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rust-dirstate-status: add first Rust implementation of `dirstate.status`...
Raphaël Gomès -
r43565:99394e6c default
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1 // status.rs
2 //
3 // Copyright 2019 Raphaël Gomès <rgomes@octobus.net>
4 //
5 // This software may be used and distributed according to the terms of the
6 // GNU General Public License version 2 or any later version.
7
8 //! Rust implementation of dirstate.status (dirstate.py).
9 //! It is currently missing a lot of functionality compared to the Python one
10 //! and will only be triggered in narrow cases.
11
12 use crate::utils::files::HgMetadata;
13 use crate::utils::hg_path::{hg_path_to_path_buf, HgPath, HgPathBuf};
14 use crate::{DirstateEntry, DirstateMap, EntryState};
15 use rayon::prelude::*;
16 use std::collections::HashMap;
17 use std::fs::Metadata;
18 use std::path::Path;
19
20 /// Get stat data about the files explicitly specified by match.
21 /// TODO subrepos
22 fn walk_explicit(
23 files: &[impl AsRef<HgPath> + Sync],
24 dmap: &DirstateMap,
25 root_dir: impl AsRef<Path> + Sync,
26 ) -> std::io::Result<HashMap<HgPathBuf, Option<HgMetadata>>> {
27 let mut results = HashMap::new();
28
29 // A tuple of the normalized filename and the `Result` of the call to
30 // `symlink_metadata` for separate handling.
31 type WalkTuple<'a> = (&'a HgPath, std::io::Result<Metadata>);
32
33 let stats_res: std::io::Result<Vec<WalkTuple>> = files
34 .par_iter()
35 .map(|filename| {
36 // TODO normalization
37 let normalized = filename.as_ref();
38
39 let target_filename =
40 root_dir.as_ref().join(hg_path_to_path_buf(normalized)?);
41
42 Ok((normalized, target_filename.symlink_metadata()))
43 })
44 .collect();
45
46 for res in stats_res? {
47 match res {
48 (normalized, Ok(stat)) => {
49 if stat.is_file() {
50 results.insert(
51 normalized.to_owned(),
52 Some(HgMetadata::from_metadata(stat)),
53 );
54 } else {
55 if dmap.contains_key(normalized) {
56 results.insert(normalized.to_owned(), None);
57 }
58 }
59 }
60 (normalized, Err(_)) => {
61 if dmap.contains_key(normalized) {
62 results.insert(normalized.to_owned(), None);
63 }
64 }
65 };
66 }
67
68 Ok(results)
69 }
70
71 // Stat all entries in the `DirstateMap` and return their new metadata.
72 pub fn stat_dmap_entries(
73 dmap: &DirstateMap,
74 results: &HashMap<HgPathBuf, Option<HgMetadata>>,
75 root_dir: impl AsRef<Path> + Sync,
76 ) -> std::io::Result<Vec<(HgPathBuf, Option<HgMetadata>)>> {
77 dmap.par_iter()
78 .filter_map(
79 // Getting file metadata is costly, so we don't do it if the
80 // file is already present in the results, hence `filter_map`
81 |(filename, _)| -> Option<
82 std::io::Result<(HgPathBuf, Option<HgMetadata>)>
83 > {
84 if results.contains_key(filename) {
85 return None;
86 }
87 let meta = match hg_path_to_path_buf(filename) {
88 Ok(p) => root_dir.as_ref().join(p).symlink_metadata(),
89 Err(e) => return Some(Err(e.into())),
90 };
91
92 Some(match meta {
93 Ok(ref m)
94 if !(m.file_type().is_file()
95 || m.file_type().is_symlink()) =>
96 {
97 Ok((filename.to_owned(), None))
98 }
99 Ok(m) => Ok((
100 filename.to_owned(),
101 Some(HgMetadata::from_metadata(m)),
102 )),
103 Err(ref e)
104 if e.kind() == std::io::ErrorKind::NotFound
105 || e.raw_os_error() == Some(20) =>
106 {
107 // Rust does not yet have an `ErrorKind` for
108 // `NotADirectory` (errno 20)
109 // It happens if the dirstate contains `foo/bar` and
110 // foo is not a directory
111 Ok((filename.to_owned(), None))
112 }
113 Err(e) => Err(e),
114 })
115 },
116 )
117 .collect()
118 }
119
120 pub struct StatusResult {
121 pub modified: Vec<HgPathBuf>,
122 pub added: Vec<HgPathBuf>,
123 pub removed: Vec<HgPathBuf>,
124 pub deleted: Vec<HgPathBuf>,
125 pub clean: Vec<HgPathBuf>,
126 // TODO ignored
127 // TODO unknown
128 }
129
130 fn build_response(
131 dmap: &DirstateMap,
132 list_clean: bool,
133 last_normal_time: i64,
134 check_exec: bool,
135 results: HashMap<HgPathBuf, Option<HgMetadata>>,
136 ) -> (Vec<HgPathBuf>, StatusResult) {
137 let mut lookup = vec![];
138 let mut modified = vec![];
139 let mut added = vec![];
140 let mut removed = vec![];
141 let mut deleted = vec![];
142 let mut clean = vec![];
143
144 for (filename, metadata_option) in results.into_iter() {
145 let DirstateEntry {
146 state,
147 mode,
148 mtime,
149 size,
150 } = match dmap.get(&filename) {
151 None => {
152 continue;
153 }
154 Some(e) => *e,
155 };
156
157 match metadata_option {
158 None => {
159 match state {
160 EntryState::Normal
161 | EntryState::Merged
162 | EntryState::Added => deleted.push(filename),
163 EntryState::Removed => removed.push(filename),
164 _ => {}
165 };
166 }
167 Some(HgMetadata {
168 st_mode,
169 st_size,
170 st_mtime,
171 ..
172 }) => {
173 match state {
174 EntryState::Normal => {
175 // Dates and times that are outside the 31-bit signed
176 // range are compared modulo 2^31. This should prevent
177 // it from behaving badly with very large files or
178 // corrupt dates while still having a high probability
179 // of detecting changes. (issue2608)
180 let range_mask = 0x7fffffff;
181
182 let size_changed = (size != st_size as i32)
183 && size != (st_size as i32 & range_mask);
184 let mode_changed = (mode ^ st_mode as i32) & 0o100
185 != 0o000
186 && check_exec;
187 if size >= 0
188 && (size_changed || mode_changed)
189 || size == -2 // other parent
190 || dmap.copy_map.contains_key(&filename)
191 {
192 modified.push(filename);
193 } else if mtime != st_mtime as i32
194 && mtime != (st_mtime as i32 & range_mask)
195 {
196 lookup.push(filename);
197 } else if st_mtime == last_normal_time {
198 // the file may have just been marked as normal and
199 // it may have changed in the same second without
200 // changing its size. This can happen if we quickly
201 // do multiple commits. Force lookup, so we don't
202 // miss such a racy file change.
203 lookup.push(filename);
204 } else if list_clean {
205 clean.push(filename);
206 }
207 }
208 EntryState::Merged => modified.push(filename),
209 EntryState::Added => added.push(filename),
210 EntryState::Removed => removed.push(filename),
211 EntryState::Unknown => {}
212 }
213 }
214 }
215 }
216
217 (
218 lookup,
219 StatusResult {
220 modified,
221 added,
222 removed,
223 deleted,
224 clean,
225 },
226 )
227 }
228
229 pub fn status(
230 dmap: &DirstateMap,
231 root_dir: impl AsRef<Path> + Sync + Copy,
232 files: &[impl AsRef<HgPath> + Sync],
233 list_clean: bool,
234 last_normal_time: i64,
235 check_exec: bool,
236 ) -> std::io::Result<(Vec<HgPathBuf>, StatusResult)> {
237 let mut results = walk_explicit(files, &dmap, root_dir)?;
238
239 results.extend(stat_dmap_entries(&dmap, &results, root_dir)?);
240
241 Ok(build_response(
242 &dmap,
243 list_clean,
244 last_normal_time,
245 check_exec,
246 results,
247 ))
248 }
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@@ -15,3 +15,4 b' memchr = "2.2.0"'
15 rand = "0.6.5"
15 rand = "0.6.5"
16 rand_pcg = "0.1.1"
16 rand_pcg = "0.1.1"
17 regex = "1.1.0"
17 regex = "1.1.0"
18 rayon = "1.2.0"
@@ -13,6 +13,7 b' use std::convert::TryFrom;'
13 pub mod dirs_multiset;
13 pub mod dirs_multiset;
14 pub mod dirstate_map;
14 pub mod dirstate_map;
15 pub mod parsers;
15 pub mod parsers;
16 pub mod status;
16
17
17 #[derive(Debug, PartialEq, Clone)]
18 #[derive(Debug, PartialEq, Clone)]
18 pub struct DirstateParents {
19 pub struct DirstateParents {
@@ -12,6 +12,7 b' pub use dirstate::{'
12 dirs_multiset::{DirsMultiset, DirsMultisetIter},
12 dirs_multiset::{DirsMultiset, DirsMultisetIter},
13 dirstate_map::DirstateMap,
13 dirstate_map::DirstateMap,
14 parsers::{pack_dirstate, parse_dirstate, PARENT_SIZE},
14 parsers::{pack_dirstate, parse_dirstate, PARENT_SIZE},
15 status::status,
15 CopyMap, CopyMapIter, DirstateEntry, DirstateParents, EntryState,
16 CopyMap, CopyMapIter, DirstateEntry, DirstateParents, EntryState,
16 StateMap, StateMapIter,
17 StateMap, StateMapIter,
17 };
18 };
@@ -12,6 +12,7 b''
12 use crate::utils::hg_path::{HgPath, HgPathBuf};
12 use crate::utils::hg_path::{HgPath, HgPathBuf};
13 use std::iter::FusedIterator;
13 use std::iter::FusedIterator;
14
14
15 use std::fs::Metadata;
15 use std::path::Path;
16 use std::path::Path;
16
17
17 pub fn get_path_from_bytes(bytes: &[u8]) -> &Path {
18 pub fn get_path_from_bytes(bytes: &[u8]) -> &Path {
@@ -76,6 +77,32 b' pub fn normalize_case(path: &HgPath) -> '
76 path.to_ascii_lowercase()
77 path.to_ascii_lowercase()
77 }
78 }
78
79
80 #[derive(Eq, PartialEq, Ord, PartialOrd, Copy, Clone)]
81 pub struct HgMetadata {
82 pub st_dev: u64,
83 pub st_mode: u32,
84 pub st_nlink: u64,
85 pub st_size: u64,
86 pub st_mtime: i64,
87 pub st_ctime: i64,
88 }
89
90 // TODO support other plaforms
91 #[cfg(unix)]
92 impl HgMetadata {
93 pub fn from_metadata(metadata: Metadata) -> Self {
94 use std::os::unix::fs::MetadataExt;
95 Self {
96 st_dev: metadata.dev(),
97 st_mode: metadata.mode(),
98 st_nlink: metadata.nlink(),
99 st_size: metadata.size(),
100 st_mtime: metadata.mtime(),
101 st_ctime: metadata.ctime(),
102 }
103 }
104 }
105
79 #[cfg(test)]
106 #[cfg(test)]
80 mod tests {
107 mod tests {
81 use super::*;
108 use super::*;
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