Finally fix diff names (#13136) (#13139)

Backport #13136

it is possible to have an ambiguous line here.

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 #12771 and
uses these options to fix this.

Signed-off-by: Andrew Thornton <art27@cantab.net>
This commit is contained in:
zeripath 2020-10-14 12:27:21 +01:00 committed by GitHub
parent 09abdb8a65
commit 99fb256411
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
3 changed files with 81 additions and 124 deletions

View file

@ -278,7 +278,7 @@ 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/", "--dst-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)

View file

@ -448,46 +448,7 @@ 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
}
@ -571,10 +532,42 @@ 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)
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
@ -583,7 +576,6 @@ 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 {
@ -594,67 +586,29 @@ 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
}
}
}
@ -723,7 +677,7 @@ 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=\\b/", "-M"}
if len(whitespaceBehavior) != 0 {
diffArgs = append(diffArgs, whitespaceBehavior)
}

View file

@ -56,9 +56,9 @@ func TestParsePatch_singlefile(t *testing.T) {
tests := []testcase{
{
name: "readme.md2readme.md",
gitdiff: `diff --git "a/README.md" "b/README.md"
--- a/README.md
+++ b/README.md
gitdiff: `diff --git "\\a/README.md" "\\b/README.md"
--- "\\a/README.md"
+++ "\\b/README.md"
@@ -1,3 +1,6 @@
# gitea-github-migrator
+
@ -68,9 +68,10 @@ func TestParsePatch_singlefile(t *testing.T) {
+ cut off
+ cut off
`,
addition: 4,
deletion: 1,
filename: "README.md",
addition: 4,
deletion: 1,
filename: "README.md",
oldFilename: "README.md",
},
{
name: "A \\ B",
@ -85,16 +86,17 @@ func TestParsePatch_singlefile(t *testing.T) {
Docker Pulls
+ cut off
+ cut off`,
addition: 4,
deletion: 1,
filename: "A \\ B",
addition: 4,
deletion: 1,
filename: "A \\ B",
oldFilename: "A \\ B",
},
{
name: "really weird filename",
gitdiff: `diff --git a/a b/file b/a a/file b/a b/file b/a a/file
gitdiff: `diff --git "\\a/a b/file b/a a/file" "\\b/a b/file b/a a/file"
index d2186f1..f5c8ed2 100644
--- a/a b/file b/a a/file
+++ b/a b/file b/a a/file
--- "\\a/a b/file b/a a/file"
+++ "\\b/a b/file b/a a/file"
@@ -1,3 +1,2 @@
Create a weird file.
@ -107,10 +109,10 @@ index d2186f1..f5c8ed2 100644
},
{
name: "delete file with blanks",
gitdiff: `diff --git a/file with blanks b/file with blanks
gitdiff: `diff --git "\\a/file with blanks" "\\b/file with blanks"
deleted file mode 100644
index 898651a..0000000
--- a/file with blanks
--- "\\a/file with blanks"
+++ /dev/null
@@ -1,5 +0,0 @@
-a blank file
@ -119,9 +121,10 @@ index 898651a..0000000
-
-the 5th line is the last
`,
addition: 0,
deletion: 5,
filename: "file with blanks",
addition: 0,
deletion: 5,
filename: "file with blanks",
oldFilename: "file with blanks",
},
{
name: "rename a—as",
@ -137,7 +140,7 @@ rename to "a\342\200\224as"
},
{
name: "rename with spaces",
gitdiff: `diff --git a/a b/file b/a a/file b/a b/a a/file b/b file
gitdiff: `diff --git "\\a/a b/file b/a a/file" "\\b/a b/a a/file b/b file"
similarity index 100%
rename from a b/file b/a a/file
rename to a b/a a/file b/b file