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annotate rust/hg-core/src/dirstate_tree/status.rs @ 47339:0252600fd1cf

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dirstate-tree: Downgrade `&mut Node` to `&Node` in status and serialization Mutable access is not used, and upcoming changes will make it more costly (with copy-on-write nodes that can be read from disk representation) Differential Revision: https://phab.mercurial-scm.org/D10745
author Simon Sapin <simon.sapin@octobus.net>
date Wed, 19 May 2021 13:15:00 +0200
parents ce41ee53263f
children 69530e5d4fe5
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 use crate::dirstate::status::IgnoreFnType;
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2 use crate::dirstate_tree::dirstate_map::ChildNodes;
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3 use crate::dirstate_tree::dirstate_map::DirstateMap;
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4 use crate::dirstate_tree::dirstate_map::Node;
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5 use crate::matchers::get_ignore_function;
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6 use crate::matchers::Matcher;
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7 use crate::utils::files::get_bytes_from_os_string;
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8 use crate::utils::hg_path::HgPath;
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9 use crate::BadMatch;
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10 use crate::DirstateStatus;
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11 use crate::EntryState;
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12 use crate::HgPathBuf;
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13 use crate::PatternFileWarning;
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14 use crate::StatusError;
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15 use crate::StatusOptions;
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16 use micro_timer::timed;
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17 use rayon::prelude::*;
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18 use std::borrow::Cow;
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19 use std::io;
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20 use std::path::Path;
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21 use std::path::PathBuf;
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22 use std::sync::Mutex;
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23
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24 /// Returns the status of the working directory compared to its parent
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25 /// changeset.
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26 ///
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27 /// This algorithm is based on traversing the filesystem tree (`fs` in function
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28 /// and variable names) and dirstate tree at the same time. The core of this
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29 /// traversal is the recursive `traverse_fs_directory_and_dirstate` function
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30 /// and its use of `itertools::merge_join_by`. When reaching a path that only
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31 /// exists in one of the two trees, depending on information requested by
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32 /// `options` we may need to traverse the remaining subtree.
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33 #[timed]
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34 pub fn status<'tree>(
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35 dmap: &'tree mut DirstateMap,
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36 matcher: &(dyn Matcher + Sync),
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37 root_dir: PathBuf,
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38 ignore_files: Vec<PathBuf>,
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39 options: StatusOptions,
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40 ) -> Result<(DirstateStatus<'tree>, Vec<PatternFileWarning>), StatusError> {
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41 let (ignore_fn, warnings): (IgnoreFnType, _) =
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42 if options.list_ignored || options.list_unknown {
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43 get_ignore_function(ignore_files, &root_dir)?
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44 } else {
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45 (Box::new(|&_| true), vec![])
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46 };
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47
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48 let common = StatusCommon {
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49 options,
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50 matcher,
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51 ignore_fn,
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52 outcome: Mutex::new(DirstateStatus::default()),
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53 };
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54 let is_at_repo_root = true;
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55 let hg_path = HgPath::new("");
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56 let has_ignored_ancestor = false;
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57 common.traverse_fs_directory_and_dirstate(
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58 has_ignored_ancestor,
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59 &dmap.root,
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60 hg_path,
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61 &root_dir,
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62 is_at_repo_root,
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63 );
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64 Ok((common.outcome.into_inner().unwrap(), warnings))
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65 }
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66
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67 /// Bag of random things needed by various parts of the algorithm. Reduces the
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68 /// number of parameters passed to functions.
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69 struct StatusCommon<'tree, 'a> {
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70 options: StatusOptions,
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71 matcher: &'a (dyn Matcher + Sync),
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72 ignore_fn: IgnoreFnType<'a>,
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73 outcome: Mutex<DirstateStatus<'tree>>,
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74 }
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75
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76 impl<'tree, 'a> StatusCommon<'tree, 'a> {
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77 fn read_dir(
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78 &self,
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79 hg_path: &HgPath,
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80 fs_path: &Path,
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81 is_at_repo_root: bool,
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82 ) -> Result<Vec<DirEntry>, ()> {
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83 DirEntry::read_dir(fs_path, is_at_repo_root).map_err(|error| {
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84 let errno = error.raw_os_error().expect("expected real OS error");
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85 self.outcome
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86 .lock()
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87 .unwrap()
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88 .bad
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89 .push((hg_path.to_owned().into(), BadMatch::OsError(errno)))
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90 })
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91 }
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92
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93 fn traverse_fs_directory_and_dirstate(
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94 &self,
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95 has_ignored_ancestor: bool,
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96 dirstate_nodes: &'tree ChildNodes,
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97 directory_hg_path: &'tree HgPath,
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98 directory_fs_path: &Path,
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99 is_at_repo_root: bool,
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100 ) {
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101 let mut fs_entries = if let Ok(entries) = self.read_dir(
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102 directory_hg_path,
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103 directory_fs_path,
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104 is_at_repo_root,
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105 ) {
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106 entries
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107 } else {
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108 return;
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109 };
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110
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111 // `merge_join_by` requires both its input iterators to be sorted:
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112
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113 let dirstate_nodes = Node::sorted(dirstate_nodes);
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114 // `sort_unstable_by_key` doesn’t allow keys borrowing from the value:
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115 // https://github.com/rust-lang/rust/issues/34162
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116 fs_entries.sort_unstable_by(|e1, e2| e1.base_name.cmp(&e2.base_name));
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117
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118 itertools::merge_join_by(
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119 dirstate_nodes,
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120 &fs_entries,
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121 |(full_path, _node), fs_entry| {
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122 full_path.base_name().cmp(&fs_entry.base_name)
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123 },
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124 )
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125 .par_bridge()
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126 .for_each(|pair| {
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127 use itertools::EitherOrBoth::*;
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128 match pair {
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129 Both((hg_path, dirstate_node), fs_entry) => {
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130 self.traverse_fs_and_dirstate(
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131 fs_entry,
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132 hg_path.full_path(),
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133 dirstate_node,
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134 has_ignored_ancestor,
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135 );
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136 }
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137 Left((hg_path, dirstate_node)) => self.traverse_dirstate_only(
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138 hg_path.full_path(),
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139 dirstate_node,
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140 ),
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141 Right(fs_entry) => self.traverse_fs_only(
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142 has_ignored_ancestor,
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143 directory_hg_path,
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144 fs_entry,
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145 ),
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146 }
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147 })
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148 }
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149
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150 fn traverse_fs_and_dirstate(
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151 &self,
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152 fs_entry: &DirEntry,
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153 hg_path: &'tree HgPath,
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154 dirstate_node: &'tree Node,
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155 has_ignored_ancestor: bool,
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156 ) {
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157 let file_type = fs_entry.metadata.file_type();
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158 let file_or_symlink = file_type.is_file() || file_type.is_symlink();
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159 if !file_or_symlink {
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160 // If we previously had a file here, it was removed (with
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161 // `hg rm` or similar) or deleted before it could be
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162 // replaced by a directory or something else.
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163 self.mark_removed_or_deleted_if_file(
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164 hg_path,
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165 dirstate_node.state(),
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166 );
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167 }
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168 if file_type.is_dir() {
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169 if self.options.collect_traversed_dirs {
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170 self.outcome.lock().unwrap().traversed.push(hg_path.into())
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171 }
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172 let is_ignored = has_ignored_ancestor || (self.ignore_fn)(hg_path);
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173 let is_at_repo_root = false;
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174 self.traverse_fs_directory_and_dirstate(
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175 is_ignored,
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176 &dirstate_node.children,
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177 hg_path,
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178 &fs_entry.full_path,
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179 is_at_repo_root,
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180 );
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181 } else {
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182 if file_or_symlink && self.matcher.matches(hg_path) {
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183 let full_path = Cow::from(hg_path);
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184 if let Some(entry) = &dirstate_node.entry {
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185 match entry.state {
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186 EntryState::Added => {
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187 self.outcome.lock().unwrap().added.push(full_path)
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188 }
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189 EntryState::Removed => self
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190 .outcome
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191 .lock()
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192 .unwrap()
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193 .removed
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194 .push(full_path),
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195 EntryState::Merged => self
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196 .outcome
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197 .lock()
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198 .unwrap()
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199 .modified
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200 .push(full_path),
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201 EntryState::Normal => {
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202 self.handle_normal_file(
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203 full_path,
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204 dirstate_node,
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205 entry,
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206 fs_entry,
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207 );
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208 }
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209 // This variant is not used in DirstateMap
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210 // nodes
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211 EntryState::Unknown => unreachable!(),
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212 }
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213 } else {
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214 // `node.entry.is_none()` indicates a "directory"
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215 // node, but the filesystem has a file
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216 self.mark_unknown_or_ignored(
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217 has_ignored_ancestor,
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218 full_path,
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219 )
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220 }
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221 }
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222
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223 for (child_hg_path, child_node) in &dirstate_node.children {
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224 self.traverse_dirstate_only(
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225 child_hg_path.full_path(),
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226 child_node,
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227 )
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228 }
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229 }
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230 }
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231
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232 /// A file with `EntryState::Normal` in the dirstate was found in the
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233 /// filesystem
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234 fn handle_normal_file(
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235 &self,
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236 full_path: Cow<'tree, HgPath>,
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237 dirstate_node: &Node,
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238 entry: &crate::DirstateEntry,
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239 fs_entry: &DirEntry,
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240 ) {
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241 // Keep the low 31 bits
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242 fn truncate_u64(value: u64) -> i32 {
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243 (value & 0x7FFF_FFFF) as i32
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244 }
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245 fn truncate_i64(value: i64) -> i32 {
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246 (value & 0x7FFF_FFFF) as i32
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247 }
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248
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249 let mode_changed = || {
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250 self.options.check_exec && entry.mode_changed(&fs_entry.metadata)
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251 };
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252 let size_changed = entry.size != truncate_u64(fs_entry.metadata.len());
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253 if entry.size >= 0
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254 && size_changed
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255 && fs_entry.metadata.file_type().is_symlink()
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256 {
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257 // issue6456: Size returned may be longer due to encryption
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258 // on EXT-4 fscrypt. TODO maybe only do it on EXT4?
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259 self.outcome.lock().unwrap().unsure.push(full_path)
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260 } else if dirstate_node.copy_source.is_some()
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261 || entry.is_from_other_parent()
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262 || (entry.size >= 0 && (size_changed || mode_changed()))
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263 {
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264 self.outcome.lock().unwrap().modified.push(full_path)
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265 } else {
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266 let mtime = mtime_seconds(&fs_entry.metadata);
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267 if truncate_i64(mtime) != entry.mtime
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268 || mtime == self.options.last_normal_time
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269 {
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270 self.outcome.lock().unwrap().unsure.push(full_path)
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271 } else if self.options.list_clean {
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272 self.outcome.lock().unwrap().clean.push(full_path)
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273 }
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274 }
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275 }
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276
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277 /// A node in the dirstate tree has no corresponding filesystem entry
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278 fn traverse_dirstate_only(
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279 &self,
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280 hg_path: &'tree HgPath,
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281 dirstate_node: &'tree Node,
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282 ) {
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283 self.mark_removed_or_deleted_if_file(hg_path, dirstate_node.state());
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284 dirstate_node.children.par_iter().for_each(
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285 |(child_hg_path, child_node)| {
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286 self.traverse_dirstate_only(
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287 child_hg_path.full_path(),
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288 child_node,
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289 )
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290 },
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291 )
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292 }
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293
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294 /// A node in the dirstate tree has no corresponding *file* on the
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295 /// filesystem
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296 ///
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297 /// Does nothing on a "directory" node
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298 fn mark_removed_or_deleted_if_file(
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299 &self,
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300 hg_path: &'tree HgPath,
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301 dirstate_node_state: Option<EntryState>,
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302 ) {
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303 if let Some(state) = dirstate_node_state {
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304 if self.matcher.matches(hg_path) {
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305 if let EntryState::Removed = state {
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306 self.outcome.lock().unwrap().removed.push(hg_path.into())
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307 } else {
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308 self.outcome.lock().unwrap().deleted.push(hg_path.into())
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309 }
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310 }
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311 }
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312 }
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313
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314 /// Something in the filesystem has no corresponding dirstate node
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315 fn traverse_fs_only(
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316 &self,
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317 has_ignored_ancestor: bool,
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318 directory_hg_path: &HgPath,
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319 fs_entry: &DirEntry,
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320 ) {
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321 let hg_path = directory_hg_path.join(&fs_entry.base_name);
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322 let file_type = fs_entry.metadata.file_type();
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323 let file_or_symlink = file_type.is_file() || file_type.is_symlink();
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324 if file_type.is_dir() {
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325 let is_ignored =
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326 has_ignored_ancestor || (self.ignore_fn)(&hg_path);
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327 let traverse_children = if is_ignored {
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328 // Descendants of an ignored directory are all ignored
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329 self.options.list_ignored
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330 } else {
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331 // Descendants of an unknown directory may be either unknown or
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332 // ignored
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333 self.options.list_unknown || self.options.list_ignored
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334 };
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335 if traverse_children {
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336 let is_at_repo_root = false;
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337 if let Ok(children_fs_entries) = self.read_dir(
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338 &hg_path,
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diff changeset
339 &fs_entry.full_path,
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diff changeset
340 is_at_repo_root,
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diff changeset
341 ) {
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342 children_fs_entries.par_iter().for_each(|child_fs_entry| {
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343 self.traverse_fs_only(
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diff changeset
344 is_ignored,
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diff changeset
345 &hg_path,
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346 child_fs_entry,
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347 )
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348 })
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349 }
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350 }
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351 if self.options.collect_traversed_dirs {
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diff changeset
352 self.outcome.lock().unwrap().traversed.push(hg_path.into())
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353 }
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354 } else if file_or_symlink && self.matcher.matches(&hg_path) {
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diff changeset
355 self.mark_unknown_or_ignored(has_ignored_ancestor, hg_path.into())
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356 }
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357 }
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358
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359 fn mark_unknown_or_ignored(
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360 &self,
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361 has_ignored_ancestor: bool,
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362 hg_path: Cow<'tree, HgPath>,
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363 ) {
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364 let is_ignored = has_ignored_ancestor || (self.ignore_fn)(&hg_path);
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365 if is_ignored {
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366 if self.options.list_ignored {
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367 self.outcome.lock().unwrap().ignored.push(hg_path)
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368 }
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369 } else {
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370 if self.options.list_unknown {
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371 self.outcome.lock().unwrap().unknown.push(hg_path)
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372 }
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373 }
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374 }
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375 }
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376
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377 #[cfg(unix)] // TODO
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378 fn mtime_seconds(metadata: &std::fs::Metadata) -> i64 {
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379 // Going through `Metadata::modified()` would be portable, but would take
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380 // care to construct a `SystemTime` value with sub-second precision just
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381 // for us to throw that away here.
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382 use std::os::unix::fs::MetadataExt;
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383 metadata.mtime()
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384 }
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385
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386 struct DirEntry {
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387 base_name: HgPathBuf,
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388 full_path: PathBuf,
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389 metadata: std::fs::Metadata,
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390 }
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391
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392 impl DirEntry {
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393 /// Returns **unsorted** entries in the given directory, with name and
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394 /// metadata.
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395 ///
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396 /// If a `.hg` sub-directory is encountered:
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397 ///
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398 /// * At the repository root, ignore that sub-directory
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399 /// * Elsewhere, we’re listing the content of a sub-repo. Return an empty
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400 /// list instead.
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401 fn read_dir(path: &Path, is_at_repo_root: bool) -> io::Result<Vec<Self>> {
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402 let mut results = Vec::new();
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403 for entry in path.read_dir()? {
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404 let entry = entry?;
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405 let metadata = entry.metadata()?;
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406 let name = get_bytes_from_os_string(entry.file_name());
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407 // FIXME don't do this when cached
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408 if name == b".hg" {
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409 if is_at_repo_root {
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410 // Skip the repo’s own .hg (might be a symlink)
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411 continue;
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412 } else if metadata.is_dir() {
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413 // A .hg sub-directory at another location means a subrepo,
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414 // skip it entirely.
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415 return Ok(Vec::new());
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416 }
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417 }
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418 results.push(DirEntry {
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419 base_name: name.into(),
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420 full_path: entry.path(),
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421 metadata,
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422 })
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423 }
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424 Ok(results)
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425 }
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426 }