Mercurial > hg
annotate rust/hg-core/src/dirstate/entry.rs @ 48263:83d0bd45b662
dirstate-v2: actually use sub-second mtime precision
Instead of zero, set the nanoseconds field to its correct value whenever
possible and preserve it across serialization+parsing.
Differential Revision: https://phab.mercurial-scm.org/D11702
author | Simon Sapin <simon.sapin@octobus.net> |
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date | Wed, 13 Oct 2021 15:58:14 +0200 |
parents | 68bb472aee9c |
children | d5a91701f7dc |
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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 } |
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47 |
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48 impl TruncatedTimestamp { |
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49 /// Constructs from a timestamp potentially outside of the supported range, |
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50 /// and truncate the seconds components to its lower 31 bits. |
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51 /// |
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52 /// Panics if the nanoseconds components is not in the expected range. |
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53 pub fn new_truncate(seconds: i64, nanoseconds: u32) -> Self { |
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54 assert!(nanoseconds < NSEC_PER_SEC); |
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55 Self { |
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56 truncated_seconds: seconds as u32 & RANGE_MASK_31BIT, |
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57 nanoseconds, |
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58 } |
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59 } |
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60 |
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61 /// Construct from components. Returns an error if they are not in the |
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62 /// expcted range. |
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63 pub fn from_already_truncated( |
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64 truncated_seconds: u32, |
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65 nanoseconds: u32, |
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66 ) -> Result<Self, DirstateV2ParseError> { |
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67 if truncated_seconds & !RANGE_MASK_31BIT == 0 |
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68 && nanoseconds < NSEC_PER_SEC |
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69 { |
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70 Ok(Self { |
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71 truncated_seconds, |
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72 nanoseconds, |
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73 }) |
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74 } else { |
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75 Err(DirstateV2ParseError) |
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76 } |
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77 } |
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78 |
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79 pub fn for_mtime_of(metadata: &fs::Metadata) -> io::Result<Self> { |
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80 #[cfg(unix)] |
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81 { |
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82 use std::os::unix::fs::MetadataExt; |
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83 let seconds = metadata.mtime(); |
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84 // i64Â -> u32 with value always in the `0 .. NSEC_PER_SEC` range |
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85 let nanoseconds = metadata.mtime_nsec().try_into().unwrap(); |
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86 Ok(Self::new_truncate(seconds, nanoseconds)) |
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87 } |
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88 #[cfg(not(unix))] |
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89 { |
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90 metadata.modified().map(Self::from) |
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91 } |
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92 } |
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93 |
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94 /// The lower 31 bits of the number of seconds since the epoch. |
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95 pub fn truncated_seconds(&self) -> u32 { |
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96 self.truncated_seconds |
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97 } |
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98 |
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99 /// The sub-second component of this timestamp, in nanoseconds. |
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100 /// Always in the `0 .. 1_000_000_000` range. |
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101 /// |
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102 /// This timestamp is after `(seconds, 0)` by this many nanoseconds. |
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103 pub fn nanoseconds(&self) -> u32 { |
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104 self.nanoseconds |
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105 } |
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106 |
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107 /// Returns whether two timestamps are equal modulo 2**31 seconds. |
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108 /// |
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109 /// If this returns `true`, the original values converted from `SystemTime` |
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110 /// or given to `new_truncate` were very likely equal. A false positive is |
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111 /// possible if they were exactly a multiple of 2**31 seconds apart (around |
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112 /// 68 years). This is deemed very unlikely to happen by chance, especially |
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113 /// on filesystems that support sub-second precision. |
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114 /// |
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115 /// If someone is manipulating the modification times of some files to |
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116 /// intentionally make `hg status` return incorrect results, not truncating |
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117 /// wouldn’t help much since they can set exactly the expected timestamp. |
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118 /// |
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119 /// Sub-second precision is ignored if it is zero in either value. |
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120 /// Some APIs simply return zero when more precision is not available. |
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121 /// When comparing values from different sources, if only one is truncated |
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122 /// in that way, doing a simple comparison would cause many false |
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123 /// negatives. |
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124 pub fn likely_equal(self, other: Self) -> bool { |
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125 self.truncated_seconds == other.truncated_seconds |
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126 && (self.nanoseconds == other.nanoseconds |
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127 || self.nanoseconds == 0 |
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128 || other.nanoseconds == 0) |
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129 } |
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130 |
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131 pub fn likely_equal_to_mtime_of( |
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132 self, |
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133 metadata: &fs::Metadata, |
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134 ) -> io::Result<bool> { |
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135 Ok(self.likely_equal(Self::for_mtime_of(metadata)?)) |
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136 } |
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137 } |
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138 |
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139 impl From<SystemTime> for TruncatedTimestamp { |
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140 fn from(system_time: SystemTime) -> Self { |
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141 // On Unix, `SystemTime` is a wrapper for the `timespec` C struct: |
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142 // https://www.gnu.org/software/libc/manual/html_node/Time-Types.html#index-struct-timespec |
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143 // We want to effectively access its fields, but the Rust standard |
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144 // library does not expose them. The best we can do is: |
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145 let seconds; |
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146 let nanoseconds; |
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147 match system_time.duration_since(UNIX_EPOCH) { |
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148 Ok(duration) => { |
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149 seconds = duration.as_secs() as i64; |
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150 nanoseconds = duration.subsec_nanos(); |
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151 } |
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152 Err(error) => { |
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153 // `system_time` is before `UNIX_EPOCH`. |
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154 // We need to undo this algorithm: |
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155 // https://github.com/rust-lang/rust/blob/6bed1f0bc3cc50c10aab26d5f94b16a00776b8a5/library/std/src/sys/unix/time.rs#L40-L41 |
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156 let negative = error.duration(); |
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157 let negative_secs = negative.as_secs() as i64; |
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158 let negative_nanos = negative.subsec_nanos(); |
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159 if negative_nanos == 0 { |
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160 seconds = -negative_secs; |
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161 nanoseconds = 0; |
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162 } else { |
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163 // For example if `system_time` was 4.3Â seconds before |
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164 // the Unix epoch we get a Duration that represents |
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165 // `(-4, -0.3)` but we want `(-5, +0.7)`: |
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166 seconds = -1 - negative_secs; |
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167 nanoseconds = NSEC_PER_SEC - negative_nanos; |
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168 } |
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169 } |
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170 }; |
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171 Self::new_truncate(seconds, nanoseconds) |
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172 } |
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173 } |
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174 |
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175 const NSEC_PER_SEC: u32 = 1_000_000_000; |
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176 const RANGE_MASK_31BIT: u32 = 0x7FFF_FFFF; |
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177 |
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178 pub const MTIME_UNSET: i32 = -1; |
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179 |
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180 /// A `DirstateEntry` with a size of `-2` means that it was merged from the |
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181 /// other parent. This allows revert to pick the right status back during a |
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182 /// merge. |
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183 pub const SIZE_FROM_OTHER_PARENT: i32 = -2; |
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184 /// A special value used for internal representation of special case in |
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185 /// dirstate v1 format. |
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186 pub const SIZE_NON_NORMAL: i32 = -1; |
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187 |
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188 impl DirstateEntry { |
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189 pub fn from_v2_data( |
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190 wdir_tracked: bool, |
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191 p1_tracked: bool, |
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192 p2_info: bool, |
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193 mode_size: Option<(u32, u32)>, |
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194 mtime: Option<TruncatedTimestamp>, |
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195 fallback_exec: Option<bool>, |
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196 fallback_symlink: Option<bool>, |
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197 ) -> Self { |
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198 if let Some((mode, size)) = mode_size { |
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199 // TODO: return an error for out of range values? |
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200 assert!(mode & !RANGE_MASK_31BIT == 0); |
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201 assert!(size & !RANGE_MASK_31BIT == 0); |
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202 } |
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203 let mut flags = Flags::empty(); |
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204 flags.set(Flags::WDIR_TRACKED, wdir_tracked); |
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205 flags.set(Flags::P1_TRACKED, p1_tracked); |
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206 flags.set(Flags::P2_INFO, p2_info); |
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207 if let Some(exec) = fallback_exec { |
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208 flags.insert(Flags::HAS_FALLBACK_EXEC); |
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209 if exec { |
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210 flags.insert(Flags::FALLBACK_EXEC); |
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211 } |
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212 } |
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213 if let Some(exec) = fallback_symlink { |
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214 flags.insert(Flags::HAS_FALLBACK_SYMLINK); |
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215 if exec { |
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216 flags.insert(Flags::FALLBACK_SYMLINK); |
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217 } |
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218 } |
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219 Self { |
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220 flags, |
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221 mode_size, |
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222 mtime, |
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223 } |
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224 } |
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225 |
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226 pub fn from_v1_data( |
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227 state: EntryState, |
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228 mode: i32, |
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229 size: i32, |
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230 mtime: i32, |
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231 ) -> Self { |
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232 match state { |
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233 EntryState::Normal => { |
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234 if size == SIZE_FROM_OTHER_PARENT { |
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235 Self { |
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236 // might be missing P1_TRACKED |
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237 flags: Flags::WDIR_TRACKED | Flags::P2_INFO, |
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238 mode_size: None, |
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239 mtime: None, |
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240 } |
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241 } else if size == SIZE_NON_NORMAL { |
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242 Self { |
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243 flags: Flags::WDIR_TRACKED | Flags::P1_TRACKED, |
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244 mode_size: None, |
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245 mtime: None, |
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246 } |
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247 } else if mtime == MTIME_UNSET { |
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248 // TODO:Â return an error for negative values? |
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249 let mode = u32::try_from(mode).unwrap(); |
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250 let size = u32::try_from(size).unwrap(); |
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251 Self { |
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252 flags: Flags::WDIR_TRACKED | Flags::P1_TRACKED, |
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253 mode_size: Some((mode, size)), |
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254 mtime: None, |
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255 } |
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256 } else { |
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257 // TODO:Â return an error for negative values? |
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258 let mode = u32::try_from(mode).unwrap(); |
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259 let size = u32::try_from(size).unwrap(); |
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260 let mtime = u32::try_from(mtime).unwrap(); |
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261 let mtime = |
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262 TruncatedTimestamp::from_already_truncated(mtime, 0) |
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263 .unwrap(); |
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264 Self { |
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265 flags: Flags::WDIR_TRACKED | Flags::P1_TRACKED, |
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266 mode_size: Some((mode, size)), |
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267 mtime: Some(mtime), |
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268 } |
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269 } |
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270 } |
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271 EntryState::Added => Self { |
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272 flags: Flags::WDIR_TRACKED, |
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273 mode_size: None, |
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274 mtime: None, |
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275 }, |
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276 EntryState::Removed => Self { |
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277 flags: if size == SIZE_NON_NORMAL { |
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278 Flags::P1_TRACKED | Flags::P2_INFO |
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279 } else if size == SIZE_FROM_OTHER_PARENT { |
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280 // We don’t know if P1_TRACKED should be set (file history) |
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281 Flags::P2_INFO |
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282 } else { |
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283 Flags::P1_TRACKED |
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284 }, |
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285 mode_size: None, |
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286 mtime: None, |
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287 }, |
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288 EntryState::Merged => Self { |
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289 flags: Flags::WDIR_TRACKED |
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290 | Flags::P1_TRACKED // might not be true because of rename ? |
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291 | Flags::P2_INFO, // might not be true because of rename ? |
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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 } |
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296 } |
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297 |
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298 /// Creates a new entry in "removed" state. |
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299 /// |
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300 /// `size` is expected to be zero, `SIZE_NON_NORMAL`, or |
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301 /// `SIZE_FROM_OTHER_PARENT` |
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302 pub fn new_removed(size: i32) -> Self { |
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303 Self::from_v1_data(EntryState::Removed, 0, size, 0) |
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304 } |
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305 |
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306 pub fn tracked(&self) -> bool { |
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307 self.flags.contains(Flags::WDIR_TRACKED) |
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308 } |
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309 |
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310 pub fn p1_tracked(&self) -> bool { |
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311 self.flags.contains(Flags::P1_TRACKED) |
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312 } |
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313 |
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314 fn in_either_parent(&self) -> bool { |
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315 self.flags.intersects(Flags::P1_TRACKED | Flags::P2_INFO) |
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316 } |
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317 |
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318 pub fn removed(&self) -> bool { |
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319 self.in_either_parent() && !self.flags.contains(Flags::WDIR_TRACKED) |
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320 } |
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321 |
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322 pub fn p2_info(&self) -> bool { |
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323 self.flags.contains(Flags::WDIR_TRACKED | Flags::P2_INFO) |
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324 } |
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325 |
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326 pub fn added(&self) -> bool { |
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327 self.flags.contains(Flags::WDIR_TRACKED) && !self.in_either_parent() |
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328 } |
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329 |
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330 pub fn maybe_clean(&self) -> bool { |
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331 if !self.flags.contains(Flags::WDIR_TRACKED) { |
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332 false |
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333 } else if !self.flags.contains(Flags::P1_TRACKED) { |
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334 false |
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335 } else if self.flags.contains(Flags::P2_INFO) { |
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336 false |
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337 } else { |
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338 true |
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339 } |
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340 } |
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341 |
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342 pub fn any_tracked(&self) -> bool { |
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343 self.flags.intersects( |
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344 Flags::WDIR_TRACKED | Flags::P1_TRACKED | Flags::P2_INFO, |
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345 ) |
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346 } |
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347 |
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348 /// Returns `(wdir_tracked, p1_tracked, p2_info, mode_size, mtime)` |
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349 pub(crate) fn v2_data( |
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350 &self, |
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351 ) -> ( |
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352 bool, |
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353 bool, |
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354 bool, |
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355 Option<(u32, u32)>, |
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356 Option<TruncatedTimestamp>, |
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357 Option<bool>, |
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358 Option<bool>, |
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359 ) { |
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360 if !self.any_tracked() { |
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361 // TODO: return an Option instead? |
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362 panic!("Accessing v1_state of an untracked DirstateEntry") |
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363 } |
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364 let wdir_tracked = self.flags.contains(Flags::WDIR_TRACKED); |
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365 let p1_tracked = self.flags.contains(Flags::P1_TRACKED); |
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366 let p2_info = self.flags.contains(Flags::P2_INFO); |
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367 let mode_size = self.mode_size; |
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368 let mtime = self.mtime; |
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369 ( |
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370 wdir_tracked, |
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371 p1_tracked, |
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372 p2_info, |
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373 mode_size, |
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374 mtime, |
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375 self.get_fallback_exec(), |
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376 self.get_fallback_symlink(), |
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377 ) |
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378 } |
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379 |
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380 fn v1_state(&self) -> EntryState { |
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381 if !self.any_tracked() { |
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382 // TODO: return an Option instead? |
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383 panic!("Accessing v1_state of an untracked DirstateEntry") |
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384 } |
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385 if self.removed() { |
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386 EntryState::Removed |
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387 } else if self |
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388 .flags |
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389 .contains(Flags::WDIR_TRACKED | Flags::P1_TRACKED | Flags::P2_INFO) |
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390 { |
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391 EntryState::Merged |
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392 } else if self.added() { |
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393 EntryState::Added |
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394 } else { |
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395 EntryState::Normal |
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396 } |
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397 } |
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398 |
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399 fn v1_mode(&self) -> i32 { |
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400 if let Some((mode, _size)) = self.mode_size { |
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401 i32::try_from(mode).unwrap() |
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402 } else { |
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403 0 |
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404 } |
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405 } |
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406 |
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407 fn v1_size(&self) -> i32 { |
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408 if !self.any_tracked() { |
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409 // TODO: return an Option instead? |
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410 panic!("Accessing v1_size of an untracked DirstateEntry") |
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411 } |
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412 if self.removed() |
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413 && self.flags.contains(Flags::P1_TRACKED | Flags::P2_INFO) |
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414 { |
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415 SIZE_NON_NORMAL |
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416 } else if self.flags.contains(Flags::P2_INFO) { |
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417 SIZE_FROM_OTHER_PARENT |
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418 } else if self.removed() { |
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419 0 |
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420 } else if self.added() { |
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421 SIZE_NON_NORMAL |
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422 } else if let Some((_mode, size)) = self.mode_size { |
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423 i32::try_from(size).unwrap() |
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424 } else { |
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425 SIZE_NON_NORMAL |
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426 } |
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427 } |
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428 |
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429 fn v1_mtime(&self) -> i32 { |
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430 if !self.any_tracked() { |
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431 // TODO: return an Option instead? |
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432 panic!("Accessing v1_mtime of an untracked DirstateEntry") |
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433 } |
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434 if self.removed() { |
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435 0 |
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436 } else if self.flags.contains(Flags::P2_INFO) { |
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437 MTIME_UNSET |
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438 } else if !self.flags.contains(Flags::P1_TRACKED) { |
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439 MTIME_UNSET |
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440 } else if let Some(mtime) = self.mtime { |
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441 i32::try_from(mtime.truncated_seconds()).unwrap() |
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442 } else { |
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443 MTIME_UNSET |
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444 } |
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445 } |
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446 |
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447 // TODO: return `Option<EntryState>`? None when `!self.any_tracked` |
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448 pub fn state(&self) -> EntryState { |
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449 self.v1_state() |
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450 } |
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451 |
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452 // TODO: return Option? |
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453 pub fn mode(&self) -> i32 { |
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454 self.v1_mode() |
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455 } |
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456 |
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457 // TODO: return Option? |
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458 pub fn size(&self) -> i32 { |
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459 self.v1_size() |
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460 } |
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461 |
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462 // TODO: return Option? |
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463 pub fn mtime(&self) -> i32 { |
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464 self.v1_mtime() |
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465 } |
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466 |
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467 pub fn get_fallback_exec(&self) -> Option<bool> { |
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468 if self.flags.contains(Flags::HAS_FALLBACK_EXEC) { |
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469 Some(self.flags.contains(Flags::FALLBACK_EXEC)) |
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470 } else { |
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471 None |
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472 } |
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473 } |
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474 |
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475 pub fn set_fallback_exec(&mut self, value: Option<bool>) { |
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476 match value { |
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477 None => { |
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478 self.flags.remove(Flags::HAS_FALLBACK_EXEC); |
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479 self.flags.remove(Flags::FALLBACK_EXEC); |
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480 } |
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481 Some(exec) => { |
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482 self.flags.insert(Flags::HAS_FALLBACK_EXEC); |
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483 if exec { |
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484 self.flags.insert(Flags::FALLBACK_EXEC); |
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485 } |
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486 } |
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487 } |
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488 } |
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489 |
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490 pub fn get_fallback_symlink(&self) -> Option<bool> { |
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491 if self.flags.contains(Flags::HAS_FALLBACK_SYMLINK) { |
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492 Some(self.flags.contains(Flags::FALLBACK_SYMLINK)) |
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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_symlink(&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_SYMLINK); |
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502 self.flags.remove(Flags::FALLBACK_SYMLINK); |
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503 } |
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504 Some(symlink) => { |
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505 self.flags.insert(Flags::HAS_FALLBACK_SYMLINK); |
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506 if symlink { |
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507 self.flags.insert(Flags::FALLBACK_SYMLINK); |
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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 truncated_mtime(&self) -> Option<TruncatedTimestamp> { |
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514 self.mtime |
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515 } |
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516 |
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517 pub fn drop_merge_data(&mut self) { |
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518 if self.flags.contains(Flags::P2_INFO) { |
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519 self.flags.remove(Flags::P2_INFO); |
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520 self.mode_size = None; |
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521 self.mtime = None; |
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522 } |
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523 } |
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524 |
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525 pub fn set_possibly_dirty(&mut self) { |
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526 self.mtime = None |
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527 } |
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528 |
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529 pub fn set_clean( |
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530 &mut self, |
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531 mode: u32, |
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532 size: u32, |
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533 mtime: TruncatedTimestamp, |
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534 ) { |
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535 let size = size & RANGE_MASK_31BIT; |
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536 self.flags.insert(Flags::WDIR_TRACKED | Flags::P1_TRACKED); |
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537 self.mode_size = Some((mode, size)); |
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538 self.mtime = Some(mtime); |
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539 } |
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540 |
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541 pub fn set_tracked(&mut self) { |
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542 self.flags.insert(Flags::WDIR_TRACKED); |
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543 // `set_tracked` is replacing various `normallookup` call. So we mark |
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544 // the files as needing lookup |
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545 // |
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546 // Consider dropping this in the future in favor of something less |
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547 // broad. |
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548 self.mtime = None; |
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549 } |
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550 |
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551 pub fn set_untracked(&mut self) { |
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552 self.flags.remove(Flags::WDIR_TRACKED); |
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553 self.mode_size = None; |
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554 self.mtime = None; |
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555 } |
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556 |
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557 /// Returns `(state, mode, size, mtime)` for the puprose of serialization |
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558 /// in the dirstate-v1 format. |
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559 /// |
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560 /// This includes marker values such as `mtime == -1`. In the future we may |
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561 /// want to not represent these cases that way in memory, but serialization |
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562 /// will need to keep the same format. |
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563 pub fn v1_data(&self) -> (u8, i32, i32, i32) { |
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564 ( |
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565 self.v1_state().into(), |
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566 self.v1_mode(), |
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567 self.v1_size(), |
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568 self.v1_mtime(), |
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569 ) |
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570 } |
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571 |
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572 pub(crate) fn is_from_other_parent(&self) -> bool { |
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573 self.state() == EntryState::Normal |
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574 && self.size() == SIZE_FROM_OTHER_PARENT |
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575 } |
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576 |
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577 // TODO: other platforms |
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578 #[cfg(unix)] |
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579 pub fn mode_changed( |
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580 &self, |
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581 filesystem_metadata: &std::fs::Metadata, |
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582 ) -> bool { |
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583 use std::os::unix::fs::MetadataExt; |
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584 const EXEC_BIT_MASK: u32 = 0o100; |
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585 let dirstate_exec_bit = (self.mode() as u32) & EXEC_BIT_MASK; |
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586 let fs_exec_bit = filesystem_metadata.mode() & EXEC_BIT_MASK; |
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587 dirstate_exec_bit != fs_exec_bit |
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588 } |
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589 |
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590 /// Returns a `(state, mode, size, mtime)` tuple as for |
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591 /// `DirstateMapMethods::debug_iter`. |
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592 pub fn debug_tuple(&self) -> (u8, i32, i32, i32) { |
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593 (self.state().into(), self.mode(), self.size(), self.mtime()) |
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594 } |
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595 |
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596 /// True if the stored mtime would be ambiguous with the current time |
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597 pub fn need_delay(&self, now: TruncatedTimestamp) -> bool { |
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598 if let Some(mtime) = self.mtime { |
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599 self.state() == EntryState::Normal |
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600 && mtime.truncated_seconds() == now.truncated_seconds() |
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601 } else { |
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602 false |
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603 } |
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604 } |
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605 } |
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606 |
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607 impl EntryState { |
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608 pub fn is_tracked(self) -> bool { |
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609 use EntryState::*; |
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610 match self { |
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611 Normal | Added | Merged => true, |
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612 Removed => false, |
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613 } |
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614 } |
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615 } |
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616 |
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617 impl TryFrom<u8> for EntryState { |
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618 type Error = HgError; |
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619 |
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620 fn try_from(value: u8) -> Result<Self, Self::Error> { |
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621 match value { |
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622 b'n' => Ok(EntryState::Normal), |
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623 b'a' => Ok(EntryState::Added), |
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624 b'r' => Ok(EntryState::Removed), |
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625 b'm' => Ok(EntryState::Merged), |
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626 _ => Err(HgError::CorruptedRepository(format!( |
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627 "Incorrect dirstate entry state {}", |
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628 value |
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629 ))), |
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630 } |
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631 } |
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632 } |
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633 |
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634 impl Into<u8> for EntryState { |
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635 fn into(self) -> u8 { |
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636 match self { |
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637 EntryState::Normal => b'n', |
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638 EntryState::Added => b'a', |
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639 EntryState::Removed => b'r', |
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640 EntryState::Merged => b'm', |
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641 } |
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642 } |
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643 } |