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annotate rust/hg-core/src/dirstate.rs @ 47408:f7f082bc0e7c

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revlog: allow to pass an existing docket to `_loadindex()` This will be when switching undelying files, for examples during censors and strip operation with rvlog-v2. Differential Revision: https://phab.mercurial-scm.org/D10800
author Pierre-Yves David <pierre-yves.david@octobus.net>
date Sun, 30 May 2021 18:09:29 +0200
parents bd88b6bfd8da
children eaae39894312
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1 // dirstate module
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2 //
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3 // Copyright 2019 Raphaël Gomès <rgomes@octobus.net>
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4 //
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5 // This software may be used and distributed according to the terms of the
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6 // GNU General Public License version 2 or any later version.
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7
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8 use crate::dirstate_tree::on_disk::DirstateV2ParseError;
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9 use crate::errors::HgError;
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10 use crate::revlog::node::NULL_NODE;
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11 use crate::revlog::Node;
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12 use crate::utils::hg_path::{HgPath, HgPathBuf};
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13 use crate::FastHashMap;
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14 use bytes_cast::{unaligned, BytesCast};
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15 use std::convert::TryFrom;
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16
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17 pub mod dirs_multiset;
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18 pub mod dirstate_map;
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19 pub mod parsers;
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20 pub mod status;
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21
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22 #[derive(Debug, PartialEq, Clone, BytesCast)]
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23 #[repr(C)]
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24 pub struct DirstateParents {
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25 pub p1: Node,
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26 pub p2: Node,
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27 }
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28
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29 impl DirstateParents {
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30 pub const NULL: Self = Self {
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31 p1: NULL_NODE,
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32 p2: NULL_NODE,
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33 };
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34 }
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35
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36 /// The C implementation uses all signed types. This will be an issue
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37 /// either when 4GB+ source files are commonplace or in 2038, whichever
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38 /// comes first.
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39 #[derive(Debug, PartialEq, Copy, Clone)]
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40 pub struct DirstateEntry {
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41 pub state: EntryState,
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42 pub mode: i32,
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43 pub mtime: i32,
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44 pub size: i32,
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45 }
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46
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47 impl DirstateEntry {
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48 pub fn is_non_normal(&self) -> bool {
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49 self.state != EntryState::Normal || self.mtime == MTIME_UNSET
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50 }
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51
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52 pub fn is_from_other_parent(&self) -> bool {
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53 self.state == EntryState::Normal && self.size == SIZE_FROM_OTHER_PARENT
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54 }
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55
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56 // TODO: other platforms
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57 #[cfg(unix)]
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58 pub fn mode_changed(
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59 &self,
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60 filesystem_metadata: &std::fs::Metadata,
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61 ) -> bool {
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62 use std::os::unix::fs::MetadataExt;
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63 const EXEC_BIT_MASK: u32 = 0o100;
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64 let dirstate_exec_bit = (self.mode as u32) & EXEC_BIT_MASK;
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65 let fs_exec_bit = filesystem_metadata.mode() & EXEC_BIT_MASK;
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66 dirstate_exec_bit != fs_exec_bit
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67 }
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68 }
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69
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70 #[derive(BytesCast)]
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71 #[repr(C)]
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72 struct RawEntry {
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73 state: u8,
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74 mode: unaligned::I32Be,
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75 size: unaligned::I32Be,
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76 mtime: unaligned::I32Be,
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77 length: unaligned::I32Be,
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78 }
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79
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80 const MTIME_UNSET: i32 = -1;
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81
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82 /// A `DirstateEntry` with a size of `-2` means that it was merged from the
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83 /// other parent. This allows revert to pick the right status back during a
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84 /// merge.
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85 pub const SIZE_FROM_OTHER_PARENT: i32 = -2;
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86
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87 pub type StateMap = FastHashMap<HgPathBuf, DirstateEntry>;
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88 pub type StateMapIter<'a> = Box<
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89 dyn Iterator<
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90 Item = Result<(&'a HgPath, DirstateEntry), DirstateV2ParseError>,
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91 > + Send
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92 + 'a,
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93 >;
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94
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95 pub type CopyMap = FastHashMap<HgPathBuf, HgPathBuf>;
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96 pub type CopyMapIter<'a> = Box<
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97 dyn Iterator<Item = Result<(&'a HgPath, &'a HgPath), DirstateV2ParseError>>
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98 + Send
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99 + 'a,
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100 >;
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101
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102 #[derive(Copy, Clone, Debug, Eq, PartialEq)]
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103 pub enum EntryState {
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104 Normal,
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105 Added,
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106 Removed,
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107 Merged,
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108 Unknown,
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109 }
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110
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111 impl EntryState {
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112 pub fn is_tracked(self) -> bool {
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113 use EntryState::*;
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114 match self {
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115 Normal | Added | Merged => true,
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116 Removed | Unknown => false,
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117 }
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118 }
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119 }
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120
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121 impl TryFrom<u8> for EntryState {
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122 type Error = HgError;
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123
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124 fn try_from(value: u8) -> Result<Self, Self::Error> {
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125 match value {
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126 b'n' => Ok(EntryState::Normal),
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127 b'a' => Ok(EntryState::Added),
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128 b'r' => Ok(EntryState::Removed),
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129 b'm' => Ok(EntryState::Merged),
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130 b'?' => Ok(EntryState::Unknown),
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131 _ => Err(HgError::CorruptedRepository(format!(
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132 "Incorrect dirstate entry state {}",
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133 value
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134 ))),
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135 }
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136 }
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137 }
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138
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139 impl Into<u8> for EntryState {
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140 fn into(self) -> u8 {
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141 match self {
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142 EntryState::Normal => b'n',
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143 EntryState::Added => b'a',
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144 EntryState::Removed => b'r',
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145 EntryState::Merged => b'm',
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146 EntryState::Unknown => b'?',
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147 }
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148 }
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149 }