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Finally fix diff names
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go-gitea#12771 attempted to fix diff by avoiding the git diff line as
it is possible to have an ambiguous line here.

go-gitea#12254 attempted to fix diff by assuming that names would quoted
if they needed to be and if one was quoted then both would be.

Both of these were wrong.

I have now discovered `--src-prefix` and `--dst-prefix` which
means that we can set this in such a way to force the git diff
to always be unambiguous.

Therefore this PR rollsback most of the changes in go-gitea#12771 and
uses these options to fix this.

Signed-off-by: Andrew Thornton <[email protected]>
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@zeripath
zeripath committed Oct 13, 2020
1 parent da32d0e commit 8c2b61c
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Showing 2 changed files with 61 additions and 106 deletions.
2 changes: 1 addition & 1 deletion modules/repofiles/temp_repo.go
View file
Original file line number Diff line number Diff line change
Expand Up @@ -292,7 +292,7 @@ func (t *TemporaryUploadRepository) DiffIndex() (*gitdiff.Diff, error) {
var diff *gitdiff.Diff
var finalErr error

if err := git.NewCommand("diff-index", "--cached", "-p", "HEAD").
if err := git.NewCommand("diff-index", "--src-prefix=\\a/", "--dest-prefix=\\b/", "--cached", "-p", "HEAD").
RunInDirTimeoutEnvFullPipelineFunc(nil, 30*time.Second, t.basePath, stdoutWriter, stderr, nil, func(ctx context.Context, cancel context.CancelFunc) error {
_ = stdoutWriter.Close()
diff, finalErr = gitdiff.ParsePatch(setting.Git.MaxGitDiffLines, setting.Git.MaxGitDiffLineCharacters, setting.Git.MaxGitDiffFiles, stdoutReader)
Expand Down
165 changes: 60 additions & 105 deletions services/gitdiff/gitdiff.go
View file
Original file line number Diff line number Diff line change
Expand Up @@ -482,46 +482,7 @@ func ParsePatch(maxLines, maxLineCharacters, maxFiles int, reader io.Reader) (*D
}
line := linebuf.String()

if strings.HasPrefix(line, "--- ") {
if line[4] == '"' {
fmt.Sscanf(line[4:], "%q", &curFile.OldName)
} else {
curFile.OldName = line[4:]
if strings.Contains(curFile.OldName, " ") {
// Git adds a terminal \t if there is a space in the name
curFile.OldName = curFile.OldName[:len(curFile.OldName)-1]
}
}
if curFile.OldName[0:2] == "a/" {
curFile.OldName = curFile.OldName[2:]
}
continue
} else if strings.HasPrefix(line, "+++ ") {
if line[4] == '"' {
fmt.Sscanf(line[4:], "%q", &curFile.Name)
} else {
curFile.Name = line[4:]
if strings.Contains(curFile.Name, " ") {
// Git adds a terminal \t if there is a space in the name
curFile.Name = curFile.Name[:len(curFile.Name)-1]
}
}
if curFile.Name[0:2] == "b/" {
curFile.Name = curFile.Name[2:]
}
curFile.IsRenamed = (curFile.Name != curFile.OldName) && !(curFile.IsCreated || curFile.IsDeleted)
if curFile.IsDeleted {
curFile.Name = curFile.OldName
curFile.OldName = ""
} else if curFile.IsCreated {
curFile.OldName = ""
}
continue
} else if len(line) == 0 {
continue
}

if strings.HasPrefix(line, "+++") || strings.HasPrefix(line, "---") || len(line) == 0 {
if strings.HasPrefix(line, "+++ ") || strings.HasPrefix(line, "--- ") || len(line) == 0 {
continue
}

Expand Down Expand Up @@ -609,10 +570,43 @@ func ParsePatch(maxLines, maxLineCharacters, maxFiles int, reader io.Reader) (*D
break
}

// Note: In case file name is surrounded by double quotes (it happens only in git-shell).
// e.g. diff --git "a/xxx" "b/xxx"
var a string
var b string

rd := strings.NewReader(line[len(cmdDiffHead):])
char, _ := rd.ReadByte()
_ = rd.UnreadByte()
if char == '"' {
fmt.Fscanf(rd, "%q ", &a)
fmt.Printf("read %s", a)
if a[0] == '\\' {
a = a[1:]
}
} else {
fmt.Fscanf(rd, "%s ", &a)
}
char, _ = rd.ReadByte()
_ = rd.UnreadByte()
if char == '"' {
fmt.Fscanf(rd, "%q", &b)
if b[0] == '\\' {
b = b[1:]
}
} else {
fmt.Fscanf(rd, "%s", &b)
}
a = a[2:]
b = b[2:]

curFile = &DiffFile{
Index: len(diff.Files) + 1,
Type: DiffFileChange,
Sections: make([]*DiffSection, 0, 10),
Name: b,
OldName: a,
Index: len(diff.Files) + 1,
Type: DiffFileChange,
Sections: make([]*DiffSection, 0, 10),
IsRenamed: a != b,
}
diff.Files = append(diff.Files, curFile)
curFileLinesCount = 0
Expand All @@ -621,7 +615,6 @@ func ParsePatch(maxLines, maxLineCharacters, maxFiles int, reader io.Reader) (*D
curFileLFSPrefix = false

// Check file diff type and is submodule.
loop:
for {
line, err := input.ReadString('\n')
if err != nil {
Expand All @@ -632,67 +625,29 @@ func ParsePatch(maxLines, maxLineCharacters, maxFiles int, reader io.Reader) (*D
}
}

if curFile.Type != DiffFileRename {
switch {
case strings.HasPrefix(line, "new file"):
curFile.Type = DiffFileAdd
curFile.IsCreated = true
case strings.HasPrefix(line, "deleted"):
curFile.Type = DiffFileDel
curFile.IsDeleted = true
case strings.HasPrefix(line, "index"):
curFile.Type = DiffFileChange
case strings.HasPrefix(line, "similarity index 100%"):
curFile.Type = DiffFileRename
}
if curFile.Type > 0 && curFile.Type != DiffFileRename {
if strings.HasSuffix(line, " 160000\n") {
curFile.IsSubmodule = true
}
break
}
} else {
switch {
case strings.HasPrefix(line, "rename from "):
if line[12] == '"' {
fmt.Sscanf(line[12:], "%q", &curFile.OldName)
} else {
curFile.OldName = line[12:]
curFile.OldName = curFile.OldName[:len(curFile.OldName)-1]
}
case strings.HasPrefix(line, "rename to "):
if line[10] == '"' {
fmt.Sscanf(line[10:], "%q", &curFile.Name)
} else {
curFile.Name = line[10:]
curFile.Name = curFile.Name[:len(curFile.Name)-1]
}
curFile.IsRenamed = true
break loop
case strings.HasPrefix(line, "copy from "):
if line[10] == '"' {
fmt.Sscanf(line[10:], "%q", &curFile.OldName)
} else {
curFile.OldName = line[10:]
curFile.OldName = curFile.OldName[:len(curFile.OldName)-1]
}
case strings.HasPrefix(line, "copy to "):
if line[8] == '"' {
fmt.Sscanf(line[8:], "%q", &curFile.Name)
} else {
curFile.Name = line[8:]
curFile.Name = curFile.Name[:len(curFile.Name)-1]
}
curFile.IsRenamed = true
curFile.Type = DiffFileCopy
break loop
default:
if strings.HasSuffix(line, " 160000\n") {
curFile.IsSubmodule = true
} else {
break loop
}
switch {
case strings.HasPrefix(line, "copy from "):
curFile.IsRenamed = true
curFile.Type = DiffFileCopy
case strings.HasPrefix(line, "copy to "):
curFile.IsRenamed = true
curFile.Type = DiffFileCopy
case strings.HasPrefix(line, "new file"):
curFile.Type = DiffFileAdd
curFile.IsCreated = true
case strings.HasPrefix(line, "deleted"):
curFile.Type = DiffFileDel
curFile.IsDeleted = true
case strings.HasPrefix(line, "index"):
curFile.Type = DiffFileChange
case strings.HasPrefix(line, "similarity index 100%"):
curFile.Type = DiffFileRename
}
if curFile.Type > 0 {
if strings.HasSuffix(line, " 160000\n") {
curFile.IsSubmodule = true
}
break
}
}
}
Expand Down Expand Up @@ -761,7 +716,7 @@ func GetDiffRangeWithWhitespaceBehavior(repoPath, beforeCommitID, afterCommitID
parentCommit, _ := commit.Parent(0)
actualBeforeCommitID = parentCommit.ID.String()
}
diffArgs := []string{"diff", "-M"}
diffArgs := []string{"diff", "--src-prefix=\\a/", "--dst-prefix=\\d/", "-M"}
if len(whitespaceBehavior) != 0 {
diffArgs = append(diffArgs, whitespaceBehavior)
}
Expand Down

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