;
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6 use crate::revlog::Revision;
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7 use crate::revlog::RevlogEntry;
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8 use crate::revlog::{Revlog, RevlogError};
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9 use crate::utils::files::get_path_from_bytes;
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10 use crate::utils::hg_path::HgPath;
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11 use crate::utils::strings::SliceExt;
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12 use crate::Graph;
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13 use crate::GraphError;
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14 use crate::Node;
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15 use crate::UncheckedRevision;
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16 use std::path::PathBuf;
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17
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18 use super::options::RevlogOpenOptions;
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19
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20 /// A specialized `Revlog` to work with file data logs.
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21 pub struct Filelog {
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22 /// The generic `revlog` format.
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23 pub(crate) revlog: Revlog,
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24 }
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25
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26 impl Graph for Filelog {
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27 fn parents(&self, rev: Revision) -> Result<[Revision; 2], GraphError> {
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28 self.revlog.parents(rev)
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29 }
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30 }
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31
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32 impl Filelog {
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33 pub fn open_vfs(
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34 store_vfs: &crate::vfs::VfsImpl,
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35 file_path: &HgPath,
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36 options: RevlogOpenOptions,
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37 ) -> Result<Self, HgError> {
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38 let index_path = store_path(file_path, b".i");
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39 let data_path = store_path(file_path, b".d");
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40 let revlog =
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41 Revlog::open(store_vfs, index_path, Some(&data_path), options)?;
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42 Ok(Self { revlog })
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43 }
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44
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45 pub fn open(
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46 repo: &Repo,
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47 file_path: &HgPath,
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48 options: RevlogOpenOptions,
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49 ) -> Result<Self, HgError> {
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50 Self::open_vfs(&repo.store_vfs(), file_path, options)
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51 }
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52
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53 /// The given node ID is that of the file as found in a filelog, not of a
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54 /// changeset.
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55 pub fn data_for_node(
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56 &self,
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57 file_node: impl Into<NodePrefix>,
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58 ) -> Result<FilelogRevisionData, RevlogError> {
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59 let file_rev = self.revlog.rev_from_node(file_node.into())?;
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60 self.data_for_unchecked_rev(file_rev.into())
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61 }
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62
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63 /// The given revision is that of the file as found in a filelog, not of a
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64 /// changeset.
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65 pub fn data_for_unchecked_rev(
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66 &self,
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67 file_rev: UncheckedRevision,
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68 ) -> Result<FilelogRevisionData, RevlogError> {
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69 let data: Vec<u8> = self
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70 .revlog
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71 .get_data_for_unchecked_rev(file_rev)?
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72 .into_owned();
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73 Ok(FilelogRevisionData(data))
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74 }
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75
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76 /// The given node ID is that of the file as found in a filelog, not of a
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77 /// changeset.
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78 pub fn entry_for_node(
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79 &self,
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80 file_node: impl Into<NodePrefix>,
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81 ) -> Result<FilelogEntry, RevlogError> {
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82 let file_rev = self.revlog.rev_from_node(file_node.into())?;
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83 self.entry(file_rev)
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84 }
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85
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86 /// The given revision is that of the file as found in a filelog, not of a
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87 /// changeset.
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88 pub fn entry_for_unchecked_rev(
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89 &self,
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90 file_rev: UncheckedRevision,
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91 ) -> Result<FilelogEntry, RevlogError> {
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92 Ok(FilelogEntry(
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93 self.revlog.get_entry_for_unchecked_rev(file_rev)?,
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94 ))
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95 }
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96
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97 /// Same as [`Self::entry_for_unchecked_rev`] for a checked revision.
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98 pub fn entry(
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99 &self,
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100 file_rev: Revision,
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101 ) -> Result<FilelogEntry, RevlogError> {
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102 Ok(FilelogEntry(self.revlog.get_entry(file_rev)?))
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103 }
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104 }
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105
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106 fn store_path(hg_path: &HgPath, suffix: &[u8]) -> PathBuf {
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107 let encoded_bytes =
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108 path_encode(&[b"data/", hg_path.as_bytes(), suffix].concat());
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109 get_path_from_bytes(&encoded_bytes).into()
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110 }
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111
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112 pub struct FilelogEntry<'a>(pub(crate) RevlogEntry<'a>);
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113
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114 impl FilelogEntry<'_> {
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115 /// `self.data()` can be expensive, with decompression and delta
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116 /// resolution.
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117 ///
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118 /// *Without* paying this cost, based on revlog index information
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119 /// including `RevlogEntry::uncompressed_len`:
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120 ///
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121 /// * Returns `true` if the length that `self.data().file_data().len()`
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122 /// would return is definitely **not equal** to `other_len`.
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123 /// * Returns `false` if available information is inconclusive.
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124 pub fn file_data_len_not_equal_to(&self, other_len: u64) -> bool {
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125 // Relevant code that implement this behavior in Python code:
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126 // basefilectx.cmp, filelog.size, storageutil.filerevisioncopied,
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127 // revlog.size, revlog.rawsize
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128
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129 // Let’s call `file_data_len` what would be returned by
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130 // `self.data().file_data().len()`.
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131
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132 if self.0.is_censored() {
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133 let file_data_len = 0;
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134 return other_len != file_data_len;
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135 }
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136
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137 if self.0.has_length_affecting_flag_processor() {
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138 // We can’t conclude anything about `file_data_len`.
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139 return false;
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140 }
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141
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142 // Revlog revisions (usually) have metadata for the size of
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143 // their data after decompression and delta resolution
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144 // as would be returned by `Revlog::get_rev_data`.
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145 //
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146 // For filelogs this is the file’s contents preceded by an optional
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147 // metadata block.
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148 let uncompressed_len = if let Some(l) = self.0.uncompressed_len() {
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149 l as u64
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150 } else {
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151 // The field was set to -1, the actual uncompressed len is unknown.
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152 // We need to decompress to say more.
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153 return false;
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154 };
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155 // `uncompressed_len = file_data_len + optional_metadata_len`,
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156 // so `file_data_len <= uncompressed_len`.
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157 if uncompressed_len < other_len {
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158 // Transitively, `file_data_len < other_len`.
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159 // So `other_len != file_data_len` definitely.
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160 return true;
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161 }
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162
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163 if uncompressed_len == other_len + 4 {
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164 // It’s possible that `file_data_len == other_len` with an empty
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165 // metadata block (2 start marker bytes + 2 end marker bytes).
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166 // This happens when there wouldn’t otherwise be metadata, but
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167 // the first 2 bytes of file data happen to match a start marker
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168 // and would be ambiguous.
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169 return false;
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170 }
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171
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172 if !self.0.has_p1() {
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173 // There may or may not be copy metadata, so we can’t deduce more
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174 // about `file_data_len` without computing file data.
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175 return false;
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176 }
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177
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178 // Filelog ancestry is not meaningful in the way changelog ancestry is.
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179 // It only provides hints to delta generation.
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180 // p1 and p2 are set to null when making a copy or rename since
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181 // contents are likely unrelatedto what might have previously existed
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182 // at the destination path.
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183 //
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184 // Conversely, since here p1 is non-null, there is no copy metadata.
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185 // Note that this reasoning may be invalidated in the presence of
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186 // merges made by some previous versions of Mercurial that
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187 // swapped p1 and p2. See <https://bz.mercurial-scm.org/show_bug.cgi?id=6528>
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188 // and `tests/test-issue6528.t`.
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189 //
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190 // Since copy metadata is currently the only kind of metadata
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191 // kept in revlog data of filelogs,
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192 // this `FilelogEntry` does not have such metadata:
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193 let file_data_len = uncompressed_len;
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194
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195 file_data_len != other_len
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196 }
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197
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198 pub fn data(&self) -> Result<FilelogRevisionData, HgError> {
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199 let data = self.0.data();
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200 match data {
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201 Ok(data) => Ok(FilelogRevisionData(data.into_owned())),
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202 // Errors other than `HgError` should not happen at this point
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203 Err(e) => match e {
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204 RevlogError::Other(hg_error) => Err(hg_error),
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205 revlog_error => Err(HgError::abort(
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206 revlog_error.to_string(),
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diff changeset
207 exit_codes::ABORT,
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208 None,
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209 )),
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210 },
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211 }
48542
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212 }
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213 }
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214
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215 /// The data for one revision in a filelog, uncompressed and delta-resolved.
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216 pub struct FilelogRevisionData(Vec<u8>);
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parents:
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217
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diff changeset
218 impl FilelogRevisionData {
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219 /// Split into metadata and data
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diff changeset
220 pub fn split(
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221 &self,
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diff changeset
222 ) -> Result<(FilelogRevisionMetadata<'_>, &[u8]), HgError> {
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parents: 52290
diff changeset
223 const DELIMITER: &[u8; 2] = b"\x01\n";
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224
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diff changeset
225 if let Some(rest) = self.0.drop_prefix(DELIMITER) {
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226 if let Some((metadata, data)) = rest.split_2_by_slice(DELIMITER) {
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diff changeset
227 Ok((FilelogRevisionMetadata(Some(metadata)), data))
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parents:
diff changeset
228 } else {
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diff changeset
229 Err(HgError::corrupted(
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diff changeset
230 "Missing metadata end delimiter in filelog entry",
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parents:
diff changeset
231 ))
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diff changeset
232 }
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233 } else {
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diff changeset
234 Ok((FilelogRevisionMetadata(None), &self.0))
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diff changeset
235 }
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diff changeset
236 }
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237
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238 /// Returns the metadata header.
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239 pub fn metadata(&self) -> Result<FilelogRevisionMetadata<'_>, HgError> {
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diff changeset
240 let (metadata, _data) = self.split()?;
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241 Ok(metadata)
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242 }
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243
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244 /// Returns the file contents at this revision, stripped of any metadata
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245 pub fn file_data(&self) -> Result<&[u8], HgError> {
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246 let (_metadata, data) = self.split()?;
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247 Ok(data)
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248 }
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249
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250 /// Consume the entry, and convert it into data, discarding any metadata,
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251 /// if present.
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252 pub fn into_file_data(self) -> Result<Vec<u8>, HgError> {
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253 if let (FilelogRevisionMetadata(Some(_)), data) = self.split()? {
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254 Ok(data.to_owned())
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255 } else {
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256 Ok(self.0)
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257 }
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258 }
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259 }
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260
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261 /// The optional metadata header included in [`FilelogRevisionData`].
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262 pub struct FilelogRevisionMetadata<'a>(Option<&'a [u8]>);
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263
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264 /// Fields parsed from [`FilelogRevisionMetadata`].
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265 #[derive(Debug, PartialEq, Default)]
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266 pub struct FilelogRevisionMetadataFields<'a> {
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267 /// True if the file revision data is censored.
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268 pub censored: bool,
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269 /// Path of the copy source.
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270 pub copy: Option<&'a HgPath>,
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271 /// Filelog node ID of the copy source.
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272 pub copyrev: Option<Node>,
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273 }
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274
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275 impl<'a> FilelogRevisionMetadata<'a> {
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276 /// Parses the metadata fields.
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277 pub fn parse(self) -> Result<FilelogRevisionMetadataFields<'a>, HgError> {
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278 let mut fields = FilelogRevisionMetadataFields::default();
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279 if let Some(metadata) = self.0 {
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280 let mut rest = metadata;
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281 while !rest.is_empty() {
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282 let Some(colon_idx) = memchr::memchr(b':', rest) else {
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283 return Err(HgError::corrupted(
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284 "File metadata header line missing colon",
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285 ));
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286 };
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287 if rest.get(colon_idx + 1) != Some(&b' ') {
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288 return Err(HgError::corrupted(
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289 "File metadata header line missing space",
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290 ));
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291 }
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292 let key = &rest[..colon_idx];
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293 rest = &rest[colon_idx + 2..];
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294 let Some(newline_idx) = memchr::memchr(b'\n', rest) else {
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295 return Err(HgError::corrupted(
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296 "File metadata header line missing newline",
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297 ));
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298 };
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299 let value = &rest[..newline_idx];
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300 match key {
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301 b"censored" => {
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302 match value {
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303 b"" => fields.censored = true,
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304 _ => return Err(HgError::corrupted(
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305 "File metadata header 'censored' field has nonempty value",
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diff changeset
306 )),
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307 }
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308 }
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309 b"copy" => fields.copy = Some(HgPath::new(value)),
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310 b"copyrev" => {
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311 fields.copyrev = Some(Node::from_hex_for_repo(value)?)
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312 }
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313 _ => {
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314 return Err(HgError::corrupted(
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315 format!(
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316 "File metadata header has unrecognized key '{}'",
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317 String::from_utf8_lossy(key),
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318 ),
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319 ))
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320 }
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321 }
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322 rest = &rest[newline_idx + 1..];
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323 }
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324 }
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325 Ok(fields)
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326 }
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327 }
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328
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329 #[cfg(test)]
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330 mod tests {
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331 use super::*;
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332 use format_bytes::format_bytes;
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333
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334 #[test]
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335 fn test_parse_no_metadata() {
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336 let data = FilelogRevisionData(b"data".to_vec());
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337 let fields = data.metadata().unwrap().parse().unwrap();
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338 assert_eq!(fields, Default::default());
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339 }
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340
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341 #[test]
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342 fn test_parse_empty_metadata() {
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343 let data = FilelogRevisionData(b"\x01\n\x01\ndata".to_vec());
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344 let fields = data.metadata().unwrap().parse().unwrap();
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345 assert_eq!(fields, Default::default());
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346 }
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347
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348 #[test]
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349 fn test_parse_one_field() {
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350 let data =
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351 FilelogRevisionData(b"\x01\ncopy: foo\n\x01\ndata".to_vec());
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352 let fields = data.metadata().unwrap().parse().unwrap();
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353 assert_eq!(
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354 fields,
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355 FilelogRevisionMetadataFields {
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356 copy: Some(HgPath::new("foo")),
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357 ..Default::default()
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358 }
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359 );
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360 }
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361
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362 #[test]
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363 fn test_parse_all_fields() {
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364 let sha = b"215d5d1546f82a79481eb2df513a7bc341bdf17f";
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365 let data = FilelogRevisionData(format_bytes!(
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366 b"\x01\ncensored: \ncopy: foo\ncopyrev: {}\n\x01\ndata",
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367 sha
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368 ));
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369 let fields = data.metadata().unwrap().parse().unwrap();
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370 assert_eq!(
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371 fields,
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372 FilelogRevisionMetadataFields {
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373 censored: true,
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374 copy: Some(HgPath::new("foo")),
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diff changeset
375 copyrev: Some(Node::from_hex(sha).unwrap()),
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parents: 52291
diff changeset
376 }
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parents: 52291
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377 );
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378 }
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379
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380 #[test]
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381 fn test_parse_invalid_metadata() {
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382 let data =
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383 FilelogRevisionData(b"\x01\nbad: value\n\x01\ndata".to_vec());
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384 let err = data.metadata().unwrap().parse().unwrap_err();
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385 assert!(err.to_string().contains("unrecognized key 'bad'"));
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386 }
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387 }