Mercurial > hg
annotate rust/hg-core/src/dirstate/entry.rs @ 48042:008959fcbfb2
rust: Align DirstateEntry internals with Python/C DirstateItem
This propagate to this Rust struct the similar change that was made recently
to the Python classe and C struct. Namely, instead of storing a four-valued
`state` field we now store seven (bit-packed) booleans that give lower-level
information.
Additionally, the marker values -1 and -2 for mtime and size should not
be used internally anymore. They are replaced by some combinations of booleans
For now, all uses of of `DirstateEntry` still use the compatibility APIs
with `state` and marker values. Later the Rust API for DirstateMap
will be increasingly updated to the new style.
Also change the expected result of the test_non_normal_other_parent_entries
unit test. Only a `DirstateEntry` with `size == -2 && mtime != -1` is
affected, but this case never occurs outside of unit tests.
`size == -2` was the marker value for "from other parent" entries,
where no meaningful mtime is stored.
Differential Revision: https://phab.mercurial-scm.org/D11484
author | Simon Sapin <simon.sapin@octobus.net> |
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date | Mon, 20 Sep 2021 19:18:21 +0200 |
parents | 1b2ee68e85f9 |
children | 3e69bef2031a |
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: i32, |
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20 size: i32, |
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21 mtime: i32, |
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22 } |
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23 |
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24 bitflags! { |
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25 struct Flags: u8 { |
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26 const WDIR_TRACKED = 1 << 0; |
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27 const P1_TRACKED = 1 << 1; |
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28 const P2_TRACKED = 1 << 2; |
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29 const POSSIBLY_DIRTY = 1 << 3; |
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30 const MERGED = 1 << 4; |
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31 const CLEAN_P1 = 1 << 5; |
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32 const CLEAN_P2 = 1 << 6; |
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33 const ENTRYLESS_TREE_NODE = 1 << 7; |
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34 } |
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35 } |
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36 |
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37 pub const V1_RANGEMASK: i32 = 0x7FFFFFFF; |
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38 |
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39 pub const MTIME_UNSET: i32 = -1; |
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40 |
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41 /// A `DirstateEntry` with a size of `-2` means that it was merged from the |
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42 /// other parent. This allows revert to pick the right status back during a |
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43 /// merge. |
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44 pub const SIZE_FROM_OTHER_PARENT: i32 = -2; |
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45 /// A special value used for internal representation of special case in |
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46 /// dirstate v1 format. |
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47 pub const SIZE_NON_NORMAL: i32 = -1; |
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48 |
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49 impl DirstateEntry { |
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50 pub fn from_v1_data( |
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51 state: EntryState, |
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52 mode: i32, |
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53 size: i32, |
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54 mtime: i32, |
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55 ) -> Self { |
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56 match state { |
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57 EntryState::Normal => { |
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58 if size == SIZE_FROM_OTHER_PARENT { |
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59 Self::new_from_p2() |
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60 } else if size == SIZE_NON_NORMAL { |
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61 Self::new_possibly_dirty() |
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62 } else if mtime == MTIME_UNSET { |
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63 Self { |
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64 flags: Flags::WDIR_TRACKED |
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65 | Flags::P1_TRACKED |
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66 | Flags::POSSIBLY_DIRTY, |
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67 mode, |
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68 size, |
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69 mtime: 0, |
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70 } |
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71 } else { |
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72 Self { |
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73 flags: Flags::WDIR_TRACKED | Flags::P1_TRACKED, |
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74 mode, |
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75 size, |
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76 mtime, |
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77 } |
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78 } |
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79 } |
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80 EntryState::Added => Self::new_added(), |
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81 EntryState::Removed => Self { |
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82 flags: if size == SIZE_NON_NORMAL { |
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83 Flags::P1_TRACKED // might not be true because of rename ? |
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84 | Flags::P2_TRACKED // might not be true because of rename ? |
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85 | Flags::MERGED |
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86 } else if size == SIZE_FROM_OTHER_PARENT { |
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87 // We don’t know if P1_TRACKED should be set (file history) |
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88 Flags::P2_TRACKED | Flags::CLEAN_P2 |
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89 } else { |
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90 Flags::P1_TRACKED |
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91 }, |
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92 mode: 0, |
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93 size: 0, |
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94 mtime: 0, |
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95 }, |
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96 EntryState::Merged => Self::new_merged(), |
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97 } |
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98 } |
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99 |
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100 fn new_from_p2() -> Self { |
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101 Self { |
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102 // might be missing P1_TRACKED |
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103 flags: Flags::WDIR_TRACKED | Flags::P2_TRACKED | Flags::CLEAN_P2, |
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104 mode: 0, |
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105 size: SIZE_FROM_OTHER_PARENT, |
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106 mtime: MTIME_UNSET, |
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107 } |
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108 } |
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109 |
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110 fn new_possibly_dirty() -> Self { |
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111 Self { |
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112 flags: Flags::WDIR_TRACKED |
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113 | Flags::P1_TRACKED |
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114 | Flags::POSSIBLY_DIRTY, |
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115 mode: 0, |
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116 size: SIZE_NON_NORMAL, |
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117 mtime: MTIME_UNSET, |
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118 } |
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119 } |
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120 |
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121 fn new_added() -> Self { |
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122 Self { |
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123 flags: Flags::WDIR_TRACKED, |
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124 mode: 0, |
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125 size: SIZE_NON_NORMAL, |
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126 mtime: MTIME_UNSET, |
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127 } |
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128 } |
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129 |
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130 fn new_merged() -> Self { |
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131 Self { |
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132 flags: Flags::WDIR_TRACKED |
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133 | Flags::P1_TRACKED // might not be true because of rename ? |
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134 | Flags::P2_TRACKED // might not be true because of rename ? |
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135 | Flags::MERGED, |
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136 mode: 0, |
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137 size: SIZE_NON_NORMAL, |
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138 mtime: MTIME_UNSET, |
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139 } |
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140 } |
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141 |
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142 /// Creates a new entry in "removed" state. |
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143 /// |
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144 /// `size` is expected to be zero, `SIZE_NON_NORMAL`, or |
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145 /// `SIZE_FROM_OTHER_PARENT` |
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146 pub fn new_removed(size: i32) -> Self { |
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147 Self::from_v1_data(EntryState::Removed, 0, size, 0) |
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148 } |
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149 |
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150 /// TODO: refactor `DirstateMap::add_file` to not take a `DirstateEntry` |
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151 /// parameter and remove this constructor |
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152 pub fn new_for_add_file(mode: i32, size: i32, mtime: i32) -> Self { |
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153 // XXX Arbitrary default value since the value is determined later |
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154 let state = EntryState::Normal; |
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155 Self::from_v1_data(state, mode, size, mtime) |
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156 } |
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157 |
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158 fn tracked_in_any_parent(&self) -> bool { |
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159 self.flags.intersects(Flags::P1_TRACKED | Flags::P2_TRACKED) |
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160 } |
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161 |
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162 fn removed(&self) -> bool { |
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163 self.tracked_in_any_parent() |
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164 && !self.flags.contains(Flags::WDIR_TRACKED) |
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165 } |
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166 |
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167 fn merged_removed(&self) -> bool { |
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168 self.removed() && self.flags.contains(Flags::MERGED) |
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169 } |
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170 |
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171 fn from_p2_removed(&self) -> bool { |
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172 self.removed() && self.flags.contains(Flags::CLEAN_P2) |
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173 } |
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174 |
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175 fn merged(&self) -> bool { |
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176 self.flags.contains(Flags::WDIR_TRACKED | Flags::MERGED) |
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177 } |
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178 |
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179 fn added(&self) -> bool { |
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180 self.flags.contains(Flags::WDIR_TRACKED) |
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181 && !self.tracked_in_any_parent() |
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182 } |
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183 |
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184 fn from_p2(&self) -> bool { |
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185 self.flags.contains(Flags::WDIR_TRACKED | Flags::CLEAN_P2) |
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186 } |
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187 |
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188 pub fn state(&self) -> EntryState { |
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189 if self.removed() { |
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190 EntryState::Removed |
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191 } else if self.merged() { |
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192 EntryState::Merged |
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193 } else if self.added() { |
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194 EntryState::Added |
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195 } else { |
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196 EntryState::Normal |
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197 } |
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198 } |
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199 |
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200 pub fn mode(&self) -> i32 { |
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201 self.mode |
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202 } |
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203 |
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204 pub fn size(&self) -> i32 { |
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205 if self.merged_removed() { |
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206 SIZE_NON_NORMAL |
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207 } else if self.from_p2_removed() { |
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208 SIZE_FROM_OTHER_PARENT |
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209 } else if self.removed() { |
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210 0 |
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211 } else if self.merged() { |
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212 SIZE_FROM_OTHER_PARENT |
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213 } else if self.added() { |
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214 SIZE_NON_NORMAL |
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215 } else if self.from_p2() { |
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216 SIZE_FROM_OTHER_PARENT |
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217 } else if self.flags.contains(Flags::POSSIBLY_DIRTY) { |
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218 self.size // TODO: SIZE_NON_NORMAL ? |
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219 } else { |
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220 self.size |
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221 } |
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222 } |
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223 |
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224 pub fn mtime(&self) -> i32 { |
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225 if self.removed() { |
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226 0 |
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227 } else if self.flags.contains(Flags::POSSIBLY_DIRTY) { |
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228 MTIME_UNSET |
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229 } else if self.merged() { |
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230 MTIME_UNSET |
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231 } else if self.added() { |
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232 MTIME_UNSET |
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233 } else if self.from_p2() { |
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234 MTIME_UNSET |
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235 } else { |
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236 self.mtime |
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237 } |
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238 } |
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239 |
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240 /// Returns `(state, mode, size, mtime)` for the puprose of serialization |
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241 /// in the dirstate-v1 format. |
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242 /// |
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243 /// This includes marker values such as `mtime == -1`. In the future we may |
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244 /// want to not represent these cases that way in memory, but serialization |
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245 /// will need to keep the same format. |
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246 pub fn v1_data(&self) -> (u8, i32, i32, i32) { |
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247 (self.state().into(), self.mode(), self.size(), self.mtime()) |
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248 } |
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249 |
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250 pub fn is_non_normal(&self) -> bool { |
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251 self.state() != EntryState::Normal || self.mtime() == MTIME_UNSET |
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252 } |
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253 |
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254 pub fn is_from_other_parent(&self) -> bool { |
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255 self.state() == EntryState::Normal |
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256 && self.size() == SIZE_FROM_OTHER_PARENT |
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257 } |
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258 |
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259 // TODO: other platforms |
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260 #[cfg(unix)] |
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261 pub fn mode_changed( |
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262 &self, |
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263 filesystem_metadata: &std::fs::Metadata, |
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264 ) -> bool { |
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265 use std::os::unix::fs::MetadataExt; |
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266 const EXEC_BIT_MASK: u32 = 0o100; |
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267 let dirstate_exec_bit = (self.mode() as u32) & EXEC_BIT_MASK; |
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268 let fs_exec_bit = filesystem_metadata.mode() & EXEC_BIT_MASK; |
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269 dirstate_exec_bit != fs_exec_bit |
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270 } |
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271 |
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272 /// Returns a `(state, mode, size, mtime)` tuple as for |
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273 /// `DirstateMapMethods::debug_iter`. |
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274 pub fn debug_tuple(&self) -> (u8, i32, i32, i32) { |
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275 let state = if self.flags.contains(Flags::ENTRYLESS_TREE_NODE) { |
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276 b' ' |
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277 } else { |
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278 self.state().into() |
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279 }; |
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280 (state, self.mode(), self.size(), self.mtime()) |
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281 } |
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282 |
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283 pub fn mtime_is_ambiguous(&self, now: i32) -> bool { |
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284 self.state() == EntryState::Normal && self.mtime() == now |
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285 } |
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286 |
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287 pub fn clear_ambiguous_mtime(&mut self, now: i32) -> bool { |
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288 let ambiguous = self.mtime_is_ambiguous(now); |
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289 if ambiguous { |
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290 // The file was last modified "simultaneously" with the current |
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291 // write to dirstate (i.e. within the same second for file- |
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292 // systems with a granularity of 1 sec). This commonly happens |
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293 // for at least a couple of files on 'update'. |
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294 // The user could change the file without changing its size |
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295 // within the same second. Invalidate the file's mtime in |
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296 // dirstate, forcing future 'status' calls to compare the |
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297 // contents of the file if the size is the same. This prevents |
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298 // mistakenly treating such files as clean. |
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299 self.clear_mtime() |
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300 } |
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301 ambiguous |
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302 } |
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303 |
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304 pub fn clear_mtime(&mut self) { |
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305 self.mtime = -1; |
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306 } |
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307 } |
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308 |
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309 impl EntryState { |
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310 pub fn is_tracked(self) -> bool { |
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311 use EntryState::*; |
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312 match self { |
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313 Normal | Added | Merged => true, |
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314 Removed => false, |
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315 } |
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316 } |
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317 } |
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318 |
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319 impl TryFrom<u8> for EntryState { |
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320 type Error = HgError; |
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321 |
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322 fn try_from(value: u8) -> Result<Self, Self::Error> { |
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323 match value { |
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324 b'n' => Ok(EntryState::Normal), |
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325 b'a' => Ok(EntryState::Added), |
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326 b'r' => Ok(EntryState::Removed), |
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327 b'm' => Ok(EntryState::Merged), |
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328 _ => Err(HgError::CorruptedRepository(format!( |
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329 "Incorrect dirstate entry state {}", |
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330 value |
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331 ))), |
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332 } |
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333 } |
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334 } |
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335 |
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336 impl Into<u8> for EntryState { |
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337 fn into(self) -> u8 { |
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338 match self { |
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339 EntryState::Normal => b'n', |
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340 EntryState::Added => b'a', |
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341 EntryState::Removed => b'r', |
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342 EntryState::Merged => b'm', |
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343 } |
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344 } |
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345 } |