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Fix yet another bug with diff file names (go-gitea#12771)
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Backport go-gitea#12771

Following further testing it has become apparent that the diff line
cannot be used to determine filenames for diffs with any sort of predictability
the answer therefore is to use the other lines that are provided with a diff

Fix go-gitea#12768

Signed-off-by: Andrew Thornton <[email protected]>
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@zeripath
zeripath committed Sep 9, 2020
1 parent 7a25441 commit 5955d56
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Showing 3 changed files with 246 additions and 48 deletions.
2 changes: 1 addition & 1 deletion modules/templates/helper.go
View file
Original file line number Diff line number Diff line change
Expand Up @@ -619,7 +619,7 @@ func ActionContent2Commits(act Actioner) *repository.PushCommits {
// DiffTypeToStr returns diff type name
func DiffTypeToStr(diffType int) string {
diffTypes := map[int]string{
1: "add", 2: "modify", 3: "del", 4: "rename",
1: "add", 2: "modify", 3: "del", 4: "rename", 5: "copy",
}
return diffTypes[diffType]
}
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151 changes: 105 additions & 46 deletions services/gitdiff/gitdiff.go
View file
Original file line number Diff line number Diff line change
Expand Up @@ -53,6 +53,7 @@ const (
DiffFileChange
DiffFileDel
DiffFileRename
DiffFileCopy
)

// DiffLineExpandDirection represents the DiffLineSection expand direction
Expand Down Expand Up @@ -447,7 +448,46 @@ func ParsePatch(maxLines, maxLineCharacters, maxFiles int, reader io.Reader) (*D
}
line := linebuf.String()

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

Expand Down Expand Up @@ -531,36 +571,10 @@ 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)
} else {
fmt.Fscanf(rd, "%s ", &a)
}
char, _ = rd.ReadByte()
_ = rd.UnreadByte()
if char == '"' {
fmt.Fscanf(rd, "%q", &b)
} 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,
Index: len(diff.Files) + 1,
Type: DiffFileChange,
Sections: make([]*DiffSection, 0, 10),
}
diff.Files = append(diff.Files, curFile)
curFileLinesCount = 0
Expand All @@ -569,6 +583,7 @@ 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 @@ -579,23 +594,67 @@ func ParsePatch(maxLines, maxLineCharacters, maxFiles int, reader io.Reader) (*D
}
}

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 {
if strings.HasSuffix(line, " 160000\n") {
curFile.IsSubmodule = true
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
}
}
break
}
}
}
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141 changes: 140 additions & 1 deletion services/gitdiff/gitdiff_test.go
View file
Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,7 @@
package gitdiff

import (
"encoding/json"
"fmt"
"html/template"
"strings"
Expand Down Expand Up @@ -41,7 +42,145 @@ func TestDiffToHTML(t *testing.T) {
}, DiffLineDel))
}

func TestParsePatch(t *testing.T) {
func TestParsePatch_singlefile(t *testing.T) {
type testcase struct {
name string
gitdiff string
wantErr bool
addition int
deletion int
oldFilename string
filename string
}

tests := []testcase{
{
name: "readme.md2readme.md",
gitdiff: `diff --git "a/README.md" "b/README.md"
--- a/README.md
+++ b/README.md
@@ -1,3 +1,6 @@
# gitea-github-migrator
+
+ Build Status
- Latest Release
Docker Pulls
+ cut off
+ cut off
`,
addition: 4,
deletion: 1,
filename: "README.md",
},
{
name: "A \\ B",
gitdiff: `diff --git "a/A \\ B" "b/A \\ B"
--- "a/A \\ B"
+++ "b/A \\ B"
@@ -1,3 +1,6 @@
# gitea-github-migrator
+
+ Build Status
- Latest Release
Docker Pulls
+ cut off
+ cut off`,
addition: 4,
deletion: 1,
filename: "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
index d2186f1..f5c8ed2 100644
--- a/a b/file b/a a/file
+++ b/a b/file b/a a/file
@@ -1,3 +1,2 @@
Create a weird file.
-and what does diff do here?
\ No newline at end of file`,
addition: 0,
deletion: 1,
filename: "a b/file b/a a/file",
oldFilename: "a b/file b/a a/file",
},
{
name: "delete 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
+++ /dev/null
@@ -1,5 +0,0 @@
-a blank file
-
-has a couple o line
-
-the 5th line is the last
`,
addition: 0,
deletion: 5,
filename: "file with blanks",
},
{
name: "rename a—as",
gitdiff: `diff --git "a/\360\243\220\265b\342\200\240vs" "b/a\342\200\224as"
similarity index 100%
rename from "\360\243\220\265b\342\200\240vs"
rename to "a\342\200\224as"
`,
addition: 0,
deletion: 0,
oldFilename: "𣐵b†vs",
filename: "a—as",
},
{
name: "rename with spaces",
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
`,
oldFilename: "a b/file b/a a/file",
filename: "a b/a a/file b/b file",
},
}

for _, testcase := range tests {
t.Run(testcase.name, func(t *testing.T) {
got, err := ParsePatch(setting.Git.MaxGitDiffLines, setting.Git.MaxGitDiffLineCharacters, setting.Git.MaxGitDiffFiles, strings.NewReader(testcase.gitdiff))
if (err != nil) != testcase.wantErr {
t.Errorf("ParsePatch() error = %v, wantErr %v", err, testcase.wantErr)
return
}
gotMarshaled, _ := json.MarshalIndent(got, " ", " ")
if got.NumFiles() != 1 {
t.Errorf("ParsePath() did not receive 1 file:\n%s", string(gotMarshaled))
return
}
if got.TotalAddition != testcase.addition {
t.Errorf("ParsePath() does not have correct totalAddition %d, wanted %d", got.TotalAddition, testcase.addition)
}
if got.TotalDeletion != testcase.deletion {
t.Errorf("ParsePath() did not have correct totalDeletion %d, wanted %d", got.TotalDeletion, testcase.deletion)
}
file := got.Files[0]
if file.Addition != testcase.addition {
t.Errorf("ParsePath() does not have correct file addition %d, wanted %d", file.Addition, testcase.addition)
}
if file.Deletion != testcase.deletion {
t.Errorf("ParsePath() did not have correct file deletion %d, wanted %d", file.Deletion, testcase.deletion)
}
if file.OldName != testcase.oldFilename {
t.Errorf("ParsePath() did not have correct OldName %s, wanted %s", file.OldName, testcase.oldFilename)
}
if file.Name != testcase.filename {
t.Errorf("ParsePath() did not have correct Name %s, wanted %s", file.Name, testcase.filename)
}
})
}

var diff = `diff --git "a/README.md" "b/README.md"
--- a/README.md
+++ b/README.md
Expand Down

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