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annotate rust/hg-core/src/dirstate.rs @ 47350:04d1f17f49e7

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dirstate-v2: Write .hg/dirstate back to disk on directory cache changes Differential Revision: https://phab.mercurial-scm.org/D10827
author Simon Sapin <simon.sapin@octobus.net>
date Mon, 31 May 2021 18:35:44 +0200
parents ed1583a845d2
children bd88b6bfd8da
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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;
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11 use crate::utils::hg_path::{HgPath, HgPathBuf};
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12 use crate::FastHashMap;
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13 use bytes_cast::{unaligned, BytesCast};
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14 use std::convert::TryFrom;
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15
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16 pub mod dirs_multiset;
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17 pub mod dirstate_map;
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18 pub mod parsers;
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19 pub mod status;
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20
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21 #[derive(Debug, PartialEq, Clone, BytesCast)]
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22 #[repr(C)]
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23 pub struct DirstateParents {
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24 pub p1: Node,
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25 pub p2: Node,
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26 }
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27
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28 /// The C implementation uses all signed types. This will be an issue
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29 /// either when 4GB+ source files are commonplace or in 2038, whichever
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30 /// comes first.
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31 #[derive(Debug, PartialEq, Copy, Clone)]
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32 pub struct DirstateEntry {
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33 pub state: EntryState,
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34 pub mode: i32,
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35 pub mtime: i32,
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36 pub size: i32,
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37 }
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38
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39 impl DirstateEntry {
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40 pub fn is_non_normal(&self) -> bool {
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41 self.state != EntryState::Normal || self.mtime == MTIME_UNSET
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42 }
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43
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44 pub fn is_from_other_parent(&self) -> bool {
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45 self.state == EntryState::Normal && self.size == SIZE_FROM_OTHER_PARENT
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46 }
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47
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48 // TODO: other platforms
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49 #[cfg(unix)]
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50 pub fn mode_changed(
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51 &self,
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52 filesystem_metadata: &std::fs::Metadata,
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53 ) -> bool {
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54 use std::os::unix::fs::MetadataExt;
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55 const EXEC_BIT_MASK: u32 = 0o100;
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56 let dirstate_exec_bit = (self.mode as u32) & EXEC_BIT_MASK;
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57 let fs_exec_bit = filesystem_metadata.mode() & EXEC_BIT_MASK;
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58 dirstate_exec_bit != fs_exec_bit
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59 }
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60 }
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61
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62 #[derive(BytesCast)]
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63 #[repr(C)]
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64 struct RawEntry {
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65 state: u8,
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66 mode: unaligned::I32Be,
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67 size: unaligned::I32Be,
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68 mtime: unaligned::I32Be,
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69 length: unaligned::I32Be,
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70 }
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71
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72 const MTIME_UNSET: i32 = -1;
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73
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74 /// A `DirstateEntry` with a size of `-2` means that it was merged from the
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75 /// other parent. This allows revert to pick the right status back during a
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76 /// merge.
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77 pub const SIZE_FROM_OTHER_PARENT: i32 = -2;
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78
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79 pub type StateMap = FastHashMap<HgPathBuf, DirstateEntry>;
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80 pub type StateMapIter<'a> = Box<
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81 dyn Iterator<
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82 Item = Result<(&'a HgPath, DirstateEntry), DirstateV2ParseError>,
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83 > + Send
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84 + 'a,
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85 >;
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86
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87 pub type CopyMap = FastHashMap<HgPathBuf, HgPathBuf>;
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88 pub type CopyMapIter<'a> = Box<
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89 dyn Iterator<Item = Result<(&'a HgPath, &'a HgPath), DirstateV2ParseError>>
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90 + Send
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91 + 'a,
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92 >;
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93
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94 #[derive(Copy, Clone, Debug, Eq, PartialEq)]
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95 pub enum EntryState {
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96 Normal,
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97 Added,
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98 Removed,
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99 Merged,
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100 Unknown,
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101 }
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102
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103 impl EntryState {
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104 pub fn is_tracked(self) -> bool {
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105 use EntryState::*;
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106 match self {
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107 Normal | Added | Merged => true,
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108 Removed | Unknown => false,
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109 }
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110 }
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111 }
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112
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113 impl TryFrom<u8> for EntryState {
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114 type Error = HgError;
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115
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116 fn try_from(value: u8) -> Result<Self, Self::Error> {
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117 match value {
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118 b'n' => Ok(EntryState::Normal),
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119 b'a' => Ok(EntryState::Added),
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120 b'r' => Ok(EntryState::Removed),
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121 b'm' => Ok(EntryState::Merged),
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122 b'?' => Ok(EntryState::Unknown),
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776b97179c06 rust: Remove DirstateParseError and ListDirstateTrackedFilesError
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123 _ => Err(HgError::CorruptedRepository(format!(
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124 "Incorrect dirstate entry state {}",
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125 value
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126 ))),
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127 }
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128 }
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129 }
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130
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131 impl Into<u8> for EntryState {
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132 fn into(self) -> u8 {
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133 match self {
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134 EntryState::Normal => b'n',
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135 EntryState::Added => b'a',
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parents: 42748
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136 EntryState::Removed => b'r',
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parents: 42748
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137 EntryState::Merged => b'm',
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parents: 42748
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138 EntryState::Unknown => b'?',
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139 }
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140 }
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141 }