author | Simon Sapin <simon.sapin@octobus.net> |
Mon, 26 Apr 2021 19:16:23 +0200 | |
changeset 47128 | aeb03758f37a |
parent 47127 | be579775c2d9 |
child 47129 | 1b4f0f819f92 |
permissions | -rw-r--r-- |
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1 |
use crate::dirstate::status::IgnoreFnType; |
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use crate::dirstate_tree::dirstate_map::ChildNodes; |
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use crate::dirstate_tree::dirstate_map::DirstateMap; |
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use crate::dirstate_tree::dirstate_map::Node; |
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use crate::matchers::get_ignore_function; |
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use crate::matchers::Matcher; |
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use crate::utils::files::get_bytes_from_os_string; |
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use crate::utils::hg_path::HgPath; |
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use crate::DirstateStatus; |
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use crate::EntryState; |
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use crate::HgPathBuf; |
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use crate::PatternFileWarning; |
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use crate::StatusError; |
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use crate::StatusOptions; |
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use std::borrow::Cow; |
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use std::io; |
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use std::path::Path; |
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use std::path::PathBuf; |
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/// Returns the status of the working directory compared to its parent |
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/// changeset. |
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/// |
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/// This algorithm is based on traversing the filesystem tree (`fs` in function |
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/// and variable names) and dirstate tree at the same time. The core of this |
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/// traversal is the recursive `traverse_fs_directory_and_dirstate` function |
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/// and its use of `itertools::merge_join_by`. When reaching a path that only |
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/// exists in one of the two trees, depending on information requested by |
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/// `options` we may need to traverse the remaining subtree. |
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pub fn status<'tree>( |
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dmap: &'tree mut DirstateMap, |
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matcher: &(dyn Matcher + Sync), |
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root_dir: PathBuf, |
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ignore_files: Vec<PathBuf>, |
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options: StatusOptions, |
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) -> Result<(DirstateStatus<'tree>, Vec<PatternFileWarning>), StatusError> { |
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let (ignore_fn, warnings): (IgnoreFnType, _) = |
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if options.list_ignored || options.list_unknown { |
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get_ignore_function(ignore_files, &root_dir)? |
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} else { |
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(Box::new(|&_| true), vec![]) |
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}; |
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let mut common = StatusCommon { |
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options, |
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matcher, |
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ignore_fn, |
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outcome: DirstateStatus::default(), |
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}; |
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let is_at_repo_root = true; |
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let hg_path = HgPath::new(""); |
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let has_ignored_ancestor = false; |
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common.traverse_fs_directory_and_dirstate( |
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has_ignored_ancestor, |
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&mut dmap.root, |
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hg_path, |
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&root_dir, |
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is_at_repo_root, |
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); |
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Ok((common.outcome, warnings)) |
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} |
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/// Bag of random things needed by various parts of the algorithm. Reduces the |
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/// number of parameters passed to functions. |
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struct StatusCommon<'tree, 'a> { |
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options: StatusOptions, |
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matcher: &'a (dyn Matcher + Sync), |
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ignore_fn: IgnoreFnType<'a>, |
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outcome: DirstateStatus<'tree>, |
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} |
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70 |
|
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impl<'tree, 'a> StatusCommon<'tree, 'a> { |
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fn traverse_fs_directory_and_dirstate( |
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&mut self, |
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has_ignored_ancestor: bool, |
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dirstate_nodes: &'tree mut ChildNodes, |
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directory_hg_path: &HgPath, |
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fs_path: &Path, |
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is_at_repo_root: bool, |
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) { |
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// TODO: handle I/O errors |
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let mut fs_entries = |
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DirEntry::read_dir(fs_path, is_at_repo_root).unwrap(); |
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// `merge_join_by` requires both its input iterators to be sorted: |
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85 |
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// * `BTreeMap` iterates according to keys’ ordering by definition |
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87 |
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// `sort_unstable_by_key` doesn’t allow keys borrowing from the value: |
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// https://github.com/rust-lang/rust/issues/34162 |
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fs_entries.sort_unstable_by(|e1, e2| e1.base_name.cmp(&e2.base_name)); |
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for pair in itertools::merge_join_by( |
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dirstate_nodes, |
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&fs_entries, |
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|(full_path, _node), fs_entry| { |
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full_path.base_name().cmp(&fs_entry.base_name) |
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}, |
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) { |
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use itertools::EitherOrBoth::*; |
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match pair { |
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101 |
Both((hg_path, dirstate_node), fs_entry) => { |
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102 |
self.traverse_fs_and_dirstate( |
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103 |
fs_entry, |
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104 |
hg_path.full_path(), |
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105 |
dirstate_node, |
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106 |
has_ignored_ancestor, |
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107 |
); |
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108 |
} |
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109 |
Left((hg_path, dirstate_node)) => self.traverse_dirstate_only( |
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110 |
hg_path.full_path(), |
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111 |
dirstate_node, |
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112 |
), |
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113 |
Right(fs_entry) => self.traverse_fs_only( |
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114 |
has_ignored_ancestor, |
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115 |
directory_hg_path, |
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116 |
fs_entry, |
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117 |
), |
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118 |
} |
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119 |
} |
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120 |
} |
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121 |
|
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122 |
fn traverse_fs_and_dirstate( |
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123 |
&mut self, |
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124 |
fs_entry: &DirEntry, |
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125 |
hg_path: &'tree HgPath, |
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126 |
dirstate_node: &'tree mut Node, |
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127 |
has_ignored_ancestor: bool, |
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128 |
) { |
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129 |
let file_type = fs_entry.metadata.file_type(); |
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130 |
let file_or_symlink = file_type.is_file() || file_type.is_symlink(); |
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131 |
if !file_or_symlink { |
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132 |
// If we previously had a file here, it was removed (with |
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133 |
// `hg rm` or similar) or deleted before it could be |
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134 |
// replaced by a directory or something else. |
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135 |
self.mark_removed_or_deleted_if_file( |
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136 |
hg_path, |
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137 |
dirstate_node.state(), |
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138 |
); |
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139 |
} |
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140 |
if file_type.is_dir() { |
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141 |
if self.options.collect_traversed_dirs { |
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142 |
self.outcome.traversed.push(hg_path.into()) |
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143 |
} |
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144 |
let is_ignored = has_ignored_ancestor || (self.ignore_fn)(hg_path); |
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145 |
let is_at_repo_root = false; |
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146 |
self.traverse_fs_directory_and_dirstate( |
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147 |
is_ignored, |
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148 |
&mut dirstate_node.children, |
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149 |
hg_path, |
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150 |
&fs_entry.full_path, |
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151 |
is_at_repo_root, |
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152 |
); |
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153 |
} else { |
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154 |
if file_or_symlink && self.matcher.matches(hg_path) { |
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155 |
let full_path = Cow::from(hg_path); |
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156 |
if let Some(entry) = &dirstate_node.entry { |
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157 |
match entry.state { |
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158 |
EntryState::Added => { |
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159 |
self.outcome.added.push(full_path) |
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160 |
} |
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161 |
EntryState::Removed => { |
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162 |
self.outcome.removed.push(full_path) |
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163 |
} |
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164 |
EntryState::Merged => { |
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165 |
self.outcome.modified.push(full_path) |
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166 |
} |
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167 |
EntryState::Normal => { |
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168 |
self.handle_normal_file( |
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169 |
full_path, |
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170 |
dirstate_node, |
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171 |
entry, |
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172 |
fs_entry, |
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173 |
); |
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|
174 |
} |
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175 |
// This variant is not used in DirstateMap |
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176 |
// nodes |
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177 |
EntryState::Unknown => unreachable!(), |
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178 |
} |
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179 |
} else { |
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180 |
// `node.entry.is_none()` indicates a "directory" |
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181 |
// node, but the filesystem has a file |
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182 |
self.mark_unknown_or_ignored( |
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183 |
has_ignored_ancestor, |
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184 |
full_path, |
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|
185 |
) |
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186 |
} |
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187 |
} |
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|
188 |
|
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189 |
for (child_hg_path, child_node) in &mut dirstate_node.children { |
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190 |
self.traverse_dirstate_only( |
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191 |
child_hg_path.full_path(), |
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192 |
child_node, |
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193 |
) |
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194 |
} |
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195 |
} |
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196 |
} |
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|
197 |
|
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198 |
/// A file with `EntryState::Normal` in the dirstate was found in the |
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199 |
/// filesystem |
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200 |
fn handle_normal_file( |
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201 |
&mut self, |
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202 |
full_path: Cow<'tree, HgPath>, |
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203 |
dirstate_node: &Node, |
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204 |
entry: &crate::DirstateEntry, |
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205 |
fs_entry: &DirEntry, |
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) { |
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// Keep the low 31 bits |
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fn truncate_u64(value: u64) -> i32 { |
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(value & 0x7FFF_FFFF) as i32 |
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} |
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fn truncate_i64(value: i64) -> i32 { |
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(value & 0x7FFF_FFFF) as i32 |
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} |
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|
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let mode_changed = || { |
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self.options.check_exec && entry.mode_changed(&fs_entry.metadata) |
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}; |
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let size_changed = entry.size != truncate_u64(fs_entry.metadata.len()); |
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if entry.size >= 0 |
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&& size_changed |
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&& fs_entry.metadata.file_type().is_symlink() |
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{ |
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// issue6456: Size returned may be longer due to encryption |
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// on EXT-4 fscrypt. TODO maybe only do it on EXT4? |
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self.outcome.unsure.push(full_path) |
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} else if dirstate_node.copy_source.is_some() |
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|| entry.is_from_other_parent() |
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|| (entry.size >= 0 && (size_changed || mode_changed())) |
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{ |
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self.outcome.modified.push(full_path) |
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} else { |
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let mtime = mtime_seconds(&fs_entry.metadata); |
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if truncate_i64(mtime) != entry.mtime |
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|| mtime == self.options.last_normal_time |
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{ |
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self.outcome.unsure.push(full_path) |
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} else if self.options.list_clean { |
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self.outcome.clean.push(full_path) |
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} |
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} |
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241 |
} |
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242 |
|
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/// A node in the dirstate tree has no corresponding filesystem entry |
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fn traverse_dirstate_only( |
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&mut self, |
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hg_path: &'tree HgPath, |
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dirstate_node: &'tree mut Node, |
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) { |
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self.mark_removed_or_deleted_if_file(hg_path, dirstate_node.state()); |
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for (child_hg_path, child_node) in &mut dirstate_node.children { |
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self.traverse_dirstate_only(child_hg_path.full_path(), child_node) |
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252 |
} |
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253 |
} |
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254 |
|
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255 |
/// A node in the dirstate tree has no corresponding *file* on the |
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256 |
/// filesystem |
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257 |
/// |
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258 |
/// Does nothing on a "directory" node |
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259 |
fn mark_removed_or_deleted_if_file( |
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&mut self, |
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261 |
hg_path: &'tree HgPath, |
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262 |
dirstate_node_state: Option<EntryState>, |
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263 |
) { |
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264 |
if let Some(state) = dirstate_node_state { |
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if self.matcher.matches(hg_path) { |
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266 |
if let EntryState::Removed = state { |
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267 |
self.outcome.removed.push(hg_path.into()) |
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268 |
} else { |
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269 |
self.outcome.deleted.push(hg_path.into()) |
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270 |
} |
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271 |
} |
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272 |
} |
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273 |
} |
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274 |
|
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275 |
/// Something in the filesystem has no corresponding dirstate node |
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276 |
fn traverse_fs_only( |
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277 |
&mut self, |
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278 |
has_ignored_ancestor: bool, |
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279 |
directory_hg_path: &HgPath, |
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280 |
fs_entry: &DirEntry, |
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281 |
) { |
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282 |
let hg_path = directory_hg_path.join(&fs_entry.base_name); |
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283 |
let file_type = fs_entry.metadata.file_type(); |
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let file_or_symlink = file_type.is_file() || file_type.is_symlink(); |
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285 |
if file_type.is_dir() { |
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286 |
let is_ignored = |
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has_ignored_ancestor || (self.ignore_fn)(&hg_path); |
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288 |
let traverse_children = if is_ignored { |
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289 |
// Descendants of an ignored directory are all ignored |
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290 |
self.options.list_ignored |
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291 |
} else { |
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292 |
// Descendants of an unknown directory may be either unknown or |
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293 |
// ignored |
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294 |
self.options.list_unknown || self.options.list_ignored |
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295 |
}; |
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296 |
if traverse_children { |
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297 |
let is_at_repo_root = false; |
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298 |
// TODO: handle I/O errors |
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299 |
let children_fs_entries = |
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DirEntry::read_dir(&fs_entry.full_path, is_at_repo_root) |
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301 |
.unwrap(); |
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for child_fs_entry in children_fs_entries { |
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self.traverse_fs_only( |
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is_ignored, |
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305 |
&hg_path, |
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306 |
&child_fs_entry, |
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307 |
) |
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308 |
} |
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309 |
} |
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310 |
if self.options.collect_traversed_dirs { |
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self.outcome.traversed.push(hg_path.into()) |
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} |
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} else if file_or_symlink && self.matcher.matches(&hg_path) { |
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self.mark_unknown_or_ignored(has_ignored_ancestor, hg_path.into()) |
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315 |
} |
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316 |
} |
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317 |
|
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318 |
fn mark_unknown_or_ignored( |
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&mut self, |
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320 |
has_ignored_ancestor: bool, |
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321 |
hg_path: Cow<'tree, HgPath>, |
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322 |
) { |
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let is_ignored = has_ignored_ancestor || (self.ignore_fn)(&hg_path); |
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324 |
if is_ignored { |
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if self.options.list_ignored { |
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self.outcome.ignored.push(hg_path) |
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327 |
} |
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328 |
} else { |
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329 |
if self.options.list_unknown { |
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self.outcome.unknown.push(hg_path) |
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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 |
#[cfg(unix)] // TODO |
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337 |
fn mtime_seconds(metadata: &std::fs::Metadata) -> i64 { |
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338 |
// Going through `Metadata::modified()` would be portable, but would take |
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339 |
// care to construct a `SystemTime` value with sub-second precision just |
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340 |
// for us to throw that away here. |
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341 |
use std::os::unix::fs::MetadataExt; |
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342 |
metadata.mtime() |
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343 |
} |
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344 |
|
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345 |
struct DirEntry { |
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346 |
base_name: HgPathBuf, |
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347 |
full_path: PathBuf, |
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348 |
metadata: std::fs::Metadata, |
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349 |
} |
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350 |
|
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351 |
impl DirEntry { |
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352 |
/// Returns **unsorted** entries in the given directory, with name and |
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353 |
/// metadata. |
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354 |
/// |
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355 |
/// If a `.hg` sub-directory is encountered: |
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356 |
/// |
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357 |
/// * At the repository root, ignore that sub-directory |
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358 |
/// * Elsewhere, we’re listing the content of a sub-repo. Return an empty |
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359 |
/// list instead. |
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360 |
fn read_dir(path: &Path, is_at_repo_root: bool) -> io::Result<Vec<Self>> { |
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361 |
let mut results = Vec::new(); |
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362 |
for entry in path.read_dir()? { |
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363 |
let entry = entry?; |
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364 |
let metadata = entry.metadata()?; |
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let name = get_bytes_from_os_string(entry.file_name()); |
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366 |
// FIXME don't do this when cached |
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367 |
if name == b".hg" { |
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368 |
if is_at_repo_root { |
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369 |
// Skip the repo’s own .hg (might be a symlink) |
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370 |
continue; |
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371 |
} else if metadata.is_dir() { |
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372 |
// A .hg sub-directory at another location means a subrepo, |
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373 |
// skip it entirely. |
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374 |
return Ok(Vec::new()); |
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375 |
} |
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376 |
} |
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377 |
results.push(DirEntry { |
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378 |
base_name: name.into(), |
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379 |
full_path: entry.path(), |
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380 |
metadata, |
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381 |
}) |
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382 |
} |
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383 |
Ok(results) |
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|
384 |
} |
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385 |
} |