fix

models/git/branch.go

@@ -13,10 +13,12 @@ import (
 	user_model "code.gitea.io/gitea/models/user"
 	"code.gitea.io/gitea/modules/git"
 	"code.gitea.io/gitea/modules/log"
+	"code.gitea.io/gitea/modules/setting"
 	"code.gitea.io/gitea/modules/timeutil"
 	"code.gitea.io/gitea/modules/util"
 
 	"xorm.io/builder"
+	"xorm.io/xorm/schemas"
 )
 
 // ErrBranchNotExist represents an error that branch with such name does not exist.
@@ -103,7 +105,7 @@ func (err ErrBranchesEqual) Unwrap() error {
 type Branch struct {
 	ID            int64
 	RepoID        int64  `xorm:"UNIQUE(s)"`
-	Name          string `xorm:"UNIQUE(s) NOT NULL"` // git's ref-name is case-sensitive internally, however, in some databases (mssql, mysql, by default), it's case-insensitive at the moment
+	Name          string `xorm:"UNIQUE(s) NOT NULL"`
 	CommitID      string
 	CommitMessage string `xorm:"TEXT"` // it only stores the message summary (the first line)
 	PusherID      int64
@@ -117,6 +119,20 @@ type Branch struct {
 	UpdatedUnix   timeutil.TimeStamp `xorm:"updated"`
 }
 
+// TableCollations is to make the "name" column case-sensitve for MySQL/MSSQL
+func (b *Branch) TableCollations() []*schemas.Collation {
+	if setting.Database.Type.IsMySQL() {
+		return []*schemas.Collation{
+			{Column: "name", Name: "utf8mb4_bin"},
+		}
+	} else if setting.Database.Type.IsMSSQL() {
+		return []*schemas.Collation{
+			{Column: "name", Name: "Latin1_General_CS_AS"},
+		}
+	}
+	return nil
+}
+
 func (b *Branch) LoadDeletedBy(ctx context.Context) (err error) {
 	if b.DeletedBy == nil {
 		b.DeletedBy, err = user_model.GetUserByID(ctx, b.DeletedByID)
@@ -380,7 +396,11 @@ func RenameBranch(ctx context.Context, repo *repo_model.Repository, from, to str
 // except the indicate branch
 func FindRecentlyPushedNewBranches(ctx context.Context, repoID, userID int64, excludeBranchName string) (BranchList, error) {
 	branches := make(BranchList, 0, 2)
-	subQuery := builder.Select("head_branch").From("pull_request").
+	sqlHeadBranch := "head_branch"
+	if setting.Database.Type.IsMSSQL() {
+		sqlHeadBranch = "CAST(head_branch AS nvarchar(255)) COLLATE Latin1_General_CS_AS" // FIXME: a dirty hack for MSSQL collation
+	}
+	subQuery := builder.Select(sqlHeadBranch).From("pull_request").
 		InnerJoin("issue", "issue.id = pull_request.issue_id").
 		Where(builder.Eq{
 			"pull_request.head_repo_id": repoID,

models/migrations/migrations.go

@@ -552,6 +552,8 @@ var migrations = []Migration{
 	NewMigration("Add Index to pull_auto_merge.doer_id", v1_22.AddIndexToPullAutoMergeDoerID),
 	// v283 -> v284
 	NewMigration("Add combined Index to issue_user.uid and issue_id", v1_22.AddCombinedIndexToIssueUser),
+	// v284 -> v285
+	NewMigration("Alter branch name collation to be case-sensitive", v1_22.AlterBranchNameCollation),
 }
 
 // GetCurrentDBVersion returns the current db version

models/migrations/v1_22/v283_test.go

@@ -7,22 +7,22 @@ import (
 	"testing"
 
 	"code.gitea.io/gitea/models/migrations/base"
+
+	"github.com/stretchr/testify/assert"
 )
 
 func Test_AddCombinedIndexToIssueUser(t *testing.T) {
 	type IssueUser struct {
-		UID     int64 `xorm:"INDEX unique(uid_to_issue)"` // User ID.
-		IssueID int64 `xorm:"INDEX unique(uid_to_issue)"`
+		ID          int64 `xorm:"pk autoincr"`
+		UID         int64 `xorm:"INDEX"` // User ID.
+		IssueID     int64 `xorm:"INDEX"`
+		IsRead      bool
+		IsMentioned bool
 	}
 
 	// Prepare and load the testing database
 	x, deferable := base.PrepareTestEnv(t, 0, new(IssueUser))
 	defer deferable()
-	if x == nil || t.Failed() {
-		return
-	}
 
-	if err := AddCombinedIndexToIssueUser(x); err != nil {
-		t.Fatal(err)
-	}
+	assert.NoError(t, AddCombinedIndexToIssueUser(x))
 }

models/migrations/v1_22/v284.go

@@ -0,0 +1,29 @@
+// Copyright 2023 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package v1_22 //nolint
+
+import (
+	"code.gitea.io/gitea/modules/log"
+	"code.gitea.io/gitea/modules/setting"
+
+	"xorm.io/xorm"
+)
+
+func AlterBranchNameCollation(x *xorm.Engine) error {
+	if setting.Database.Type.IsMySQL() {
+		_, err := x.Exec("ALTER TABLE branch MODIFY COLUMN `name` VARCHAR(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_bin NOT NULL")
+		return err
+	} else if setting.Database.Type.IsMSSQL() {
+		if _, err := x.Exec("DROP INDEX UQE_branch_s ON branch"); err != nil {
+			log.Error("Failed to drop index UQE_branch_s on branch: %v", err) // ignore this error, in case the index has been dropped in previous migration
+		}
+		if _, err := x.Exec("ALTER TABLE branch ALTER COLUMN [name] nvarchar(255) COLLATE Latin1_General_CS_AS NOT NULL"); err != nil {
+			return err
+		}
+		if _, err := x.Exec("CREATE UNIQUE NONCLUSTERED INDEX UQE_branch_s ON branch (repo_id ASC, [name] ASC)"); err != nil {
+			return err
+		}
+	}
+	return nil
+}

models/migrations/v1_22/v284_test.go

@@ -0,0 +1,25 @@
+// Copyright 2023 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package v1_22 //nolint
+
+import (
+	"testing"
+
+	"code.gitea.io/gitea/models/migrations/base"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestAlterBranchNameCollation(t *testing.T) {
+	type Branch struct {
+		ID     int64
+		RepoID int64  `xorm:"UNIQUE(s)"`
+		Name   string `xorm:"UNIQUE(s) NOT NULL"`
+	}
+
+	x, deferable := base.PrepareTestEnv(t, 0, new(Branch))
+	defer deferable()
+
+	assert.NoError(t, AlterBranchNameCollation(x))
+}

tests/integration/api_branch_test.go

@@ -142,6 +142,18 @@ func testAPICreateBranches(t *testing.T, giteaURL *url.URL) {
 			NewBranch:          "branch_2",
 			ExpectedHTTPStatus: http.StatusCreated,
 		},
+		// Trying to create a case-sensitive branch name
+		{
+			OldBranch:          "new_branch_from_master_1",
+			NewBranch:          "Branch_2",
+			ExpectedHTTPStatus: http.StatusCreated,
+		},
+		// Trying to create a branch with UTF8
+		{
+			OldBranch:          "master",
+			NewBranch:          "test-👀",
+			ExpectedHTTPStatus: http.StatusCreated,
+		},
 		// Trying to create from a branch which does not exist
 		{
 			OldBranch:          "does_not_exist",