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annotate rust/hg-core/src/dirstate_tree/status.rs @ 47129:1b4f0f819f92

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dirstate-tree: Handle I/O errors in status Errors such as insufficient permissions when listing a directory are logged, and the algorithm continues without considering that directory. Differential Revision: https://phab.mercurial-scm.org/D10549
author Simon Sapin <simon.sapin@octobus.net>
date Mon, 26 Apr 2021 19:28:56 +0200
parents aeb03758f37a
children 60d852ae7e7b
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 std::borrow::Cow;
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17 use std::io;
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18 use std::path::Path;
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19 use std::path::PathBuf;
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20
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21 /// Returns the status of the working directory compared to its parent
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22 /// changeset.
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23 ///
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24 /// This algorithm is based on traversing the filesystem tree (`fs` in function
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25 /// and variable names) and dirstate tree at the same time. The core of this
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26 /// traversal is the recursive `traverse_fs_directory_and_dirstate` function
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27 /// and its use of `itertools::merge_join_by`. When reaching a path that only
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28 /// exists in one of the two trees, depending on information requested by
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29 /// `options` we may need to traverse the remaining subtree.
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30 pub fn status<'tree>(
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31 dmap: &'tree mut DirstateMap,
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32 matcher: &(dyn Matcher + Sync),
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33 root_dir: PathBuf,
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34 ignore_files: Vec<PathBuf>,
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35 options: StatusOptions,
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36 ) -> Result<(DirstateStatus<'tree>, Vec<PatternFileWarning>), StatusError> {
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37 let (ignore_fn, warnings): (IgnoreFnType, _) =
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38 if options.list_ignored || options.list_unknown {
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39 get_ignore_function(ignore_files, &root_dir)?
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40 } else {
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41 (Box::new(|&_| true), vec![])
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42 };
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43
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44 let mut common = StatusCommon {
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45 options,
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46 matcher,
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47 ignore_fn,
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48 outcome: DirstateStatus::default(),
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49 };
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50 let is_at_repo_root = true;
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51 let hg_path = HgPath::new("");
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52 let has_ignored_ancestor = false;
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53 common.traverse_fs_directory_and_dirstate(
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54 has_ignored_ancestor,
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55 &mut dmap.root,
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56 hg_path,
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57 &root_dir,
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58 is_at_repo_root,
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59 );
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60 Ok((common.outcome, warnings))
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61 }
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62
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63 /// Bag of random things needed by various parts of the algorithm. Reduces the
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64 /// number of parameters passed to functions.
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65 struct StatusCommon<'tree, 'a> {
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66 options: StatusOptions,
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67 matcher: &'a (dyn Matcher + Sync),
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68 ignore_fn: IgnoreFnType<'a>,
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69 outcome: DirstateStatus<'tree>,
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70 }
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71
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72 impl<'tree, 'a> StatusCommon<'tree, 'a> {
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73 fn read_dir(
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74 &mut self,
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75 hg_path: &HgPath,
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76 fs_path: &Path,
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77 is_at_repo_root: bool,
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78 ) -> Result<Vec<DirEntry>, ()> {
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79 DirEntry::read_dir(fs_path, is_at_repo_root).map_err(|error| {
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80 let errno = error.raw_os_error().expect("expected real OS error");
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81 self.outcome
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82 .bad
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83 .push((hg_path.to_owned().into(), BadMatch::OsError(errno)))
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84 })
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85 }
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86
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87 fn traverse_fs_directory_and_dirstate(
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88 &mut self,
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89 has_ignored_ancestor: bool,
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90 dirstate_nodes: &'tree mut ChildNodes,
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91 directory_hg_path: &'tree HgPath,
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92 directory_fs_path: &Path,
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93 is_at_repo_root: bool,
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94 ) {
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95 let mut fs_entries = if let Ok(entries) = self.read_dir(
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96 directory_hg_path,
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97 directory_fs_path,
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98 is_at_repo_root,
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99 ) {
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100 entries
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101 } else {
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102 return;
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103 };
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104
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105 // `merge_join_by` requires both its input iterators to be sorted:
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106
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107 // * `BTreeMap` iterates according to keys’ ordering by definition
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108
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109 // `sort_unstable_by_key` doesn’t allow keys borrowing from the value:
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110 // https://github.com/rust-lang/rust/issues/34162
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111 fs_entries.sort_unstable_by(|e1, e2| e1.base_name.cmp(&e2.base_name));
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112
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113 for pair in itertools::merge_join_by(
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114 dirstate_nodes,
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115 &fs_entries,
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116 |(full_path, _node), fs_entry| {
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117 full_path.base_name().cmp(&fs_entry.base_name)
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118 },
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119 ) {
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120 use itertools::EitherOrBoth::*;
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121 match pair {
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122 Both((hg_path, dirstate_node), fs_entry) => {
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123 self.traverse_fs_and_dirstate(
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124 fs_entry,
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125 hg_path.full_path(),
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126 dirstate_node,
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127 has_ignored_ancestor,
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128 );
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129 }
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130 Left((hg_path, dirstate_node)) => self.traverse_dirstate_only(
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131 hg_path.full_path(),
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132 dirstate_node,
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133 ),
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134 Right(fs_entry) => self.traverse_fs_only(
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135 has_ignored_ancestor,
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136 directory_hg_path,
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137 fs_entry,
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138 ),
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139 }
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140 }
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141 }
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142
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143 fn traverse_fs_and_dirstate(
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144 &mut self,
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145 fs_entry: &DirEntry,
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146 hg_path: &'tree HgPath,
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147 dirstate_node: &'tree mut Node,
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148 has_ignored_ancestor: bool,
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149 ) {
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150 let file_type = fs_entry.metadata.file_type();
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151 let file_or_symlink = file_type.is_file() || file_type.is_symlink();
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152 if !file_or_symlink {
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153 // If we previously had a file here, it was removed (with
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154 // `hg rm` or similar) or deleted before it could be
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155 // replaced by a directory or something else.
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156 self.mark_removed_or_deleted_if_file(
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157 hg_path,
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158 dirstate_node.state(),
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159 );
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160 }
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161 if file_type.is_dir() {
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162 if self.options.collect_traversed_dirs {
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163 self.outcome.traversed.push(hg_path.into())
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164 }
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165 let is_ignored = has_ignored_ancestor || (self.ignore_fn)(hg_path);
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166 let is_at_repo_root = false;
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167 self.traverse_fs_directory_and_dirstate(
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168 is_ignored,
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169 &mut dirstate_node.children,
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170 hg_path,
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171 &fs_entry.full_path,
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172 is_at_repo_root,
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173 );
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174 } else {
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175 if file_or_symlink && self.matcher.matches(hg_path) {
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176 let full_path = Cow::from(hg_path);
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177 if let Some(entry) = &dirstate_node.entry {
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178 match entry.state {
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179 EntryState::Added => {
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180 self.outcome.added.push(full_path)
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181 }
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182 EntryState::Removed => {
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183 self.outcome.removed.push(full_path)
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184 }
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185 EntryState::Merged => {
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186 self.outcome.modified.push(full_path)
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187 }
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188 EntryState::Normal => {
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189 self.handle_normal_file(
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190 full_path,
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191 dirstate_node,
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192 entry,
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193 fs_entry,
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194 );
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195 }
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196 // This variant is not used in DirstateMap
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197 // nodes
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198 EntryState::Unknown => unreachable!(),
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199 }
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200 } else {
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201 // `node.entry.is_none()` indicates a "directory"
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202 // node, but the filesystem has a file
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203 self.mark_unknown_or_ignored(
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204 has_ignored_ancestor,
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205 full_path,
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206 )
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207 }
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208 }
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209
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210 for (child_hg_path, child_node) in &mut dirstate_node.children {
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211 self.traverse_dirstate_only(
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212 child_hg_path.full_path(),
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213 child_node,
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214 )
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215 }
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216 }
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217 }
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218
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219 /// A file with `EntryState::Normal` in the dirstate was found in the
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220 /// filesystem
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221 fn handle_normal_file(
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222 &mut self,
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223 full_path: Cow<'tree, HgPath>,
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224 dirstate_node: &Node,
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225 entry: &crate::DirstateEntry,
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226 fs_entry: &DirEntry,
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227 ) {
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228 // Keep the low 31 bits
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229 fn truncate_u64(value: u64) -> i32 {
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230 (value & 0x7FFF_FFFF) as i32
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231 }
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232 fn truncate_i64(value: i64) -> i32 {
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233 (value & 0x7FFF_FFFF) as i32
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234 }
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235
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236 let mode_changed = || {
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237 self.options.check_exec && entry.mode_changed(&fs_entry.metadata)
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238 };
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239 let size_changed = entry.size != truncate_u64(fs_entry.metadata.len());
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240 if entry.size >= 0
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241 && size_changed
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242 && fs_entry.metadata.file_type().is_symlink()
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243 {
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244 // issue6456: Size returned may be longer due to encryption
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245 // on EXT-4 fscrypt. TODO maybe only do it on EXT4?
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246 self.outcome.unsure.push(full_path)
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247 } else if dirstate_node.copy_source.is_some()
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248 || entry.is_from_other_parent()
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249 || (entry.size >= 0 && (size_changed || mode_changed()))
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250 {
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251 self.outcome.modified.push(full_path)
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252 } else {
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253 let mtime = mtime_seconds(&fs_entry.metadata);
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254 if truncate_i64(mtime) != entry.mtime
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255 || mtime == self.options.last_normal_time
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256 {
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257 self.outcome.unsure.push(full_path)
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258 } else if self.options.list_clean {
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259 self.outcome.clean.push(full_path)
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260 }
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261 }
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262 }
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263
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264 /// A node in the dirstate tree has no corresponding filesystem entry
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265 fn traverse_dirstate_only(
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266 &mut self,
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267 hg_path: &'tree HgPath,
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268 dirstate_node: &'tree mut Node,
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269 ) {
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270 self.mark_removed_or_deleted_if_file(hg_path, dirstate_node.state());
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271 for (child_hg_path, child_node) in &mut dirstate_node.children {
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272 self.traverse_dirstate_only(child_hg_path.full_path(), child_node)
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273 }
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274 }
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275
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276 /// A node in the dirstate tree has no corresponding *file* on the
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277 /// filesystem
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278 ///
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279 /// Does nothing on a "directory" node
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280 fn mark_removed_or_deleted_if_file(
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281 &mut self,
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282 hg_path: &'tree HgPath,
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283 dirstate_node_state: Option<EntryState>,
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284 ) {
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285 if let Some(state) = dirstate_node_state {
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286 if self.matcher.matches(hg_path) {
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287 if let EntryState::Removed = state {
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288 self.outcome.removed.push(hg_path.into())
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289 } else {
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290 self.outcome.deleted.push(hg_path.into())
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291 }
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292 }
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293 }
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294 }
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295
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296 /// Something in the filesystem has no corresponding dirstate node
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297 fn traverse_fs_only(
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298 &mut self,
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299 has_ignored_ancestor: bool,
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300 directory_hg_path: &HgPath,
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301 fs_entry: &DirEntry,
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302 ) {
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303 let hg_path = directory_hg_path.join(&fs_entry.base_name);
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304 let file_type = fs_entry.metadata.file_type();
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305 let file_or_symlink = file_type.is_file() || file_type.is_symlink();
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306 if file_type.is_dir() {
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307 let is_ignored =
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308 has_ignored_ancestor || (self.ignore_fn)(&hg_path);
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309 let traverse_children = if is_ignored {
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310 // Descendants of an ignored directory are all ignored
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311 self.options.list_ignored
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312 } else {
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313 // Descendants of an unknown directory may be either unknown or
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314 // ignored
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315 self.options.list_unknown || self.options.list_ignored
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316 };
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317 if traverse_children {
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318 let is_at_repo_root = false;
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319 if let Ok(children_fs_entries) = self.read_dir(
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320 &hg_path,
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321 &fs_entry.full_path,
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322 is_at_repo_root,
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323 ) {
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324 for child_fs_entry in children_fs_entries {
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325 self.traverse_fs_only(
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326 is_ignored,
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327 &hg_path,
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328 &child_fs_entry,
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329 )
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330 }
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331 }
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332 }
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333 if self.options.collect_traversed_dirs {
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334 self.outcome.traversed.push(hg_path.into())
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335 }
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336 } else if file_or_symlink && self.matcher.matches(&hg_path) {
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337 self.mark_unknown_or_ignored(has_ignored_ancestor, hg_path.into())
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338 }
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339 }
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340
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341 fn mark_unknown_or_ignored(
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342 &mut self,
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343 has_ignored_ancestor: bool,
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344 hg_path: Cow<'tree, HgPath>,
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345 ) {
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346 let is_ignored = has_ignored_ancestor || (self.ignore_fn)(&hg_path);
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347 if is_ignored {
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348 if self.options.list_ignored {
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349 self.outcome.ignored.push(hg_path)
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350 }
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351 } else {
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352 if self.options.list_unknown {
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353 self.outcome.unknown.push(hg_path)
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354 }
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355 }
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356 }
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357 }
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358
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359 #[cfg(unix)] // TODO
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360 fn mtime_seconds(metadata: &std::fs::Metadata) -> i64 {
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361 // Going through `Metadata::modified()` would be portable, but would take
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362 // care to construct a `SystemTime` value with sub-second precision just
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363 // for us to throw that away here.
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364 use std::os::unix::fs::MetadataExt;
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365 metadata.mtime()
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366 }
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367
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368 struct DirEntry {
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369 base_name: HgPathBuf,
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370 full_path: PathBuf,
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371 metadata: std::fs::Metadata,
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372 }
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373
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374 impl DirEntry {
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375 /// Returns **unsorted** entries in the given directory, with name and
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376 /// metadata.
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377 ///
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378 /// If a `.hg` sub-directory is encountered:
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379 ///
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380 /// * At the repository root, ignore that sub-directory
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381 /// * Elsewhere, we’re listing the content of a sub-repo. Return an empty
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382 /// list instead.
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383 fn read_dir(path: &Path, is_at_repo_root: bool) -> io::Result<Vec<Self>> {
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384 let mut results = Vec::new();
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385 for entry in path.read_dir()? {
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386 let entry = entry?;
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387 let metadata = entry.metadata()?;
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388 let name = get_bytes_from_os_string(entry.file_name());
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389 // FIXME don't do this when cached
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390 if name == b".hg" {
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391 if is_at_repo_root {
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392 // Skip the repo’s own .hg (might be a symlink)
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393 continue;
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394 } else if metadata.is_dir() {
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395 // A .hg sub-directory at another location means a subrepo,
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396 // skip it entirely.
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397 return Ok(Vec::new());
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398 }
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399 }
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400 results.push(DirEntry {
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401 base_name: name.into(),
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402 full_path: entry.path(),
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403 metadata,
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404 })
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405 }
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406 Ok(results)
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407 }
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408 }