annotate rust/hg-core/src/dirstate.rs @ 47890:3853e6ee160d

dirstatemap: replace `removefile` by an explicit `entry.set_untracked()` All the other caller goes through `reset_state`, so we can safely have an explicit method on `DirstateItem` object. This means that all the logic to preserve the previous state (from p2, merged, etc) is now properly encapsulated within the DirstateItem. This pave the way to using different storage for these information. Differential Revision: https://phab.mercurial-scm.org/D11315
author Pierre-Yves David <pierre-yves.david@octobus.net>
date Fri, 20 Aug 2021 11:27:01 +0200
parents 284a20269a97
children 81aedf1fc897
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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 /// Returns a `(state, mode, size, mtime)` tuple as for
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70 /// `DirstateMapMethods::debug_iter`.
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71 pub fn debug_tuple(&self) -> (u8, i32, i32, i32) {
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72 (self.state.into(), self.mode, self.size, self.mtime)
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73 }
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74 }
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75
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76 #[derive(BytesCast)]
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77 #[repr(C)]
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78 struct RawEntry {
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79 state: u8,
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80 mode: unaligned::I32Be,
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81 size: unaligned::I32Be,
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82 mtime: unaligned::I32Be,
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83 length: unaligned::I32Be,
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84 }
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85
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86 pub const V1_RANGEMASK: i32 = 0x7FFFFFFF;
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87
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88 pub const MTIME_UNSET: i32 = -1;
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89
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90 /// A `DirstateEntry` with a size of `-2` means that it was merged from the
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91 /// other parent. This allows revert to pick the right status back during a
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92 /// merge.
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93 pub const SIZE_FROM_OTHER_PARENT: i32 = -2;
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94 /// A special value used for internal representation of special case in
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95 /// dirstate v1 format.
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96 pub const SIZE_NON_NORMAL: i32 = -1;
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97
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98 pub type StateMap = FastHashMap<HgPathBuf, DirstateEntry>;
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99 pub type StateMapIter<'a> = Box<
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100 dyn Iterator<
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101 Item = Result<(&'a HgPath, DirstateEntry), DirstateV2ParseError>,
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102 > + Send
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103 + 'a,
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104 >;
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105
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106 pub type CopyMap = FastHashMap<HgPathBuf, HgPathBuf>;
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107 pub type CopyMapIter<'a> = Box<
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108 dyn Iterator<Item = Result<(&'a HgPath, &'a HgPath), DirstateV2ParseError>>
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109 + Send
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110 + 'a,
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111 >;
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112
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113 #[derive(Copy, Clone, Debug, Eq, PartialEq)]
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114 pub enum EntryState {
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115 Normal,
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116 Added,
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117 Removed,
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118 Merged,
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119 Unknown,
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120 }
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121
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122 impl EntryState {
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123 pub fn is_tracked(self) -> bool {
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124 use EntryState::*;
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125 match self {
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126 Normal | Added | Merged => true,
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127 Removed | Unknown => false,
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128 }
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129 }
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130 }
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131
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132 impl TryFrom<u8> for EntryState {
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133 type Error = HgError;
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134
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135 fn try_from(value: u8) -> Result<Self, Self::Error> {
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136 match value {
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137 b'n' => Ok(EntryState::Normal),
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138 b'a' => Ok(EntryState::Added),
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139 b'r' => Ok(EntryState::Removed),
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140 b'm' => Ok(EntryState::Merged),
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141 b'?' => Ok(EntryState::Unknown),
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142 _ => Err(HgError::CorruptedRepository(format!(
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143 "Incorrect dirstate entry state {}",
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144 value
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145 ))),
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146 }
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147 }
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148 }
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149
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150 impl Into<u8> for EntryState {
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151 fn into(self) -> u8 {
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152 match self {
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153 EntryState::Normal => b'n',
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154 EntryState::Added => b'a',
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155 EntryState::Removed => b'r',
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156 EntryState::Merged => b'm',
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157 EntryState::Unknown => b'?',
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158 }
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159 }
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160 }