Mercurial > hg
annotate rust/hg-core/src/dirstate/entry.rs @ 49138:c6c1caf28349
rust-dirstate-entry: add `modified` method
This will also be used in other places later in the series.
Differential Revision: https://phab.mercurial-scm.org/D12536
author | Raphaël Gomès <rgomes@octobus.net> |
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date | Tue, 12 Apr 2022 17:29:21 +0200 |
parents | dd0430434ce9 |
children | 7241b3721ba5 |
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 /// Returns a `TruncatedTimestamp` for the modification time of `metadata`. |
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91 /// |
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92 /// Propagates errors from `std` on platforms where modification time |
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93 /// is not available at all. |
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94 pub fn for_mtime_of(metadata: &fs::Metadata) -> io::Result<Self> { |
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95 #[cfg(unix)] |
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96 { |
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97 use std::os::unix::fs::MetadataExt; |
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98 let seconds = metadata.mtime(); |
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99 // i64Â -> u32 with value always in the `0 .. NSEC_PER_SEC` range |
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100 let nanoseconds = metadata.mtime_nsec().try_into().unwrap(); |
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101 Ok(Self::new_truncate(seconds, nanoseconds, false)) |
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102 } |
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103 #[cfg(not(unix))] |
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104 { |
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105 metadata.modified().map(Self::from) |
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106 } |
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107 } |
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108 |
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109 /// Like `for_mtime_of`, but may return `None` or a value with |
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110 /// `second_ambiguous` set if the mtime is not "reliable". |
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111 /// |
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112 /// A modification time is reliable if it is older than `boundary` (or |
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113 /// sufficiently in the future). |
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114 /// |
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115 /// Otherwise a concurrent modification might happens with the same mtime. |
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116 pub fn for_reliable_mtime_of( |
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117 metadata: &fs::Metadata, |
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118 boundary: &Self, |
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119 ) -> io::Result<Option<Self>> { |
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120 let mut mtime = Self::for_mtime_of(metadata)?; |
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121 // If the mtime of the ambiguous file is younger (or equal) to the |
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122 // starting point of the `status` walk, we cannot garantee that |
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123 // another, racy, write will not happen right after with the same mtime |
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124 // and we cannot cache the information. |
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125 // |
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126 // However if the mtime is far away in the future, this is likely some |
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127 // mismatch between the current clock and previous file system |
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128 // operation. So mtime more than one days in the future are considered |
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129 // fine. |
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130 let reliable = if mtime.truncated_seconds == boundary.truncated_seconds |
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131 { |
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132 mtime.second_ambiguous = true; |
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133 mtime.nanoseconds != 0 |
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134 && boundary.nanoseconds != 0 |
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135 && mtime.nanoseconds < boundary.nanoseconds |
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136 } else { |
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137 // `truncated_seconds` is less than 2**31, |
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138 // so this does not overflow `u32`: |
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139 let one_day_later = boundary.truncated_seconds + 24 * 3600; |
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140 mtime.truncated_seconds < boundary.truncated_seconds |
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141 || mtime.truncated_seconds > one_day_later |
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142 }; |
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143 if reliable { |
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144 Ok(Some(mtime)) |
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145 } else { |
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146 Ok(None) |
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147 } |
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148 } |
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149 |
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150 /// The lower 31 bits of the number of seconds since the epoch. |
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151 pub fn truncated_seconds(&self) -> u32 { |
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152 self.truncated_seconds |
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153 } |
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154 |
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155 /// The sub-second component of this timestamp, in nanoseconds. |
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156 /// Always in the `0 .. 1_000_000_000` range. |
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157 /// |
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158 /// This timestamp is after `(seconds, 0)` by this many nanoseconds. |
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159 pub fn nanoseconds(&self) -> u32 { |
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160 self.nanoseconds |
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161 } |
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162 |
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163 /// Returns whether two timestamps are equal modulo 2**31 seconds. |
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164 /// |
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165 /// If this returns `true`, the original values converted from `SystemTime` |
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166 /// or given to `new_truncate` were very likely equal. A false positive is |
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167 /// possible if they were exactly a multiple of 2**31 seconds apart (around |
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168 /// 68 years). This is deemed very unlikely to happen by chance, especially |
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169 /// on filesystems that support sub-second precision. |
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170 /// |
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171 /// If someone is manipulating the modification times of some files to |
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172 /// intentionally make `hg status` return incorrect results, not truncating |
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173 /// wouldn’t help much since they can set exactly the expected timestamp. |
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174 /// |
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175 /// Sub-second precision is ignored if it is zero in either value. |
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176 /// Some APIs simply return zero when more precision is not available. |
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177 /// When comparing values from different sources, if only one is truncated |
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178 /// in that way, doing a simple comparison would cause many false |
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179 /// negatives. |
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180 pub fn likely_equal(self, other: Self) -> bool { |
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181 if self.truncated_seconds != other.truncated_seconds { |
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182 false |
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183 } else if self.nanoseconds == 0 || other.nanoseconds == 0 { |
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184 if self.second_ambiguous { |
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185 false |
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186 } else { |
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187 true |
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188 } |
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189 } else { |
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190 self.nanoseconds == other.nanoseconds |
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191 } |
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192 } |
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193 |
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194 pub fn likely_equal_to_mtime_of( |
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195 self, |
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196 metadata: &fs::Metadata, |
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197 ) -> io::Result<bool> { |
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198 Ok(self.likely_equal(Self::for_mtime_of(metadata)?)) |
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199 } |
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200 } |
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201 |
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202 impl From<SystemTime> for TruncatedTimestamp { |
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203 fn from(system_time: SystemTime) -> Self { |
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204 // On Unix, `SystemTime` is a wrapper for the `timespec` C struct: |
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205 // https://www.gnu.org/software/libc/manual/html_node/Time-Types.html#index-struct-timespec |
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206 // We want to effectively access its fields, but the Rust standard |
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207 // library does not expose them. The best we can do is: |
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208 let seconds; |
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209 let nanoseconds; |
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210 match system_time.duration_since(UNIX_EPOCH) { |
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211 Ok(duration) => { |
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212 seconds = duration.as_secs() as i64; |
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213 nanoseconds = duration.subsec_nanos(); |
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214 } |
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215 Err(error) => { |
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216 // `system_time` is before `UNIX_EPOCH`. |
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217 // We need to undo this algorithm: |
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218 // https://github.com/rust-lang/rust/blob/6bed1f0bc3cc50c10aab26d5f94b16a00776b8a5/library/std/src/sys/unix/time.rs#L40-L41 |
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219 let negative = error.duration(); |
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220 let negative_secs = negative.as_secs() as i64; |
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221 let negative_nanos = negative.subsec_nanos(); |
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222 if negative_nanos == 0 { |
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223 seconds = -negative_secs; |
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224 nanoseconds = 0; |
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225 } else { |
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226 // For example if `system_time` was 4.3Â seconds before |
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227 // the Unix epoch we get a Duration that represents |
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228 // `(-4, -0.3)` but we want `(-5, +0.7)`: |
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229 seconds = -1 - negative_secs; |
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230 nanoseconds = NSEC_PER_SEC - negative_nanos; |
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231 } |
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232 } |
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233 }; |
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234 Self::new_truncate(seconds, nanoseconds, false) |
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235 } |
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236 } |
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237 |
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238 const NSEC_PER_SEC: u32 = 1_000_000_000; |
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239 pub const RANGE_MASK_31BIT: u32 = 0x7FFF_FFFF; |
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240 |
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241 pub const MTIME_UNSET: i32 = -1; |
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242 |
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243 /// A `DirstateEntry` with a size of `-2` means that it was merged from the |
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244 /// other parent. This allows revert to pick the right status back during a |
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245 /// merge. |
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246 pub const SIZE_FROM_OTHER_PARENT: i32 = -2; |
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247 /// A special value used for internal representation of special case in |
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248 /// dirstate v1 format. |
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249 pub const SIZE_NON_NORMAL: i32 = -1; |
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250 |
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251 #[derive(Debug, Default, Copy, Clone)] |
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252 pub struct DirstateV2Data { |
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253 pub wc_tracked: bool, |
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254 pub p1_tracked: bool, |
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255 pub p2_info: bool, |
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256 pub mode_size: Option<(u32, u32)>, |
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257 pub mtime: Option<TruncatedTimestamp>, |
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258 pub fallback_exec: Option<bool>, |
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259 pub fallback_symlink: Option<bool>, |
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260 } |
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261 |
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262 #[derive(Debug, Default, Copy, Clone)] |
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263 pub struct ParentFileData { |
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264 pub mode_size: Option<(u32, u32)>, |
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265 pub mtime: Option<TruncatedTimestamp>, |
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266 } |
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267 |
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268 impl DirstateEntry { |
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269 pub fn from_v2_data(v2_data: DirstateV2Data) -> Self { |
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270 let DirstateV2Data { |
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271 wc_tracked, |
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272 p1_tracked, |
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273 p2_info, |
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274 mode_size, |
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275 mtime, |
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276 fallback_exec, |
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277 fallback_symlink, |
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278 } = v2_data; |
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279 if let Some((mode, size)) = mode_size { |
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280 // TODO: return an error for out of range values? |
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281 assert!(mode & !RANGE_MASK_31BIT == 0); |
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282 assert!(size & !RANGE_MASK_31BIT == 0); |
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283 } |
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284 let mut flags = Flags::empty(); |
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285 flags.set(Flags::WDIR_TRACKED, wc_tracked); |
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286 flags.set(Flags::P1_TRACKED, p1_tracked); |
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287 flags.set(Flags::P2_INFO, p2_info); |
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288 if let Some(exec) = fallback_exec { |
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289 flags.insert(Flags::HAS_FALLBACK_EXEC); |
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290 if exec { |
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291 flags.insert(Flags::FALLBACK_EXEC); |
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292 } |
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293 } |
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294 if let Some(exec) = fallback_symlink { |
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295 flags.insert(Flags::HAS_FALLBACK_SYMLINK); |
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296 if exec { |
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297 flags.insert(Flags::FALLBACK_SYMLINK); |
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298 } |
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299 } |
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300 Self { |
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301 flags, |
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302 mode_size, |
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303 mtime, |
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304 } |
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305 } |
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306 |
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307 pub fn from_v1_data( |
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308 state: EntryState, |
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309 mode: i32, |
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310 size: i32, |
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311 mtime: i32, |
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312 ) -> Self { |
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313 match state { |
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314 EntryState::Normal => { |
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315 if size == SIZE_FROM_OTHER_PARENT { |
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316 Self { |
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317 // might be missing P1_TRACKED |
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318 flags: Flags::WDIR_TRACKED | Flags::P2_INFO, |
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319 mode_size: None, |
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320 mtime: None, |
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321 } |
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322 } else if size == SIZE_NON_NORMAL { |
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323 Self { |
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324 flags: Flags::WDIR_TRACKED | Flags::P1_TRACKED, |
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325 mode_size: None, |
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326 mtime: None, |
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327 } |
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328 } else if mtime == MTIME_UNSET { |
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329 // TODO:Â return an error for negative values? |
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330 let mode = u32::try_from(mode).unwrap(); |
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331 let size = u32::try_from(size).unwrap(); |
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332 Self { |
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333 flags: Flags::WDIR_TRACKED | Flags::P1_TRACKED, |
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334 mode_size: Some((mode, size)), |
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335 mtime: None, |
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336 } |
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337 } else { |
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338 // TODO:Â return an error for negative values? |
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339 let mode = u32::try_from(mode).unwrap(); |
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340 let size = u32::try_from(size).unwrap(); |
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341 let mtime = u32::try_from(mtime).unwrap(); |
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342 let mtime = TruncatedTimestamp::from_already_truncated( |
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343 mtime, 0, false, |
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344 ) |
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345 .unwrap(); |
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346 Self { |
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347 flags: Flags::WDIR_TRACKED | Flags::P1_TRACKED, |
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348 mode_size: Some((mode, size)), |
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349 mtime: Some(mtime), |
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350 } |
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351 } |
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352 } |
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353 EntryState::Added => Self { |
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354 flags: Flags::WDIR_TRACKED, |
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355 mode_size: None, |
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356 mtime: None, |
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357 }, |
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358 EntryState::Removed => Self { |
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359 flags: if size == SIZE_NON_NORMAL { |
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360 Flags::P1_TRACKED | Flags::P2_INFO |
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361 } else if size == SIZE_FROM_OTHER_PARENT { |
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362 // We don’t know if P1_TRACKED should be set (file history) |
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363 Flags::P2_INFO |
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364 } else { |
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365 Flags::P1_TRACKED |
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366 }, |
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367 mode_size: None, |
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368 mtime: None, |
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369 }, |
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370 EntryState::Merged => Self { |
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371 flags: Flags::WDIR_TRACKED |
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372 | Flags::P1_TRACKED // might not be true because of rename ? |
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373 | Flags::P2_INFO, // might not be true because of rename ? |
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374 mode_size: None, |
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375 mtime: None, |
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376 }, |
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377 } |
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378 } |
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379 |
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380 /// Creates a new entry in "removed" state. |
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381 /// |
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382 /// `size` is expected to be zero, `SIZE_NON_NORMAL`, or |
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383 /// `SIZE_FROM_OTHER_PARENT` |
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384 pub fn new_removed(size: i32) -> Self { |
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385 Self::from_v1_data(EntryState::Removed, 0, size, 0) |
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386 } |
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387 |
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388 pub fn new_tracked() -> Self { |
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389 let data = DirstateV2Data { |
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390 wc_tracked: true, |
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391 ..Default::default() |
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392 }; |
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393 Self::from_v2_data(data) |
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394 } |
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395 |
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396 pub fn tracked(&self) -> bool { |
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397 self.flags.contains(Flags::WDIR_TRACKED) |
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398 } |
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399 |
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400 pub fn p1_tracked(&self) -> bool { |
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401 self.flags.contains(Flags::P1_TRACKED) |
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402 } |
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403 |
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404 fn in_either_parent(&self) -> bool { |
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405 self.flags.intersects(Flags::P1_TRACKED | Flags::P2_INFO) |
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406 } |
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407 |
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408 pub fn removed(&self) -> bool { |
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409 self.in_either_parent() && !self.flags.contains(Flags::WDIR_TRACKED) |
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410 } |
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411 |
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412 pub fn p2_info(&self) -> bool { |
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413 self.flags.contains(Flags::WDIR_TRACKED | Flags::P2_INFO) |
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414 } |
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415 |
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416 pub fn added(&self) -> bool { |
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417 self.flags.contains(Flags::WDIR_TRACKED) && !self.in_either_parent() |
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418 } |
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419 |
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420 pub fn modified(&self) -> bool { |
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421 self.flags |
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422 .contains(Flags::WDIR_TRACKED | Flags::P1_TRACKED | Flags::P2_INFO) |
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423 } |
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424 |
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425 pub fn maybe_clean(&self) -> bool { |
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426 if !self.flags.contains(Flags::WDIR_TRACKED) { |
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427 false |
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428 } else if !self.flags.contains(Flags::P1_TRACKED) { |
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429 false |
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430 } else if self.flags.contains(Flags::P2_INFO) { |
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431 false |
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432 } else { |
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433 true |
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434 } |
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435 } |
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436 |
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437 pub fn any_tracked(&self) -> bool { |
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438 self.flags.intersects( |
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439 Flags::WDIR_TRACKED | Flags::P1_TRACKED | Flags::P2_INFO, |
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440 ) |
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441 } |
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442 |
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443 pub(crate) fn v2_data(&self) -> DirstateV2Data { |
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444 if !self.any_tracked() { |
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445 // TODO: return an Option instead? |
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446 panic!("Accessing v2_data of an untracked DirstateEntry") |
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447 } |
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448 let wc_tracked = self.flags.contains(Flags::WDIR_TRACKED); |
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449 let p1_tracked = self.flags.contains(Flags::P1_TRACKED); |
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450 let p2_info = self.flags.contains(Flags::P2_INFO); |
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451 let mode_size = self.mode_size; |
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452 let mtime = self.mtime; |
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453 DirstateV2Data { |
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454 wc_tracked, |
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455 p1_tracked, |
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456 p2_info, |
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457 mode_size, |
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458 mtime, |
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459 fallback_exec: self.get_fallback_exec(), |
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460 fallback_symlink: self.get_fallback_symlink(), |
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461 } |
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462 } |
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463 |
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464 fn v1_state(&self) -> EntryState { |
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465 if !self.any_tracked() { |
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466 // TODO: return an Option instead? |
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467 panic!("Accessing v1_state of an untracked DirstateEntry") |
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468 } |
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469 if self.removed() { |
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470 EntryState::Removed |
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471 } else if self.modified() { |
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472 EntryState::Merged |
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473 } else if self.added() { |
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474 EntryState::Added |
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475 } else { |
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476 EntryState::Normal |
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477 } |
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478 } |
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479 |
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480 fn v1_mode(&self) -> i32 { |
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481 if let Some((mode, _size)) = self.mode_size { |
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482 i32::try_from(mode).unwrap() |
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483 } else { |
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484 0 |
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485 } |
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486 } |
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487 |
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488 fn v1_size(&self) -> i32 { |
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489 if !self.any_tracked() { |
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490 // TODO: return an Option instead? |
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491 panic!("Accessing v1_size of an untracked DirstateEntry") |
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492 } |
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493 if self.removed() |
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494 && self.flags.contains(Flags::P1_TRACKED | Flags::P2_INFO) |
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495 { |
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496 SIZE_NON_NORMAL |
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497 } else if self.flags.contains(Flags::P2_INFO) { |
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498 SIZE_FROM_OTHER_PARENT |
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499 } else if self.removed() { |
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500 0 |
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501 } else if self.added() { |
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502 SIZE_NON_NORMAL |
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503 } else if let Some((_mode, size)) = self.mode_size { |
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504 i32::try_from(size).unwrap() |
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505 } else { |
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506 SIZE_NON_NORMAL |
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507 } |
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508 } |
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509 |
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510 fn v1_mtime(&self) -> i32 { |
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511 if !self.any_tracked() { |
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512 // TODO: return an Option instead? |
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513 panic!("Accessing v1_mtime of an untracked DirstateEntry") |
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514 } |
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515 if self.removed() { |
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516 0 |
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517 } else if self.flags.contains(Flags::P2_INFO) { |
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518 MTIME_UNSET |
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519 } else if !self.flags.contains(Flags::P1_TRACKED) { |
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520 MTIME_UNSET |
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521 } else if let Some(mtime) = self.mtime { |
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522 if mtime.second_ambiguous { |
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523 MTIME_UNSET |
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524 } else { |
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525 i32::try_from(mtime.truncated_seconds()).unwrap() |
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526 } |
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527 } else { |
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528 MTIME_UNSET |
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529 } |
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530 } |
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531 |
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532 // TODO: return `Option<EntryState>`? None when `!self.any_tracked` |
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533 pub fn state(&self) -> EntryState { |
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534 self.v1_state() |
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535 } |
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536 |
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537 // TODO: return Option? |
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538 pub fn mode(&self) -> i32 { |
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539 self.v1_mode() |
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540 } |
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541 |
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542 // TODO: return Option? |
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543 pub fn size(&self) -> i32 { |
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544 self.v1_size() |
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545 } |
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546 |
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547 // TODO: return Option? |
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548 pub fn mtime(&self) -> i32 { |
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549 self.v1_mtime() |
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550 } |
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551 |
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552 pub fn get_fallback_exec(&self) -> Option<bool> { |
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553 if self.flags.contains(Flags::HAS_FALLBACK_EXEC) { |
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554 Some(self.flags.contains(Flags::FALLBACK_EXEC)) |
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555 } else { |
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556 None |
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557 } |
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558 } |
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559 |
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560 pub fn set_fallback_exec(&mut self, value: Option<bool>) { |
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561 match value { |
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562 None => { |
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563 self.flags.remove(Flags::HAS_FALLBACK_EXEC); |
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564 self.flags.remove(Flags::FALLBACK_EXEC); |
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565 } |
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566 Some(exec) => { |
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567 self.flags.insert(Flags::HAS_FALLBACK_EXEC); |
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568 if exec { |
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569 self.flags.insert(Flags::FALLBACK_EXEC); |
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570 } |
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571 } |
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572 } |
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573 } |
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574 |
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575 pub fn get_fallback_symlink(&self) -> Option<bool> { |
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576 if self.flags.contains(Flags::HAS_FALLBACK_SYMLINK) { |
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577 Some(self.flags.contains(Flags::FALLBACK_SYMLINK)) |
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578 } else { |
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579 None |
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580 } |
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581 } |
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582 |
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583 pub fn set_fallback_symlink(&mut self, value: Option<bool>) { |
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584 match value { |
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585 None => { |
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586 self.flags.remove(Flags::HAS_FALLBACK_SYMLINK); |
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587 self.flags.remove(Flags::FALLBACK_SYMLINK); |
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588 } |
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589 Some(symlink) => { |
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590 self.flags.insert(Flags::HAS_FALLBACK_SYMLINK); |
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591 if symlink { |
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592 self.flags.insert(Flags::FALLBACK_SYMLINK); |
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593 } |
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594 } |
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595 } |
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596 } |
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597 |
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598 pub fn truncated_mtime(&self) -> Option<TruncatedTimestamp> { |
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599 self.mtime |
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600 } |
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601 |
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602 pub fn drop_merge_data(&mut self) { |
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603 if self.flags.contains(Flags::P2_INFO) { |
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604 self.flags.remove(Flags::P2_INFO); |
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605 self.mode_size = None; |
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606 self.mtime = None; |
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607 } |
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608 } |
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609 |
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610 pub fn set_possibly_dirty(&mut self) { |
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611 self.mtime = None |
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612 } |
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613 |
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614 pub fn set_clean( |
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615 &mut self, |
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616 mode: u32, |
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617 size: u32, |
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618 mtime: TruncatedTimestamp, |
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619 ) { |
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620 let size = size & RANGE_MASK_31BIT; |
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621 self.flags.insert(Flags::WDIR_TRACKED | Flags::P1_TRACKED); |
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622 self.mode_size = Some((mode, size)); |
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623 self.mtime = Some(mtime); |
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624 } |
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625 |
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626 pub fn set_tracked(&mut self) { |
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627 self.flags.insert(Flags::WDIR_TRACKED); |
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628 // `set_tracked` is replacing various `normallookup` call. So we mark |
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629 // the files as needing lookup |
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630 // |
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631 // Consider dropping this in the future in favor of something less |
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632 // broad. |
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633 self.mtime = None; |
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634 } |
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635 |
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636 pub fn set_untracked(&mut self) { |
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637 self.flags.remove(Flags::WDIR_TRACKED); |
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638 self.mode_size = None; |
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639 self.mtime = None; |
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640 } |
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641 |
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642 /// Returns `(state, mode, size, mtime)` for the puprose of serialization |
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643 /// in the dirstate-v1 format. |
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644 /// |
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645 /// This includes marker values such as `mtime == -1`. In the future we may |
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646 /// want to not represent these cases that way in memory, but serialization |
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647 /// will need to keep the same format. |
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648 pub fn v1_data(&self) -> (u8, i32, i32, i32) { |
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649 ( |
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650 self.v1_state().into(), |
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651 self.v1_mode(), |
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652 self.v1_size(), |
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653 self.v1_mtime(), |
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654 ) |
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655 } |
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656 |
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657 pub(crate) fn is_from_other_parent(&self) -> bool { |
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658 self.state() == EntryState::Normal |
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659 && self.size() == SIZE_FROM_OTHER_PARENT |
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660 } |
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661 |
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662 // TODO: other platforms |
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663 #[cfg(unix)] |
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664 pub fn mode_changed( |
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665 &self, |
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666 filesystem_metadata: &std::fs::Metadata, |
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667 ) -> bool { |
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668 let dirstate_exec_bit = (self.mode() as u32 & EXEC_BIT_MASK) != 0; |
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669 let fs_exec_bit = has_exec_bit(filesystem_metadata); |
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670 dirstate_exec_bit != fs_exec_bit |
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671 } |
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672 |
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673 /// Returns a `(state, mode, size, mtime)` tuple as for |
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674 /// `DirstateMapMethods::debug_iter`. |
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675 pub fn debug_tuple(&self) -> (u8, i32, i32, i32) { |
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676 (self.state().into(), self.mode(), self.size(), self.mtime()) |
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677 } |
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678 } |
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679 |
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680 impl EntryState { |
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681 pub fn is_tracked(self) -> bool { |
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682 use EntryState::*; |
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683 match self { |
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684 Normal | Added | Merged => true, |
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685 Removed => false, |
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686 } |
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687 } |
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688 } |
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689 |
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690 impl TryFrom<u8> for EntryState { |
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691 type Error = HgError; |
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692 |
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693 fn try_from(value: u8) -> Result<Self, Self::Error> { |
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694 match value { |
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695 b'n' => Ok(EntryState::Normal), |
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696 b'a' => Ok(EntryState::Added), |
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697 b'r' => Ok(EntryState::Removed), |
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698 b'm' => Ok(EntryState::Merged), |
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699 _ => Err(HgError::CorruptedRepository(format!( |
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700 "Incorrect dirstate entry state {}", |
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701 value |
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702 ))), |
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703 } |
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704 } |
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705 } |
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706 |
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707 impl Into<u8> for EntryState { |
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708 fn into(self) -> u8 { |
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709 match self { |
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710 EntryState::Normal => b'n', |
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711 EntryState::Added => b'a', |
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712 EntryState::Removed => b'r', |
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713 EntryState::Merged => b'm', |
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714 } |
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715 } |
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716 } |
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717 |
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718 const EXEC_BIT_MASK: u32 = 0o100; |
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719 |
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720 pub fn has_exec_bit(metadata: &std::fs::Metadata) -> bool { |
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721 // TODO: How to handle executable permissions on Windows? |
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722 use std::os::unix::fs::MetadataExt; |
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723 (metadata.mode() & EXEC_BIT_MASK) != 0 |
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724 } |