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HasPreviousCommit causes recursive load of commits unnecessarily (#14598)

This PR improves HasPreviousCommit to prevent the automatic and recursive loading
of previous commits using git merge-base --is-ancestor and git rev-list

Fix #13684

Signed-off-by: Andrew Thornton <art27@cantab.net>
mj-v1.14.3
zeripath 2 years ago
committed by GitHub
parent
commit
f9abf94bd9
No known key found for this signature in database GPG Key ID: 4AEE18F83AFDEB23
  1. 38
      modules/git/commit.go
  2. 25
      modules/git/commit_test.go

38
modules/git/commit.go

@ -9,6 +9,7 @@ import (
"bufio"
"bytes"
"container/list"
"errors"
"fmt"
"image"
"image/color"
@ -17,6 +18,7 @@ import (
_ "image/png" // for processing png images
"io"
"net/http"
"os/exec"
"strconv"
"strings"
)
@ -264,23 +266,33 @@ func (c *Commit) CommitsBefore() (*list.List, error) {
// HasPreviousCommit returns true if a given commitHash is contained in commit's parents
func (c *Commit) HasPreviousCommit(commitHash SHA1) (bool, error) {
for i := 0; i < c.ParentCount(); i++ {
commit, err := c.Parent(i)
if err != nil {
return false, err
}
if commit.ID == commitHash {
this := c.ID.String()
that := commitHash.String()
if this == that {
return false, nil
}
if err := CheckGitVersionAtLeast("1.8"); err == nil {
_, err := NewCommand("merge-base", "--is-ancestor", that, this).RunInDir(c.repo.Path)
if err == nil {
return true, nil
}
commitInParentCommit, err := commit.HasPreviousCommit(commitHash)
if err != nil {
return false, err
}
if commitInParentCommit {
return true, nil
var exitError *exec.ExitError
if errors.As(err, &exitError) {
if exitError.ProcessState.ExitCode() == 1 && len(exitError.Stderr) == 0 {
return false, nil
}
}
return false, err
}
result, err := NewCommand("rev-list", "--ancestry-path", "-n1", that+".."+this, "--").RunInDir(c.repo.Path)
if err != nil {
return false, err
}
return false, nil
return len(strings.TrimSpace(result)) > 0, nil
}
// CommitsBeforeLimit returns num commits before current revision

25
modules/git/commit_test.go

@ -105,3 +105,28 @@ empty commit`, commitFromReader.Signature.Payload)
commitFromReader.Signature.Payload += "\n\n"
assert.EqualValues(t, commitFromReader, commitFromReader2)
}
func TestHasPreviousCommit(t *testing.T) {
bareRepo1Path := filepath.Join(testReposDir, "repo1_bare")
repo, err := OpenRepository(bareRepo1Path)
assert.NoError(t, err)
commit, err := repo.GetCommit("8006ff9adbf0cb94da7dad9e537e53817f9fa5c0")
assert.NoError(t, err)
parentSHA := MustIDFromString("8d92fc957a4d7cfd98bc375f0b7bb189a0d6c9f2")
notParentSHA := MustIDFromString("2839944139e0de9737a044f78b0e4b40d989a9e3")
haz, err := commit.HasPreviousCommit(parentSHA)
assert.NoError(t, err)
assert.True(t, haz)
hazNot, err := commit.HasPreviousCommit(notParentSHA)
assert.NoError(t, err)
assert.False(t, hazNot)
selfNot, err := commit.HasPreviousCommit(commit.ID)
assert.NoError(t, err)
assert.False(t, selfNot)
}
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