Fix unclear `IsRepositoryExist` logic (#24374)

There was only one `IsRepositoryExist` function, it did: `has && isDir`

However it's not right, and it would cause 500 error when creating a new
repository if the dir exists.

Then, it was changed to `has || isDir`, it is still incorrect, it
affects the "adopt repo" logic.

To make the logic clear:

* IsRepositoryModelOrDirExist
* IsRepositoryModelExist

8 files changed, 20 insertions, 16 deletions

diff --git a/models/repo/repo.go b/models/repo/repo.go
index f9de6d493d..2e8c28cbb3 100644
--- a/models/repo/repo.go
+++ b/models/repo/repo.go
@@ -726,12 +726,9 @@ func GetRepositoriesMapByIDs(ids []int64) (map[int64]*Repository, error) {
 	return repos, db.GetEngine(db.DefaultContext).In("id", ids).Find(&repos)
 }
 
-// IsRepositoryExist returns true if the repository with given name under user has already existed.
-func IsRepositoryExist(ctx context.Context, u *user_model.User, repoName string) (bool, error) {
-	has, err := db.GetEngine(ctx).Get(&Repository{
-		OwnerID:   u.ID,
-		LowerName: strings.ToLower(repoName),
-	})
+// IsRepositoryModelOrDirExist returns true if the repository with given name under user has already existed.
+func IsRepositoryModelOrDirExist(ctx context.Context, u *user_model.User, repoName string) (bool, error) {
+	has, err := IsRepositoryModelExist(ctx, u, repoName)
 	if err != nil {
 		return false, err
 	}
@@ -739,6 +736,13 @@ func IsRepositoryExist(ctx context.Context, u *user_model.User, repoName string)
 	return has || isDir, err
 }
 
+func IsRepositoryModelExist(ctx context.Context, u *user_model.User, repoName string) (bool, error) {
+	return db.GetEngine(ctx).Get(&Repository{
+		OwnerID:   u.ID,
+		LowerName: strings.ToLower(repoName),
+	})
+}
+
 // GetTemplateRepo populates repo.TemplateRepo for a generated repository and
 // returns an error on failure (NOTE: no error is returned for
 // non-generated repositories, and TemplateRepo will be left untouched)
diff --git a/models/repo/update.go b/models/repo/update.go
index f4cb67bb8f..4894e0a1b9 100644
--- a/models/repo/update.go
+++ b/models/repo/update.go
@@ -116,7 +116,7 @@ func CheckCreateRepository(doer, u *user_model.User, name string, overwriteOrAdo
 		return err
 	}
 
-	has, err := IsRepositoryExist(db.DefaultContext, u, name)
+	has, err := IsRepositoryModelOrDirExist(db.DefaultContext, u, name)
 	if err != nil {
 		return fmt.Errorf("IsRepositoryExist: %w", err)
 	} else if has {
@@ -147,7 +147,7 @@ func ChangeRepositoryName(doer *user_model.User, repo *Repository, newRepoName s
 		return err
 	}
 
-	has, err := IsRepositoryExist(db.DefaultContext, repo.Owner, newRepoName)
+	has, err := IsRepositoryModelOrDirExist(db.DefaultContext, repo.Owner, newRepoName)
 	if err != nil {
 		return fmt.Errorf("IsRepositoryExist: %w", err)
 	} else if has {
diff --git a/models/repo_transfer.go b/models/repo_transfer.go
index 27a77f9b8c..1c873cec57 100644
--- a/models/repo_transfer.go
+++ b/models/repo_transfer.go
@@ -172,7 +172,7 @@ func CreatePendingRepositoryTransfer(ctx context.Context, doer, newOwner *user_m
 		}
 
 		// Check if new owner has repository with same name.
-		if has, err := repo_model.IsRepositoryExist(ctx, newOwner, repo.Name); err != nil {
+		if has, err := repo_model.IsRepositoryModelExist(ctx, newOwner, repo.Name); err != nil {
 			return fmt.Errorf("IsRepositoryExist: %w", err)
 		} else if has {
 			return repo_model.ErrRepoAlreadyExist{
@@ -249,7 +249,7 @@ func TransferOwnership(doer *user_model.User, newOwnerName string, repo *repo_mo
 	newOwnerName = newOwner.Name // ensure capitalisation matches
 
 	// Check if new owner has repository with same name.
-	if has, err := repo_model.IsRepositoryExist(ctx, newOwner, repo.Name); err != nil {
+	if has, err := repo_model.IsRepositoryModelOrDirExist(ctx, newOwner, repo.Name); err != nil {
 		return fmt.Errorf("IsRepositoryExist: %w", err)
 	} else if has {
 		return repo_model.ErrRepoAlreadyExist{
diff --git a/modules/repository/create.go b/modules/repository/create.go
index c1395242c5..e1f0bdcdf9 100644
--- a/modules/repository/create.go
+++ b/modules/repository/create.go
@@ -35,7 +35,7 @@ func CreateRepositoryByExample(ctx context.Context, doer, u *user_model.User, re
 		return err
 	}
 
-	has, err := repo_model.IsRepositoryExist(ctx, u, repo.Name)
+	has, err := repo_model.IsRepositoryModelExist(ctx, u, repo.Name)
 	if err != nil {
 		return fmt.Errorf("IsRepositoryExist: %w", err)
 	} else if has {
diff --git a/routers/api/v1/admin/adopt.go b/routers/api/v1/admin/adopt.go
index 47fd0ef3c3..ccd8be9171 100644
--- a/routers/api/v1/admin/adopt.go
+++ b/routers/api/v1/admin/adopt.go
@@ -95,7 +95,7 @@ func AdoptRepository(ctx *context.APIContext) {
 	}
 
 	// check not a repo
-	has, err := repo_model.IsRepositoryExist(ctx, ctxUser, repoName)
+	has, err := repo_model.IsRepositoryModelExist(ctx, ctxUser, repoName)
 	if err != nil {
 		ctx.InternalServerError(err)
 		return
@@ -157,7 +157,7 @@ func DeleteUnadoptedRepository(ctx *context.APIContext) {
 	}
 
 	// check not a repo
-	has, err := repo_model.IsRepositoryExist(ctx, ctxUser, repoName)
+	has, err := repo_model.IsRepositoryModelExist(ctx, ctxUser, repoName)
 	if err != nil {
 		ctx.InternalServerError(err)
 		return
diff --git a/routers/web/admin/repos.go b/routers/web/admin/repos.go
index b22546f749..9a0e467b48 100644
--- a/routers/web/admin/repos.go
+++ b/routers/web/admin/repos.go
@@ -133,7 +133,7 @@ func AdoptOrDeleteRepository(ctx *context.Context) {
 	repoName := dirSplit[1]
 
 	// check not a repo
-	has, err := repo_model.IsRepositoryExist(ctx, ctxUser, repoName)
+	has, err := repo_model.IsRepositoryModelExist(ctx, ctxUser, repoName)
 	if err != nil {
 		ctx.ServerError("IsRepositoryExist", err)
 		return
diff --git a/routers/web/user/setting/adopt.go b/routers/web/user/setting/adopt.go
index c9995e7278..01668c3954 100644
--- a/routers/web/user/setting/adopt.go
+++ b/routers/web/user/setting/adopt.go
@@ -31,7 +31,7 @@ func AdoptOrDeleteRepository(ctx *context.Context) {
 	root := user_model.UserPath(ctxUser.LowerName)
 
 	// check not a repo
-	has, err := repo_model.IsRepositoryExist(ctx, ctxUser, dir)
+	has, err := repo_model.IsRepositoryModelExist(ctx, ctxUser, dir)
 	if err != nil {
 		ctx.ServerError("IsRepositoryExist", err)
 		return
diff --git a/services/repository/adopt.go b/services/repository/adopt.go
index 94b2c3f3d5..55e77a78a7 100644
--- a/services/repository/adopt.go
+++ b/services/repository/adopt.go
@@ -206,7 +206,7 @@ func DeleteUnadoptedRepository(ctx context.Context, doer, u *user_model.User, re
 		}
 	}
 
-	if exist, err := repo_model.IsRepositoryExist(ctx, u, repoName); err != nil {
+	if exist, err := repo_model.IsRepositoryModelExist(ctx, u, repoName); err != nil {
 		return err
 	} else if exist {
 		return repo_model.ErrRepoAlreadyExist{