Mercurial > hg
annotate rust/hg-core/src/dirstate/entry.rs @ 48192:d2f760c2c91c
dirstate-v2: Separate Rust structs for Timestamp and PackedTimestamp
PackedTimestamp is now exclusively for dirstate-v2 serialization purpose.
It contains unaligned big-endian integers. Timestamp is used everywhere else
and contains native Rust integers.
Differential Revision: https://phab.mercurial-scm.org/D11632
author | Simon Sapin <simon.sapin@octobus.net> |
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date | Tue, 12 Oct 2021 16:20:05 +0200 |
parents | 1ab4523afe12 |
children | 320de901896a |
rev | line source |
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1 use crate::errors::HgError; |
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2 use bitflags::bitflags; |
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3 use std::convert::TryFrom; |
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4 use std::time::{SystemTime, UNIX_EPOCH}; |
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5 |
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6 #[derive(Copy, Clone, Debug, Eq, PartialEq)] |
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7 pub enum EntryState { |
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8 Normal, |
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9 Added, |
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10 Removed, |
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11 Merged, |
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12 } |
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13 |
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14 /// The C implementation uses all signed types. This will be an issue |
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15 /// either when 4GB+ source files are commonplace or in 2038, whichever |
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16 /// comes first. |
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17 #[derive(Debug, PartialEq, Copy, Clone)] |
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18 pub struct DirstateEntry { |
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19 pub(crate) flags: Flags, |
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20 mode_size: Option<(i32, i32)>, |
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21 mtime: Option<i32>, |
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22 } |
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23 |
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24 bitflags! { |
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25 pub(crate) struct Flags: u8 { |
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26 const WDIR_TRACKED = 1 << 0; |
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27 const P1_TRACKED = 1 << 1; |
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28 const P2_INFO = 1 << 2; |
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29 } |
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30 } |
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31 |
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32 #[derive(Copy, Clone, PartialEq)] |
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33 pub struct Timestamp { |
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34 seconds: i64, |
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35 |
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36 /// In `0 .. 1_000_000_000`. |
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37 /// |
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38 /// This timestamp is after `(seconds, 0)` by this many nanoseconds. |
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39 nanoseconds: u32, |
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40 } |
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41 |
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42 impl Timestamp { |
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43 pub fn new(seconds: i64, nanoseconds: u32) -> Self { |
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44 Self { |
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45 seconds, |
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46 nanoseconds, |
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47 } |
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48 } |
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49 |
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50 pub fn seconds(&self) -> i64 { |
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51 self.seconds |
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52 } |
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53 |
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54 pub fn nanoseconds(&self) -> u32 { |
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55 self.nanoseconds |
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56 } |
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57 } |
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58 |
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59 impl From<SystemTime> for Timestamp { |
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60 fn from(system_time: SystemTime) -> Self { |
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61 // On Unix, `SystemTime` is a wrapper for the `timespec` C struct: |
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62 // https://www.gnu.org/software/libc/manual/html_node/Time-Types.html#index-struct-timespec |
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63 // We want to effectively access its fields, but the Rust standard |
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64 // library does not expose them. The best we can do is: |
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65 let seconds; |
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66 let nanoseconds; |
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67 match system_time.duration_since(UNIX_EPOCH) { |
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68 Ok(duration) => { |
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69 seconds = duration.as_secs() as i64; |
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70 nanoseconds = duration.subsec_nanos(); |
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71 } |
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72 Err(error) => { |
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73 // `system_time` is before `UNIX_EPOCH`. |
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74 // We need to undo this algorithm: |
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75 // https://github.com/rust-lang/rust/blob/6bed1f0bc3cc50c10aab26d5f94b16a00776b8a5/library/std/src/sys/unix/time.rs#L40-L41 |
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76 let negative = error.duration(); |
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77 let negative_secs = negative.as_secs() as i64; |
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78 let negative_nanos = negative.subsec_nanos(); |
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79 if negative_nanos == 0 { |
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80 seconds = -negative_secs; |
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81 nanoseconds = 0; |
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82 } else { |
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83 // For example if `system_time` was 4.3Â seconds before |
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84 // the Unix epoch we get a Duration that represents |
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85 // `(-4, -0.3)` but we want `(-5, +0.7)`: |
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86 const NSEC_PER_SEC: u32 = 1_000_000_000; |
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87 seconds = -1 - negative_secs; |
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88 nanoseconds = NSEC_PER_SEC - negative_nanos; |
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89 } |
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90 } |
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91 }; |
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92 Self { |
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93 seconds, |
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94 nanoseconds, |
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95 } |
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96 } |
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97 } |
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98 |
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99 pub const V1_RANGEMASK: i32 = 0x7FFFFFFF; |
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100 |
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101 pub const MTIME_UNSET: i32 = -1; |
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102 |
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103 /// A `DirstateEntry` with a size of `-2` means that it was merged from the |
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104 /// other parent. This allows revert to pick the right status back during a |
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105 /// merge. |
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106 pub const SIZE_FROM_OTHER_PARENT: i32 = -2; |
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107 /// A special value used for internal representation of special case in |
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108 /// dirstate v1 format. |
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109 pub const SIZE_NON_NORMAL: i32 = -1; |
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110 |
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111 impl DirstateEntry { |
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112 pub fn from_v2_data( |
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113 wdir_tracked: bool, |
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114 p1_tracked: bool, |
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115 p2_info: bool, |
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116 mode_size: Option<(i32, i32)>, |
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117 mtime: Option<i32>, |
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118 ) -> Self { |
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119 let mut flags = Flags::empty(); |
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120 flags.set(Flags::WDIR_TRACKED, wdir_tracked); |
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121 flags.set(Flags::P1_TRACKED, p1_tracked); |
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122 flags.set(Flags::P2_INFO, p2_info); |
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123 Self { |
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124 flags, |
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125 mode_size, |
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126 mtime, |
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127 } |
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128 } |
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129 |
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130 pub fn from_v1_data( |
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131 state: EntryState, |
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132 mode: i32, |
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133 size: i32, |
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134 mtime: i32, |
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135 ) -> Self { |
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136 match state { |
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137 EntryState::Normal => { |
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138 if size == SIZE_FROM_OTHER_PARENT { |
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139 Self { |
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140 // might be missing P1_TRACKED |
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141 flags: Flags::WDIR_TRACKED | Flags::P2_INFO, |
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142 mode_size: None, |
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143 mtime: None, |
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144 } |
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145 } else if size == SIZE_NON_NORMAL { |
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146 Self { |
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147 flags: Flags::WDIR_TRACKED | Flags::P1_TRACKED, |
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148 mode_size: None, |
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149 mtime: None, |
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150 } |
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151 } else if mtime == MTIME_UNSET { |
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152 Self { |
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153 flags: Flags::WDIR_TRACKED | Flags::P1_TRACKED, |
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154 mode_size: Some((mode, size)), |
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155 mtime: None, |
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156 } |
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157 } else { |
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158 Self { |
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159 flags: Flags::WDIR_TRACKED | Flags::P1_TRACKED, |
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160 mode_size: Some((mode, size)), |
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161 mtime: Some(mtime), |
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162 } |
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163 } |
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164 } |
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165 EntryState::Added => Self { |
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166 flags: Flags::WDIR_TRACKED, |
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167 mode_size: None, |
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168 mtime: None, |
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169 }, |
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170 EntryState::Removed => Self { |
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171 flags: if size == SIZE_NON_NORMAL { |
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172 Flags::P1_TRACKED | Flags::P2_INFO |
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173 } else if size == SIZE_FROM_OTHER_PARENT { |
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174 // We don’t know if P1_TRACKED should be set (file history) |
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175 Flags::P2_INFO |
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176 } else { |
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177 Flags::P1_TRACKED |
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178 }, |
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179 mode_size: None, |
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180 mtime: None, |
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181 }, |
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182 EntryState::Merged => Self { |
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183 flags: Flags::WDIR_TRACKED |
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184 | Flags::P1_TRACKED // might not be true because of rename ? |
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185 | Flags::P2_INFO, // might not be true because of rename ? |
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186 mode_size: None, |
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187 mtime: None, |
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188 }, |
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189 } |
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190 } |
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191 |
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192 /// Creates a new entry in "removed" state. |
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193 /// |
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194 /// `size` is expected to be zero, `SIZE_NON_NORMAL`, or |
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195 /// `SIZE_FROM_OTHER_PARENT` |
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196 pub fn new_removed(size: i32) -> Self { |
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197 Self::from_v1_data(EntryState::Removed, 0, size, 0) |
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198 } |
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199 |
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200 pub fn tracked(&self) -> bool { |
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201 self.flags.contains(Flags::WDIR_TRACKED) |
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202 } |
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203 |
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204 pub fn p1_tracked(&self) -> bool { |
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205 self.flags.contains(Flags::P1_TRACKED) |
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206 } |
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207 |
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208 fn in_either_parent(&self) -> bool { |
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209 self.flags.intersects(Flags::P1_TRACKED | Flags::P2_INFO) |
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210 } |
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211 |
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212 pub fn removed(&self) -> bool { |
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213 self.in_either_parent() && !self.flags.contains(Flags::WDIR_TRACKED) |
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214 } |
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215 |
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216 pub fn p2_info(&self) -> bool { |
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217 self.flags.contains(Flags::WDIR_TRACKED | Flags::P2_INFO) |
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218 } |
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219 |
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220 pub fn added(&self) -> bool { |
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221 self.flags.contains(Flags::WDIR_TRACKED) && !self.in_either_parent() |
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222 } |
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223 |
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224 pub fn maybe_clean(&self) -> bool { |
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225 if !self.flags.contains(Flags::WDIR_TRACKED) { |
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226 false |
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227 } else if !self.flags.contains(Flags::P1_TRACKED) { |
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228 false |
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229 } else if self.flags.contains(Flags::P2_INFO) { |
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230 false |
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231 } else { |
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232 true |
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233 } |
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234 } |
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235 |
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236 pub fn any_tracked(&self) -> bool { |
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237 self.flags.intersects( |
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238 Flags::WDIR_TRACKED | Flags::P1_TRACKED | Flags::P2_INFO, |
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239 ) |
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240 } |
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241 |
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242 /// Returns `(wdir_tracked, p1_tracked, p2_info, mode_size, mtime)` |
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243 pub(crate) fn v2_data( |
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244 &self, |
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245 ) -> (bool, bool, bool, Option<(i32, i32)>, Option<i32>) { |
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246 if !self.any_tracked() { |
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247 // TODO: return an Option instead? |
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248 panic!("Accessing v1_state of an untracked DirstateEntry") |
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249 } |
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250 let wdir_tracked = self.flags.contains(Flags::WDIR_TRACKED); |
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251 let p1_tracked = self.flags.contains(Flags::P1_TRACKED); |
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252 let p2_info = self.flags.contains(Flags::P2_INFO); |
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253 let mode_size = self.mode_size; |
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254 let mtime = self.mtime; |
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255 (wdir_tracked, p1_tracked, p2_info, mode_size, mtime) |
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256 } |
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257 |
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258 fn v1_state(&self) -> EntryState { |
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259 if !self.any_tracked() { |
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260 // TODO: return an Option instead? |
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261 panic!("Accessing v1_state of an untracked DirstateEntry") |
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262 } |
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263 if self.removed() { |
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264 EntryState::Removed |
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265 } else if self |
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266 .flags |
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267 .contains(Flags::WDIR_TRACKED | Flags::P1_TRACKED | Flags::P2_INFO) |
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268 { |
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269 EntryState::Merged |
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270 } else if self.added() { |
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271 EntryState::Added |
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272 } else { |
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273 EntryState::Normal |
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274 } |
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275 } |
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276 |
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277 fn v1_mode(&self) -> i32 { |
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278 if let Some((mode, _size)) = self.mode_size { |
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279 mode |
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280 } else { |
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281 0 |
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282 } |
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283 } |
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284 |
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285 fn v1_size(&self) -> i32 { |
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286 if !self.any_tracked() { |
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287 // TODO: return an Option instead? |
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288 panic!("Accessing v1_size of an untracked DirstateEntry") |
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289 } |
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290 if self.removed() |
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291 && self.flags.contains(Flags::P1_TRACKED | Flags::P2_INFO) |
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292 { |
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293 SIZE_NON_NORMAL |
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294 } else if self.flags.contains(Flags::P2_INFO) { |
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295 SIZE_FROM_OTHER_PARENT |
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296 } else if self.removed() { |
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297 0 |
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298 } else if self.added() { |
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299 SIZE_NON_NORMAL |
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300 } else if let Some((_mode, size)) = self.mode_size { |
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301 size |
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302 } else { |
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303 SIZE_NON_NORMAL |
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304 } |
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305 } |
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306 |
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307 fn v1_mtime(&self) -> i32 { |
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308 if !self.any_tracked() { |
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309 // TODO: return an Option instead? |
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310 panic!("Accessing v1_mtime of an untracked DirstateEntry") |
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311 } |
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312 if self.removed() { |
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313 0 |
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314 } else if self.flags.contains(Flags::P2_INFO) { |
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315 MTIME_UNSET |
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316 } else if !self.flags.contains(Flags::P1_TRACKED) { |
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317 MTIME_UNSET |
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318 } else { |
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319 self.mtime.unwrap_or(MTIME_UNSET) |
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320 } |
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321 } |
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322 |
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323 // TODO: return `Option<EntryState>`? None when `!self.any_tracked` |
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324 pub fn state(&self) -> EntryState { |
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325 self.v1_state() |
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326 } |
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327 |
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328 // TODO: return Option? |
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329 pub fn mode(&self) -> i32 { |
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330 self.v1_mode() |
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331 } |
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332 |
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333 // TODO: return Option? |
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334 pub fn size(&self) -> i32 { |
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335 self.v1_size() |
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336 } |
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337 |
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338 // TODO: return Option? |
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339 pub fn mtime(&self) -> i32 { |
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340 self.v1_mtime() |
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341 } |
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342 |
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343 pub fn drop_merge_data(&mut self) { |
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344 if self.flags.contains(Flags::P2_INFO) { |
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345 self.flags.remove(Flags::P2_INFO); |
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346 self.mode_size = None; |
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347 self.mtime = None; |
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348 } |
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349 } |
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350 |
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351 pub fn set_possibly_dirty(&mut self) { |
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352 self.mtime = None |
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353 } |
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354 |
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355 pub fn set_clean(&mut self, mode: i32, size: i32, mtime: i32) { |
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356 self.flags.insert(Flags::WDIR_TRACKED | Flags::P1_TRACKED); |
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357 self.mode_size = Some((mode, size)); |
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358 self.mtime = Some(mtime); |
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359 } |
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360 |
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361 pub fn set_tracked(&mut self) { |
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362 self.flags.insert(Flags::WDIR_TRACKED); |
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363 // `set_tracked` is replacing various `normallookup` call. So we mark |
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364 // the files as needing lookup |
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365 // |
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366 // Consider dropping this in the future in favor of something less |
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367 // broad. |
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368 self.mtime = None; |
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369 } |
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370 |
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371 pub fn set_untracked(&mut self) { |
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372 self.flags.remove(Flags::WDIR_TRACKED); |
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373 self.mode_size = None; |
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374 self.mtime = None; |
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375 } |
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376 |
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377 /// Returns `(state, mode, size, mtime)` for the puprose of serialization |
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378 /// in the dirstate-v1 format. |
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379 /// |
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380 /// This includes marker values such as `mtime == -1`. In the future we may |
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381 /// want to not represent these cases that way in memory, but serialization |
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382 /// will need to keep the same format. |
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383 pub fn v1_data(&self) -> (u8, i32, i32, i32) { |
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384 ( |
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385 self.v1_state().into(), |
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386 self.v1_mode(), |
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387 self.v1_size(), |
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388 self.v1_mtime(), |
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389 ) |
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390 } |
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391 |
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392 pub(crate) fn is_from_other_parent(&self) -> bool { |
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393 self.state() == EntryState::Normal |
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394 && self.size() == SIZE_FROM_OTHER_PARENT |
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395 } |
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396 |
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397 // TODO: other platforms |
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398 #[cfg(unix)] |
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399 pub fn mode_changed( |
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400 &self, |
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401 filesystem_metadata: &std::fs::Metadata, |
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402 ) -> bool { |
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403 use std::os::unix::fs::MetadataExt; |
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404 const EXEC_BIT_MASK: u32 = 0o100; |
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405 let dirstate_exec_bit = (self.mode() as u32) & EXEC_BIT_MASK; |
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406 let fs_exec_bit = filesystem_metadata.mode() & EXEC_BIT_MASK; |
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407 dirstate_exec_bit != fs_exec_bit |
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408 } |
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409 |
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410 /// Returns a `(state, mode, size, mtime)` tuple as for |
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411 /// `DirstateMapMethods::debug_iter`. |
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412 pub fn debug_tuple(&self) -> (u8, i32, i32, i32) { |
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413 (self.state().into(), self.mode(), self.size(), self.mtime()) |
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414 } |
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415 |
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416 pub fn mtime_is_ambiguous(&self, now: i32) -> bool { |
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417 self.state() == EntryState::Normal && self.mtime() == now |
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418 } |
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419 |
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420 pub fn clear_ambiguous_mtime(&mut self, now: i32) -> bool { |
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421 let ambiguous = self.mtime_is_ambiguous(now); |
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422 if ambiguous { |
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423 // The file was last modified "simultaneously" with the current |
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424 // write to dirstate (i.e. within the same second for file- |
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425 // systems with a granularity of 1 sec). This commonly happens |
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426 // for at least a couple of files on 'update'. |
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427 // The user could change the file without changing its size |
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428 // within the same second. Invalidate the file's mtime in |
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429 // dirstate, forcing future 'status' calls to compare the |
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430 // contents of the file if the size is the same. This prevents |
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431 // mistakenly treating such files as clean. |
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432 self.set_possibly_dirty() |
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433 } |
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434 ambiguous |
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435 } |
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436 } |
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437 |
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438 impl EntryState { |
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439 pub fn is_tracked(self) -> bool { |
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440 use EntryState::*; |
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441 match self { |
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442 Normal | Added | Merged => true, |
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443 Removed => false, |
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444 } |
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445 } |
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446 } |
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447 |
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448 impl TryFrom<u8> for EntryState { |
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449 type Error = HgError; |
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450 |
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451 fn try_from(value: u8) -> Result<Self, Self::Error> { |
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452 match value { |
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453 b'n' => Ok(EntryState::Normal), |
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454 b'a' => Ok(EntryState::Added), |
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455 b'r' => Ok(EntryState::Removed), |
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456 b'm' => Ok(EntryState::Merged), |
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457 _ => Err(HgError::CorruptedRepository(format!( |
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458 "Incorrect dirstate entry state {}", |
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459 value |
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460 ))), |
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461 } |
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462 } |
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463 } |
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464 |
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465 impl Into<u8> for EntryState { |
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466 fn into(self) -> u8 { |
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467 match self { |
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468 EntryState::Normal => b'n', |
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469 EntryState::Added => b'a', |
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470 EntryState::Removed => b'r', |
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471 EntryState::Merged => b'm', |
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472 } |
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473 } |
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474 } |