Mercurial > hg
annotate rust/hg-core/src/dirstate/entry.rs @ 48218:15dedc0c5c35
status: Extract TruncatedTimestamp from fs::Metadata without SystemTime
On Unix, the Rust standard library exposes `mtime` and `mtime_nsec` methods
for `std::fs::Metada` whih is exactly what we need to construct a
`TruncatedTimestamp`. This skips the computation in the conversion through
`SystemTime` and `Result<Duration, Duration>`.
Differential Revision: https://phab.mercurial-scm.org/D11654
author | Simon Sapin <simon.sapin@octobus.net> |
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date | Wed, 13 Oct 2021 16:21:39 +0200 |
parents | 1000db4a71f1 |
children | 602c8e8411f5 |
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 /// The C implementation uses all signed types. This will be an issue |
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18 /// either when 4GB+ source files are commonplace or in 2038, whichever |
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19 /// comes first. |
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20 #[derive(Debug, PartialEq, Copy, Clone)] |
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21 pub struct DirstateEntry { |
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22 pub(crate) flags: Flags, |
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23 mode_size: Option<(u32, u32)>, |
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24 mtime: Option<u32>, |
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25 } |
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26 |
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27 bitflags! { |
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28 pub(crate) struct Flags: u8 { |
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29 const WDIR_TRACKED = 1 << 0; |
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30 const P1_TRACKED = 1 << 1; |
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31 const P2_INFO = 1 << 2; |
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32 } |
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33 } |
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34 |
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35 /// A Unix timestamp with nanoseconds precision |
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36 #[derive(Copy, Clone)] |
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37 pub struct TruncatedTimestamp { |
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38 truncated_seconds: u32, |
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39 /// Always in the `0 .. 1_000_000_000` range. |
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40 nanoseconds: u32, |
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41 } |
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42 |
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43 impl TruncatedTimestamp { |
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44 /// Constructs from a timestamp potentially outside of the supported range, |
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45 /// and truncate the seconds components to its lower 31 bits. |
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46 /// |
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47 /// Panics if the nanoseconds components is not in the expected range. |
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48 pub fn new_truncate(seconds: i64, nanoseconds: u32) -> Self { |
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49 assert!(nanoseconds < NSEC_PER_SEC); |
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50 Self { |
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51 truncated_seconds: seconds as u32 & RANGE_MASK_31BIT, |
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52 nanoseconds, |
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53 } |
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54 } |
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55 |
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56 /// Construct from components. Returns an error if they are not in the |
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57 /// expcted range. |
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58 pub fn from_already_truncated( |
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59 truncated_seconds: u32, |
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60 nanoseconds: u32, |
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61 ) -> Result<Self, DirstateV2ParseError> { |
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62 if truncated_seconds & !RANGE_MASK_31BIT == 0 |
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63 && nanoseconds < NSEC_PER_SEC |
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64 { |
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65 Ok(Self { |
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66 truncated_seconds, |
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67 nanoseconds, |
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68 }) |
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69 } else { |
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70 Err(DirstateV2ParseError) |
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71 } |
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72 } |
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73 |
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74 pub fn for_mtime_of(metadata: &fs::Metadata) -> io::Result<Self> { |
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75 #[cfg(unix)] |
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76 { |
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77 use std::os::unix::fs::MetadataExt; |
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78 let seconds = metadata.mtime(); |
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79 // i64Â -> u32 with value always in the `0 .. NSEC_PER_SEC` range |
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80 let nanoseconds = metadata.mtime_nsec().try_into().unwrap(); |
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81 Ok(Self::new_truncate(seconds, nanoseconds)) |
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82 } |
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83 #[cfg(not(unix))] |
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84 { |
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85 metadata.modified().map(Self::from) |
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86 } |
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87 } |
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88 |
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89 /// The lower 31 bits of the number of seconds since the epoch. |
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90 pub fn truncated_seconds(&self) -> u32 { |
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91 self.truncated_seconds |
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92 } |
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93 |
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94 /// The sub-second component of this timestamp, in nanoseconds. |
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95 /// Always in the `0 .. 1_000_000_000` range. |
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96 /// |
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97 /// This timestamp is after `(seconds, 0)` by this many nanoseconds. |
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98 pub fn nanoseconds(&self) -> u32 { |
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99 self.nanoseconds |
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100 } |
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101 |
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102 /// Returns whether two timestamps are equal modulo 2**31 seconds. |
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103 /// |
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104 /// If this returns `true`, the original values converted from `SystemTime` |
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105 /// or given to `new_truncate` were very likely equal. A false positive is |
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106 /// possible if they were exactly a multiple of 2**31 seconds apart (around |
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107 /// 68 years). This is deemed very unlikely to happen by chance, especially |
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108 /// on filesystems that support sub-second precision. |
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109 /// |
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110 /// If someone is manipulating the modification times of some files to |
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111 /// intentionally make `hg status` return incorrect results, not truncating |
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112 /// wouldn’t help much since they can set exactly the expected timestamp. |
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113 pub fn very_likely_equal(self, other: Self) -> bool { |
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114 self.truncated_seconds == other.truncated_seconds |
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115 && self.nanoseconds == other.nanoseconds |
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116 } |
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117 |
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118 pub fn very_likely_equal_to_mtime_of( |
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119 self, |
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120 metadata: &fs::Metadata, |
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121 ) -> io::Result<bool> { |
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122 Ok(self.very_likely_equal(Self::for_mtime_of(metadata)?)) |
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123 } |
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124 } |
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125 |
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126 impl From<SystemTime> for TruncatedTimestamp { |
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127 fn from(system_time: SystemTime) -> Self { |
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128 // On Unix, `SystemTime` is a wrapper for the `timespec` C struct: |
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129 // https://www.gnu.org/software/libc/manual/html_node/Time-Types.html#index-struct-timespec |
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130 // We want to effectively access its fields, but the Rust standard |
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131 // library does not expose them. The best we can do is: |
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132 let seconds; |
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133 let nanoseconds; |
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134 match system_time.duration_since(UNIX_EPOCH) { |
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135 Ok(duration) => { |
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136 seconds = duration.as_secs() as i64; |
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137 nanoseconds = duration.subsec_nanos(); |
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138 } |
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139 Err(error) => { |
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140 // `system_time` is before `UNIX_EPOCH`. |
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141 // We need to undo this algorithm: |
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142 // https://github.com/rust-lang/rust/blob/6bed1f0bc3cc50c10aab26d5f94b16a00776b8a5/library/std/src/sys/unix/time.rs#L40-L41 |
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143 let negative = error.duration(); |
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144 let negative_secs = negative.as_secs() as i64; |
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145 let negative_nanos = negative.subsec_nanos(); |
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146 if negative_nanos == 0 { |
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147 seconds = -negative_secs; |
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148 nanoseconds = 0; |
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149 } else { |
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150 // For example if `system_time` was 4.3Â seconds before |
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151 // the Unix epoch we get a Duration that represents |
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152 // `(-4, -0.3)` but we want `(-5, +0.7)`: |
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153 seconds = -1 - negative_secs; |
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154 nanoseconds = NSEC_PER_SEC - negative_nanos; |
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155 } |
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156 } |
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157 }; |
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158 Self::new_truncate(seconds, nanoseconds) |
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159 } |
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160 } |
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161 |
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162 const NSEC_PER_SEC: u32 = 1_000_000_000; |
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163 const RANGE_MASK_31BIT: u32 = 0x7FFF_FFFF; |
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164 |
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165 pub const MTIME_UNSET: i32 = -1; |
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166 |
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167 /// A `DirstateEntry` with a size of `-2` means that it was merged from the |
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168 /// other parent. This allows revert to pick the right status back during a |
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169 /// merge. |
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170 pub const SIZE_FROM_OTHER_PARENT: i32 = -2; |
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171 /// A special value used for internal representation of special case in |
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172 /// dirstate v1 format. |
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173 pub const SIZE_NON_NORMAL: i32 = -1; |
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174 |
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175 impl DirstateEntry { |
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176 pub fn from_v2_data( |
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177 wdir_tracked: bool, |
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178 p1_tracked: bool, |
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179 p2_info: bool, |
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180 mode_size: Option<(u32, u32)>, |
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181 mtime: Option<u32>, |
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182 ) -> Self { |
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183 if let Some((mode, size)) = mode_size { |
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184 // TODO: return an error for out of range values? |
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185 assert!(mode & !RANGE_MASK_31BIT == 0); |
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186 assert!(size & !RANGE_MASK_31BIT == 0); |
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187 } |
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188 if let Some(mtime) = mtime { |
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189 assert!(mtime & !RANGE_MASK_31BIT == 0); |
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190 } |
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191 let mut flags = Flags::empty(); |
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192 flags.set(Flags::WDIR_TRACKED, wdir_tracked); |
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193 flags.set(Flags::P1_TRACKED, p1_tracked); |
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194 flags.set(Flags::P2_INFO, p2_info); |
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195 Self { |
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196 flags, |
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197 mode_size, |
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198 mtime, |
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199 } |
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200 } |
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201 |
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202 pub fn from_v1_data( |
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203 state: EntryState, |
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204 mode: i32, |
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205 size: i32, |
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206 mtime: i32, |
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207 ) -> Self { |
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208 match state { |
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209 EntryState::Normal => { |
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210 if size == SIZE_FROM_OTHER_PARENT { |
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211 Self { |
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212 // might be missing P1_TRACKED |
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213 flags: Flags::WDIR_TRACKED | Flags::P2_INFO, |
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214 mode_size: None, |
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215 mtime: None, |
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216 } |
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217 } else if size == SIZE_NON_NORMAL { |
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218 Self { |
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219 flags: Flags::WDIR_TRACKED | Flags::P1_TRACKED, |
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220 mode_size: None, |
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221 mtime: None, |
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222 } |
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223 } else if mtime == MTIME_UNSET { |
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224 // TODO:Â return an error for negative values? |
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225 let mode = u32::try_from(mode).unwrap(); |
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226 let size = u32::try_from(size).unwrap(); |
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227 Self { |
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228 flags: Flags::WDIR_TRACKED | Flags::P1_TRACKED, |
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229 mode_size: Some((mode, size)), |
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230 mtime: None, |
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231 } |
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232 } else { |
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233 // TODO:Â return an error for negative values? |
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234 let mode = u32::try_from(mode).unwrap(); |
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235 let size = u32::try_from(size).unwrap(); |
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236 let mtime = u32::try_from(mtime).unwrap(); |
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237 Self { |
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238 flags: Flags::WDIR_TRACKED | Flags::P1_TRACKED, |
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239 mode_size: Some((mode, size)), |
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240 mtime: Some(mtime), |
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241 } |
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242 } |
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243 } |
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244 EntryState::Added => Self { |
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245 flags: Flags::WDIR_TRACKED, |
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246 mode_size: None, |
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247 mtime: None, |
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248 }, |
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249 EntryState::Removed => Self { |
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250 flags: if size == SIZE_NON_NORMAL { |
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251 Flags::P1_TRACKED | Flags::P2_INFO |
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252 } else if size == SIZE_FROM_OTHER_PARENT { |
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253 // We don’t know if P1_TRACKED should be set (file history) |
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254 Flags::P2_INFO |
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255 } else { |
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256 Flags::P1_TRACKED |
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257 }, |
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258 mode_size: None, |
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259 mtime: None, |
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260 }, |
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261 EntryState::Merged => Self { |
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262 flags: Flags::WDIR_TRACKED |
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263 | Flags::P1_TRACKED // might not be true because of rename ? |
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264 | Flags::P2_INFO, // might not be true because of rename ? |
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265 mode_size: None, |
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266 mtime: None, |
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267 }, |
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268 } |
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269 } |
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270 |
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271 /// Creates a new entry in "removed" state. |
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272 /// |
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273 /// `size` is expected to be zero, `SIZE_NON_NORMAL`, or |
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274 /// `SIZE_FROM_OTHER_PARENT` |
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275 pub fn new_removed(size: i32) -> Self { |
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276 Self::from_v1_data(EntryState::Removed, 0, size, 0) |
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277 } |
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278 |
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279 pub fn tracked(&self) -> bool { |
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280 self.flags.contains(Flags::WDIR_TRACKED) |
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281 } |
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282 |
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283 pub fn p1_tracked(&self) -> bool { |
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284 self.flags.contains(Flags::P1_TRACKED) |
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285 } |
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286 |
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287 fn in_either_parent(&self) -> bool { |
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288 self.flags.intersects(Flags::P1_TRACKED | Flags::P2_INFO) |
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289 } |
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290 |
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291 pub fn removed(&self) -> bool { |
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292 self.in_either_parent() && !self.flags.contains(Flags::WDIR_TRACKED) |
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293 } |
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294 |
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295 pub fn p2_info(&self) -> bool { |
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296 self.flags.contains(Flags::WDIR_TRACKED | Flags::P2_INFO) |
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297 } |
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298 |
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299 pub fn added(&self) -> bool { |
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300 self.flags.contains(Flags::WDIR_TRACKED) && !self.in_either_parent() |
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301 } |
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302 |
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303 pub fn maybe_clean(&self) -> bool { |
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304 if !self.flags.contains(Flags::WDIR_TRACKED) { |
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305 false |
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306 } else if !self.flags.contains(Flags::P1_TRACKED) { |
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307 false |
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308 } else if self.flags.contains(Flags::P2_INFO) { |
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309 false |
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310 } else { |
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311 true |
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312 } |
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313 } |
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314 |
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315 pub fn any_tracked(&self) -> bool { |
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316 self.flags.intersects( |
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317 Flags::WDIR_TRACKED | Flags::P1_TRACKED | Flags::P2_INFO, |
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318 ) |
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319 } |
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320 |
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321 /// Returns `(wdir_tracked, p1_tracked, p2_info, mode_size, mtime)` |
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322 pub(crate) fn v2_data( |
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323 &self, |
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324 ) -> (bool, bool, bool, Option<(u32, u32)>, Option<u32>) { |
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325 if !self.any_tracked() { |
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326 // TODO: return an Option instead? |
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327 panic!("Accessing v1_state of an untracked DirstateEntry") |
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328 } |
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329 let wdir_tracked = self.flags.contains(Flags::WDIR_TRACKED); |
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330 let p1_tracked = self.flags.contains(Flags::P1_TRACKED); |
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331 let p2_info = self.flags.contains(Flags::P2_INFO); |
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332 let mode_size = self.mode_size; |
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333 let mtime = self.mtime; |
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334 (wdir_tracked, p1_tracked, p2_info, mode_size, mtime) |
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335 } |
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336 |
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337 fn v1_state(&self) -> EntryState { |
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338 if !self.any_tracked() { |
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339 // TODO: return an Option instead? |
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340 panic!("Accessing v1_state of an untracked DirstateEntry") |
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341 } |
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342 if self.removed() { |
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343 EntryState::Removed |
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344 } else if self |
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345 .flags |
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346 .contains(Flags::WDIR_TRACKED | Flags::P1_TRACKED | Flags::P2_INFO) |
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347 { |
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348 EntryState::Merged |
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349 } else if self.added() { |
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350 EntryState::Added |
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351 } else { |
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352 EntryState::Normal |
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353 } |
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354 } |
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355 |
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356 fn v1_mode(&self) -> i32 { |
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357 if let Some((mode, _size)) = self.mode_size { |
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358 i32::try_from(mode).unwrap() |
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359 } else { |
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360 0 |
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361 } |
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362 } |
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363 |
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364 fn v1_size(&self) -> i32 { |
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365 if !self.any_tracked() { |
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366 // TODO: return an Option instead? |
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367 panic!("Accessing v1_size of an untracked DirstateEntry") |
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368 } |
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369 if self.removed() |
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370 && self.flags.contains(Flags::P1_TRACKED | Flags::P2_INFO) |
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371 { |
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372 SIZE_NON_NORMAL |
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373 } else if self.flags.contains(Flags::P2_INFO) { |
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374 SIZE_FROM_OTHER_PARENT |
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375 } else if self.removed() { |
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376 0 |
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377 } else if self.added() { |
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378 SIZE_NON_NORMAL |
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379 } else if let Some((_mode, size)) = self.mode_size { |
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380 i32::try_from(size).unwrap() |
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381 } else { |
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382 SIZE_NON_NORMAL |
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383 } |
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384 } |
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385 |
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386 fn v1_mtime(&self) -> i32 { |
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387 if !self.any_tracked() { |
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388 // TODO: return an Option instead? |
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389 panic!("Accessing v1_mtime of an untracked DirstateEntry") |
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390 } |
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391 if self.removed() { |
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392 0 |
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393 } else if self.flags.contains(Flags::P2_INFO) { |
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394 MTIME_UNSET |
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395 } else if !self.flags.contains(Flags::P1_TRACKED) { |
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396 MTIME_UNSET |
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397 } else if let Some(mtime) = self.mtime { |
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398 i32::try_from(mtime).unwrap() |
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399 } else { |
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400 MTIME_UNSET |
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401 } |
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402 } |
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403 |
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404 // TODO: return `Option<EntryState>`? None when `!self.any_tracked` |
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405 pub fn state(&self) -> EntryState { |
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406 self.v1_state() |
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407 } |
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408 |
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409 // TODO: return Option? |
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410 pub fn mode(&self) -> i32 { |
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411 self.v1_mode() |
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412 } |
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413 |
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414 // TODO: return Option? |
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415 pub fn size(&self) -> i32 { |
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416 self.v1_size() |
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417 } |
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418 |
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419 // TODO: return Option? |
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420 pub fn mtime(&self) -> i32 { |
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421 self.v1_mtime() |
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422 } |
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423 |
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424 pub fn drop_merge_data(&mut self) { |
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425 if self.flags.contains(Flags::P2_INFO) { |
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426 self.flags.remove(Flags::P2_INFO); |
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427 self.mode_size = None; |
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428 self.mtime = None; |
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429 } |
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430 } |
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431 |
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432 pub fn set_possibly_dirty(&mut self) { |
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433 self.mtime = None |
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434 } |
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435 |
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436 pub fn set_clean(&mut self, mode: u32, size: u32, mtime: u32) { |
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437 let size = size & RANGE_MASK_31BIT; |
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438 let mtime = mtime & RANGE_MASK_31BIT; |
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439 self.flags.insert(Flags::WDIR_TRACKED | Flags::P1_TRACKED); |
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440 self.mode_size = Some((mode, size)); |
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441 self.mtime = Some(mtime); |
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442 } |
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443 |
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444 pub fn set_tracked(&mut self) { |
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445 self.flags.insert(Flags::WDIR_TRACKED); |
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446 // `set_tracked` is replacing various `normallookup` call. So we mark |
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447 // the files as needing lookup |
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448 // |
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449 // Consider dropping this in the future in favor of something less |
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450 // broad. |
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451 self.mtime = None; |
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452 } |
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453 |
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454 pub fn set_untracked(&mut self) { |
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455 self.flags.remove(Flags::WDIR_TRACKED); |
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456 self.mode_size = None; |
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457 self.mtime = None; |
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458 } |
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459 |
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460 /// Returns `(state, mode, size, mtime)` for the puprose of serialization |
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461 /// in the dirstate-v1 format. |
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462 /// |
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463 /// This includes marker values such as `mtime == -1`. In the future we may |
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464 /// want to not represent these cases that way in memory, but serialization |
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465 /// will need to keep the same format. |
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466 pub fn v1_data(&self) -> (u8, i32, i32, i32) { |
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467 ( |
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468 self.v1_state().into(), |
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469 self.v1_mode(), |
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470 self.v1_size(), |
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471 self.v1_mtime(), |
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472 ) |
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473 } |
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474 |
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475 pub(crate) fn is_from_other_parent(&self) -> bool { |
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476 self.state() == EntryState::Normal |
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477 && self.size() == SIZE_FROM_OTHER_PARENT |
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478 } |
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479 |
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480 // TODO: other platforms |
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481 #[cfg(unix)] |
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482 pub fn mode_changed( |
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483 &self, |
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484 filesystem_metadata: &std::fs::Metadata, |
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485 ) -> bool { |
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486 use std::os::unix::fs::MetadataExt; |
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487 const EXEC_BIT_MASK: u32 = 0o100; |
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488 let dirstate_exec_bit = (self.mode() as u32) & EXEC_BIT_MASK; |
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489 let fs_exec_bit = filesystem_metadata.mode() & EXEC_BIT_MASK; |
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490 dirstate_exec_bit != fs_exec_bit |
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491 } |
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492 |
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493 /// Returns a `(state, mode, size, mtime)` tuple as for |
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494 /// `DirstateMapMethods::debug_iter`. |
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495 pub fn debug_tuple(&self) -> (u8, i32, i32, i32) { |
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496 (self.state().into(), self.mode(), self.size(), self.mtime()) |
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497 } |
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498 |
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499 pub fn mtime_is_ambiguous(&self, now: i32) -> bool { |
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500 self.state() == EntryState::Normal && self.mtime() == now |
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501 } |
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502 |
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503 pub fn clear_ambiguous_mtime(&mut self, now: i32) -> bool { |
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504 let ambiguous = self.mtime_is_ambiguous(now); |
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505 if ambiguous { |
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506 // The file was last modified "simultaneously" with the current |
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507 // write to dirstate (i.e. within the same second for file- |
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508 // systems with a granularity of 1 sec). This commonly happens |
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509 // for at least a couple of files on 'update'. |
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510 // The user could change the file without changing its size |
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511 // within the same second. Invalidate the file's mtime in |
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512 // dirstate, forcing future 'status' calls to compare the |
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513 // contents of the file if the size is the same. This prevents |
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514 // mistakenly treating such files as clean. |
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515 self.set_possibly_dirty() |
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516 } |
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517 ambiguous |
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518 } |
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519 } |
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520 |
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521 impl EntryState { |
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522 pub fn is_tracked(self) -> bool { |
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523 use EntryState::*; |
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524 match self { |
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525 Normal | Added | Merged => true, |
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526 Removed => false, |
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527 } |
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528 } |
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529 } |
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530 |
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531 impl TryFrom<u8> for EntryState { |
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532 type Error = HgError; |
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533 |
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534 fn try_from(value: u8) -> Result<Self, Self::Error> { |
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535 match value { |
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536 b'n' => Ok(EntryState::Normal), |
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537 b'a' => Ok(EntryState::Added), |
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538 b'r' => Ok(EntryState::Removed), |
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539 b'm' => Ok(EntryState::Merged), |
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540 _ => Err(HgError::CorruptedRepository(format!( |
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541 "Incorrect dirstate entry state {}", |
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542 value |
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543 ))), |
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544 } |
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545 } |
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546 } |
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547 |
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548 impl Into<u8> for EntryState { |
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549 fn into(self) -> u8 { |
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550 match self { |
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551 EntryState::Normal => b'n', |
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552 EntryState::Added => b'a', |
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553 EntryState::Removed => b'r', |
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554 EntryState::Merged => b'm', |
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555 } |
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556 } |
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557 } |