author | Simon Sapin <simon.sapin@octobus.net> |
Fri, 17 Sep 2021 13:33:45 +0200 | |
changeset 48022 | f2a9db29cb2d |
parent 48018 | 08efe5945d2b |
child 48026 | 1b2ee68e85f9 |
permissions | -rw-r--r-- |
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1 |
use crate::errors::HgError; |
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use std::convert::TryFrom; |
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#[derive(Copy, Clone, Debug, Eq, PartialEq)] |
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pub enum EntryState { |
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6 |
Normal, |
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7 |
Added, |
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8 |
Removed, |
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9 |
Merged, |
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10 |
Unknown, |
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11 |
} |
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/// The C implementation uses all signed types. This will be an issue |
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/// either when 4GB+ source files are commonplace or in 2038, whichever |
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/// comes first. |
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#[derive(Debug, PartialEq, Copy, Clone)] |
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pub struct DirstateEntry { |
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state: EntryState, |
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mode: i32, |
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size: i32, |
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mtime: i32, |
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} |
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pub const V1_RANGEMASK: i32 = 0x7FFFFFFF; |
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pub const MTIME_UNSET: i32 = -1; |
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/// A `DirstateEntry` with a size of `-2` means that it was merged from the |
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/// other parent. This allows revert to pick the right status back during a |
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/// merge. |
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pub const SIZE_FROM_OTHER_PARENT: i32 = -2; |
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/// A special value used for internal representation of special case in |
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/// dirstate v1 format. |
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pub const SIZE_NON_NORMAL: i32 = -1; |
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impl DirstateEntry { |
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pub fn from_v1_data( |
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state: EntryState, |
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mode: i32, |
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size: i32, |
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mtime: i32, |
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) -> Self { |
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Self { |
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state, |
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mode, |
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size, |
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mtime, |
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} |
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} |
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/// Creates a new entry in "removed" state. |
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/// |
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/// `size` is expected to be zero, `SIZE_NON_NORMAL`, or |
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/// `SIZE_FROM_OTHER_PARENT` |
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pub fn new_removed(size: i32) -> Self { |
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Self { |
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state: EntryState::Removed, |
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mode: 0, |
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size, |
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mtime: 0, |
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} |
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} |
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/// TODO: refactor `DirstateMap::add_file` to not take a `DirstateEntry` |
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/// parameter and remove this constructor |
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pub fn new_for_add_file(mode: i32, size: i32, mtime: i32) -> Self { |
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Self { |
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// XXX Arbitrary default value since the value is determined later |
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state: EntryState::Normal, |
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mode, |
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size, |
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mtime, |
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} |
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} |
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pub fn state(&self) -> EntryState { |
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self.state |
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} |
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pub fn mode(&self) -> i32 { |
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self.mode |
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} |
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pub fn size(&self) -> i32 { |
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self.size |
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} |
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pub fn mtime(&self) -> i32 { |
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self.mtime |
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} |
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/// Returns `(state, mode, size, mtime)` for the puprose of serialization |
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/// in the dirstate-v1 format. |
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/// |
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/// This includes marker values such as `mtime == -1`. In the future we may |
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/// want to not represent these cases that way in memory, but serialization |
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/// will need to keep the same format. |
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pub fn v1_data(&self) -> (u8, i32, i32, i32) { |
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(self.state.into(), self.mode, self.size, self.mtime) |
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} |
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pub fn is_non_normal(&self) -> bool { |
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self.state != EntryState::Normal || self.mtime == MTIME_UNSET |
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104 |
} |
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pub fn is_from_other_parent(&self) -> bool { |
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self.state == EntryState::Normal && self.size == SIZE_FROM_OTHER_PARENT |
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108 |
} |
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// TODO: other platforms |
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111 |
#[cfg(unix)] |
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112 |
pub fn mode_changed( |
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113 |
&self, |
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114 |
filesystem_metadata: &std::fs::Metadata, |
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115 |
) -> bool { |
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use std::os::unix::fs::MetadataExt; |
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const EXEC_BIT_MASK: u32 = 0o100; |
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let dirstate_exec_bit = (self.mode as u32) & EXEC_BIT_MASK; |
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let fs_exec_bit = filesystem_metadata.mode() & EXEC_BIT_MASK; |
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dirstate_exec_bit != fs_exec_bit |
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121 |
} |
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122 |
|
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/// Returns a `(state, mode, size, mtime)` tuple as for |
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/// `DirstateMapMethods::debug_iter`. |
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pub fn debug_tuple(&self) -> (u8, i32, i32, i32) { |
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(self.state.into(), self.mode, self.size, self.mtime) |
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127 |
} |
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128 |
|
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129 |
pub fn mtime_is_ambiguous(&self, now: i32) -> bool { |
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self.state == EntryState::Normal && self.mtime == now |
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131 |
} |
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132 |
|
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pub fn clear_ambiguous_mtime(&mut self, now: i32) -> bool { |
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let ambiguous = self.mtime_is_ambiguous(now); |
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if ambiguous { |
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136 |
// The file was last modified "simultaneously" with the current |
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// write to dirstate (i.e. within the same second for file- |
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// systems with a granularity of 1 sec). This commonly happens |
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// for at least a couple of files on 'update'. |
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140 |
// The user could change the file without changing its size |
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141 |
// within the same second. Invalidate the file's mtime in |
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142 |
// dirstate, forcing future 'status' calls to compare the |
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143 |
// contents of the file if the size is the same. This prevents |
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144 |
// mistakenly treating such files as clean. |
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145 |
self.clear_mtime() |
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146 |
} |
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147 |
ambiguous |
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148 |
} |
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149 |
|
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150 |
pub fn clear_mtime(&mut self) { |
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151 |
self.mtime = -1; |
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152 |
} |
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153 |
} |
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154 |
|
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155 |
impl EntryState { |
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156 |
pub fn is_tracked(self) -> bool { |
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157 |
use EntryState::*; |
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158 |
match self { |
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159 |
Normal | Added | Merged => true, |
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160 |
Removed | Unknown => false, |
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161 |
} |
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162 |
} |
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163 |
} |
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164 |
|
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165 |
impl TryFrom<u8> for EntryState { |
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166 |
type Error = HgError; |
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167 |
|
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168 |
fn try_from(value: u8) -> Result<Self, Self::Error> { |
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169 |
match value { |
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170 |
b'n' => Ok(EntryState::Normal), |
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171 |
b'a' => Ok(EntryState::Added), |
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172 |
b'r' => Ok(EntryState::Removed), |
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173 |
b'm' => Ok(EntryState::Merged), |
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174 |
b'?' => Ok(EntryState::Unknown), |
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175 |
_ => Err(HgError::CorruptedRepository(format!( |
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176 |
"Incorrect dirstate entry state {}", |
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177 |
value |
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178 |
))), |
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179 |
} |
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180 |
} |
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181 |
} |
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182 |
|
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183 |
impl Into<u8> for EntryState { |
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184 |
fn into(self) -> u8 { |
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185 |
match self { |
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186 |
EntryState::Normal => b'n', |
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187 |
EntryState::Added => b'a', |
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188 |
EntryState::Removed => b'r', |
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189 |
EntryState::Merged => b'm', |
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190 |
EntryState::Unknown => b'?', |
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191 |
} |
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192 |
} |
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193 |
} |