Mercurial > hg
annotate rust/hg-core/src/dirstate/entry.rs @ 48401:995aaacb12d7
dirstate-item: make sure we set the mtime-second-ambiguous on v2 write
We want to preserve the second-ambiguity alongside the ambiguous mtime. So we
use the decimated flag for that.
note: the C code was already doing so. No change was needed to it.
Differential Revision: https://phab.mercurial-scm.org/D11845
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Wed, 24 Nov 2021 05:00:06 +0100 |
parents | 0b3f3a3ca50a |
children | 000130cfafb6 |
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, TryInto}; |
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5 use std::fs; |
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6 use std::io; |
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7 use std::time::{SystemTime, UNIX_EPOCH}; |
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8 |
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9 #[derive(Copy, Clone, Debug, Eq, PartialEq)] |
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10 pub enum EntryState { |
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11 Normal, |
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12 Added, |
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13 Removed, |
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14 Merged, |
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15 } |
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16 |
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17 /// `size` and `mtime.seconds` are truncated to 31 bits. |
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18 /// |
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19 /// TODO: double-check status algorithm correctness for files |
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20 /// larger than 2 GiB or modified after 2038. |
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21 #[derive(Debug, Copy, Clone)] |
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22 pub struct DirstateEntry { |
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23 pub(crate) flags: Flags, |
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24 mode_size: Option<(u32, u32)>, |
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25 mtime: Option<TruncatedTimestamp>, |
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26 } |
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27 |
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28 bitflags! { |
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29 pub(crate) struct Flags: u8 { |
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30 const WDIR_TRACKED = 1 << 0; |
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31 const P1_TRACKED = 1 << 1; |
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32 const P2_INFO = 1 << 2; |
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33 const HAS_FALLBACK_EXEC = 1 << 3; |
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34 const FALLBACK_EXEC = 1 << 4; |
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35 const HAS_FALLBACK_SYMLINK = 1 << 5; |
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36 const FALLBACK_SYMLINK = 1 << 6; |
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37 } |
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38 } |
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39 |
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40 /// A Unix timestamp with nanoseconds precision |
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41 #[derive(Debug, Copy, Clone)] |
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42 pub struct TruncatedTimestamp { |
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43 truncated_seconds: u32, |
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44 /// Always in the `0 .. 1_000_000_000` range. |
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45 nanoseconds: u32, |
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46 /// TODO this should be in DirstateEntry, but the current code needs |
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47 /// refactoring to use DirstateEntry instead of TruncatedTimestamp for |
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48 /// comparison. |
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49 pub second_ambiguous: bool, |
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50 } |
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51 |
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52 impl TruncatedTimestamp { |
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53 /// Constructs from a timestamp potentially outside of the supported range, |
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54 /// and truncate the seconds components to its lower 31 bits. |
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55 /// |
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56 /// Panics if the nanoseconds components is not in the expected range. |
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57 pub fn new_truncate( |
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58 seconds: i64, |
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59 nanoseconds: u32, |
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60 second_ambiguous: bool, |
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61 ) -> Self { |
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62 assert!(nanoseconds < NSEC_PER_SEC); |
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63 Self { |
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64 truncated_seconds: seconds as u32 & RANGE_MASK_31BIT, |
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65 nanoseconds, |
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66 second_ambiguous, |
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67 } |
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68 } |
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69 |
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70 /// Construct from components. Returns an error if they are not in the |
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71 /// expcted range. |
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72 pub fn from_already_truncated( |
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73 truncated_seconds: u32, |
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74 nanoseconds: u32, |
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75 second_ambiguous: bool, |
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76 ) -> Result<Self, DirstateV2ParseError> { |
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77 if truncated_seconds & !RANGE_MASK_31BIT == 0 |
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78 && nanoseconds < NSEC_PER_SEC |
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79 { |
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80 Ok(Self { |
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81 truncated_seconds, |
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82 nanoseconds, |
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83 second_ambiguous, |
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84 }) |
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85 } else { |
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86 Err(DirstateV2ParseError) |
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87 } |
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88 } |
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89 |
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90 pub fn for_mtime_of(metadata: &fs::Metadata) -> io::Result<Self> { |
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91 #[cfg(unix)] |
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92 { |
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93 use std::os::unix::fs::MetadataExt; |
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94 let seconds = metadata.mtime(); |
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95 // i64Â -> u32 with value always in the `0 .. NSEC_PER_SEC` range |
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96 let nanoseconds = metadata.mtime_nsec().try_into().unwrap(); |
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97 Ok(Self::new_truncate(seconds, nanoseconds, false)) |
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98 } |
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99 #[cfg(not(unix))] |
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100 { |
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101 metadata.modified().map(Self::from) |
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102 } |
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103 } |
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104 |
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105 /// The lower 31 bits of the number of seconds since the epoch. |
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106 pub fn truncated_seconds(&self) -> u32 { |
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107 self.truncated_seconds |
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108 } |
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109 |
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110 /// The sub-second component of this timestamp, in nanoseconds. |
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111 /// Always in the `0 .. 1_000_000_000` range. |
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112 /// |
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113 /// This timestamp is after `(seconds, 0)` by this many nanoseconds. |
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114 pub fn nanoseconds(&self) -> u32 { |
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115 self.nanoseconds |
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116 } |
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117 |
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118 /// Returns whether two timestamps are equal modulo 2**31 seconds. |
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119 /// |
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120 /// If this returns `true`, the original values converted from `SystemTime` |
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121 /// or given to `new_truncate` were very likely equal. A false positive is |
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122 /// possible if they were exactly a multiple of 2**31 seconds apart (around |
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123 /// 68 years). This is deemed very unlikely to happen by chance, especially |
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124 /// on filesystems that support sub-second precision. |
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125 /// |
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126 /// If someone is manipulating the modification times of some files to |
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127 /// intentionally make `hg status` return incorrect results, not truncating |
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128 /// wouldn’t help much since they can set exactly the expected timestamp. |
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129 /// |
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130 /// Sub-second precision is ignored if it is zero in either value. |
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131 /// Some APIs simply return zero when more precision is not available. |
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132 /// When comparing values from different sources, if only one is truncated |
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133 /// in that way, doing a simple comparison would cause many false |
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134 /// negatives. |
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135 pub fn likely_equal(self, other: Self) -> bool { |
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136 if self.truncated_seconds != other.truncated_seconds { |
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137 false |
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138 } else if self.nanoseconds == 0 || other.nanoseconds == 0 { |
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139 if self.second_ambiguous { |
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140 false |
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141 } else { |
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142 true |
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143 } |
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144 } else { |
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145 self.nanoseconds == other.nanoseconds |
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146 } |
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147 } |
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148 |
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149 pub fn likely_equal_to_mtime_of( |
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150 self, |
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151 metadata: &fs::Metadata, |
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152 ) -> io::Result<bool> { |
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153 Ok(self.likely_equal(Self::for_mtime_of(metadata)?)) |
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154 } |
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155 } |
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156 |
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157 impl From<SystemTime> for TruncatedTimestamp { |
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158 fn from(system_time: SystemTime) -> Self { |
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159 // On Unix, `SystemTime` is a wrapper for the `timespec` C struct: |
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160 // https://www.gnu.org/software/libc/manual/html_node/Time-Types.html#index-struct-timespec |
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161 // We want to effectively access its fields, but the Rust standard |
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162 // library does not expose them. The best we can do is: |
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163 let seconds; |
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164 let nanoseconds; |
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165 match system_time.duration_since(UNIX_EPOCH) { |
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166 Ok(duration) => { |
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167 seconds = duration.as_secs() as i64; |
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168 nanoseconds = duration.subsec_nanos(); |
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169 } |
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170 Err(error) => { |
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171 // `system_time` is before `UNIX_EPOCH`. |
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172 // We need to undo this algorithm: |
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173 // https://github.com/rust-lang/rust/blob/6bed1f0bc3cc50c10aab26d5f94b16a00776b8a5/library/std/src/sys/unix/time.rs#L40-L41 |
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174 let negative = error.duration(); |
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175 let negative_secs = negative.as_secs() as i64; |
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176 let negative_nanos = negative.subsec_nanos(); |
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177 if negative_nanos == 0 { |
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178 seconds = -negative_secs; |
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179 nanoseconds = 0; |
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180 } else { |
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181 // For example if `system_time` was 4.3Â seconds before |
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182 // the Unix epoch we get a Duration that represents |
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183 // `(-4, -0.3)` but we want `(-5, +0.7)`: |
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184 seconds = -1 - negative_secs; |
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185 nanoseconds = NSEC_PER_SEC - negative_nanos; |
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186 } |
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187 } |
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188 }; |
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189 Self::new_truncate(seconds, nanoseconds, false) |
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190 } |
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191 } |
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192 |
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193 const NSEC_PER_SEC: u32 = 1_000_000_000; |
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194 const RANGE_MASK_31BIT: u32 = 0x7FFF_FFFF; |
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195 |
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196 pub const MTIME_UNSET: i32 = -1; |
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197 |
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198 /// A `DirstateEntry` with a size of `-2` means that it was merged from the |
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199 /// other parent. This allows revert to pick the right status back during a |
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200 /// merge. |
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201 pub const SIZE_FROM_OTHER_PARENT: i32 = -2; |
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202 /// A special value used for internal representation of special case in |
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203 /// dirstate v1 format. |
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204 pub const SIZE_NON_NORMAL: i32 = -1; |
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205 |
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206 impl DirstateEntry { |
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207 pub fn from_v2_data( |
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208 wdir_tracked: bool, |
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209 p1_tracked: bool, |
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210 p2_info: bool, |
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211 mode_size: Option<(u32, u32)>, |
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212 mtime: Option<TruncatedTimestamp>, |
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213 fallback_exec: Option<bool>, |
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214 fallback_symlink: Option<bool>, |
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215 ) -> Self { |
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216 if let Some((mode, size)) = mode_size { |
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217 // TODO: return an error for out of range values? |
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218 assert!(mode & !RANGE_MASK_31BIT == 0); |
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219 assert!(size & !RANGE_MASK_31BIT == 0); |
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220 } |
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221 let mut flags = Flags::empty(); |
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222 flags.set(Flags::WDIR_TRACKED, wdir_tracked); |
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223 flags.set(Flags::P1_TRACKED, p1_tracked); |
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224 flags.set(Flags::P2_INFO, p2_info); |
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225 if let Some(exec) = fallback_exec { |
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226 flags.insert(Flags::HAS_FALLBACK_EXEC); |
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227 if exec { |
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228 flags.insert(Flags::FALLBACK_EXEC); |
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229 } |
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230 } |
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231 if let Some(exec) = fallback_symlink { |
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232 flags.insert(Flags::HAS_FALLBACK_SYMLINK); |
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233 if exec { |
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234 flags.insert(Flags::FALLBACK_SYMLINK); |
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235 } |
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236 } |
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237 Self { |
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238 flags, |
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239 mode_size, |
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240 mtime, |
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241 } |
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242 } |
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243 |
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244 pub fn from_v1_data( |
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245 state: EntryState, |
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246 mode: i32, |
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247 size: i32, |
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248 mtime: i32, |
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249 ) -> Self { |
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250 match state { |
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251 EntryState::Normal => { |
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252 if size == SIZE_FROM_OTHER_PARENT { |
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253 Self { |
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254 // might be missing P1_TRACKED |
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255 flags: Flags::WDIR_TRACKED | Flags::P2_INFO, |
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256 mode_size: None, |
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257 mtime: None, |
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258 } |
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259 } else if size == SIZE_NON_NORMAL { |
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260 Self { |
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261 flags: Flags::WDIR_TRACKED | Flags::P1_TRACKED, |
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262 mode_size: None, |
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263 mtime: None, |
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264 } |
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265 } else if mtime == MTIME_UNSET { |
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266 // TODO:Â return an error for negative values? |
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267 let mode = u32::try_from(mode).unwrap(); |
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268 let size = u32::try_from(size).unwrap(); |
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269 Self { |
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270 flags: Flags::WDIR_TRACKED | Flags::P1_TRACKED, |
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271 mode_size: Some((mode, size)), |
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272 mtime: None, |
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273 } |
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274 } else { |
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275 // TODO:Â return an error for negative values? |
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276 let mode = u32::try_from(mode).unwrap(); |
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277 let size = u32::try_from(size).unwrap(); |
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278 let mtime = u32::try_from(mtime).unwrap(); |
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279 let mtime = TruncatedTimestamp::from_already_truncated( |
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280 mtime, 0, false, |
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281 ) |
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282 .unwrap(); |
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283 Self { |
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284 flags: Flags::WDIR_TRACKED | Flags::P1_TRACKED, |
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285 mode_size: Some((mode, size)), |
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286 mtime: Some(mtime), |
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287 } |
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288 } |
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289 } |
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290 EntryState::Added => Self { |
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291 flags: Flags::WDIR_TRACKED, |
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292 mode_size: None, |
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293 mtime: None, |
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294 }, |
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295 EntryState::Removed => Self { |
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296 flags: if size == SIZE_NON_NORMAL { |
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297 Flags::P1_TRACKED | Flags::P2_INFO |
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298 } else if size == SIZE_FROM_OTHER_PARENT { |
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299 // We don’t know if P1_TRACKED should be set (file history) |
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300 Flags::P2_INFO |
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301 } else { |
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302 Flags::P1_TRACKED |
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303 }, |
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304 mode_size: None, |
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305 mtime: None, |
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306 }, |
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307 EntryState::Merged => Self { |
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308 flags: Flags::WDIR_TRACKED |
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309 | Flags::P1_TRACKED // might not be true because of rename ? |
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310 | Flags::P2_INFO, // might not be true because of rename ? |
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311 mode_size: None, |
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312 mtime: None, |
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313 }, |
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314 } |
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315 } |
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316 |
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317 /// Creates a new entry in "removed" state. |
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318 /// |
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319 /// `size` is expected to be zero, `SIZE_NON_NORMAL`, or |
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320 /// `SIZE_FROM_OTHER_PARENT` |
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321 pub fn new_removed(size: i32) -> Self { |
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322 Self::from_v1_data(EntryState::Removed, 0, size, 0) |
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323 } |
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324 |
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325 pub fn tracked(&self) -> bool { |
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326 self.flags.contains(Flags::WDIR_TRACKED) |
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327 } |
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328 |
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329 pub fn p1_tracked(&self) -> bool { |
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330 self.flags.contains(Flags::P1_TRACKED) |
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331 } |
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332 |
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333 fn in_either_parent(&self) -> bool { |
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334 self.flags.intersects(Flags::P1_TRACKED | Flags::P2_INFO) |
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335 } |
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336 |
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337 pub fn removed(&self) -> bool { |
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338 self.in_either_parent() && !self.flags.contains(Flags::WDIR_TRACKED) |
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339 } |
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340 |
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341 pub fn p2_info(&self) -> bool { |
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342 self.flags.contains(Flags::WDIR_TRACKED | Flags::P2_INFO) |
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343 } |
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344 |
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345 pub fn added(&self) -> bool { |
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346 self.flags.contains(Flags::WDIR_TRACKED) && !self.in_either_parent() |
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347 } |
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348 |
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349 pub fn maybe_clean(&self) -> bool { |
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350 if !self.flags.contains(Flags::WDIR_TRACKED) { |
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351 false |
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352 } else if !self.flags.contains(Flags::P1_TRACKED) { |
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353 false |
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354 } else if self.flags.contains(Flags::P2_INFO) { |
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355 false |
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356 } else { |
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357 true |
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358 } |
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359 } |
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360 |
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361 pub fn any_tracked(&self) -> bool { |
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362 self.flags.intersects( |
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363 Flags::WDIR_TRACKED | Flags::P1_TRACKED | Flags::P2_INFO, |
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364 ) |
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365 } |
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366 |
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367 /// Returns `(wdir_tracked, p1_tracked, p2_info, mode_size, mtime)` |
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368 pub(crate) fn v2_data( |
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369 &self, |
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370 ) -> ( |
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371 bool, |
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372 bool, |
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373 bool, |
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374 Option<(u32, u32)>, |
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375 Option<TruncatedTimestamp>, |
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376 Option<bool>, |
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377 Option<bool>, |
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378 ) { |
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379 if !self.any_tracked() { |
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380 // TODO: return an Option instead? |
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381 panic!("Accessing v1_state of an untracked DirstateEntry") |
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382 } |
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383 let wdir_tracked = self.flags.contains(Flags::WDIR_TRACKED); |
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384 let p1_tracked = self.flags.contains(Flags::P1_TRACKED); |
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385 let p2_info = self.flags.contains(Flags::P2_INFO); |
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386 let mode_size = self.mode_size; |
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387 let mtime = self.mtime; |
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388 ( |
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389 wdir_tracked, |
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390 p1_tracked, |
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391 p2_info, |
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392 mode_size, |
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393 mtime, |
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394 self.get_fallback_exec(), |
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395 self.get_fallback_symlink(), |
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396 ) |
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397 } |
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398 |
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399 fn v1_state(&self) -> EntryState { |
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400 if !self.any_tracked() { |
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401 // TODO: return an Option instead? |
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402 panic!("Accessing v1_state of an untracked DirstateEntry") |
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403 } |
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404 if self.removed() { |
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405 EntryState::Removed |
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406 } else if self |
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407 .flags |
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408 .contains(Flags::WDIR_TRACKED | Flags::P1_TRACKED | Flags::P2_INFO) |
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409 { |
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410 EntryState::Merged |
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411 } else if self.added() { |
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412 EntryState::Added |
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413 } else { |
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414 EntryState::Normal |
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415 } |
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416 } |
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417 |
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418 fn v1_mode(&self) -> i32 { |
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419 if let Some((mode, _size)) = self.mode_size { |
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420 i32::try_from(mode).unwrap() |
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421 } else { |
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422 0 |
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423 } |
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424 } |
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425 |
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426 fn v1_size(&self) -> i32 { |
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427 if !self.any_tracked() { |
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428 // TODO: return an Option instead? |
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429 panic!("Accessing v1_size of an untracked DirstateEntry") |
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430 } |
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431 if self.removed() |
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432 && self.flags.contains(Flags::P1_TRACKED | Flags::P2_INFO) |
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433 { |
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434 SIZE_NON_NORMAL |
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435 } else if self.flags.contains(Flags::P2_INFO) { |
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436 SIZE_FROM_OTHER_PARENT |
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437 } else if self.removed() { |
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438 0 |
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439 } else if self.added() { |
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440 SIZE_NON_NORMAL |
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441 } else if let Some((_mode, size)) = self.mode_size { |
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442 i32::try_from(size).unwrap() |
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443 } else { |
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444 SIZE_NON_NORMAL |
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445 } |
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446 } |
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447 |
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448 fn v1_mtime(&self) -> i32 { |
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449 if !self.any_tracked() { |
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450 // TODO: return an Option instead? |
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451 panic!("Accessing v1_mtime of an untracked DirstateEntry") |
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452 } |
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453 if self.removed() { |
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454 0 |
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455 } else if self.flags.contains(Flags::P2_INFO) { |
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456 MTIME_UNSET |
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457 } else if !self.flags.contains(Flags::P1_TRACKED) { |
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458 MTIME_UNSET |
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459 } else if let Some(mtime) = self.mtime { |
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460 if mtime.second_ambiguous { |
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461 MTIME_UNSET |
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462 } else { |
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463 i32::try_from(mtime.truncated_seconds()).unwrap() |
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464 } |
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465 } else { |
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466 MTIME_UNSET |
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467 } |
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468 } |
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469 |
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470 // TODO: return `Option<EntryState>`? None when `!self.any_tracked` |
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471 pub fn state(&self) -> EntryState { |
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472 self.v1_state() |
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473 } |
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474 |
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475 // TODO: return Option? |
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476 pub fn mode(&self) -> i32 { |
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477 self.v1_mode() |
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478 } |
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479 |
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480 // TODO: return Option? |
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481 pub fn size(&self) -> i32 { |
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482 self.v1_size() |
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483 } |
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484 |
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485 // TODO: return Option? |
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486 pub fn mtime(&self) -> i32 { |
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487 self.v1_mtime() |
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488 } |
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489 |
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490 pub fn get_fallback_exec(&self) -> Option<bool> { |
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491 if self.flags.contains(Flags::HAS_FALLBACK_EXEC) { |
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492 Some(self.flags.contains(Flags::FALLBACK_EXEC)) |
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493 } else { |
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494 None |
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495 } |
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496 } |
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497 |
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498 pub fn set_fallback_exec(&mut self, value: Option<bool>) { |
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499 match value { |
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500 None => { |
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501 self.flags.remove(Flags::HAS_FALLBACK_EXEC); |
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502 self.flags.remove(Flags::FALLBACK_EXEC); |
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503 } |
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504 Some(exec) => { |
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505 self.flags.insert(Flags::HAS_FALLBACK_EXEC); |
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506 if exec { |
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507 self.flags.insert(Flags::FALLBACK_EXEC); |
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508 } |
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509 } |
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510 } |
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511 } |
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512 |
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513 pub fn get_fallback_symlink(&self) -> Option<bool> { |
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514 if self.flags.contains(Flags::HAS_FALLBACK_SYMLINK) { |
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515 Some(self.flags.contains(Flags::FALLBACK_SYMLINK)) |
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516 } else { |
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517 None |
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518 } |
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519 } |
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520 |
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521 pub fn set_fallback_symlink(&mut self, value: Option<bool>) { |
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522 match value { |
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523 None => { |
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524 self.flags.remove(Flags::HAS_FALLBACK_SYMLINK); |
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525 self.flags.remove(Flags::FALLBACK_SYMLINK); |
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526 } |
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527 Some(symlink) => { |
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528 self.flags.insert(Flags::HAS_FALLBACK_SYMLINK); |
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529 if symlink { |
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530 self.flags.insert(Flags::FALLBACK_SYMLINK); |
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531 } |
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532 } |
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533 } |
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534 } |
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535 |
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536 pub fn truncated_mtime(&self) -> Option<TruncatedTimestamp> { |
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537 self.mtime |
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538 } |
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539 |
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540 pub fn drop_merge_data(&mut self) { |
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541 if self.flags.contains(Flags::P2_INFO) { |
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542 self.flags.remove(Flags::P2_INFO); |
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543 self.mode_size = None; |
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544 self.mtime = None; |
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545 } |
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546 } |
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547 |
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548 pub fn set_possibly_dirty(&mut self) { |
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549 self.mtime = None |
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550 } |
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551 |
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552 pub fn set_clean( |
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553 &mut self, |
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554 mode: u32, |
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555 size: u32, |
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556 mtime: TruncatedTimestamp, |
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557 ) { |
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558 let size = size & RANGE_MASK_31BIT; |
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559 self.flags.insert(Flags::WDIR_TRACKED | Flags::P1_TRACKED); |
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560 self.mode_size = Some((mode, size)); |
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561 self.mtime = Some(mtime); |
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562 } |
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563 |
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564 pub fn set_tracked(&mut self) { |
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565 self.flags.insert(Flags::WDIR_TRACKED); |
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566 // `set_tracked` is replacing various `normallookup` call. So we mark |
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567 // the files as needing lookup |
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568 // |
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569 // Consider dropping this in the future in favor of something less |
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570 // broad. |
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571 self.mtime = None; |
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572 } |
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573 |
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574 pub fn set_untracked(&mut self) { |
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575 self.flags.remove(Flags::WDIR_TRACKED); |
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576 self.mode_size = None; |
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577 self.mtime = None; |
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578 } |
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579 |
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580 /// Returns `(state, mode, size, mtime)` for the puprose of serialization |
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581 /// in the dirstate-v1 format. |
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582 /// |
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583 /// This includes marker values such as `mtime == -1`. In the future we may |
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584 /// want to not represent these cases that way in memory, but serialization |
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585 /// will need to keep the same format. |
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586 pub fn v1_data(&self) -> (u8, i32, i32, i32) { |
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587 ( |
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588 self.v1_state().into(), |
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589 self.v1_mode(), |
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590 self.v1_size(), |
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591 self.v1_mtime(), |
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592 ) |
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593 } |
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594 |
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595 pub(crate) fn is_from_other_parent(&self) -> bool { |
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596 self.state() == EntryState::Normal |
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597 && self.size() == SIZE_FROM_OTHER_PARENT |
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598 } |
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599 |
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600 // TODO: other platforms |
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601 #[cfg(unix)] |
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602 pub fn mode_changed( |
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603 &self, |
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604 filesystem_metadata: &std::fs::Metadata, |
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605 ) -> bool { |
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606 let dirstate_exec_bit = (self.mode() as u32 & EXEC_BIT_MASK) != 0; |
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607 let fs_exec_bit = has_exec_bit(filesystem_metadata); |
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608 dirstate_exec_bit != fs_exec_bit |
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609 } |
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610 |
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611 /// Returns a `(state, mode, size, mtime)` tuple as for |
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612 /// `DirstateMapMethods::debug_iter`. |
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613 pub fn debug_tuple(&self) -> (u8, i32, i32, i32) { |
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614 (self.state().into(), self.mode(), self.size(), self.mtime()) |
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615 } |
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616 } |
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617 |
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618 impl EntryState { |
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619 pub fn is_tracked(self) -> bool { |
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620 use EntryState::*; |
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621 match self { |
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622 Normal | Added | Merged => true, |
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623 Removed => false, |
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624 } |
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625 } |
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626 } |
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627 |
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628 impl TryFrom<u8> for EntryState { |
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629 type Error = HgError; |
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630 |
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631 fn try_from(value: u8) -> Result<Self, Self::Error> { |
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632 match value { |
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633 b'n' => Ok(EntryState::Normal), |
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634 b'a' => Ok(EntryState::Added), |
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635 b'r' => Ok(EntryState::Removed), |
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636 b'm' => Ok(EntryState::Merged), |
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637 _ => Err(HgError::CorruptedRepository(format!( |
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638 "Incorrect dirstate entry state {}", |
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639 value |
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640 ))), |
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641 } |
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642 } |
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643 } |
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644 |
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645 impl Into<u8> for EntryState { |
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646 fn into(self) -> u8 { |
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647 match self { |
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648 EntryState::Normal => b'n', |
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649 EntryState::Added => b'a', |
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650 EntryState::Removed => b'r', |
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651 EntryState::Merged => b'm', |
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652 } |
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653 } |
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654 } |
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655 |
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656 const EXEC_BIT_MASK: u32 = 0o100; |
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657 |
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658 pub fn has_exec_bit(metadata: &std::fs::Metadata) -> bool { |
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659 // TODO: How to handle executable permissions on Windows? |
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660 use std::os::unix::fs::MetadataExt; |
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661 (metadata.mode() & EXEC_BIT_MASK) != 0 |
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662 } |