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Fix issue with DiffIndex on initial commit (#11677)

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Unfortunately #11614 introduced a bug whereby the initial commit of a
repository could not be seen due to there being no parent commit to
create a clear diff from.

Here we create a diffstat from the difference between the parentless SHA and the SHA of the empty tree - a constant known to git. (With thanks to @L0veSunshine for informing me of this SHA)

Thanks to @a1012112796 for initial attempt to fix.

Fix #11650

Closes #11674

Signed-off-by: Andrew Thornton <art27@cantab.net>
Co-Authored-By: L0veSunshine <xuan199651@gmail.com>
This commit is contained in:
zeripath 2020-05-29 22:14:00 +01:00 committed by GitHub
parent 141d52cc0f
commit 6e4480835f
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
2 changed files with 9 additions and 2 deletions
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3
modules/git/sha1.go
View file

@ -17,6 +17,9 @@ import (
// EmptySHA defines empty git SHA
const EmptySHA = "0000000000000000000000000000000000000000"
// EmptyTreeSHA is the SHA of an empty tree
const EmptyTreeSHA = "4b825dc642cb6eb9a060e54bf8d69288fbee4904"
// SHAPattern can be used to determine if a string is an valid sha
var SHAPattern = regexp.MustCompile(`^[0-9a-f]{4,40}$`)

8
services/gitdiff/gitdiff.go
View file

@ -664,7 +664,7 @@ func GetDiffRangeWithWhitespaceBehavior(repoPath, beforeCommitID, afterCommitID
ctx, cancel := context.WithCancel(git.DefaultContext)
defer cancel()
var cmd *exec.Cmd
if len(beforeCommitID) == 0 && commit.ParentCount() == 0 {
if (len(beforeCommitID) == 0 || beforeCommitID == git.EmptySHA) && commit.ParentCount() == 0 {
cmd = exec.CommandContext(ctx, git.GitExecutable, "show", afterCommitID)
} else {
actualBeforeCommitID := beforeCommitID
@ -711,7 +711,11 @@ func GetDiffRangeWithWhitespaceBehavior(repoPath, beforeCommitID, afterCommitID
return nil, fmt.Errorf("Wait: %v", err)
}
diff.NumFiles, diff.TotalAddition, diff.TotalDeletion, err = git.GetDiffShortStat(repoPath, beforeCommitID+"..."+afterCommitID)
shortstatArgs := []string{beforeCommitID + "..." + afterCommitID}
if len(beforeCommitID) == 0 || beforeCommitID == git.EmptySHA {
shortstatArgs = []string{git.EmptyTreeSHA, afterCommitID}
}
diff.NumFiles, diff.TotalAddition, diff.TotalDeletion, err = git.GetDiffShortStat(repoPath, shortstatArgs...)
if err != nil {
return nil, err
}