Use the database object format name but not read from git repoisitory everytime and fix possible migration wrong objectformat when migrating a sha256 repository (#29294)

Now we can get object format name from git command line or from the
database repository table. Assume the column is right, we don't need to
read from git command line every time.

This also fixed a possible bug that the object format is wrong when
migrating a sha256 repository from external.

<img width="658" alt="image"
src="https://github.com/go-gitea/gitea/assets/81045/6e9a9dcf-13bf-4267-928b-6bf2c2560423">

2 files changed, 10 insertions, 19 deletions

diff --git a/modules/context/api.go b/modules/context/api.go
index f8bc682fed..b18a206b5e 100644
--- a/modules/context/api.go
+++ b/modules/context/api.go
@@ -307,12 +307,6 @@ func RepoRefForAPI(next http.Handler) http.Handler {
 			return
 		}
 
-		objectFormat, err := ctx.Repo.GitRepo.GetObjectFormat()
-		if err != nil {
-			ctx.Error(http.StatusInternalServerError, "GetCommit", err)
-			return
-		}
-
 		if ref := ctx.FormTrim("ref"); len(ref) > 0 {
 			commit, err := ctx.Repo.GitRepo.GetCommit(ref)
 			if err != nil {
@@ -331,6 +325,7 @@ func RepoRefForAPI(next http.Handler) http.Handler {
 		}
 
 		refName := getRefName(ctx.Base, ctx.Repo, RepoRefAny)
+		var err error
 
 		if ctx.Repo.GitRepo.IsBranchExist(refName) {
 			ctx.Repo.Commit, err = ctx.Repo.GitRepo.GetBranchCommit(refName)
@@ -346,7 +341,7 @@ func RepoRefForAPI(next http.Handler) http.Handler {
 				return
 			}
 			ctx.Repo.CommitID = ctx.Repo.Commit.ID.String()
-		} else if len(refName) == objectFormat.FullLength() {
+		} else if len(refName) == ctx.Repo.GetObjectFormat().FullLength() {
 			ctx.Repo.CommitID = refName
 			ctx.Repo.Commit, err = ctx.Repo.GitRepo.GetCommit(refName)
 			if err != nil {
diff --git a/modules/context/repo.go b/modules/context/repo.go
index 8508d46cf4..a73d09ee21 100644
--- a/modules/context/repo.go
+++ b/modules/context/repo.go
@@ -83,6 +83,10 @@ func (r *Repository) CanCreateBranch() bool {
 	return r.Permission.CanWrite(unit_model.TypeCode) && r.Repository.CanCreateBranch()
 }
 
+func (r *Repository) GetObjectFormat() git.ObjectFormat {
+	return git.ObjectFormatFromName(r.Repository.ObjectFormatName)
+}
+
 // RepoMustNotBeArchived checks if a repo is archived
 func RepoMustNotBeArchived() func(ctx *Context) {
 	return func(ctx *Context) {
@@ -830,9 +834,8 @@ func getRefName(ctx *Base, repo *Repository, pathType RepoRefType) string {
 		}
 		// For legacy and API support only full commit sha
 		parts := strings.Split(path, "/")
-		objectFormat, _ := repo.GitRepo.GetObjectFormat()
 
-		if len(parts) > 0 && len(parts[0]) == objectFormat.FullLength() {
+		if len(parts) > 0 && len(parts[0]) == git.ObjectFormatFromName(repo.Repository.ObjectFormatName).FullLength() {
 			repo.TreePath = strings.Join(parts[1:], "/")
 			return parts[0]
 		}
@@ -876,9 +879,8 @@ func getRefName(ctx *Base, repo *Repository, pathType RepoRefType) string {
 		return getRefNameFromPath(ctx, repo, path, repo.GitRepo.IsTagExist)
 	case RepoRefCommit:
 		parts := strings.Split(path, "/")
-		objectFormat, _ := repo.GitRepo.GetObjectFormat()
 
-		if len(parts) > 0 && len(parts[0]) >= 7 && len(parts[0]) <= objectFormat.FullLength() {
+		if len(parts) > 0 && len(parts[0]) >= 7 && len(parts[0]) <= repo.GetObjectFormat().FullLength() {
 			repo.TreePath = strings.Join(parts[1:], "/")
 			return parts[0]
 		}
@@ -937,12 +939,6 @@ func RepoRefByType(refType RepoRefType, ignoreNotExistErr ...bool) func(*Context
 			}
 		}
 
-		objectFormat, err := ctx.Repo.GitRepo.GetObjectFormat()
-		if err != nil {
-			log.Error("Cannot determine objectFormat for repository: %w", err)
-			ctx.Repo.Repository.MarkAsBrokenEmpty()
-		}
-
 		// Get default branch.
 		if len(ctx.Params("*")) == 0 {
 			refName = ctx.Repo.Repository.DefaultBranch
@@ -1009,7 +1005,7 @@ func RepoRefByType(refType RepoRefType, ignoreNotExistErr ...bool) func(*Context
 					return cancel
 				}
 				ctx.Repo.CommitID = ctx.Repo.Commit.ID.String()
-			} else if len(refName) >= 7 && len(refName) <= objectFormat.FullLength() {
+			} else if len(refName) >= 7 && len(refName) <= ctx.Repo.GetObjectFormat().FullLength() {
 				ctx.Repo.IsViewCommit = true
 				ctx.Repo.CommitID = refName
 
@@ -1019,7 +1015,7 @@ func RepoRefByType(refType RepoRefType, ignoreNotExistErr ...bool) func(*Context
 					return cancel
 				}
 				// If short commit ID add canonical link header
-				if len(refName) < objectFormat.FullLength() {
+				if len(refName) < ctx.Repo.GetObjectFormat().FullLength() {
 					ctx.RespHeader().Set("Link", fmt.Sprintf("<%s>; rel=\"canonical\"",
 						util.URLJoin(setting.AppURL, strings.Replace(ctx.Req.URL.RequestURI(), util.PathEscapeSegments(refName), url.PathEscape(ctx.Repo.Commit.ID.String()), 1))))
 				}