Mercurial > hg
annotate rust/hg-core/src/dirstate/entry.rs @ 48139:ab5a7fdbf75c
dirstate-v2: Store a bitfield on disk instead of v1-like state
Differential Revision: https://phab.mercurial-scm.org/D11558
author | Simon Sapin <simon.sapin@octobus.net> |
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date | Fri, 01 Oct 2021 18:49:33 +0200 |
parents | 38488d488ec1 |
children | fb3b41d583c2 |
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 |
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5 #[derive(Copy, Clone, Debug, Eq, PartialEq)] |
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6 pub enum EntryState { |
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7 Normal, |
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8 Added, |
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9 Removed, |
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10 Merged, |
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11 } |
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12 |
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13 /// The C implementation uses all signed types. This will be an issue |
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14 /// either when 4GB+ source files are commonplace or in 2038, whichever |
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15 /// comes first. |
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16 #[derive(Debug, PartialEq, Copy, Clone)] |
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17 pub struct DirstateEntry { |
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18 pub(crate) flags: Flags, |
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19 mode_size: Option<(i32, i32)>, |
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20 mtime: Option<i32>, |
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21 } |
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22 |
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23 bitflags! { |
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24 pub(crate) struct Flags: u8 { |
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25 const WDIR_TRACKED = 1 << 0; |
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26 const P1_TRACKED = 1 << 1; |
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27 const P2_INFO = 1 << 2; |
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28 } |
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29 } |
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30 |
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31 pub const V1_RANGEMASK: i32 = 0x7FFFFFFF; |
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32 |
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33 pub const MTIME_UNSET: i32 = -1; |
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34 |
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35 /// A `DirstateEntry` with a size of `-2` means that it was merged from the |
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36 /// other parent. This allows revert to pick the right status back during a |
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37 /// merge. |
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38 pub const SIZE_FROM_OTHER_PARENT: i32 = -2; |
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39 /// A special value used for internal representation of special case in |
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40 /// dirstate v1 format. |
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41 pub const SIZE_NON_NORMAL: i32 = -1; |
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42 |
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43 impl DirstateEntry { |
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44 pub fn from_v2_data( |
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45 wdir_tracked: bool, |
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46 p1_tracked: bool, |
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47 p2_info: bool, |
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48 mode_size: Option<(i32, i32)>, |
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49 mtime: Option<i32>, |
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50 ) -> Self { |
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51 let mut flags = Flags::empty(); |
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52 flags.set(Flags::WDIR_TRACKED, wdir_tracked); |
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53 flags.set(Flags::P1_TRACKED, p1_tracked); |
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54 flags.set(Flags::P2_INFO, p2_info); |
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55 Self { |
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56 flags, |
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57 mode_size, |
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58 mtime, |
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59 } |
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60 } |
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61 |
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62 pub fn from_v1_data( |
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63 state: EntryState, |
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64 mode: i32, |
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65 size: i32, |
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66 mtime: i32, |
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67 ) -> Self { |
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68 match state { |
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69 EntryState::Normal => { |
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70 if size == SIZE_FROM_OTHER_PARENT { |
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71 Self::new_from_p2() |
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72 } else if size == SIZE_NON_NORMAL { |
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73 Self::new_possibly_dirty() |
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74 } else if mtime == MTIME_UNSET { |
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75 Self { |
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76 flags: Flags::WDIR_TRACKED | Flags::P1_TRACKED, |
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77 mode_size: Some((mode, size)), |
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78 mtime: None, |
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79 } |
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80 } else { |
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81 Self::new_normal(mode, size, mtime) |
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82 } |
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83 } |
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84 EntryState::Added => Self::new_added(), |
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85 EntryState::Removed => Self { |
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86 flags: if size == SIZE_NON_NORMAL { |
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87 Flags::P1_TRACKED | Flags::P2_INFO |
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88 } else if size == SIZE_FROM_OTHER_PARENT { |
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89 // We don’t know if P1_TRACKED should be set (file history) |
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90 Flags::P2_INFO |
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91 } else { |
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92 Flags::P1_TRACKED |
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93 }, |
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94 mode_size: None, |
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95 mtime: None, |
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96 }, |
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97 EntryState::Merged => Self::new_merged(), |
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98 } |
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99 } |
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100 |
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101 pub fn new_from_p2() -> Self { |
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102 Self { |
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103 // might be missing P1_TRACKED |
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104 flags: Flags::WDIR_TRACKED | Flags::P2_INFO, |
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105 mode_size: None, |
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106 mtime: None, |
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107 } |
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108 } |
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109 |
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110 pub fn new_possibly_dirty() -> Self { |
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111 Self { |
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112 flags: Flags::WDIR_TRACKED | Flags::P1_TRACKED, |
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113 mode_size: None, |
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114 mtime: None, |
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115 } |
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116 } |
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117 |
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118 pub fn new_added() -> Self { |
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119 Self { |
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120 flags: Flags::WDIR_TRACKED, |
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121 mode_size: None, |
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122 mtime: None, |
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123 } |
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124 } |
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125 |
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126 pub fn new_merged() -> Self { |
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127 Self { |
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128 flags: Flags::WDIR_TRACKED |
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129 | Flags::P1_TRACKED // might not be true because of rename ? |
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130 | Flags::P2_INFO, // might not be true because of rename ? |
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131 mode_size: None, |
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132 mtime: None, |
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133 } |
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134 } |
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135 |
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136 pub fn new_normal(mode: i32, size: i32, mtime: i32) -> Self { |
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137 Self { |
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138 flags: Flags::WDIR_TRACKED | Flags::P1_TRACKED, |
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139 mode_size: Some((mode, size)), |
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140 mtime: Some(mtime), |
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141 } |
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142 } |
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143 |
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144 /// Creates a new entry in "removed" state. |
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145 /// |
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146 /// `size` is expected to be zero, `SIZE_NON_NORMAL`, or |
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147 /// `SIZE_FROM_OTHER_PARENT` |
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148 pub fn new_removed(size: i32) -> Self { |
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149 Self::from_v1_data(EntryState::Removed, 0, size, 0) |
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150 } |
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151 |
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152 pub fn tracked(&self) -> bool { |
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153 self.flags.contains(Flags::WDIR_TRACKED) |
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154 } |
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155 |
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156 fn in_either_parent(&self) -> bool { |
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157 self.flags.intersects(Flags::P1_TRACKED | Flags::P2_INFO) |
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158 } |
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159 |
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160 pub fn removed(&self) -> bool { |
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161 self.in_either_parent() && !self.flags.contains(Flags::WDIR_TRACKED) |
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162 } |
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163 |
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164 pub fn merged(&self) -> bool { |
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165 self.flags |
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166 .contains(Flags::WDIR_TRACKED | Flags::P1_TRACKED | Flags::P2_INFO) |
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167 } |
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168 |
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169 pub fn added(&self) -> bool { |
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170 self.flags.contains(Flags::WDIR_TRACKED) && !self.in_either_parent() |
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171 } |
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172 |
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173 pub fn from_p2(&self) -> bool { |
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174 self.flags.contains(Flags::WDIR_TRACKED | Flags::P2_INFO) |
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175 && !self.flags.contains(Flags::P1_TRACKED) |
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176 } |
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177 |
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178 pub fn maybe_clean(&self) -> bool { |
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179 if !self.flags.contains(Flags::WDIR_TRACKED) { |
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180 false |
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181 } else if !self.flags.contains(Flags::P1_TRACKED) { |
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182 false |
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183 } else if self.flags.contains(Flags::P2_INFO) { |
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184 false |
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185 } else { |
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186 true |
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187 } |
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188 } |
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189 |
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190 pub fn any_tracked(&self) -> bool { |
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191 self.flags.intersects( |
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192 Flags::WDIR_TRACKED | Flags::P1_TRACKED | Flags::P2_INFO, |
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193 ) |
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194 } |
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195 |
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196 /// Returns `(wdir_tracked, p1_tracked, p2_info, mode_size, mtime)` |
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197 pub(crate) fn v2_data( |
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198 &self, |
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199 ) -> (bool, bool, bool, Option<(i32, i32)>, Option<i32>) { |
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200 if !self.any_tracked() { |
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201 // TODO: return an Option instead? |
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202 panic!("Accessing v1_state of an untracked DirstateEntry") |
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203 } |
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204 let wdir_tracked = self.flags.contains(Flags::WDIR_TRACKED); |
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205 let p1_tracked = self.flags.contains(Flags::P1_TRACKED); |
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206 let p2_info = self.flags.contains(Flags::P2_INFO); |
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207 let mode_size = self.mode_size; |
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208 let mtime = self.mtime; |
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209 (wdir_tracked, p1_tracked, p2_info, mode_size, mtime) |
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210 } |
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211 |
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212 fn v1_state(&self) -> EntryState { |
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213 if !self.any_tracked() { |
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214 // TODO: return an Option instead? |
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215 panic!("Accessing v1_state of an untracked DirstateEntry") |
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216 } |
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217 if self.removed() { |
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218 EntryState::Removed |
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219 } else if self.merged() { |
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220 EntryState::Merged |
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221 } else if self.added() { |
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222 EntryState::Added |
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223 } else { |
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224 EntryState::Normal |
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225 } |
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226 } |
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227 |
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228 fn v1_mode(&self) -> i32 { |
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229 if let Some((mode, _size)) = self.mode_size { |
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230 mode |
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231 } else { |
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232 0 |
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233 } |
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234 } |
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235 |
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236 fn v1_size(&self) -> i32 { |
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237 if !self.any_tracked() { |
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238 // TODO: return an Option instead? |
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239 panic!("Accessing v1_size of an untracked DirstateEntry") |
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240 } |
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241 if self.removed() |
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242 && self.flags.contains(Flags::P1_TRACKED | Flags::P2_INFO) |
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243 { |
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244 SIZE_NON_NORMAL |
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245 } else if self.removed() && self.flags.contains(Flags::P2_INFO) { |
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246 SIZE_FROM_OTHER_PARENT |
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247 } else if self.removed() { |
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248 0 |
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249 } else if self.merged() { |
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250 SIZE_FROM_OTHER_PARENT |
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251 } else if self.added() { |
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252 SIZE_NON_NORMAL |
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253 } else if self.from_p2() { |
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254 SIZE_FROM_OTHER_PARENT |
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255 } else if let Some((_mode, size)) = self.mode_size { |
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256 size |
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257 } else { |
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258 SIZE_NON_NORMAL |
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259 } |
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260 } |
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261 |
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262 fn v1_mtime(&self) -> i32 { |
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263 if !self.any_tracked() { |
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264 // TODO: return an Option instead? |
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265 panic!("Accessing v1_mtime of an untracked DirstateEntry") |
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266 } |
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267 if self.removed() { |
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268 0 |
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269 } else if self.flags.contains(Flags::P2_INFO) { |
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270 MTIME_UNSET |
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271 } else if !self.flags.contains(Flags::P1_TRACKED) { |
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272 MTIME_UNSET |
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273 } else { |
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274 self.mtime.unwrap_or(MTIME_UNSET) |
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275 } |
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276 } |
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277 |
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278 // TODO: return `Option<EntryState>`? None when `!self.any_tracked` |
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279 pub fn state(&self) -> EntryState { |
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280 self.v1_state() |
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281 } |
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282 |
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283 // TODO: return Option? |
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284 pub fn mode(&self) -> i32 { |
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285 self.v1_mode() |
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286 } |
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287 |
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288 // TODO: return Option? |
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289 pub fn size(&self) -> i32 { |
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290 self.v1_size() |
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291 } |
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292 |
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293 // TODO: return Option? |
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294 pub fn mtime(&self) -> i32 { |
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295 self.v1_mtime() |
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296 } |
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297 |
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298 pub fn drop_merge_data(&mut self) { |
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299 if self.flags.contains(Flags::P2_INFO) { |
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300 self.flags.remove(Flags::P2_INFO); |
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301 self.mode_size = None; |
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302 self.mtime = None; |
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303 } |
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304 } |
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305 |
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306 pub fn set_possibly_dirty(&mut self) { |
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307 self.mtime = None |
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308 } |
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309 |
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310 pub fn set_clean(&mut self, mode: i32, size: i32, mtime: i32) { |
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311 self.flags.insert(Flags::WDIR_TRACKED | Flags::P1_TRACKED); |
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312 self.mode_size = Some((mode, size)); |
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313 self.mtime = Some(mtime); |
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314 } |
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315 |
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316 pub fn set_tracked(&mut self) { |
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317 self.flags.insert(Flags::WDIR_TRACKED); |
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318 // `set_tracked` is replacing various `normallookup` call. So we mark |
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319 // the files as needing lookup |
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320 // |
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321 // Consider dropping this in the future in favor of something less |
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322 // broad. |
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323 self.mtime = None; |
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324 } |
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325 |
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326 pub fn set_untracked(&mut self) { |
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327 self.flags.remove(Flags::WDIR_TRACKED); |
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328 self.mode_size = None; |
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329 self.mtime = None; |
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330 } |
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331 |
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332 /// Returns `(state, mode, size, mtime)` for the puprose of serialization |
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333 /// in the dirstate-v1 format. |
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334 /// |
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335 /// This includes marker values such as `mtime == -1`. In the future we may |
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336 /// want to not represent these cases that way in memory, but serialization |
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337 /// will need to keep the same format. |
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338 pub fn v1_data(&self) -> (u8, i32, i32, i32) { |
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339 ( |
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340 self.v1_state().into(), |
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341 self.v1_mode(), |
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342 self.v1_size(), |
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343 self.v1_mtime(), |
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344 ) |
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345 } |
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346 |
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347 pub(crate) fn is_from_other_parent(&self) -> bool { |
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348 self.state() == EntryState::Normal |
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349 && self.size() == SIZE_FROM_OTHER_PARENT |
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350 } |
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351 |
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352 // TODO: other platforms |
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353 #[cfg(unix)] |
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354 pub fn mode_changed( |
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355 &self, |
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356 filesystem_metadata: &std::fs::Metadata, |
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357 ) -> bool { |
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358 use std::os::unix::fs::MetadataExt; |
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359 const EXEC_BIT_MASK: u32 = 0o100; |
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360 let dirstate_exec_bit = (self.mode() as u32) & EXEC_BIT_MASK; |
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361 let fs_exec_bit = filesystem_metadata.mode() & EXEC_BIT_MASK; |
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362 dirstate_exec_bit != fs_exec_bit |
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363 } |
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364 |
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365 /// Returns a `(state, mode, size, mtime)` tuple as for |
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366 /// `DirstateMapMethods::debug_iter`. |
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367 pub fn debug_tuple(&self) -> (u8, i32, i32, i32) { |
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368 (self.state().into(), self.mode(), self.size(), self.mtime()) |
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369 } |
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370 |
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371 pub fn mtime_is_ambiguous(&self, now: i32) -> bool { |
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372 self.state() == EntryState::Normal && self.mtime() == now |
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373 } |
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374 |
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375 pub fn clear_ambiguous_mtime(&mut self, now: i32) -> bool { |
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376 let ambiguous = self.mtime_is_ambiguous(now); |
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377 if ambiguous { |
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378 // The file was last modified "simultaneously" with the current |
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379 // write to dirstate (i.e. within the same second for file- |
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380 // systems with a granularity of 1 sec). This commonly happens |
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381 // for at least a couple of files on 'update'. |
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382 // The user could change the file without changing its size |
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383 // within the same second. Invalidate the file's mtime in |
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384 // dirstate, forcing future 'status' calls to compare the |
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385 // contents of the file if the size is the same. This prevents |
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386 // mistakenly treating such files as clean. |
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387 self.set_possibly_dirty() |
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388 } |
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389 ambiguous |
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390 } |
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391 } |
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392 |
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393 impl EntryState { |
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394 pub fn is_tracked(self) -> bool { |
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395 use EntryState::*; |
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396 match self { |
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397 Normal | Added | Merged => true, |
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398 Removed => false, |
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399 } |
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400 } |
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401 } |
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402 |
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403 impl TryFrom<u8> for EntryState { |
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404 type Error = HgError; |
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405 |
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406 fn try_from(value: u8) -> Result<Self, Self::Error> { |
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407 match value { |
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408 b'n' => Ok(EntryState::Normal), |
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409 b'a' => Ok(EntryState::Added), |
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410 b'r' => Ok(EntryState::Removed), |
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411 b'm' => Ok(EntryState::Merged), |
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412 _ => Err(HgError::CorruptedRepository(format!( |
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413 "Incorrect dirstate entry state {}", |
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414 value |
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415 ))), |
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416 } |
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417 } |
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418 } |
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419 |
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420 impl Into<u8> for EntryState { |
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421 fn into(self) -> u8 { |
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422 match self { |
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Simon Sapin <simon.sapin@octobus.net>
parents:
diff
changeset
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423 EntryState::Normal => b'n', |
08efe5945d2b
rust: Move DirstateEntry to its own module
Simon Sapin <simon.sapin@octobus.net>
parents:
diff
changeset
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424 EntryState::Added => b'a', |
08efe5945d2b
rust: Move DirstateEntry to its own module
Simon Sapin <simon.sapin@octobus.net>
parents:
diff
changeset
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425 EntryState::Removed => b'r', |
08efe5945d2b
rust: Move DirstateEntry to its own module
Simon Sapin <simon.sapin@octobus.net>
parents:
diff
changeset
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426 EntryState::Merged => b'm', |
08efe5945d2b
rust: Move DirstateEntry to its own module
Simon Sapin <simon.sapin@octobus.net>
parents:
diff
changeset
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427 } |
08efe5945d2b
rust: Move DirstateEntry to its own module
Simon Sapin <simon.sapin@octobus.net>
parents:
diff
changeset
|
428 } |
08efe5945d2b
rust: Move DirstateEntry to its own module
Simon Sapin <simon.sapin@octobus.net>
parents:
diff
changeset
|
429 } |