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Finally fix diff names (#13136)

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* Finally fix diff names

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

#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 #12771 and
uses these options to fix this.

Signed-off-by: Andrew Thornton <art27@cantab.net>

* Update services/gitdiff/gitdiff.go

* Update services/gitdiff/gitdiff.go

* Update modules/repofiles/temp_repo.go

* fix test

Signed-off-by: Andrew Thornton <art27@cantab.net>

Co-authored-by: Lauris BH <lauris@nix.lv>
pull/13140/head
zeripath 4 years ago committed by GitHub
parent aa73b7b7e5
commit edfebe65b1
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
3 changed files with 81 additions and 124 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
Show Stats Download Patch File Download Diff File
  1. 2
      modules/repofiles/temp_repo.go
  2. 126
      services/gitdiff/gitdiff.go
  3. 21
      services/gitdiff/gitdiff_test.go

2
modules/repofiles/temp_repo.go
Unescape View File

@ -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/", "--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)

126
services/gitdiff/gitdiff.go
Unescape View File

@ -483,45 +483,6 @@ 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 {
continue
}
@ -610,10 +571,42 @@ 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{
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
@ -622,7 +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 {
@ -633,8 +625,13 @@ func ParsePatch(maxLines, maxLineCharacters, maxFiles int, reader io.Reader) (*D
}
}
if curFile.Type != DiffFileRename {
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
@ -646,55 +643,12 @@ func ParsePatch(maxLines, maxLineCharacters, maxFiles int, reader io.Reader) (*D
case strings.HasPrefix(line, "similarity index 100%"):
curFile.Type = DiffFileRename
}
if curFile.Type > 0 && curFile.Type != DiffFileRename {
if curFile.Type > 0 {
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
}
}
}
}
}
}
@ -762,7 +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=\\b/", "-M"}
if len(whitespaceBehavior) != 0 {
diffArgs = append(diffArgs, whitespaceBehavior)
}

21
services/gitdiff/gitdiff_test.go
Unescape View File

@ -90,9 +90,9 @@ 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
+
@ -105,6 +105,7 @@ func TestParsePatch_singlefile(t *testing.T) {
addition: 4,
deletion: 1,
filename: "README.md",
oldFilename: "README.md",
},
{
name: "A \\ B",
@ -122,13 +123,14 @@ func TestParsePatch_singlefile(t *testing.T) {
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.
@ -141,10 +143,10 @@ 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
@ -156,6 +158,7 @@ index 898651a..0000000
addition: 0,
deletion: 5,
filename: "file with blanks",
oldFilename: "file with blanks",
},
{
name: "rename a—as",
@ -171,7 +174,7 @@ 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

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