D7058: rust-dirstate-status: add first Rust implementation of `dirstate.status`

Alphare (Raphaël Gomès) phabricator at mercurial-scm.org
Tue Oct 15 05:30:08 EDT 2019


Alphare updated this revision to Diff 17167.

REPOSITORY
  rHG Mercurial

CHANGES SINCE LAST UPDATE
  https://phab.mercurial-scm.org/D7058?vs=17165&id=17167

CHANGES SINCE LAST ACTION
  https://phab.mercurial-scm.org/D7058/new/

REVISION DETAIL
  https://phab.mercurial-scm.org/D7058

AFFECTED FILES
  rust/Cargo.lock
  rust/hg-core/Cargo.toml
  rust/hg-core/src/dirstate.rs
  rust/hg-core/src/dirstate/status.rs
  rust/hg-core/src/lib.rs
  rust/hg-core/src/utils/files.rs

CHANGE DETAILS

diff --git a/rust/hg-core/src/utils/files.rs b/rust/hg-core/src/utils/files.rs
--- a/rust/hg-core/src/utils/files.rs
+++ b/rust/hg-core/src/utils/files.rs
@@ -12,6 +12,7 @@
 use crate::utils::hg_path::{HgPath, HgPathBuf};
 use std::iter::FusedIterator;
 
+use std::fs::Metadata;
 use std::path::Path;
 
 pub fn get_path_from_bytes(bytes: &[u8]) -> &Path {
@@ -79,6 +80,39 @@
     path.to_ascii_lowercase()
 }
 
+#[derive(Eq, PartialEq, Ord, PartialOrd, Copy, Clone)]
+pub struct HgMetadata {
+    pub st_dev: u64,
+    pub st_mode: u32,
+    pub st_nlink: u64,
+    pub st_size: u64,
+    pub st_mtime: i64,
+    pub st_ctime: i64,
+}
+
+#[cfg(unix)]
+impl HgMetadata {
+    pub fn from_metadata(metadata: Metadata) -> Self {
+        use std::os::unix::fs::MetadataExt;
+        Self {
+            st_dev: metadata.dev(),
+            st_mode: metadata.mode(),
+            st_nlink: metadata.nlink(),
+            st_size: metadata.size(),
+            st_mtime: metadata.mtime(),
+            st_ctime: metadata.ctime(),
+        }
+    }
+}
+
+#[cfg(not(unix))]
+impl HgMetadata {
+    pub fn from_metadata(metadata: Metadata) -> Self {
+        // TODO support other platforms
+        unimplemented!()
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
diff --git a/rust/hg-core/src/lib.rs b/rust/hg-core/src/lib.rs
--- a/rust/hg-core/src/lib.rs
+++ b/rust/hg-core/src/lib.rs
@@ -12,6 +12,7 @@
     dirs_multiset::{DirsMultiset, DirsMultisetIter},
     dirstate_map::DirstateMap,
     parsers::{pack_dirstate, parse_dirstate, PARENT_SIZE},
+    status::status,
     CopyMap, CopyMapIter, DirstateEntry, DirstateParents, EntryState,
     StateMap, StateMapIter,
 };
diff --git a/rust/hg-core/src/dirstate/status.rs b/rust/hg-core/src/dirstate/status.rs
new file mode 100644
--- /dev/null
+++ b/rust/hg-core/src/dirstate/status.rs
@@ -0,0 +1,251 @@
+// status.rs
+//
+// Copyright 2019 Raphaël Gomès <rgomes at octobus.net>
+//
+// This software may be used and distributed according to the terms of the
+// GNU General Public License version 2 or any later version.
+
+//! Rust implementation of dirstate.status (dirstate.py).
+//! It is currently missing a lot of functionality compared to the Python one
+//! and will only be triggered in narrow cases.
+
+use crate::utils::files::HgMetadata;
+use crate::utils::hg_path::{hg_path_to_path_buf, HgPathBuf};
+use crate::{DirstateEntry, DirstateMap, EntryState};
+use rayon::prelude::*;
+use std::collections::HashMap;
+use std::fs::Metadata;
+use std::path::Path;
+
+/// Get stat data about the files explicitly specified by match.
+/// TODO subrepos
+fn walk_explicit(
+    files: Vec<HgPathBuf>,
+    dmap: &mut DirstateMap,
+    root_dir: impl AsRef<Path> + Sync,
+) -> std::io::Result<HashMap<HgPathBuf, Option<HgMetadata>>> {
+    let mut results = HashMap::new();
+
+    // A tuple of the normalized filename and the `Result` of the call to
+    // `symlink_metadata` for separate handling.
+    type WalkTuple<'a> = (&'a HgPathBuf, std::io::Result<Metadata>);
+
+    let stats_res: std::io::Result<Vec<WalkTuple>> = files
+        .par_iter()
+        .map(|filename| {
+            // TODO normalization
+            let normalized = filename;
+
+            let target_filename =
+                root_dir.as_ref().join(hg_path_to_path_buf(normalized)?);
+
+            Ok((normalized, target_filename.symlink_metadata()))
+        })
+        .collect();
+
+    for res in stats_res? {
+        match res {
+            (normalized, Ok(stat)) => {
+                if stat.is_file() {
+                    results.insert(
+                        normalized.to_owned(),
+                        Some(HgMetadata::from_metadata(stat)),
+                    );
+                } else {
+                    if dmap.contains_key(normalized) {
+                        results.insert(normalized.to_owned(), None);
+                    }
+                }
+            }
+            (normalized, Err(_)) => {
+                if dmap.contains_key(normalized) {
+                    results.insert(normalized.to_owned(), None);
+                }
+            }
+        };
+    }
+
+    Ok(results)
+}
+
+// Stat all entries in the `DirstateMap` and return their new metadata.
+pub fn stat_dmap_entries(
+    dmap: &DirstateMap,
+    results: &HashMap<HgPathBuf, Option<HgMetadata>>,
+    root_dir: impl AsRef<Path> + Sync,
+) -> std::io::Result<Vec<(HgPathBuf, Option<HgMetadata>)>> {
+    dmap.par_iter()
+        .filter_map(
+            // Getting file metadata is costly, so we don't do it if the
+            // file is already present in the results, hence `filter_map`
+            |(filename, _)| -> Option<
+                std::io::Result<(HgPathBuf, Option<HgMetadata>)>
+            > {
+                if results.contains_key(filename) {
+                    return None;
+                }
+                let meta = match hg_path_to_path_buf(filename) {
+                    Ok(p) => root_dir.as_ref().join(p).symlink_metadata(),
+                    Err(e) => return Some(Err(e.into())),
+                };
+
+                Some(match meta {
+                    Ok(ref m)
+                        if !(m.file_type().is_file()
+                            || m.file_type().is_symlink()) =>
+                    {
+                        Ok((filename.to_owned(), None))
+                    }
+                    Ok(m) => Ok((
+                        filename.to_owned(),
+                        Some(HgMetadata::from_metadata(m)),
+                    )),
+                    Err(ref e)
+                        if e.kind() == std::io::ErrorKind::NotFound
+                            || e.raw_os_error() == Some(20) =>
+                    {
+                        // Rust does not yet have an `ErrorKind` for
+                        // `NotADirectory` (errno 20)
+                        Ok((filename.to_owned(), None))
+                    }
+                    Err(e) => Err(e),
+                })
+            },
+        )
+        .collect()
+}
+
+pub struct StatusResult {
+    pub modified: Vec<HgPathBuf>,
+    pub added: Vec<HgPathBuf>,
+    pub removed: Vec<HgPathBuf>,
+    pub deleted: Vec<HgPathBuf>,
+    pub clean: Vec<HgPathBuf>,
+    // TODO ignored
+    // TODO unknown
+}
+
+fn build_response(
+    dmap: &DirstateMap,
+    list_clean: bool,
+    last_normal_time: i64,
+    check_exec: bool,
+    results: HashMap<HgPathBuf, Option<HgMetadata>>,
+) -> ((Vec<HgPathBuf>, StatusResult)) {
+    let mut lookup = vec![];
+    let mut modified = vec![];
+    let mut added = vec![];
+    let mut removed = vec![];
+    let mut deleted = vec![];
+    let mut clean = vec![];
+
+    for (filename, metadata_option) in results.into_iter() {
+        let DirstateEntry {
+            state,
+            mode,
+            mtime,
+            size,
+        } = match dmap.get(&filename) {
+            None => {
+                continue;
+            }
+            Some(e) => *e,
+        };
+
+        match metadata_option {
+            None if match state {
+                EntryState::Normal
+                | EntryState::Merged
+                | EntryState::Added => true,
+                _ => false,
+            } =>
+            {
+                deleted.push(filename);
+            }
+            None => match state {
+                EntryState::Removed => removed.push(filename),
+                _ => {}
+            },
+            Some(HgMetadata {
+                st_mode,
+                st_size,
+                st_mtime,
+                ..
+            }) => {
+                match state {
+                    EntryState::Normal => {
+                        // Dates and times that are outside the 31-bit signed
+                        // range are compared modulo 2^31. This should prevent
+                        // it from behaving badly with very large files or
+                        // corrupt dates while still having a high probability
+                        // of detecting changes. (issue2608)
+                        let range_mask = 0x7fffffff;
+
+                        let size_changed = (size != st_size as i32)
+                            && size != (st_size as i32 & range_mask);
+                        let mode_changed = (mode ^ st_mode as i32) & 0o100
+                            != 0o000
+                            && check_exec;
+                        if size >= 0
+                            && (size_changed || mode_changed)
+                            || size == -2  // other parent
+                            || dmap.copy_map.contains_key(&filename)
+                        {
+                            modified.push(filename);
+                        } else if mtime != st_mtime as i32
+                            && mtime != (st_mtime as i32 & range_mask)
+                        {
+                            lookup.push(filename);
+                        } else if st_mtime == last_normal_time {
+                            // the file may have just been marked as normal and
+                            // it may have changed in the same second without
+                            // changing its size. This can happen if we quickly
+                            // do multiple commits. Force lookup, so we don't
+                            // miss such a racy file change.
+                            lookup.push(filename);
+                        } else if list_clean {
+                            clean.push(filename);
+                        }
+                    }
+                    EntryState::Merged => modified.push(filename),
+                    EntryState::Added => added.push(filename),
+                    EntryState::Removed => removed.push(filename),
+                    EntryState::Unknown => {}
+                }
+            }
+        }
+    }
+
+    (
+        lookup,
+        StatusResult {
+            modified,
+            added,
+            removed,
+            deleted,
+            clean,
+        },
+    )
+}
+
+pub fn status(
+    mut dmap: &mut DirstateMap,
+    root_dir: impl AsRef<Path> + Sync,
+    files: Vec<HgPathBuf>,
+    list_clean: bool,
+    last_normal_time: i64,
+    check_exec: bool,
+) -> std::io::Result<(Vec<HgPathBuf>, StatusResult)> {
+    let mut results =
+        walk_explicit(files, &mut dmap, root_dir.as_ref().to_owned())?;
+
+    results.extend(stat_dmap_entries(&dmap, &results, root_dir)?);
+
+    Ok(build_response(
+        &dmap,
+        list_clean,
+        last_normal_time,
+        check_exec,
+        results,
+    ))
+}
diff --git a/rust/hg-core/src/dirstate.rs b/rust/hg-core/src/dirstate.rs
--- a/rust/hg-core/src/dirstate.rs
+++ b/rust/hg-core/src/dirstate.rs
@@ -13,6 +13,7 @@
 pub mod dirs_multiset;
 pub mod dirstate_map;
 pub mod parsers;
+pub mod status;
 
 #[derive(Debug, PartialEq, Clone)]
 pub struct DirstateParents {
diff --git a/rust/hg-core/Cargo.toml b/rust/hg-core/Cargo.toml
--- a/rust/hg-core/Cargo.toml
+++ b/rust/hg-core/Cargo.toml
@@ -15,3 +15,4 @@
 rand = "> 0.6.4"
 rand_pcg = "> 0.1.0"
 regex = "^1.1"
+rayon = "1.2.0"
diff --git a/rust/Cargo.lock b/rust/Cargo.lock
--- a/rust/Cargo.lock
+++ b/rust/Cargo.lock
@@ -2,61 +2,120 @@
 # It is not intended for manual editing.
 [[package]]
 name = "aho-corasick"
-version = "0.6.9"
+version = "0.7.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "memchr 2.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "memchr 2.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "arrayvec"
+version = "0.4.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "nodrop 0.1.14 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "autocfg"
-version = "0.1.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
-[[package]]
-name = "bitflags"
-version = "1.0.4"
+version = "0.1.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "byteorder"
-version = "1.3.1"
+version = "1.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
-name = "cloudabi"
-version = "0.0.3"
+name = "c2-chacha"
+version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ppv-lite86 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
+name = "cfg-if"
+version = "0.1.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
 name = "cpython"
 version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
- "num-traits 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.62 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num-traits 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "python27-sys 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "python3-sys 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
-name = "fuchsia-cprng"
-version = "0.1.0"
+name = "crossbeam-deque"
+version = "0.7.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "crossbeam-epoch 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-utils 0.6.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "crossbeam-epoch"
+version = "0.7.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "arrayvec 0.4.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-utils 0.6.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "memoffset 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "scopeguard 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "crossbeam-queue"
+version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "crossbeam-utils 0.6.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "crossbeam-utils"
+version = "0.6.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "either"
+version = "1.5.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "getrandom"
+version = "0.1.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.62 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wasi 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
 
 [[package]]
 name = "hg-core"
 version = "0.1.0"
 dependencies = [
- "byteorder 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "memchr 2.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand_pcg 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "regex 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "byteorder 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "memchr 2.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_pcg 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rayon 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -65,7 +124,7 @@
 dependencies = [
  "cpython 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "hg-core 0.1.0",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.62 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -73,27 +132,56 @@
 version = "0.1.0"
 dependencies = [
  "hg-core 0.1.0",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.62 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "lazy_static"
-version = "1.3.0"
+version = "1.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "libc"
-version = "0.2.45"
+version = "0.2.62"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "memchr"
-version = "2.2.0"
+version = "2.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "memoffset"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "nodrop"
+version = "0.1.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "num-traits"
-version = "0.2.6"
+version = "0.2.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "autocfg 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "num_cpus"
+version = "1.10.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "libc 0.2.62 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "ppv-lite86"
+version = "0.2.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -101,8 +189,8 @@
 version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
- "regex 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.62 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -110,133 +198,93 @@
 version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
- "regex 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.62 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "rand"
-version = "0.6.5"
+version = "0.7.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "autocfg 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand_chacha 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand_core 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand_hc 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand_isaac 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand_jitter 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand_os 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand_pcg 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand_xorshift 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "getrandom 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.62 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_chacha 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_core 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_hc 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "rand_chacha"
-version = "0.1.1"
+version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
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@@ -247,6 +295,11 @@
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