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Fix missing close in WalkGitLog (#17008)

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When the external context is cancelled it is possible for the
GitLogReader to not itself be Closed.

This PR does three things:

1. Instead of adding a plain defer it wraps the `g.Close` in a func as
`g` may change.
2. It adds the missing explicit g.Close - although the defer fix makes
this unnecessary.
3. It passes down the external context as the base context for the
GitLogReader meaning that the cancellation of the external context will
pass down automatically.

Fix #17007

Signed-off-by: Andrew Thornton <art27@cantab.net>
This commit is contained in:
zeripath 2021-09-10 10:46:12 +01:00 committed by GitHub
parent 248b96d8a3
commit 0faf175694
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GPG key ID: 4AEE18F83AFDEB23
1 changed files with 16 additions and 7 deletions
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23
modules/git/log_name_status.go
View file

@ -18,11 +18,16 @@ import (
)
// LogNameStatusRepo opens git log --raw in the provided repo and returns a stdin pipe, a stdout reader and cancel function
func LogNameStatusRepo(repository, head, treepath string, paths ...string) (*bufio.Reader, func()) {
func LogNameStatusRepo(ctx context.Context, repository, head, treepath string, paths ...string) (*bufio.Reader, func()) {
// We often want to feed the commits in order into cat-file --batch, followed by their trees and sub trees as necessary.
// so let's create a batch stdin and stdout
stdoutReader, stdoutWriter := nio.Pipe(buffer.New(32 * 1024))
// Lets also create a context so that we can absolutely ensure that the command should die when we're done
ctx, ctxCancel := context.WithCancel(ctx)
cancel := func() {
ctxCancel()
_ = stdoutReader.Close()
_ = stdoutWriter.Close()
}
@ -50,7 +55,7 @@ func LogNameStatusRepo(repository, head, treepath string, paths ...string) (*buf
go func() {
stderr := strings.Builder{}
err := NewCommand(args...).RunInDirFullPipeline(repository, stdoutWriter, &stderr, nil)
err := NewCommandContext(ctx, args...).RunInDirFullPipeline(repository, stdoutWriter, &stderr, nil)
if err != nil {
_ = stdoutWriter.CloseWithError(ConcatenateError(err, (&stderr).String()))
} else {
@ -75,8 +80,8 @@ type LogNameStatusRepoParser struct {
}
// NewLogNameStatusRepoParser returns a new parser for a git log raw output
func NewLogNameStatusRepoParser(repository, head, treepath string, paths ...string) *LogNameStatusRepoParser {
rd, cancel := LogNameStatusRepo(repository, head, treepath, paths...)
func NewLogNameStatusRepoParser(ctx context.Context, repository, head, treepath string, paths ...string) *LogNameStatusRepoParser {
rd, cancel := LogNameStatusRepo(ctx, repository, head, treepath, paths...)
return &LogNameStatusRepoParser{
treepath: treepath,
paths: paths,
@ -311,8 +316,11 @@ func WalkGitLog(ctx context.Context, repo *Repository, head *Commit, treepath st
}
}
g := NewLogNameStatusRepoParser(repo.Path, head.ID.String(), treepath, paths...)
defer g.Close()
g := NewLogNameStatusRepoParser(ctx, repo.Path, head.ID.String(), treepath, paths...)
// don't use defer g.Close() here as g may change its value - instead wrap in a func
defer func() {
g.Close()
}()
results := make([]string, len(paths))
remaining := len(paths)
@ -331,6 +339,7 @@ heaploop:
for {
select {
case <-ctx.Done():
g.Close()
return nil, ctx.Err()
default:
}
@ -380,7 +389,7 @@ heaploop:
remainingPaths = append(remainingPaths, pth)
}
}
g = NewLogNameStatusRepoParser(repo.Path, lastEmptyParent, treepath, remainingPaths...)
g = NewLogNameStatusRepoParser(ctx, repo.Path, lastEmptyParent, treepath, remainingPaths...)
parentRemaining = map[string]bool{}
nextRestart = (remaining * 3) / 4
continue heaploop