Mercurial > hg
annotate rust/hg-core/src/dirstate/entry.rs @ 48138:38488d488ec1
dirstate-item: change the internal storage and constructor value
This should be closer to what we do need and what we can actually reliably
record.
In practice it means that we abandon the prospect of storing much more refined
data for now. We don't have the necessary information nor code using it right
now. So it seems safer to just use a clearer version of what we had so far.
See the documentation changes for details.
Differential Revision: https://phab.mercurial-scm.org/D11557
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Fri, 01 Oct 2021 20:35:30 +0200 |
parents | 3c7db97ce541 |
children | ab5a7fdbf75c |
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 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 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 new( |
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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 fn v1_state(&self) -> EntryState { |
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197 if !self.any_tracked() { |
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198 // TODO: return an Option instead? |
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199 panic!("Accessing v1_state of an untracked DirstateEntry") |
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200 } |
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201 if self.removed() { |
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202 EntryState::Removed |
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203 } else if self.merged() { |
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204 EntryState::Merged |
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205 } else if self.added() { |
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206 EntryState::Added |
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207 } else { |
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208 EntryState::Normal |
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209 } |
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210 } |
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211 |
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212 fn v1_mode(&self) -> i32 { |
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213 if let Some((mode, _size)) = self.mode_size { |
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214 mode |
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215 } else { |
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216 0 |
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217 } |
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218 } |
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219 |
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220 fn v1_size(&self) -> i32 { |
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221 if !self.any_tracked() { |
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222 // TODO: return an Option instead? |
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223 panic!("Accessing v1_size of an untracked DirstateEntry") |
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224 } |
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225 if self.removed() |
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226 && self.flags.contains(Flags::P1_TRACKED | Flags::P2_INFO) |
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227 { |
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228 SIZE_NON_NORMAL |
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229 } else if self.removed() && self.flags.contains(Flags::P2_INFO) { |
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230 SIZE_FROM_OTHER_PARENT |
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231 } else if self.removed() { |
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232 0 |
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233 } else if self.merged() { |
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234 SIZE_FROM_OTHER_PARENT |
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235 } else if self.added() { |
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236 SIZE_NON_NORMAL |
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237 } else if self.from_p2() { |
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238 SIZE_FROM_OTHER_PARENT |
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239 } else if let Some((_mode, size)) = self.mode_size { |
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240 size |
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241 } else { |
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242 SIZE_NON_NORMAL |
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243 } |
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244 } |
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245 |
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246 fn v1_mtime(&self) -> i32 { |
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247 if !self.any_tracked() { |
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248 // TODO: return an Option instead? |
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249 panic!("Accessing v1_mtime of an untracked DirstateEntry") |
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250 } |
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251 if self.removed() { |
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252 0 |
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253 } else if self.flags.contains(Flags::P2_INFO) { |
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254 MTIME_UNSET |
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255 } else if !self.flags.contains(Flags::P1_TRACKED) { |
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256 MTIME_UNSET |
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257 } else { |
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258 self.mtime.unwrap_or(MTIME_UNSET) |
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259 } |
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260 } |
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261 |
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262 // TODO: return `Option<EntryState>`? None when `!self.any_tracked` |
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263 pub fn state(&self) -> EntryState { |
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264 self.v1_state() |
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265 } |
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266 |
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267 // TODO: return Option? |
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268 pub fn mode(&self) -> i32 { |
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269 self.v1_mode() |
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270 } |
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271 |
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272 // TODO: return Option? |
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273 pub fn size(&self) -> i32 { |
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274 self.v1_size() |
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275 } |
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276 |
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277 // TODO: return Option? |
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278 pub fn mtime(&self) -> i32 { |
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279 self.v1_mtime() |
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280 } |
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281 |
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282 pub fn drop_merge_data(&mut self) { |
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283 if self.flags.contains(Flags::P2_INFO) { |
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284 self.flags.remove(Flags::P2_INFO); |
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285 self.mode_size = None; |
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286 self.mtime = None; |
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287 } |
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288 } |
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289 |
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290 pub fn set_possibly_dirty(&mut self) { |
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291 self.mtime = None |
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292 } |
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293 |
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294 pub fn set_clean(&mut self, mode: i32, size: i32, mtime: i32) { |
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295 self.flags.insert(Flags::WDIR_TRACKED | Flags::P1_TRACKED); |
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296 self.mode_size = Some((mode, size)); |
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297 self.mtime = Some(mtime); |
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298 } |
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299 |
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300 pub fn set_tracked(&mut self) { |
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301 self.flags.insert(Flags::WDIR_TRACKED); |
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302 // `set_tracked` is replacing various `normallookup` call. So we mark |
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303 // the files as needing lookup |
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304 // |
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305 // Consider dropping this in the future in favor of something less |
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306 // broad. |
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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_untracked(&mut self) { |
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311 self.flags.remove(Flags::WDIR_TRACKED); |
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312 self.mode_size = None; |
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313 self.mtime = None; |
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314 } |
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315 |
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316 /// Returns `(state, mode, size, mtime)` for the puprose of serialization |
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317 /// in the dirstate-v1 format. |
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318 /// |
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319 /// This includes marker values such as `mtime == -1`. In the future we may |
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320 /// want to not represent these cases that way in memory, but serialization |
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321 /// will need to keep the same format. |
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322 pub fn v1_data(&self) -> (u8, i32, i32, i32) { |
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323 ( |
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324 self.v1_state().into(), |
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325 self.v1_mode(), |
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326 self.v1_size(), |
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327 self.v1_mtime(), |
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328 ) |
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329 } |
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330 |
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331 pub(crate) fn is_from_other_parent(&self) -> bool { |
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332 self.state() == EntryState::Normal |
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333 && self.size() == SIZE_FROM_OTHER_PARENT |
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334 } |
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335 |
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336 // TODO: other platforms |
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337 #[cfg(unix)] |
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338 pub fn mode_changed( |
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339 &self, |
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340 filesystem_metadata: &std::fs::Metadata, |
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341 ) -> bool { |
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342 use std::os::unix::fs::MetadataExt; |
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343 const EXEC_BIT_MASK: u32 = 0o100; |
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344 let dirstate_exec_bit = (self.mode() as u32) & EXEC_BIT_MASK; |
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345 let fs_exec_bit = filesystem_metadata.mode() & EXEC_BIT_MASK; |
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346 dirstate_exec_bit != fs_exec_bit |
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347 } |
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348 |
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349 /// Returns a `(state, mode, size, mtime)` tuple as for |
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350 /// `DirstateMapMethods::debug_iter`. |
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351 pub fn debug_tuple(&self) -> (u8, i32, i32, i32) { |
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352 (self.state().into(), self.mode(), self.size(), self.mtime()) |
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353 } |
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354 |
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355 pub fn mtime_is_ambiguous(&self, now: i32) -> bool { |
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356 self.state() == EntryState::Normal && self.mtime() == now |
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357 } |
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358 |
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359 pub fn clear_ambiguous_mtime(&mut self, now: i32) -> bool { |
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360 let ambiguous = self.mtime_is_ambiguous(now); |
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361 if ambiguous { |
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362 // The file was last modified "simultaneously" with the current |
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363 // write to dirstate (i.e. within the same second for file- |
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364 // systems with a granularity of 1 sec). This commonly happens |
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365 // for at least a couple of files on 'update'. |
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366 // The user could change the file without changing its size |
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367 // within the same second. Invalidate the file's mtime in |
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368 // dirstate, forcing future 'status' calls to compare the |
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369 // contents of the file if the size is the same. This prevents |
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370 // mistakenly treating such files as clean. |
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371 self.set_possibly_dirty() |
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372 } |
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373 ambiguous |
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374 } |
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375 } |
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376 |
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377 impl EntryState { |
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378 pub fn is_tracked(self) -> bool { |
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379 use EntryState::*; |
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380 match self { |
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381 Normal | Added | Merged => true, |
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382 Removed => false, |
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383 } |
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384 } |
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385 } |
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386 |
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387 impl TryFrom<u8> for EntryState { |
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388 type Error = HgError; |
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389 |
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390 fn try_from(value: u8) -> Result<Self, Self::Error> { |
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391 match value { |
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392 b'n' => Ok(EntryState::Normal), |
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393 b'a' => Ok(EntryState::Added), |
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394 b'r' => Ok(EntryState::Removed), |
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395 b'm' => Ok(EntryState::Merged), |
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396 _ => Err(HgError::CorruptedRepository(format!( |
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397 "Incorrect dirstate entry state {}", |
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398 value |
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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 |
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404 impl Into<u8> for EntryState { |
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405 fn into(self) -> u8 { |
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406 match self { |
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407 EntryState::Normal => b'n', |
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408 EntryState::Added => b'a', |
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409 EntryState::Removed => b'r', |
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410 EntryState::Merged => b'm', |
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411 } |
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412 } |
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413 } |