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Compute git statuses using the bundled git executable, not libgit2 (#12444)

Browse Source 
I realized that somehow, the `git` executable is able to compute `git
status` much more quickly than libgit2, so I've switched our git status
logic to use `git`. Follow-up to
https://github.com/zed-industries/zed/pull/12266.

Release Notes:

- Improved the performance of git status updated when working in large
git repositories.
This commit is contained in:
Max Brunsfeld 2024-05-29 14:31:24 -07:00 committed by GitHub
parent 6294a3b80b
commit dd328efaa7
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194
5 changed files with 222 additions and 249 deletions
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9
crates/git/src/blame.rs
View File

@ -8,15 +8,11 @@ use std::process::{Command, Stdio};
use std::sync::Arc;
use std::{ops::Range, path::Path};
use text::Rope;
use time;
use time::macros::format_description;
use time::OffsetDateTime;
use time::UtcOffset;
use url::Url;
#[cfg(windows)]
use std::os::windows::process::CommandExt;
pub use git2 as libgit;
#[derive(Debug, Clone, Default)]
@ -98,7 +94,10 @@ fn run_git_blame(
.stderr(Stdio::piped());
#[cfg(windows)]
child.creation_flags(windows::Win32::System::Threading::CREATE_NO_WINDOW.0);
{
use std::os::windows::process::CommandExt;
child.creation_flags(windows::Win32::System::Threading::CREATE_NO_WINDOW.0);
}
let child = child
.spawn()

1
crates/git/src/git.rs
View File

@ -15,6 +15,7 @@ pub mod blame;
pub mod commit;
pub mod diff;
pub mod repository;
pub mod status;
lazy_static! {
pub static ref DOT_GIT: &'static OsStr = OsStr::new(".git");

160
crates/git/src/repository.rs
View File

@ -1,8 +1,8 @@
use crate::blame::Blame;
use crate::GitHostingProviderRegistry;
use crate::{blame::Blame, status::GitStatus};
use anyhow::{Context, Result};
use collections::HashMap;
use git2::{BranchType, StatusShow};
use git2::BranchType;
use parking_lot::Mutex;
use rope::Rope;
use serde::{Deserialize, Serialize};
@ -10,10 +10,9 @@ use std::{
cmp::Ordering,
path::{Component, Path, PathBuf},
sync::Arc,
time::SystemTime,
};
use sum_tree::{MapSeekTarget, TreeMap};
use util::{paths::PathExt, ResultExt};
use sum_tree::MapSeekTarget;
use util::ResultExt;
pub use git2::Repository as LibGitRepository;
@ -39,23 +38,11 @@ pub trait GitRepository: Send {
/// Returns the SHA of the current HEAD.
fn head_sha(&self) -> Option<String>;
/// Get the statuses of all of the files in the index that start with the given
/// path and have changes with respect to the HEAD commit. This is fast because
/// the index stores hashes of trees, so that unchanged directories can be skipped.
fn staged_statuses(&self, path_prefix: &Path) -> TreeMap<RepoPath, GitFileStatus>;
fn statuses(&self, path_prefix: &Path) -> Result<GitStatus>;
/// Get the status of a given file in the working directory with respect to
/// the index. In the common case, when there are no changes, this only requires
/// an index lookup. The index stores the mtime of each file when it was added,
/// so there's no work to do if the mtime matches.
fn unstaged_status(&self, path: &RepoPath, mtime: SystemTime) -> Option<GitFileStatus>;
/// Get the status of a given file in the working directory with respect to
/// the HEAD commit. In the common case, when there are no changes, this only
/// requires an index lookup and blob comparison between the index and the HEAD
/// commit. The index stores the mtime of each file when it was added, so there's
/// no need to consider the working directory file if the mtime matches.
fn status(&self, path: &RepoPath, mtime: SystemTime) -> Option<GitFileStatus>;
fn status(&self, path: &Path) -> Option<GitFileStatus> {
Some(self.statuses(path).ok()?.entries.first()?.1)
}
fn branches(&self) -> Result<Vec<Branch>>;
fn change_branch(&self, _: &str) -> Result<()>;
@ -137,65 +124,12 @@ impl GitRepository for RealGitRepository {
head.target().map(|oid| oid.to_string())
}
fn staged_statuses(&self, path_prefix: &Path) -> TreeMap<RepoPath, GitFileStatus> {
let mut map = TreeMap::default();
let mut options = git2::StatusOptions::new();
options.pathspec(path_prefix);
options.show(StatusShow::Index);
if let Some(statuses) = self.repository.statuses(Some(&mut options)).log_err() {
for status in statuses.iter() {
let path = RepoPath(PathBuf::try_from_bytes(status.path_bytes()).unwrap());
let status = status.status();
if !status.contains(git2::Status::IGNORED) {
if let Some(status) = read_status(status) {
map.insert(path, status)
}
}
}
}
map
}
fn unstaged_status(&self, path: &RepoPath, mtime: SystemTime) -> Option<GitFileStatus> {
// If the file has not changed since it was added to the index, then
// there can't be any changes.
if matches_index(&self.repository, path, mtime) {
return None;
}
let mut options = git2::StatusOptions::new();
options.pathspec(&path.0);
options.disable_pathspec_match(true);
options.include_untracked(true);
options.recurse_untracked_dirs(true);
options.include_unmodified(true);
options.show(StatusShow::Workdir);
let statuses = self.repository.statuses(Some(&mut options)).log_err()?;
let status = statuses.get(0).and_then(|s| read_status(s.status()));
status
}
fn status(&self, path: &RepoPath, mtime: SystemTime) -> Option<GitFileStatus> {
let mut options = git2::StatusOptions::new();
options.pathspec(&path.0);
options.disable_pathspec_match(true);
options.include_untracked(true);
options.recurse_untracked_dirs(true);
options.include_unmodified(true);
// If the file has not changed since it was added to the index, then
// there's no need to examine the working directory file: just compare
// the blob in the index to the one in the HEAD commit.
if matches_index(&self.repository, path, mtime) {
options.show(StatusShow::Index);
}
let statuses = self.repository.statuses(Some(&mut options)).log_err()?;
let status = statuses.get(0).and_then(|s| read_status(s.status()));
status
fn statuses(&self, path_prefix: &Path) -> Result<GitStatus> {
let working_directory = self
.repository
.workdir()
.context("failed to read git work directory")?;
GitStatus::new(&self.git_binary_path, working_directory, path_prefix)
}
fn branches(&self) -> Result<Vec<Branch>> {
@ -222,6 +156,7 @@ impl GitRepository for RealGitRepository {
.collect();
Ok(valid_branches)
}
fn change_branch(&self, name: &str) -> Result<()> {
let revision = self.repository.find_branch(name, BranchType::Local)?;
let revision = revision.get();
@ -261,38 +196,6 @@ impl GitRepository for RealGitRepository {
}
}
fn matches_index(repo: &LibGitRepository, path: &RepoPath, mtime: SystemTime) -> bool {
if let Some(index) = repo.index().log_err() {
if let Some(entry) = index.get_path(path, 0) {
if let Some(mtime) = mtime.duration_since(SystemTime::UNIX_EPOCH).log_err() {
if entry.mtime.seconds() == mtime.as_secs() as i32
&& entry.mtime.nanoseconds() == mtime.subsec_nanos()
{
return true;
}
}
}
}
false
}
fn read_status(status: git2::Status) -> Option<GitFileStatus> {
if status.contains(git2::Status::CONFLICTED) {
Some(GitFileStatus::Conflict)
} else if status.intersects(
git2::Status::WT_MODIFIED
| git2::Status::WT_RENAMED
| git2::Status::INDEX_MODIFIED
| git2::Status::INDEX_RENAMED,
) {
Some(GitFileStatus::Modified)
} else if status.intersects(git2::Status::WT_NEW | git2::Status::INDEX_NEW) {
Some(GitFileStatus::Added)
} else {
None
}
}
#[derive(Debug, Clone, Default)]
pub struct FakeGitRepository {
state: Arc<Mutex<FakeGitRepositoryState>>,
@ -333,24 +236,23 @@ impl GitRepository for FakeGitRepository {
None
}
fn staged_statuses(&self, path_prefix: &Path) -> TreeMap<RepoPath, GitFileStatus> {
let mut map = TreeMap::default();
fn statuses(&self, path_prefix: &Path) -> Result<GitStatus> {
let state = self.state.lock();
for (repo_path, status) in state.worktree_statuses.iter() {
if repo_path.0.starts_with(path_prefix) {
map.insert(repo_path.to_owned(), status.to_owned());
}
}
map
}
fn unstaged_status(&self, _path: &RepoPath, _mtime: SystemTime) -> Option<GitFileStatus> {
None
}
fn status(&self, path: &RepoPath, _mtime: SystemTime) -> Option<GitFileStatus> {
let state = self.state.lock();
state.worktree_statuses.get(path).cloned()
let mut entries = state
.worktree_statuses
.iter()
.filter_map(|(repo_path, status)| {
if repo_path.0.starts_with(path_prefix) {
Some((repo_path.to_owned(), *status))
} else {
None
}
})
.collect::<Vec<_>>();
entries.sort_unstable_by(|a, b| a.0.cmp(&b.0));
Ok(GitStatus {
entries: entries.into(),
})
}
fn branches(&self) -> Result<Vec<Branch>> {

99
crates/git/src/status.rs Normal file
View File

@ -0,0 +1,99 @@
use crate::repository::{GitFileStatus, RepoPath};
use anyhow::{anyhow, Result};
use std::{
path::{Path, PathBuf},
process::{Command, Stdio},
sync::Arc,
};
#[derive(Clone)]
pub struct GitStatus {
pub entries: Arc<[(RepoPath, GitFileStatus)]>,
}
impl GitStatus {
pub(crate) fn new(
git_binary: &Path,
working_directory: &Path,
mut path_prefix: &Path,
) -> Result<Self> {
let mut child = Command::new(git_binary);
if path_prefix == Path::new("") {
path_prefix = Path::new(".");
}
child
.current_dir(working_directory)
.args([
"--no-optional-locks",
"status",
"--porcelain=v1",
"--untracked-files=all",
"-z",
])
.arg(path_prefix)
.stdin(Stdio::null())
.stdout(Stdio::piped())
.stderr(Stdio::piped());
#[cfg(windows)]
{
use std::os::windows::process::CommandExt;
child.creation_flags(windows::Win32::System::Threading::CREATE_NO_WINDOW.0);
}
let child = child
.spawn()
.map_err(|e| anyhow!("Failed to start git status process: {}", e))?;
let output = child
.wait_with_output()
.map_err(|e| anyhow!("Failed to read git blame output: {}", e))?;
if !output.status.success() {
let stderr = String::from_utf8_lossy(&output.stderr);
return Err(anyhow!("git status process failed: {}", stderr));
}
let stdout = String::from_utf8_lossy(&output.stdout);
let mut entries = stdout
.split('\0')
.filter_map(|entry| {
if entry.is_char_boundary(3) {
let (status, path) = entry.split_at(3);
let status = status.trim();
Some((
RepoPath(PathBuf::from(path)),
match status {
"A" | "??" => GitFileStatus::Added,
"M" => GitFileStatus::Modified,
_ => return None,
},
))
} else {
None
}
})
.collect::<Vec<_>>();
entries.sort_unstable_by(|a, b| a.0.cmp(&b.0));
Ok(Self {
entries: entries.into(),
})
}
pub fn get(&self, path: &Path) -> Option<GitFileStatus> {
self.entries
.binary_search_by(|(repo_path, _)| repo_path.0.as_path().cmp(path))
.ok()
.map(|index| self.entries[index].1)
}
}
impl Default for GitStatus {
fn default() -> Self {
Self {
entries: Arc::new([]),
}
}
}

202
crates/worktree/src/worktree.rs
View File

@ -21,6 +21,7 @@ use futures::{
FutureExt as _, Stream, StreamExt,
};
use fuzzy::CharBag;
use git::status::GitStatus;
use git::{
repository::{GitFileStatus, GitRepository, RepoPath},
DOT_GIT, GITIGNORE,
@ -77,7 +78,7 @@ pub const FS_WATCH_LATENCY: Duration = Duration::from_millis(100);
#[cfg(not(feature = "test-support"))]
pub const FS_WATCH_LATENCY: Duration = Duration::from_millis(100);
const GIT_STATUS_UPDATE_BATCH_SIZE: usize = 100;
const GIT_STATUS_UPDATE_BATCH_SIZE: usize = 1024;
#[derive(Copy, Clone, PartialEq, Eq, Debug, Hash, PartialOrd, Ord)]
pub struct WorktreeId(usize);
@ -2019,18 +2020,13 @@ impl Snapshot {
include_ignored: bool,
path: &Path,
) -> Traversal {
let mut cursor = self.entries_by_path.cursor();
cursor.seek(&TraversalTarget::Path(path), Bias::Left, &());
let mut traversal = Traversal {
cursor,
Traversal::new(
&self.entries_by_path,
include_files,
include_dirs,
include_ignored,
};
if traversal.end_offset() == traversal.start_offset() {
traversal.next();
}
traversal
path,
)
}
pub fn files(&self, include_ignored: bool, start: usize) -> Traversal {
@ -2558,8 +2554,12 @@ impl BackgroundScannerState {
if let Ok(repo_path) = repo_entry.relativize(&self.snapshot, &path) {
containing_repository = Some(ScanJobContainingRepository {
work_directory: workdir_path,
repository: repo.repo_ptr.clone(),
staged_statuses: repo.repo_ptr.lock().staged_statuses(&repo_path),
statuses: repo
.repo_ptr
.lock()
.statuses(&repo_path)
.log_err()
.unwrap_or_default(),
});
}
}
@ -3832,11 +3832,14 @@ impl BackgroundScanner {
.lock()
.build_git_repository(child_path.clone(), self.fs.as_ref())
{
let staged_statuses = repository.lock().staged_statuses(Path::new(""));
let statuses = repository
.lock()
.statuses(Path::new(""))
.log_err()
.unwrap_or_default();
containing_repository = Some(ScanJobContainingRepository {
work_directory,
repository,
staged_statuses,
statuses,
});
}
} else if child_name == *GITIGNORE {
@ -3946,13 +3949,8 @@ impl BackgroundScanner {
if !child_entry.is_ignored {
if let Some(repo) = &containing_repository {
if let Ok(repo_path) = child_entry.path.strip_prefix(&repo.work_directory) {
if let Some(mtime) = child_entry.mtime {
let repo_path = RepoPath(repo_path.into());
child_entry.git_status = combine_git_statuses(
repo.staged_statuses.get(&repo_path).copied(),
repo.repository.lock().unstaged_status(&repo_path, mtime),
);
}
let repo_path = RepoPath(repo_path.into());
child_entry.git_status = repo.statuses.get(&repo_path);
}
}
}
@ -4079,10 +4077,7 @@ impl BackgroundScanner {
if !is_dir && !fs_entry.is_ignored && !fs_entry.is_external {
if let Some((repo_entry, repo)) = state.snapshot.repo_for_path(path) {
if let Ok(repo_path) = repo_entry.relativize(&state.snapshot, path) {
if let Some(mtime) = fs_entry.mtime {
let repo = repo.repo_ptr.lock();
fs_entry.git_status = repo.status(&repo_path, mtime);
}
fs_entry.git_status = repo.repo_ptr.lock().status(&repo_path);
}
}
}
@ -4267,11 +4262,8 @@ impl BackgroundScanner {
path_entry.is_ignored = entry.is_ignored;
if !entry.is_dir() && !entry.is_ignored && !entry.is_external {
if let Some((ref repo_entry, local_repo)) = repo {
if let Some(mtime) = &entry.mtime {
if let Ok(repo_path) = repo_entry.relativize(&snapshot, &entry.path) {
let repo = local_repo.repo_ptr.lock();
entry.git_status = repo.status(&repo_path, *mtime);
}
if let Ok(repo_path) = repo_entry.relativize(&snapshot, &entry.path) {
entry.git_status = local_repo.repo_ptr.lock().status(&repo_path);
}
}
}
@ -4351,7 +4343,17 @@ impl BackgroundScanner {
}
};
let staged_statuses = repository.lock().staged_statuses(Path::new(""));
let statuses = repository
.lock()
.statuses(Path::new(""))
.log_err()
.unwrap_or_default();
let entries = state.snapshot.entries_by_path.clone();
let location_in_repo = state
.snapshot
.repository_entries
.get(&work_dir)
.and_then(|repo| repo.location_in_repo.clone());
let mut files =
state
.snapshot
@ -4363,10 +4365,11 @@ impl BackgroundScanner {
smol::block_on(update_job_tx.send(UpdateGitStatusesJob {
start_path: start_path.clone(),
end_path: end_path.clone(),
entries: entries.clone(),
location_in_repo: location_in_repo.clone(),
containing_repository: ScanJobContainingRepository {
work_directory: work_dir.clone(),
repository: repository.clone(),
staged_statuses: staged_statuses.clone(),
statuses: statuses.clone(),
},
}))
.unwrap();
@ -4414,16 +4417,12 @@ impl BackgroundScanner {
self.executor
.scoped(|scope| {
// Git status updates are currently not very parallelizable,
// because they need to lock the git repository. Limit the number
// of workers so that
for _ in 0..self.executor.num_cpus().min(3) {
for _ in 0..self.executor.num_cpus() {
scope.spawn(async {
let mut entries = Vec::with_capacity(GIT_STATUS_UPDATE_BATCH_SIZE);
loop {
select_biased! {
// Process any path refresh requests before moving on to process
// the queue of ignore statuses.
// the queue of git statuses.
request = self.scan_requests_rx.recv().fuse() => {
let Ok(request) = request else { break };
if !self.process_scan_request(request, true).await {
@ -4434,7 +4433,7 @@ impl BackgroundScanner {
// Process git status updates in batches.
job = update_job_rx.recv().fuse() => {
let Ok(job) = job else { break };
self.update_git_statuses(job, &mut entries);
self.update_git_statuses(job);
}
}
}
@ -4445,61 +4444,30 @@ impl BackgroundScanner {
}
/// Update the git statuses for a given batch of entries.
fn update_git_statuses(&self, job: UpdateGitStatusesJob, entries: &mut Vec<Entry>) {
fn update_git_statuses(&self, job: UpdateGitStatusesJob) {
// Determine which entries in this batch have changed their git status.
let t0 = Instant::now();
let repo_work_dir = &job.containing_repository.work_directory;
let state = self.state.lock();
let Some(repo_entry) = state
.snapshot
.repository_entries
.get(&repo_work_dir)
.cloned()
else {
return;
};
// Retrieve a batch of entries for this job, and then release the state lock.
entries.clear();
for entry in state
.snapshot
.traverse_from_path(true, false, false, &job.start_path)
{
let mut edits = Vec::new();
for entry in Traversal::new(&job.entries, true, false, false, &job.start_path) {
if job
.end_path
.as_ref()
.map_or(false, |end| &entry.path >= end)
|| !entry.path.starts_with(&repo_work_dir)
{
break;
}
entries.push(entry.clone());
}
drop(state);
// Determine which entries in this batch have changed their git status.
let mut edits = vec![];
for entry in entries.iter() {
let Ok(repo_path) = entry.path.strip_prefix(&repo_work_dir) else {
let Ok(repo_path) = entry
.path
.strip_prefix(&job.containing_repository.work_directory)
else {
continue;
};
let Some(mtime) = entry.mtime else {
continue;
};
let repo_path = RepoPath(if let Some(location) = &repo_entry.location_in_repo {
let repo_path = RepoPath(if let Some(location) = &job.location_in_repo {
location.join(repo_path)
} else {
repo_path.to_path_buf()
});
let git_status = combine_git_statuses(
job.containing_repository
.staged_statuses
.get(&repo_path)
.copied(),
job.containing_repository
.repository
.lock()
.unstaged_status(&repo_path, mtime),
);
let git_status = job.containing_repository.statuses.get(&repo_path);
if entry.git_status != git_status {
let mut entry = entry.clone();
entry.git_status = git_status;
@ -4508,20 +4476,22 @@ impl BackgroundScanner {
}
// Apply the git status changes.
let mut state = self.state.lock();
let path_changes = edits.iter().map(|edit| {
if let Edit::Insert(entry) = edit {
entry.path.clone()
} else {
unreachable!()
}
});
util::extend_sorted(&mut state.changed_paths, path_changes, usize::MAX, Ord::cmp);
state.snapshot.entries_by_path.edit(edits, &());
if edits.len() > 0 {
let mut state = self.state.lock();
let path_changes = edits.iter().map(|edit| {
if let Edit::Insert(entry) = edit {
entry.path.clone()
} else {
unreachable!()
}
});
util::extend_sorted(&mut state.changed_paths, path_changes, usize::MAX, Ord::cmp);
state.snapshot.entries_by_path.edit(edits, &());
}
log::trace!(
"refreshed git status of {} entries starting with {} in {:?}",
entries.len(),
"refreshed git status of entries starting with {} in {:?}",
// entries.len(),
job.start_path.display(),
t0.elapsed()
);
@ -4682,8 +4652,7 @@ struct ScanJob {
#[derive(Clone)]
struct ScanJobContainingRepository {
work_directory: RepositoryWorkDirectory,
repository: Arc<Mutex<dyn GitRepository>>,
staged_statuses: TreeMap<RepoPath, GitFileStatus>,
statuses: GitStatus,
}
struct UpdateIgnoreStatusJob {
@ -4694,9 +4663,11 @@ struct UpdateIgnoreStatusJob {
}
struct UpdateGitStatusesJob {
entries: SumTree<Entry>,
start_path: Arc<Path>,
end_path: Option<Arc<Path>>,
containing_repository: ScanJobContainingRepository,
location_in_repo: Option<Arc<Path>>,
}
pub trait WorktreeModelHandle {
@ -4906,6 +4877,26 @@ pub struct Traversal<'a> {
}
impl<'a> Traversal<'a> {
fn new(
entries: &'a SumTree<Entry>,
include_files: bool,
include_dirs: bool,
include_ignored: bool,
start_path: &Path,
) -> Self {
let mut cursor = entries.cursor();
cursor.seek(&TraversalTarget::Path(start_path), Bias::Left, &());
let mut traversal = Self {
cursor,
include_files,
include_dirs,
include_ignored,
};
if traversal.end_offset() == traversal.start_offset() {
traversal.next();
}
traversal
}
pub fn advance(&mut self) -> bool {
self.advance_by(1)
}
@ -5079,25 +5070,6 @@ impl<'a> TryFrom<(&'a CharBag, proto::Entry)> for Entry {
}
}
fn combine_git_statuses(
staged: Option<GitFileStatus>,
unstaged: Option<GitFileStatus>,
) -> Option<GitFileStatus> {
if let Some(staged) = staged {
if let Some(unstaged) = unstaged {
if unstaged == staged {
Some(staged)
} else {
Some(GitFileStatus::Modified)
}
} else {
Some(staged)
}
} else {
unstaged
}
}
fn git_status_from_proto(git_status: Option<i32>) -> Option<GitFileStatus> {
git_status.and_then(|status| {
proto::GitStatus::from_i32(status).map(|status| match status {