Fix submodule parsing (go-gitea#32571) (go-gitea#32577)

A quick fix for go-gitea#32568
Partially backport from go-gitea#32571

Author: wxiaoguang

modules/git/commit.go

@@ -377,31 +377,43 @@ func (c *Commit) GetSubModules() (*ObjectCache, error) {
 	}
 
 	defer rd.Close()
+	return configParseSubModules(rd)
+}
+
+func configParseSubModules(rd io.Reader) (*ObjectCache, error) {
 	scanner := bufio.NewScanner(rd)
-	c.submoduleCache = newObjectCache()
-	var ismodule bool
-	var path string
+	submoduleCache := newObjectCache()
+	var subModule *SubModule
 	for scanner.Scan() {
-		if strings.HasPrefix(scanner.Text(), "[submodule") {
-			ismodule = true
+		line := strings.TrimSpace(scanner.Text())
+		if strings.HasPrefix(line, "[") {
+			if subModule != nil {
+				submoduleCache.Set(subModule.Name, subModule)
+				subModule = nil
+			}
+			if strings.HasPrefix(line, "[submodule") {
+				subModule = &SubModule{}
+			}
 			continue
 		}
-		if ismodule {
-			fields := strings.Split(scanner.Text(), "=")
+		if subModule != nil {
+			fields := strings.Split(line, "=")
 			k := strings.TrimSpace(fields[0])
 			if k == "path" {
-				path = strings.TrimSpace(fields[1])
+				subModule.Name = strings.TrimSpace(fields[1])
 			} else if k == "url" {
-				c.submoduleCache.Set(path, &SubModule{path, strings.TrimSpace(fields[1])})
-				ismodule = false
+				subModule.URL = strings.TrimSpace(fields[1])
 			}
 		}
 	}
-	if err = scanner.Err(); err != nil {
+	if subModule != nil {
+		submoduleCache.Set(subModule.Name, subModule)
+	}
+	if err := scanner.Err(); err != nil {
 		return nil, fmt.Errorf("GetSubModules scan: %w", err)
 	}
 
-	return c.submoduleCache, nil
+	return submoduleCache, nil
 }
 
 // GetSubModule get the sub module according entryname

modules/git/commit_test.go

@@ -135,7 +135,7 @@ author KN4CK3R <[email protected]> 1711702962 +0100
 committer KN4CK3R <[email protected]> 1711702962 +0100
 encoding ISO-8859-1
 gpgsig -----BEGIN PGP SIGNATURE-----
- 
+<SPACE>
  iQGzBAABCgAdFiEE9HRrbqvYxPT8PXbefPSEkrowAa8FAmYGg7IACgkQfPSEkrow
  Aa9olwv+P0HhtCM6CRvlUmPaqswRsDPNR4i66xyXGiSxdI9V5oJL7HLiQIM7KrFR
  gizKa2COiGtugv8fE+TKqXKaJx6uJUJEjaBd8E9Af9PrAzjWj+A84lU6/PgPS8hq
@@ -150,7 +150,7 @@ gpgsig -----BEGIN PGP SIGNATURE-----
  -----END PGP SIGNATURE-----
 
 ISO-8859-1`
-
+	commitString = strings.ReplaceAll(commitString, "<SPACE>", " ")
 	sha := &Sha1Hash{0xfe, 0xaf, 0x4b, 0xa6, 0xbc, 0x63, 0x5f, 0xec, 0x44, 0x2f, 0x46, 0xdd, 0xd4, 0x51, 0x24, 0x16, 0xec, 0x43, 0xc2, 0xc2}
 	gitRepo, err := openRepositoryWithDefaultContext(filepath.Join(testReposDir, "repo1_bare"))
 	assert.NoError(t, err)
@@ -362,3 +362,41 @@ func Test_GetCommitBranchStart(t *testing.T) {
 	assert.NotEmpty(t, startCommitID)
 	assert.EqualValues(t, "9c9aef8dd84e02bc7ec12641deb4c930a7c30185", startCommitID)
 }
+
+func TestConfigSubModule(t *testing.T) {
+	input := `
+[core]
+path = test
+
+[submodule "submodule1"]
+	path = path1
+	url =	https://gitea.io/foo/foo
+	#branch = b1
+
+[other1]
+branch = master
+
+[submodule "submodule2"]
+	path = path2
+	url =	https://gitea.io/bar/bar
+	branch = b2
+
+[other2]
+branch = main
+
+[submodule "submodule3"]
+	path = path3
+	url =	https://gitea.io/xxx/xxx
+`
+
+	subModules, err := configParseSubModules(strings.NewReader(input))
+	assert.NoError(t, err)
+	assert.Len(t, subModules.cache, 3)
+
+	sm1, _ := subModules.Get("path1")
+	assert.Equal(t, &SubModule{Name: "path1", URL: "https://gitea.io/foo/foo"}, sm1)
+	sm2, _ := subModules.Get("path2")
+	assert.Equal(t, &SubModule{Name: "path2", URL: "https://gitea.io/bar/bar"}, sm2)
+	sm3, _ := subModules.Get("path3")
+	assert.Equal(t, &SubModule{Name: "path3", URL: "https://gitea.io/xxx/xxx"}, sm3)
+}