annotate rust/hg-core/src/dirstate/entry.rs @ 48142:fb3b41d583c2

dirstate-item: introduce a `p2_info` property that combine two others The `merged` and `from_p2` property are always used together so we can expose a combined property instead. Differential Revision: https://phab.mercurial-scm.org/D11585
author Pierre-Yves David <pierre-yves.david@octobus.net>
date Fri, 01 Oct 2021 04:04:09 +0200
parents ab5a7fdbf75c
children 21542d4cb568
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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 p2_info(&self) -> bool {
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165 self.flags.contains(Flags::WDIR_TRACKED | Flags::P2_INFO)
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166 }
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167
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168 pub fn merged(&self) -> bool {
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169 self.flags
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170 .contains(Flags::WDIR_TRACKED | Flags::P1_TRACKED | Flags::P2_INFO)
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171 }
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172
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173 pub fn added(&self) -> bool {
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174 self.flags.contains(Flags::WDIR_TRACKED) && !self.in_either_parent()
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175 }
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176
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177 pub fn from_p2(&self) -> bool {
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178 self.flags.contains(Flags::WDIR_TRACKED | Flags::P2_INFO)
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179 && !self.flags.contains(Flags::P1_TRACKED)
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180 }
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181
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182 pub fn maybe_clean(&self) -> bool {
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183 if !self.flags.contains(Flags::WDIR_TRACKED) {
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184 false
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185 } else if !self.flags.contains(Flags::P1_TRACKED) {
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186 false
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187 } else if self.flags.contains(Flags::P2_INFO) {
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188 false
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189 } else {
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190 true
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191 }
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192 }
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193
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194 pub fn any_tracked(&self) -> bool {
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195 self.flags.intersects(
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196 Flags::WDIR_TRACKED | Flags::P1_TRACKED | Flags::P2_INFO,
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197 )
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198 }
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199
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200 /// Returns `(wdir_tracked, p1_tracked, p2_info, mode_size, mtime)`
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201 pub(crate) fn v2_data(
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202 &self,
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203 ) -> (bool, bool, bool, Option<(i32, i32)>, Option<i32>) {
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204 if !self.any_tracked() {
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205 // TODO: return an Option instead?
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206 panic!("Accessing v1_state of an untracked DirstateEntry")
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207 }
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208 let wdir_tracked = self.flags.contains(Flags::WDIR_TRACKED);
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209 let p1_tracked = self.flags.contains(Flags::P1_TRACKED);
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210 let p2_info = self.flags.contains(Flags::P2_INFO);
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211 let mode_size = self.mode_size;
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212 let mtime = self.mtime;
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213 (wdir_tracked, p1_tracked, p2_info, mode_size, mtime)
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214 }
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215
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216 fn v1_state(&self) -> EntryState {
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217 if !self.any_tracked() {
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218 // TODO: return an Option instead?
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219 panic!("Accessing v1_state of an untracked DirstateEntry")
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220 }
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221 if self.removed() {
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222 EntryState::Removed
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223 } else if self.merged() {
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224 EntryState::Merged
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225 } else if self.added() {
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226 EntryState::Added
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227 } else {
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228 EntryState::Normal
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229 }
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230 }
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231
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232 fn v1_mode(&self) -> i32 {
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233 if let Some((mode, _size)) = self.mode_size {
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234 mode
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235 } else {
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236 0
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237 }
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238 }
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239
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240 fn v1_size(&self) -> i32 {
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241 if !self.any_tracked() {
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242 // TODO: return an Option instead?
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243 panic!("Accessing v1_size of an untracked DirstateEntry")
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244 }
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245 if self.removed()
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246 && self.flags.contains(Flags::P1_TRACKED | Flags::P2_INFO)
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247 {
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248 SIZE_NON_NORMAL
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249 } else if self.removed() && self.flags.contains(Flags::P2_INFO) {
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250 SIZE_FROM_OTHER_PARENT
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251 } else if self.removed() {
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252 0
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253 } else if self.merged() {
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254 SIZE_FROM_OTHER_PARENT
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255 } else if self.added() {
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256 SIZE_NON_NORMAL
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257 } else if self.from_p2() {
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258 SIZE_FROM_OTHER_PARENT
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259 } else if let Some((_mode, size)) = self.mode_size {
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260 size
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261 } else {
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262 SIZE_NON_NORMAL
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263 }
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264 }
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265
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266 fn v1_mtime(&self) -> i32 {
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267 if !self.any_tracked() {
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268 // TODO: return an Option instead?
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269 panic!("Accessing v1_mtime of an untracked DirstateEntry")
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270 }
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271 if self.removed() {
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272 0
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273 } else if self.flags.contains(Flags::P2_INFO) {
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274 MTIME_UNSET
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275 } else if !self.flags.contains(Flags::P1_TRACKED) {
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276 MTIME_UNSET
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277 } else {
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278 self.mtime.unwrap_or(MTIME_UNSET)
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279 }
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280 }
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281
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282 // TODO: return `Option<EntryState>`? None when `!self.any_tracked`
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283 pub fn state(&self) -> EntryState {
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284 self.v1_state()
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285 }
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286
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287 // TODO: return Option?
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288 pub fn mode(&self) -> i32 {
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289 self.v1_mode()
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290 }
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291
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292 // TODO: return Option?
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293 pub fn size(&self) -> i32 {
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294 self.v1_size()
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295 }
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296
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297 // TODO: return Option?
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298 pub fn mtime(&self) -> i32 {
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299 self.v1_mtime()
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300 }
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301
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302 pub fn drop_merge_data(&mut self) {
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303 if self.flags.contains(Flags::P2_INFO) {
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304 self.flags.remove(Flags::P2_INFO);
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305 self.mode_size = None;
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306 self.mtime = None;
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307 }
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308 }
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309
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310 pub fn set_possibly_dirty(&mut self) {
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311 self.mtime = None
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312 }
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313
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314 pub fn set_clean(&mut self, mode: i32, size: i32, mtime: i32) {
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315 self.flags.insert(Flags::WDIR_TRACKED | Flags::P1_TRACKED);
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316 self.mode_size = Some((mode, size));
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317 self.mtime = Some(mtime);
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318 }
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319
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320 pub fn set_tracked(&mut self) {
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321 self.flags.insert(Flags::WDIR_TRACKED);
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322 // `set_tracked` is replacing various `normallookup` call. So we mark
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323 // the files as needing lookup
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324 //
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325 // Consider dropping this in the future in favor of something less
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326 // broad.
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327 self.mtime = None;
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328 }
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329
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330 pub fn set_untracked(&mut self) {
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331 self.flags.remove(Flags::WDIR_TRACKED);
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332 self.mode_size = None;
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333 self.mtime = None;
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334 }
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335
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336 /// Returns `(state, mode, size, mtime)` for the puprose of serialization
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337 /// in the dirstate-v1 format.
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338 ///
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339 /// This includes marker values such as `mtime == -1`. In the future we may
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340 /// want to not represent these cases that way in memory, but serialization
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341 /// will need to keep the same format.
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342 pub fn v1_data(&self) -> (u8, i32, i32, i32) {
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343 (
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344 self.v1_state().into(),
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345 self.v1_mode(),
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346 self.v1_size(),
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347 self.v1_mtime(),
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348 )
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349 }
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350
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351 pub(crate) fn is_from_other_parent(&self) -> bool {
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352 self.state() == EntryState::Normal
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353 && self.size() == SIZE_FROM_OTHER_PARENT
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354 }
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355
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356 // TODO: other platforms
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357 #[cfg(unix)]
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358 pub fn mode_changed(
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359 &self,
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360 filesystem_metadata: &std::fs::Metadata,
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361 ) -> bool {
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362 use std::os::unix::fs::MetadataExt;
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363 const EXEC_BIT_MASK: u32 = 0o100;
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364 let dirstate_exec_bit = (self.mode() as u32) & EXEC_BIT_MASK;
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365 let fs_exec_bit = filesystem_metadata.mode() & EXEC_BIT_MASK;
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366 dirstate_exec_bit != fs_exec_bit
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367 }
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368
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369 /// Returns a `(state, mode, size, mtime)` tuple as for
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370 /// `DirstateMapMethods::debug_iter`.
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371 pub fn debug_tuple(&self) -> (u8, i32, i32, i32) {
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372 (self.state().into(), self.mode(), self.size(), self.mtime())
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373 }
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374
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375 pub fn mtime_is_ambiguous(&self, now: i32) -> bool {
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376 self.state() == EntryState::Normal && self.mtime() == now
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377 }
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378
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379 pub fn clear_ambiguous_mtime(&mut self, now: i32) -> bool {
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380 let ambiguous = self.mtime_is_ambiguous(now);
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381 if ambiguous {
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382 // The file was last modified "simultaneously" with the current
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383 // write to dirstate (i.e. within the same second for file-
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384 // systems with a granularity of 1 sec). This commonly happens
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385 // for at least a couple of files on 'update'.
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386 // The user could change the file without changing its size
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387 // within the same second. Invalidate the file's mtime in
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388 // dirstate, forcing future 'status' calls to compare the
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389 // contents of the file if the size is the same. This prevents
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390 // mistakenly treating such files as clean.
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391 self.set_possibly_dirty()
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392 }
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393 ambiguous
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394 }
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395 }
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396
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397 impl EntryState {
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398 pub fn is_tracked(self) -> bool {
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399 use EntryState::*;
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400 match self {
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401 Normal | Added | Merged => true,
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402 Removed => false,
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403 }
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404 }
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405 }
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406
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407 impl TryFrom<u8> for EntryState {
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408 type Error = HgError;
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409
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410 fn try_from(value: u8) -> Result<Self, Self::Error> {
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411 match value {
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412 b'n' => Ok(EntryState::Normal),
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413 b'a' => Ok(EntryState::Added),
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414 b'r' => Ok(EntryState::Removed),
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415 b'm' => Ok(EntryState::Merged),
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416 _ => Err(HgError::CorruptedRepository(format!(
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417 "Incorrect dirstate entry state {}",
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418 value
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419 ))),
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420 }
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421 }
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422 }
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423
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424 impl Into<u8> for EntryState {
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425 fn into(self) -> u8 {
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426 match self {
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427 EntryState::Normal => b'n',
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428 EntryState::Added => b'a',
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429 EntryState::Removed => b'r',
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430 EntryState::Merged => b'm',
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431 }
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432 }
08efe5945d2b rust: Move DirstateEntry to its own module
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433 }