Mercurial > hg
annotate rust/hg-core/src/dirstate/entry.rs @ 48193:320de901896a
dirstate-v2: Truncate directory mtimes to 31 bits of seconds
… instead of 64 bits, while keeping the sub-second presision.
This brings the size of one timestamp from 12 bytes to 8 bytes.
31 bits is chosen instead of 32 because that’s already what happens for the
mtime of files and symlinks, because dirstate-v1 uses negative i32 values as
markers.
Later we’ll add sub-second precision for file/symlink mtimes, making their
dirstate-v2 representation the same as for directories.
Differential Revision: https://phab.mercurial-scm.org/D11633
author | Simon Sapin <simon.sapin@octobus.net> |
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date | Tue, 12 Oct 2021 16:38:13 +0200 |
parents | d2f760c2c91c |
children | 1000db4a71f1 |
rev | line source |
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1 use crate::dirstate_tree::on_disk::DirstateV2ParseError; |
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2 use crate::errors::HgError; |
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3 use bitflags::bitflags; |
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4 use std::convert::TryFrom; |
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5 use std::time::{SystemTime, UNIX_EPOCH}; |
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6 |
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7 #[derive(Copy, Clone, Debug, Eq, PartialEq)] |
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8 pub enum EntryState { |
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9 Normal, |
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10 Added, |
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11 Removed, |
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12 Merged, |
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13 } |
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14 |
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15 /// The C implementation uses all signed types. This will be an issue |
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16 /// either when 4GB+ source files are commonplace or in 2038, whichever |
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17 /// comes first. |
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18 #[derive(Debug, PartialEq, Copy, Clone)] |
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19 pub struct DirstateEntry { |
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20 pub(crate) flags: Flags, |
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21 mode_size: Option<(i32, i32)>, |
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22 mtime: Option<i32>, |
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23 } |
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24 |
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25 bitflags! { |
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26 pub(crate) struct Flags: u8 { |
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27 const WDIR_TRACKED = 1 << 0; |
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28 const P1_TRACKED = 1 << 1; |
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29 const P2_INFO = 1 << 2; |
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30 } |
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31 } |
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32 |
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33 /// A Unix timestamp with nanoseconds precision |
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34 #[derive(Copy, Clone)] |
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35 pub struct TruncatedTimestamp { |
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36 truncated_seconds: u32, |
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37 /// Always in the `0 .. 1_000_000_000` range. |
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38 nanoseconds: u32, |
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39 } |
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40 |
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41 impl TruncatedTimestamp { |
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42 /// Constructs from a timestamp potentially outside of the supported range, |
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43 /// and truncate the seconds components to its lower 31 bits. |
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44 /// |
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45 /// Panics if the nanoseconds components is not in the expected range. |
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46 pub fn new_truncate(seconds: i64, nanoseconds: u32) -> Self { |
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47 assert!(nanoseconds < NSEC_PER_SEC); |
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48 Self { |
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49 truncated_seconds: seconds as u32 & RANGE_MASK_31BIT, |
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50 nanoseconds, |
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51 } |
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52 } |
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53 |
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54 /// Construct from components. Returns an error if they are not in the |
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55 /// expcted range. |
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56 pub fn from_already_truncated( |
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57 truncated_seconds: u32, |
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58 nanoseconds: u32, |
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59 ) -> Result<Self, DirstateV2ParseError> { |
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60 if truncated_seconds & !RANGE_MASK_31BIT == 0 |
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61 && nanoseconds < NSEC_PER_SEC |
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62 { |
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63 Ok(Self { |
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64 truncated_seconds, |
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65 nanoseconds, |
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66 }) |
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67 } else { |
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68 Err(DirstateV2ParseError) |
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69 } |
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70 } |
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71 |
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72 /// The lower 31 bits of the number of seconds since the epoch. |
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73 pub fn truncated_seconds(&self) -> u32 { |
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74 self.truncated_seconds |
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75 } |
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76 |
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77 /// The sub-second component of this timestamp, in nanoseconds. |
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78 /// Always in the `0 .. 1_000_000_000` range. |
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79 /// |
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80 /// This timestamp is after `(seconds, 0)` by this many nanoseconds. |
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81 pub fn nanoseconds(&self) -> u32 { |
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82 self.nanoseconds |
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83 } |
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84 |
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85 /// Returns whether two timestamps are equal modulo 2**31 seconds. |
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86 /// |
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87 /// If this returns `true`, the original values converted from `SystemTime` |
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88 /// or given to `new_truncate` were very likely equal. A false positive is |
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89 /// possible if they were exactly a multiple of 2**31 seconds apart (around |
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90 /// 68 years). This is deemed very unlikely to happen by chance, especially |
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91 /// on filesystems that support sub-second precision. |
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92 /// |
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93 /// If someone is manipulating the modification times of some files to |
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94 /// intentionally make `hg status` return incorrect results, not truncating |
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95 /// wouldn’t help much since they can set exactly the expected timestamp. |
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96 pub fn very_likely_equal(&self, other: &Self) -> bool { |
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97 self.truncated_seconds == other.truncated_seconds |
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98 && self.nanoseconds == other.nanoseconds |
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99 } |
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100 } |
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101 |
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102 impl From<SystemTime> for TruncatedTimestamp { |
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103 fn from(system_time: SystemTime) -> Self { |
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104 // On Unix, `SystemTime` is a wrapper for the `timespec` C struct: |
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105 // https://www.gnu.org/software/libc/manual/html_node/Time-Types.html#index-struct-timespec |
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106 // We want to effectively access its fields, but the Rust standard |
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107 // library does not expose them. The best we can do is: |
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108 let seconds; |
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109 let nanoseconds; |
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110 match system_time.duration_since(UNIX_EPOCH) { |
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111 Ok(duration) => { |
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112 seconds = duration.as_secs() as i64; |
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113 nanoseconds = duration.subsec_nanos(); |
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114 } |
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115 Err(error) => { |
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116 // `system_time` is before `UNIX_EPOCH`. |
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117 // We need to undo this algorithm: |
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118 // https://github.com/rust-lang/rust/blob/6bed1f0bc3cc50c10aab26d5f94b16a00776b8a5/library/std/src/sys/unix/time.rs#L40-L41 |
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119 let negative = error.duration(); |
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120 let negative_secs = negative.as_secs() as i64; |
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121 let negative_nanos = negative.subsec_nanos(); |
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122 if negative_nanos == 0 { |
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123 seconds = -negative_secs; |
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124 nanoseconds = 0; |
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125 } else { |
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126 // For example if `system_time` was 4.3 seconds before |
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127 // the Unix epoch we get a Duration that represents |
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128 // `(-4, -0.3)` but we want `(-5, +0.7)`: |
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129 seconds = -1 - negative_secs; |
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130 nanoseconds = NSEC_PER_SEC - negative_nanos; |
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131 } |
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132 } |
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133 }; |
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134 Self::new_truncate(seconds, nanoseconds) |
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135 } |
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136 } |
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137 |
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138 const NSEC_PER_SEC: u32 = 1_000_000_000; |
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139 const RANGE_MASK_31BIT: u32 = 0x7FFF_FFFF; |
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140 |
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141 pub const MTIME_UNSET: i32 = -1; |
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142 |
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143 /// A `DirstateEntry` with a size of `-2` means that it was merged from the |
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144 /// other parent. This allows revert to pick the right status back during a |
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145 /// merge. |
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146 pub const SIZE_FROM_OTHER_PARENT: i32 = -2; |
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147 /// A special value used for internal representation of special case in |
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148 /// dirstate v1 format. |
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149 pub const SIZE_NON_NORMAL: i32 = -1; |
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150 |
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151 impl DirstateEntry { |
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152 pub fn from_v2_data( |
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153 wdir_tracked: bool, |
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154 p1_tracked: bool, |
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155 p2_info: bool, |
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156 mode_size: Option<(i32, i32)>, |
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157 mtime: Option<i32>, |
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158 ) -> Self { |
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159 let mut flags = Flags::empty(); |
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160 flags.set(Flags::WDIR_TRACKED, wdir_tracked); |
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161 flags.set(Flags::P1_TRACKED, p1_tracked); |
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162 flags.set(Flags::P2_INFO, p2_info); |
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163 Self { |
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164 flags, |
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165 mode_size, |
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166 mtime, |
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167 } |
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168 } |
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169 |
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170 pub fn from_v1_data( |
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171 state: EntryState, |
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172 mode: i32, |
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173 size: i32, |
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174 mtime: i32, |
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175 ) -> Self { |
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176 match state { |
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177 EntryState::Normal => { |
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178 if size == SIZE_FROM_OTHER_PARENT { |
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179 Self { |
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180 // might be missing P1_TRACKED |
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181 flags: Flags::WDIR_TRACKED | Flags::P2_INFO, |
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182 mode_size: None, |
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183 mtime: None, |
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184 } |
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185 } else if size == SIZE_NON_NORMAL { |
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186 Self { |
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187 flags: Flags::WDIR_TRACKED | Flags::P1_TRACKED, |
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188 mode_size: None, |
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189 mtime: None, |
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190 } |
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191 } else if mtime == MTIME_UNSET { |
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192 Self { |
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193 flags: Flags::WDIR_TRACKED | Flags::P1_TRACKED, |
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194 mode_size: Some((mode, size)), |
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195 mtime: None, |
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196 } |
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197 } else { |
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198 Self { |
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199 flags: Flags::WDIR_TRACKED | Flags::P1_TRACKED, |
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200 mode_size: Some((mode, size)), |
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201 mtime: Some(mtime), |
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202 } |
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203 } |
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204 } |
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205 EntryState::Added => Self { |
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206 flags: Flags::WDIR_TRACKED, |
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207 mode_size: None, |
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208 mtime: None, |
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209 }, |
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210 EntryState::Removed => Self { |
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211 flags: if size == SIZE_NON_NORMAL { |
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212 Flags::P1_TRACKED | Flags::P2_INFO |
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213 } else if size == SIZE_FROM_OTHER_PARENT { |
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214 // We don’t know if P1_TRACKED should be set (file history) |
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215 Flags::P2_INFO |
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216 } else { |
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217 Flags::P1_TRACKED |
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218 }, |
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219 mode_size: None, |
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220 mtime: None, |
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221 }, |
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222 EntryState::Merged => Self { |
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223 flags: Flags::WDIR_TRACKED |
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224 | Flags::P1_TRACKED // might not be true because of rename ? |
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225 | Flags::P2_INFO, // might not be true because of rename ? |
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226 mode_size: None, |
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227 mtime: None, |
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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 /// Creates a new entry in "removed" state. |
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233 /// |
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234 /// `size` is expected to be zero, `SIZE_NON_NORMAL`, or |
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235 /// `SIZE_FROM_OTHER_PARENT` |
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236 pub fn new_removed(size: i32) -> Self { |
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237 Self::from_v1_data(EntryState::Removed, 0, size, 0) |
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238 } |
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239 |
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240 pub fn tracked(&self) -> bool { |
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241 self.flags.contains(Flags::WDIR_TRACKED) |
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242 } |
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243 |
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244 pub fn p1_tracked(&self) -> bool { |
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245 self.flags.contains(Flags::P1_TRACKED) |
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246 } |
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247 |
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248 fn in_either_parent(&self) -> bool { |
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249 self.flags.intersects(Flags::P1_TRACKED | Flags::P2_INFO) |
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250 } |
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251 |
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252 pub fn removed(&self) -> bool { |
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253 self.in_either_parent() && !self.flags.contains(Flags::WDIR_TRACKED) |
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254 } |
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255 |
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256 pub fn p2_info(&self) -> bool { |
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257 self.flags.contains(Flags::WDIR_TRACKED | Flags::P2_INFO) |
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258 } |
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259 |
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260 pub fn added(&self) -> bool { |
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261 self.flags.contains(Flags::WDIR_TRACKED) && !self.in_either_parent() |
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262 } |
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263 |
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264 pub fn maybe_clean(&self) -> bool { |
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265 if !self.flags.contains(Flags::WDIR_TRACKED) { |
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266 false |
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267 } else if !self.flags.contains(Flags::P1_TRACKED) { |
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268 false |
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269 } else if self.flags.contains(Flags::P2_INFO) { |
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270 false |
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271 } else { |
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272 true |
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273 } |
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274 } |
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275 |
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276 pub fn any_tracked(&self) -> bool { |
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277 self.flags.intersects( |
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278 Flags::WDIR_TRACKED | Flags::P1_TRACKED | Flags::P2_INFO, |
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279 ) |
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280 } |
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281 |
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282 /// Returns `(wdir_tracked, p1_tracked, p2_info, mode_size, mtime)` |
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283 pub(crate) fn v2_data( |
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284 &self, |
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285 ) -> (bool, bool, bool, Option<(i32, i32)>, Option<i32>) { |
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286 if !self.any_tracked() { |
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287 // TODO: return an Option instead? |
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288 panic!("Accessing v1_state of an untracked DirstateEntry") |
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289 } |
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290 let wdir_tracked = self.flags.contains(Flags::WDIR_TRACKED); |
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291 let p1_tracked = self.flags.contains(Flags::P1_TRACKED); |
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292 let p2_info = self.flags.contains(Flags::P2_INFO); |
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293 let mode_size = self.mode_size; |
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294 let mtime = self.mtime; |
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295 (wdir_tracked, p1_tracked, p2_info, mode_size, mtime) |
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296 } |
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297 |
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298 fn v1_state(&self) -> EntryState { |
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299 if !self.any_tracked() { |
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300 // TODO: return an Option instead? |
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301 panic!("Accessing v1_state of an untracked DirstateEntry") |
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302 } |
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303 if self.removed() { |
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304 EntryState::Removed |
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305 } else if self |
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306 .flags |
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307 .contains(Flags::WDIR_TRACKED | Flags::P1_TRACKED | Flags::P2_INFO) |
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308 { |
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309 EntryState::Merged |
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310 } else if self.added() { |
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311 EntryState::Added |
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312 } else { |
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313 EntryState::Normal |
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314 } |
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315 } |
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316 |
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317 fn v1_mode(&self) -> i32 { |
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318 if let Some((mode, _size)) = self.mode_size { |
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319 mode |
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320 } else { |
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321 0 |
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322 } |
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323 } |
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324 |
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325 fn v1_size(&self) -> i32 { |
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326 if !self.any_tracked() { |
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327 // TODO: return an Option instead? |
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328 panic!("Accessing v1_size of an untracked DirstateEntry") |
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329 } |
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330 if self.removed() |
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331 && self.flags.contains(Flags::P1_TRACKED | Flags::P2_INFO) |
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332 { |
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333 SIZE_NON_NORMAL |
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334 } else if self.flags.contains(Flags::P2_INFO) { |
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335 SIZE_FROM_OTHER_PARENT |
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336 } else if self.removed() { |
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337 0 |
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338 } else if self.added() { |
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339 SIZE_NON_NORMAL |
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340 } else if let Some((_mode, size)) = self.mode_size { |
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341 size |
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342 } else { |
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343 SIZE_NON_NORMAL |
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344 } |
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345 } |
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346 |
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347 fn v1_mtime(&self) -> i32 { |
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348 if !self.any_tracked() { |
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349 // TODO: return an Option instead? |
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350 panic!("Accessing v1_mtime of an untracked DirstateEntry") |
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351 } |
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352 if self.removed() { |
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353 0 |
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354 } else if self.flags.contains(Flags::P2_INFO) { |
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355 MTIME_UNSET |
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356 } else if !self.flags.contains(Flags::P1_TRACKED) { |
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357 MTIME_UNSET |
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358 } else { |
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359 self.mtime.unwrap_or(MTIME_UNSET) |
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360 } |
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361 } |
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362 |
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363 // TODO: return `Option<EntryState>`? None when `!self.any_tracked` |
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364 pub fn state(&self) -> EntryState { |
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365 self.v1_state() |
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366 } |
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367 |
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368 // TODO: return Option? |
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369 pub fn mode(&self) -> i32 { |
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370 self.v1_mode() |
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371 } |
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372 |
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373 // TODO: return Option? |
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374 pub fn size(&self) -> i32 { |
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375 self.v1_size() |
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376 } |
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377 |
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378 // TODO: return Option? |
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379 pub fn mtime(&self) -> i32 { |
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380 self.v1_mtime() |
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381 } |
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382 |
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383 pub fn drop_merge_data(&mut self) { |
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384 if self.flags.contains(Flags::P2_INFO) { |
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385 self.flags.remove(Flags::P2_INFO); |
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386 self.mode_size = None; |
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387 self.mtime = None; |
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388 } |
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389 } |
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390 |
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391 pub fn set_possibly_dirty(&mut self) { |
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392 self.mtime = None |
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393 } |
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394 |
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395 pub fn set_clean(&mut self, mode: i32, size: i32, mtime: i32) { |
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396 self.flags.insert(Flags::WDIR_TRACKED | Flags::P1_TRACKED); |
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397 self.mode_size = Some((mode, size)); |
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398 self.mtime = Some(mtime); |
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399 } |
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400 |
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401 pub fn set_tracked(&mut self) { |
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402 self.flags.insert(Flags::WDIR_TRACKED); |
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403 // `set_tracked` is replacing various `normallookup` call. So we mark |
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404 // the files as needing lookup |
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405 // |
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406 // Consider dropping this in the future in favor of something less |
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407 // broad. |
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408 self.mtime = None; |
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409 } |
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410 |
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411 pub fn set_untracked(&mut self) { |
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412 self.flags.remove(Flags::WDIR_TRACKED); |
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413 self.mode_size = None; |
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414 self.mtime = None; |
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415 } |
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416 |
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417 /// Returns `(state, mode, size, mtime)` for the puprose of serialization |
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418 /// in the dirstate-v1 format. |
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419 /// |
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420 /// This includes marker values such as `mtime == -1`. In the future we may |
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421 /// want to not represent these cases that way in memory, but serialization |
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422 /// will need to keep the same format. |
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423 pub fn v1_data(&self) -> (u8, i32, i32, i32) { |
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424 ( |
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425 self.v1_state().into(), |
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426 self.v1_mode(), |
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427 self.v1_size(), |
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428 self.v1_mtime(), |
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429 ) |
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430 } |
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431 |
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432 pub(crate) fn is_from_other_parent(&self) -> bool { |
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433 self.state() == EntryState::Normal |
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434 && self.size() == SIZE_FROM_OTHER_PARENT |
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435 } |
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436 |
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437 // TODO: other platforms |
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438 #[cfg(unix)] |
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439 pub fn mode_changed( |
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440 &self, |
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441 filesystem_metadata: &std::fs::Metadata, |
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442 ) -> bool { |
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443 use std::os::unix::fs::MetadataExt; |
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444 const EXEC_BIT_MASK: u32 = 0o100; |
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445 let dirstate_exec_bit = (self.mode() as u32) & EXEC_BIT_MASK; |
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446 let fs_exec_bit = filesystem_metadata.mode() & EXEC_BIT_MASK; |
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447 dirstate_exec_bit != fs_exec_bit |
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448 } |
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449 |
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450 /// Returns a `(state, mode, size, mtime)` tuple as for |
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451 /// `DirstateMapMethods::debug_iter`. |
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452 pub fn debug_tuple(&self) -> (u8, i32, i32, i32) { |
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453 (self.state().into(), self.mode(), self.size(), self.mtime()) |
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454 } |
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455 |
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456 pub fn mtime_is_ambiguous(&self, now: i32) -> bool { |
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457 self.state() == EntryState::Normal && self.mtime() == now |
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458 } |
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459 |
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460 pub fn clear_ambiguous_mtime(&mut self, now: i32) -> bool { |
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461 let ambiguous = self.mtime_is_ambiguous(now); |
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462 if ambiguous { |
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463 // The file was last modified "simultaneously" with the current |
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464 // write to dirstate (i.e. within the same second for file- |
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465 // systems with a granularity of 1 sec). This commonly happens |
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466 // for at least a couple of files on 'update'. |
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467 // The user could change the file without changing its size |
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468 // within the same second. Invalidate the file's mtime in |
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469 // dirstate, forcing future 'status' calls to compare the |
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470 // contents of the file if the size is the same. This prevents |
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471 // mistakenly treating such files as clean. |
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472 self.set_possibly_dirty() |
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473 } |
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474 ambiguous |
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475 } |
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476 } |
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477 |
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478 impl EntryState { |
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479 pub fn is_tracked(self) -> bool { |
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480 use EntryState::*; |
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481 match self { |
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482 Normal | Added | Merged => true, |
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483 Removed => false, |
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484 } |
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485 } |
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486 } |
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487 |
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488 impl TryFrom<u8> for EntryState { |
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489 type Error = HgError; |
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490 |
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491 fn try_from(value: u8) -> Result<Self, Self::Error> { |
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492 match value { |
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493 b'n' => Ok(EntryState::Normal), |
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494 b'a' => Ok(EntryState::Added), |
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495 b'r' => Ok(EntryState::Removed), |
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496 b'm' => Ok(EntryState::Merged), |
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497 _ => Err(HgError::CorruptedRepository(format!( |
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498 "Incorrect dirstate entry state {}", |
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499 value |
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500 ))), |
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501 } |
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502 } |
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503 } |
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504 |
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505 impl Into<u8> for EntryState { |
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506 fn into(self) -> u8 { |
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507 match self { |
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508 EntryState::Normal => b'n', |
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509 EntryState::Added => b'a', |
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510 EntryState::Removed => b'r', |
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511 EntryState::Merged => b'm', |
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512 } |
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513 } |
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514 } |