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annotate rust/hg-core/src/dirstate_tree/status.rs @ 47346:5e12b6bfdd3e

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dirstate-tree: Fix status algorithm with unreadable directory When reading a directory fails such as because of insufficient permissions, it should be treated as empty by status instead of skipped entirely. Differential Revision: https://phab.mercurial-scm.org/D10823
author Simon Sapin <simon.sapin@octobus.net>
date Fri, 28 May 2021 12:16:14 +0200
parents f27f2afb15da
children 73ddcedeaadf
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::ChildNodesRef;
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3 use crate::dirstate_tree::dirstate_map::DirstateMap;
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4 use crate::dirstate_tree::dirstate_map::NodeRef;
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5 use crate::dirstate_tree::on_disk::DirstateV2ParseError;
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6 use crate::matchers::get_ignore_function;
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7 use crate::matchers::Matcher;
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8 use crate::utils::files::get_bytes_from_os_string;
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9 use crate::utils::files::get_path_from_bytes;
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10 use crate::utils::hg_path::HgPath;
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11 use crate::BadMatch;
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12 use crate::DirstateStatus;
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13 use crate::EntryState;
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14 use crate::HgPathBuf;
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15 use crate::PatternFileWarning;
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16 use crate::StatusError;
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17 use crate::StatusOptions;
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18 use micro_timer::timed;
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19 use rayon::prelude::*;
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20 use std::borrow::Cow;
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21 use std::io;
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22 use std::path::Path;
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23 use std::path::PathBuf;
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24 use std::sync::Mutex;
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25
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26 /// Returns the status of the working directory compared to its parent
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27 /// changeset.
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28 ///
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29 /// This algorithm is based on traversing the filesystem tree (`fs` in function
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30 /// and variable names) and dirstate tree at the same time. The core of this
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31 /// traversal is the recursive `traverse_fs_directory_and_dirstate` function
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32 /// and its use of `itertools::merge_join_by`. When reaching a path that only
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33 /// exists in one of the two trees, depending on information requested by
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34 /// `options` we may need to traverse the remaining subtree.
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35 #[timed]
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36 pub fn status<'tree, 'on_disk: 'tree>(
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37 dmap: &'tree mut DirstateMap<'on_disk>,
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38 matcher: &(dyn Matcher + Sync),
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39 root_dir: PathBuf,
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40 ignore_files: Vec<PathBuf>,
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41 options: StatusOptions,
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42 ) -> Result<(DirstateStatus<'tree>, Vec<PatternFileWarning>), StatusError> {
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43 let (ignore_fn, warnings): (IgnoreFnType, _) =
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44 if options.list_ignored || options.list_unknown {
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45 get_ignore_function(ignore_files, &root_dir)?
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46 } else {
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47 (Box::new(|&_| true), vec![])
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48 };
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49
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50 let common = StatusCommon {
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51 dmap,
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52 options,
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53 matcher,
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54 ignore_fn,
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55 outcome: Mutex::new(DirstateStatus::default()),
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56 };
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57 let is_at_repo_root = true;
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58 let hg_path = HgPath::new("");
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59 let has_ignored_ancestor = false;
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60 common.traverse_fs_directory_and_dirstate(
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61 has_ignored_ancestor,
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62 dmap.root.as_ref(),
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63 hg_path,
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64 &root_dir,
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65 is_at_repo_root,
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66 )?;
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67 Ok((common.outcome.into_inner().unwrap(), warnings))
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68 }
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69
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70 /// Bag of random things needed by various parts of the algorithm. Reduces the
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71 /// number of parameters passed to functions.
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72 struct StatusCommon<'tree, 'a, 'on_disk: 'tree> {
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73 dmap: &'tree DirstateMap<'on_disk>,
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74 options: StatusOptions,
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75 matcher: &'a (dyn Matcher + Sync),
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76 ignore_fn: IgnoreFnType<'a>,
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77 outcome: Mutex<DirstateStatus<'tree>>,
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78 }
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79
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80 impl<'tree, 'a> StatusCommon<'tree, 'a, '_> {
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81 fn read_dir(
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82 &self,
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83 hg_path: &HgPath,
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84 fs_path: &Path,
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85 is_at_repo_root: bool,
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86 ) -> Result<Vec<DirEntry>, ()> {
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87 DirEntry::read_dir(fs_path, is_at_repo_root)
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88 .map_err(|error| self.io_error(error, hg_path))
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89 }
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90
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91 fn io_error(&self, error: std::io::Error, hg_path: &HgPath) {
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92 let errno = error.raw_os_error().expect("expected real OS error");
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93 self.outcome
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94 .lock()
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95 .unwrap()
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96 .bad
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97 .push((hg_path.to_owned().into(), BadMatch::OsError(errno)))
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98 }
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99
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100 fn traverse_fs_directory_and_dirstate(
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101 &self,
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102 has_ignored_ancestor: bool,
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103 dirstate_nodes: ChildNodesRef<'tree, '_>,
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104 directory_hg_path: &'tree HgPath,
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105 directory_fs_path: &Path,
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106 is_at_repo_root: bool,
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107 ) -> Result<(), DirstateV2ParseError> {
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108 if !self.options.list_unknown && !self.options.list_ignored {
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109 // We only care about files in the dirstate, so we can skip listing
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110 // filesystem directories entirely.
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111 return dirstate_nodes
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112 .par_iter()
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113 .map(|dirstate_node| {
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114 let fs_path = directory_fs_path.join(get_path_from_bytes(
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115 dirstate_node.base_name(self.dmap.on_disk)?.as_bytes(),
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116 ));
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117 match std::fs::symlink_metadata(&fs_path) {
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118 Ok(fs_metadata) => self.traverse_fs_and_dirstate(
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119 &fs_path,
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120 &fs_metadata,
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121 dirstate_node,
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122 has_ignored_ancestor,
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123 ),
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124 Err(e) if e.kind() == std::io::ErrorKind::NotFound => {
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125 self.traverse_dirstate_only(dirstate_node)
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126 }
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127 Err(error) => {
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128 let hg_path =
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129 dirstate_node.full_path(self.dmap.on_disk)?;
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130 Ok(self.io_error(error, hg_path))
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131 }
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132 }
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133 })
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134 .collect();
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135 }
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136
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137 let mut fs_entries = if let Ok(entries) = self.read_dir(
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138 directory_hg_path,
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139 directory_fs_path,
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140 is_at_repo_root,
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141 ) {
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142 entries
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143 } else {
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144 // Treat an unreadable directory (typically because of insufficient
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145 // permissions) like an empty directory. `self.read_dir` has
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146 // already called `self.io_error` so a warning will be emitted.
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147 Vec::new()
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148 };
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149
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150 // `merge_join_by` requires both its input iterators to be sorted:
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151
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152 let dirstate_nodes = dirstate_nodes.sorted();
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153 // `sort_unstable_by_key` doesn’t allow keys borrowing from the value:
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154 // https://github.com/rust-lang/rust/issues/34162
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155 fs_entries.sort_unstable_by(|e1, e2| e1.base_name.cmp(&e2.base_name));
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156
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157 // Propagate here any error that would happen inside the comparison
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158 // callback below
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159 for dirstate_node in &dirstate_nodes {
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160 dirstate_node.base_name(self.dmap.on_disk)?;
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161 }
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162 itertools::merge_join_by(
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163 dirstate_nodes,
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164 &fs_entries,
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165 |dirstate_node, fs_entry| {
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166 // This `unwrap` never panics because we already propagated
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167 // those errors above
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168 dirstate_node
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169 .base_name(self.dmap.on_disk)
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170 .unwrap()
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171 .cmp(&fs_entry.base_name)
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172 },
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173 )
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174 .par_bridge()
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175 .map(|pair| {
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176 use itertools::EitherOrBoth::*;
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177 match pair {
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178 Both(dirstate_node, fs_entry) => self
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179 .traverse_fs_and_dirstate(
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180 &fs_entry.full_path,
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181 &fs_entry.metadata,
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182 dirstate_node,
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183 has_ignored_ancestor,
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184 ),
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185 Left(dirstate_node) => {
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186 self.traverse_dirstate_only(dirstate_node)
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187 }
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188 Right(fs_entry) => Ok(self.traverse_fs_only(
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189 has_ignored_ancestor,
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190 directory_hg_path,
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191 fs_entry,
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192 )),
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193 }
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194 })
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195 .collect()
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196 }
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197
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198 fn traverse_fs_and_dirstate(
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199 &self,
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200 fs_path: &Path,
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201 fs_metadata: &std::fs::Metadata,
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202 dirstate_node: NodeRef<'tree, '_>,
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203 has_ignored_ancestor: bool,
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204 ) -> Result<(), DirstateV2ParseError> {
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205 let hg_path = dirstate_node.full_path(self.dmap.on_disk)?;
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206 let file_type = fs_metadata.file_type();
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207 let file_or_symlink = file_type.is_file() || file_type.is_symlink();
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208 if !file_or_symlink {
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209 // If we previously had a file here, it was removed (with
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210 // `hg rm` or similar) or deleted before it could be
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211 // replaced by a directory or something else.
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212 self.mark_removed_or_deleted_if_file(
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213 hg_path,
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214 dirstate_node.state()?,
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215 );
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216 }
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217 if file_type.is_dir() {
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218 if self.options.collect_traversed_dirs {
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219 self.outcome.lock().unwrap().traversed.push(hg_path.into())
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220 }
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221 let is_ignored = has_ignored_ancestor || (self.ignore_fn)(hg_path);
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222 let is_at_repo_root = false;
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223 self.traverse_fs_directory_and_dirstate(
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224 is_ignored,
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225 dirstate_node.children(self.dmap.on_disk)?,
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226 hg_path,
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227 fs_path,
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228 is_at_repo_root,
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229 )?
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230 } else {
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231 if file_or_symlink && self.matcher.matches(hg_path) {
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232 let full_path = Cow::from(hg_path);
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233 if let Some(state) = dirstate_node.state()? {
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234 match state {
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235 EntryState::Added => {
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236 self.outcome.lock().unwrap().added.push(full_path)
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237 }
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238 EntryState::Removed => self
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239 .outcome
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240 .lock()
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241 .unwrap()
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242 .removed
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243 .push(full_path),
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244 EntryState::Merged => self
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245 .outcome
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246 .lock()
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247 .unwrap()
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248 .modified
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249 .push(full_path),
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250 EntryState::Normal => self
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251 .handle_normal_file(&dirstate_node, fs_metadata)?,
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252 // This variant is not used in DirstateMap
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253 // nodes
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254 EntryState::Unknown => unreachable!(),
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255 }
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256 } else {
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257 // `node.entry.is_none()` indicates a "directory"
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258 // node, but the filesystem has a file
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259 self.mark_unknown_or_ignored(
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260 has_ignored_ancestor,
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261 full_path,
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262 )
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263 }
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264 }
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265
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266 for child_node in dirstate_node.children(self.dmap.on_disk)?.iter()
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267 {
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268 self.traverse_dirstate_only(child_node)?
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269 }
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270 }
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271 Ok(())
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272 }
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273
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274 /// A file with `EntryState::Normal` in the dirstate was found in the
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275 /// filesystem
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276 fn handle_normal_file(
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277 &self,
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278 dirstate_node: &NodeRef<'tree, '_>,
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279 fs_metadata: &std::fs::Metadata,
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280 ) -> Result<(), DirstateV2ParseError> {
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281 // Keep the low 31 bits
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282 fn truncate_u64(value: u64) -> i32 {
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283 (value & 0x7FFF_FFFF) as i32
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284 }
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285 fn truncate_i64(value: i64) -> i32 {
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286 (value & 0x7FFF_FFFF) as i32
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287 }
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288
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289 let entry = dirstate_node
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290 .entry()?
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291 .expect("handle_normal_file called with entry-less node");
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292 let full_path = Cow::from(dirstate_node.full_path(self.dmap.on_disk)?);
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293 let mode_changed =
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294 || self.options.check_exec && entry.mode_changed(fs_metadata);
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295 let size_changed = entry.size != truncate_u64(fs_metadata.len());
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296 if entry.size >= 0
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297 && size_changed
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298 && fs_metadata.file_type().is_symlink()
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299 {
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300 // issue6456: Size returned may be longer due to encryption
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301 // on EXT-4 fscrypt. TODO maybe only do it on EXT4?
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302 self.outcome.lock().unwrap().unsure.push(full_path)
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303 } else if dirstate_node.has_copy_source()
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304 || entry.is_from_other_parent()
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305 || (entry.size >= 0 && (size_changed || mode_changed()))
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306 {
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307 self.outcome.lock().unwrap().modified.push(full_path)
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308 } else {
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309 let mtime = mtime_seconds(fs_metadata);
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310 if truncate_i64(mtime) != entry.mtime
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311 || mtime == self.options.last_normal_time
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312 {
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313 self.outcome.lock().unwrap().unsure.push(full_path)
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314 } else if self.options.list_clean {
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315 self.outcome.lock().unwrap().clean.push(full_path)
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316 }
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317 }
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318 Ok(())
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319 }
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320
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321 /// A node in the dirstate tree has no corresponding filesystem entry
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322 fn traverse_dirstate_only(
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323 &self,
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324 dirstate_node: NodeRef<'tree, '_>,
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325 ) -> Result<(), DirstateV2ParseError> {
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326 self.mark_removed_or_deleted_if_file(
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327 dirstate_node.full_path(self.dmap.on_disk)?,
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328 dirstate_node.state()?,
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329 );
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330 dirstate_node
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331 .children(self.dmap.on_disk)?
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332 .par_iter()
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333 .map(|child_node| self.traverse_dirstate_only(child_node))
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334 .collect()
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335 }
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336
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337 /// A node in the dirstate tree has no corresponding *file* on the
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338 /// filesystem
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339 ///
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340 /// Does nothing on a "directory" node
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341 fn mark_removed_or_deleted_if_file(
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342 &self,
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343 hg_path: &'tree HgPath,
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344 dirstate_node_state: Option<EntryState>,
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345 ) {
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346 if let Some(state) = dirstate_node_state {
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347 if self.matcher.matches(hg_path) {
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348 if let EntryState::Removed = state {
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349 self.outcome.lock().unwrap().removed.push(hg_path.into())
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350 } else {
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351 self.outcome.lock().unwrap().deleted.push(hg_path.into())
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352 }
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353 }
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354 }
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355 }
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356
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357 /// Something in the filesystem has no corresponding dirstate node
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358 fn traverse_fs_only(
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359 &self,
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360 has_ignored_ancestor: bool,
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361 directory_hg_path: &HgPath,
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362 fs_entry: &DirEntry,
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363 ) {
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364 let hg_path = directory_hg_path.join(&fs_entry.base_name);
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365 let file_type = fs_entry.metadata.file_type();
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366 let file_or_symlink = file_type.is_file() || file_type.is_symlink();
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367 if file_type.is_dir() {
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368 let is_ignored =
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369 has_ignored_ancestor || (self.ignore_fn)(&hg_path);
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370 let traverse_children = if is_ignored {
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371 // Descendants of an ignored directory are all ignored
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diff changeset
372 self.options.list_ignored
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373 } else {
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374 // Descendants of an unknown directory may be either unknown or
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375 // ignored
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376 self.options.list_unknown || self.options.list_ignored
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377 };
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378 if traverse_children {
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379 let is_at_repo_root = false;
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380 if let Ok(children_fs_entries) = self.read_dir(
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381 &hg_path,
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diff changeset
382 &fs_entry.full_path,
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383 is_at_repo_root,
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384 ) {
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385 children_fs_entries.par_iter().for_each(|child_fs_entry| {
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386 self.traverse_fs_only(
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387 is_ignored,
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diff changeset
388 &hg_path,
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389 child_fs_entry,
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390 )
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391 })
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392 }
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393 }
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diff changeset
394 if self.options.collect_traversed_dirs {
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395 self.outcome.lock().unwrap().traversed.push(hg_path.into())
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396 }
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397 } else if file_or_symlink && self.matcher.matches(&hg_path) {
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398 self.mark_unknown_or_ignored(has_ignored_ancestor, hg_path.into())
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399 }
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400 }
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Simon Sapin <simon.sapin@octobus.net>
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401
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402 fn mark_unknown_or_ignored(
47117
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403 &self,
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diff changeset
404 has_ignored_ancestor: bool,
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diff changeset
405 hg_path: Cow<'tree, HgPath>,
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Simon Sapin <simon.sapin@octobus.net>
parents: 47112
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406 ) {
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diff changeset
407 let is_ignored = has_ignored_ancestor || (self.ignore_fn)(&hg_path);
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diff changeset
408 if is_ignored {
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parents: 47112
diff changeset
409 if self.options.list_ignored {
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diff changeset
410 self.outcome.lock().unwrap().ignored.push(hg_path)
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411 }
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Simon Sapin <simon.sapin@octobus.net>
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diff changeset
412 } else {
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parents: 47112
diff changeset
413 if self.options.list_unknown {
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diff changeset
414 self.outcome.lock().unwrap().unknown.push(hg_path)
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diff changeset
415 }
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diff changeset
416 }
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Simon Sapin <simon.sapin@octobus.net>
parents: 47112
diff changeset
417 }
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Simon Sapin <simon.sapin@octobus.net>
parents: 47112
diff changeset
418 }
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diff changeset
419
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diff changeset
420 #[cfg(unix)] // TODO
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diff changeset
421 fn mtime_seconds(metadata: &std::fs::Metadata) -> i64 {
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diff changeset
422 // Going through `Metadata::modified()` would be portable, but would take
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parents: 47112
diff changeset
423 // care to construct a `SystemTime` value with sub-second precision just
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parents: 47112
diff changeset
424 // for us to throw that away here.
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parents: 47112
diff changeset
425 use std::os::unix::fs::MetadataExt;
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diff changeset
426 metadata.mtime()
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Simon Sapin <simon.sapin@octobus.net>
parents: 47112
diff changeset
427 }
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Simon Sapin <simon.sapin@octobus.net>
parents: 47112
diff changeset
428
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diff changeset
429 struct DirEntry {
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diff changeset
430 base_name: HgPathBuf,
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diff changeset
431 full_path: PathBuf,
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parents: 47112
diff changeset
432 metadata: std::fs::Metadata,
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433 }
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diff changeset
434
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diff changeset
435 impl DirEntry {
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diff changeset
436 /// Returns **unsorted** entries in the given directory, with name and
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parents: 47112
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437 /// metadata.
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438 ///
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439 /// If a `.hg` sub-directory is encountered:
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440 ///
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Simon Sapin <simon.sapin@octobus.net>
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diff changeset
441 /// * At the repository root, ignore that sub-directory
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diff changeset
442 /// * Elsewhere, we’re listing the content of a sub-repo. Return an empty
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Simon Sapin <simon.sapin@octobus.net>
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diff changeset
443 /// list instead.
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Simon Sapin <simon.sapin@octobus.net>
parents: 47112
diff changeset
444 fn read_dir(path: &Path, is_at_repo_root: bool) -> io::Result<Vec<Self>> {
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diff changeset
445 let mut results = Vec::new();
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parents: 47112
diff changeset
446 for entry in path.read_dir()? {
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diff changeset
447 let entry = entry?;
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diff changeset
448 let metadata = entry.metadata()?;
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diff changeset
449 let name = get_bytes_from_os_string(entry.file_name());
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diff changeset
450 // FIXME don't do this when cached
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parents: 47112
diff changeset
451 if name == b".hg" {
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parents: 47112
diff changeset
452 if is_at_repo_root {
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parents: 47112
diff changeset
453 // Skip the repo’s own .hg (might be a symlink)
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parents: 47112
diff changeset
454 continue;
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Simon Sapin <simon.sapin@octobus.net>
parents: 47112
diff changeset
455 } else if metadata.is_dir() {
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parents: 47112
diff changeset
456 // A .hg sub-directory at another location means a subrepo,
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Simon Sapin <simon.sapin@octobus.net>
parents: 47112
diff changeset
457 // skip it entirely.
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diff changeset
458 return Ok(Vec::new());
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Simon Sapin <simon.sapin@octobus.net>
parents: 47112
diff changeset
459 }
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Simon Sapin <simon.sapin@octobus.net>
parents: 47112
diff changeset
460 }
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Simon Sapin <simon.sapin@octobus.net>
parents: 47112
diff changeset
461 results.push(DirEntry {
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parents: 47112
diff changeset
462 base_name: name.into(),
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parents: 47112
diff changeset
463 full_path: entry.path(),
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Simon Sapin <simon.sapin@octobus.net>
parents: 47112
diff changeset
464 metadata,
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Simon Sapin <simon.sapin@octobus.net>
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diff changeset
465 })
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Simon Sapin <simon.sapin@octobus.net>
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diff changeset
466 }
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Simon Sapin <simon.sapin@octobus.net>
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diff changeset
467 Ok(results)
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Simon Sapin <simon.sapin@octobus.net>
parents: 47112
diff changeset
468 }
be579775c2d9 dirstate-tree: Add the new `status()` algorithm
Simon Sapin <simon.sapin@octobus.net>
parents: 47112
diff changeset
469 }