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From: Glen Choo <chooglen@google.com>
To: git@vger.kernel.org
Cc: "Glen Choo" <chooglen@google.com>,
	"Jonathan Tan" <jonathantanmy@google.com>,
	"Josh Steadmon" <steadmon@google.com>,
	"Emily Shaffer" <emilyshaffer@google.com>,
	"Ævar Arnfjörð Bjarmason" <avarab@gmail.com>,
	"Philippe Blain" <levraiphilippeblain@gmail.com>,
	"Junio C Hamano" <gitster@pobox.com>
Subject: [PATCH v5 2/5] branch: make create_branch() always create a branch
Date: Thu, 16 Dec 2021 15:33:21 -0800	[thread overview]
Message-ID: <20211216233324.65126-3-chooglen@google.com> (raw)
In-Reply-To: <20211216233324.65126-1-chooglen@google.com>

create_branch() was formerly used to set tracking without creating a
branch. Since the previous commit replaces this use case with
dwim_and_setup_tracking(), we can simplify create_branch() so that it
always creates a branch.

Do this simplification, in particular:

* remove the special handling of BRANCH_TRACK_OVERRIDE because it is no
  longer used
* assert that clobber_head_ok can only be provided with force
* check that we're handling clobber_head_ok and force correctly by
  introducing tests for `git branch --force`

Signed-off-by: Glen Choo <chooglen@google.com>
---
 branch.c          | 55 +++++++++++++++++++++--------------------------
 branch.h          |  4 ++--
 t/t3200-branch.sh | 17 +++++++++++++++
 3 files changed, 44 insertions(+), 32 deletions(-)

diff --git a/branch.c b/branch.c
index 54e989f3c8..6f474a5505 100644
--- a/branch.c
+++ b/branch.c
@@ -426,15 +426,17 @@ void create_branch(struct repository *r, const char *name,
 	char *real_ref;
 	struct strbuf ref = STRBUF_INIT;
 	int forcing = 0;
-	int dont_change_ref = 0;
-
-	if ((track == BRANCH_TRACK_OVERRIDE || clobber_head_ok)
-	    ? validate_branchname(name, &ref)
-	    : validate_new_branchname(name, &ref, force)) {
-		if (!force)
-			dont_change_ref = 1;
-		else
-			forcing = 1;
+	struct ref_transaction *transaction;
+	struct strbuf err = STRBUF_INIT;
+	char *msg;
+
+	if (clobber_head_ok && !force)
+		BUG("'clobber_head_ok' can only be used with 'force'");
+
+	if (clobber_head_ok ?
+			  validate_branchname(name, &ref) :
+			  validate_new_branchname(name, &ref, force)) {
+		forcing = 1;
 	}
 
 	dwim_branch_start(r, start_name, track, &real_ref, &oid);
@@ -442,27 +444,20 @@ void create_branch(struct repository *r, const char *name,
 	if (reflog)
 		log_all_ref_updates = LOG_REFS_NORMAL;
 
-	if (!dont_change_ref) {
-		struct ref_transaction *transaction;
-		struct strbuf err = STRBUF_INIT;
-		char *msg;
-
-		if (forcing)
-			msg = xstrfmt("branch: Reset to %s", start_name);
-		else
-			msg = xstrfmt("branch: Created from %s", start_name);
-
-		transaction = ref_transaction_begin(&err);
-		if (!transaction ||
-		    ref_transaction_update(transaction, ref.buf,
-					   &oid, forcing ? NULL : null_oid(),
-					   0, msg, &err) ||
-		    ref_transaction_commit(transaction, &err))
-			die("%s", err.buf);
-		ref_transaction_free(transaction);
-		strbuf_release(&err);
-		free(msg);
-	}
+	if (forcing)
+		msg = xstrfmt("branch: Reset to %s", start_name);
+	else
+		msg = xstrfmt("branch: Created from %s", start_name);
+	transaction = ref_transaction_begin(&err);
+	if (!transaction ||
+		ref_transaction_update(transaction, ref.buf,
+					&oid, forcing ? NULL : null_oid(),
+					0, msg, &err) ||
+		ref_transaction_commit(transaction, &err))
+		die("%s", err.buf);
+	ref_transaction_free(transaction);
+	strbuf_release(&err);
+	free(msg);
 
 	if (real_ref && track)
 		setup_tracking(ref.buf + 11, real_ref, track, quiet);
diff --git a/branch.h b/branch.h
index ab2315c611..cf3a4d3ff3 100644
--- a/branch.h
+++ b/branch.h
@@ -52,8 +52,8 @@ void dwim_and_setup_tracking(struct repository *r, const char *new_ref,
  *
  *   - force enables overwriting an existing (non-head) branch
  *
- *   - clobber_head_ok allows the currently checked out (hence existing)
- *     branch to be overwritten; without 'force', it has no effect.
+ *   - clobber_head_ok, when enabled with 'force', allows the currently
+ *     checked out (head) branch to be overwritten
  *
  *   - reflog creates a reflog for the branch
  *
diff --git a/t/t3200-branch.sh b/t/t3200-branch.sh
index 1bc3795847..7a0ff75ba8 100755
--- a/t/t3200-branch.sh
+++ b/t/t3200-branch.sh
@@ -42,6 +42,23 @@ test_expect_success 'git branch abc should create a branch' '
 	git branch abc && test_path_is_file .git/refs/heads/abc
 '
 
+test_expect_success 'git branch abc should fail when abc exists' '
+	test_must_fail git branch abc
+'
+
+test_expect_success 'git branch --force abc should fail when abc is checked out' '
+	test_when_finished git switch main &&
+	git switch abc &&
+	test_must_fail git branch --force abc HEAD~1
+'
+
+test_expect_success 'git branch --force abc should succeed when abc exists' '
+	git rev-parse HEAD~1 >expect &&
+	git branch --force abc HEAD~1 &&
+	git rev-parse abc >actual &&
+	test_cmp expect actual
+'
+
 test_expect_success 'git branch a/b/c should create a branch' '
 	git branch a/b/c && test_path_is_file .git/refs/heads/a/b/c
 '
-- 
2.33.GIT


  parent reply	other threads:[~2021-12-16 23:33 UTC|newest]

Thread overview: 110+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-22 22:32 [PATCH 0/4] implement branch --recurse-submodules Glen Choo
2021-11-22 22:32 ` [PATCH 1/4] submodule-config: add submodules_of_tree() helper Glen Choo
2021-11-23  2:12   ` Jonathan Tan
2021-11-23 19:48     ` Glen Choo
2021-11-23 10:53   ` Ævar Arnfjörð Bjarmason
2021-11-23 18:35     ` Glen Choo
2021-11-23 22:46   ` Junio C Hamano
2021-11-22 22:32 ` [PATCH 2/4] branch: refactor out branch validation from create_branch() Glen Choo
2021-11-22 22:32 ` [PATCH 3/4] branch: add --dry-run option to branch Glen Choo
2021-11-23 10:42   ` Ævar Arnfjörð Bjarmason
2021-11-23 18:42     ` Glen Choo
2021-11-23 23:10   ` Jonathan Tan
2021-11-24  0:52     ` Glen Choo
2021-11-22 22:32 ` [PATCH 4/4] branch: add --recurse-submodules option for branch creation Glen Choo
2021-11-23 10:45   ` Ævar Arnfjörð Bjarmason
2021-11-23 18:56     ` Glen Choo
2021-11-23 19:41   ` Philippe Blain
2021-11-23 23:43     ` Glen Choo
2021-11-24  1:31   ` Jonathan Tan
2021-11-24 18:18     ` Glen Choo
2021-11-29 21:01       ` Jonathan Tan
2021-12-06 21:55 ` [PATCH v2 0/3] implement branch --recurse-submodules Glen Choo
2021-12-06 21:55   ` [PATCH v2 1/3] branch: move --set-upstream-to behavior to setup_tracking() Glen Choo
2021-12-06 22:48     ` Junio C Hamano
2021-12-08 18:48       ` Glen Choo
2021-12-06 23:28     ` Junio C Hamano
2021-12-08 17:09       ` Glen Choo
2021-12-06 21:55   ` [PATCH v2 2/3] builtin/branch: clean up action-picking logic in cmd_branch() Glen Choo
2021-12-06 21:55   ` [PATCH v2 3/3] branch: add --recurse-submodules option for branch creation Glen Choo
2021-12-09 18:49   ` [PATCH v3 0/5] implement branch --recurse-submodules Glen Choo
2021-12-09 18:49     ` [PATCH v3 1/5] branch: move --set-upstream-to behavior to setup_tracking() Glen Choo
2021-12-09 21:19       ` Jonathan Tan
2021-12-09 22:16         ` Glen Choo
2021-12-09 18:49     ` [PATCH v3 2/5] branch: remove forward declaration of validate_branch_start() Glen Choo
2021-12-09 18:49     ` [PATCH v3 3/5] builtin/branch: clean up action-picking logic in cmd_branch() Glen Choo
2021-12-09 21:23       ` Jonathan Tan
2021-12-09 21:57         ` Glen Choo
2021-12-09 18:49     ` [PATCH v3 4/5] branch: add --recurse-submodules option for branch creation Glen Choo
2021-12-11 18:08       ` Philippe Blain
2021-12-14 20:08         ` Glen Choo
2021-12-09 18:49     ` [PATCH v3 5/5] branch.c: replace questionable exit() codes Glen Choo
2021-12-10  2:21       ` Ævar Arnfjörð Bjarmason
2021-12-10 17:43         ` Glen Choo
2021-12-13  9:02         ` Junio C Hamano
2021-12-13  9:19           ` Ævar Arnfjörð Bjarmason
2021-12-13 19:26             ` Junio C Hamano
2021-12-09 21:59     ` [PATCH v3 0/5] implement branch --recurse-submodules Jonathan Tan
2021-12-09 22:21       ` Glen Choo
2021-12-13 23:20         ` Jonathan Tan
2021-12-14 18:47           ` Glen Choo
2021-12-16  0:32     ` [PATCH v4 " Glen Choo
2021-12-16  0:32       ` [PATCH v4 1/5] branch: move --set-upstream-to behavior to dwim_and_setup_tracking() Glen Choo
2021-12-16  0:32       ` [PATCH v4 2/5] branch: make create_branch() always create a branch Glen Choo
2021-12-16  0:32       ` [PATCH v4 3/5] branch: add a dry_run parameter to create_branch() Glen Choo
2021-12-16  0:32       ` [PATCH v4 4/5] builtin/branch: clean up action-picking logic in cmd_branch() Glen Choo
2021-12-16  0:32       ` [PATCH v4 5/5] branch: add --recurse-submodules option for branch creation Glen Choo
2021-12-16 23:33       ` [PATCH v5 0/5] implement branch --recurse-submodules Glen Choo
2021-12-16 23:33         ` [PATCH v5 1/5] branch: move --set-upstream-to behavior to dwim_and_setup_tracking() Glen Choo
2021-12-16 23:33         ` Glen Choo [this message]
2021-12-16 23:33         ` [PATCH v5 3/5] branch: add a dry_run parameter to create_branch() Glen Choo
2021-12-16 23:33         ` [PATCH v5 4/5] builtin/branch: clean up action-picking logic in cmd_branch() Glen Choo
2021-12-16 23:33         ` [PATCH v5 5/5] branch: add --recurse-submodules option for branch creation Glen Choo
2021-12-17  0:34         ` [PATCH v5 0/5] implement branch --recurse-submodules Junio C Hamano
2021-12-17  0:45           ` Junio C Hamano
2021-12-20 19:09             ` Glen Choo
2021-12-20 19:50               ` Junio C Hamano
2021-12-20 20:25                 ` Glen Choo
2021-12-20 23:34         ` [PATCH v6 " Glen Choo
2021-12-20 23:34           ` [PATCH v6 1/5] branch: move --set-upstream-to behavior to dwim_and_setup_tracking() Glen Choo
2022-01-11  2:09             ` Jonathan Tan
2022-01-11 17:29               ` Glen Choo
2022-01-11 20:03                 ` Jonathan Tan
2021-12-20 23:34           ` [PATCH v6 2/5] branch: make create_branch() always create a branch Glen Choo
2022-01-11  2:19             ` Jonathan Tan
2022-01-11 17:51               ` Glen Choo
2021-12-20 23:34           ` [PATCH v6 3/5] branch: add a dry_run parameter to create_branch() Glen Choo
2021-12-20 23:34           ` [PATCH v6 4/5] builtin/branch: clean up action-picking logic in cmd_branch() Glen Choo
2021-12-20 23:34           ` [PATCH v6 5/5] branch: add --recurse-submodules option for branch creation Glen Choo
2021-12-26  4:09             ` Junio C Hamano
2022-01-11  3:28             ` Jonathan Tan
2022-01-11 18:11               ` Glen Choo
2022-01-11 20:15                 ` Jonathan Tan
2022-01-11 23:22                   ` Glen Choo
2021-12-20 23:36           ` [PATCH v6 0/5] implement branch --recurse-submodules Glen Choo
2021-12-21  1:07           ` Junio C Hamano
2021-12-21 17:51             ` Glen Choo
2022-01-24 20:44           ` [PATCH v7 0/6] " Glen Choo
2022-01-24 20:44             ` [PATCH v7 1/6] branch: move --set-upstream-to behavior to dwim_and_setup_tracking() Glen Choo
2022-01-24 20:44             ` [PATCH v7 2/6] branch: make create_branch() always create a branch Glen Choo
2022-01-24 20:44             ` [PATCH v7 3/6] branch: add a dry_run parameter to create_branch() Glen Choo
2022-01-24 20:44             ` [PATCH v7 4/6] builtin/branch: consolidate action-picking logic in cmd_branch() Glen Choo
2022-01-24 20:44             ` [PATCH v7 5/6] branch: add --recurse-submodules option for branch creation Glen Choo
2022-01-27 20:29               ` Jonathan Tan
2022-01-27 21:32                 ` Glen Choo
2022-01-27 22:42                   ` Glen Choo
2022-01-24 20:44             ` [PATCH v7 6/6] branch.c: use 'goto cleanup' in setup_tracking() to fix memory leaks Glen Choo
2022-01-27 22:15               ` Junio C Hamano
2022-01-28 19:44                 ` Glen Choo
2022-01-29  0:04             ` [PATCH v8 0/6] implement branch --recurse-submodules Glen Choo
2022-01-29  0:04               ` [PATCH v8 1/6] branch: move --set-upstream-to behavior to dwim_and_setup_tracking() Glen Choo
2022-01-29  0:04               ` [PATCH v8 2/6] branch: make create_branch() always create a branch Glen Choo
2022-02-01 22:20                 ` Junio C Hamano
2022-01-29  0:04               ` [PATCH v8 3/6] branch: add a dry_run parameter to create_branch() Glen Choo
2022-01-29  0:04               ` [PATCH v8 4/6] builtin/branch: consolidate action-picking logic in cmd_branch() Glen Choo
2022-01-29  0:04               ` [PATCH v8 5/6] branch: add --recurse-submodules option for branch creation Glen Choo
2022-02-04  1:10                 ` Glen Choo
2022-02-04 16:15                   ` Junio C Hamano
2022-02-04 18:10                     ` Glen Choo
2022-01-29  0:04               ` [PATCH v8 6/6] branch.c: use 'goto cleanup' in setup_tracking() to fix memory leaks Glen Choo
2022-02-01 17:43               ` [PATCH v8 0/6] implement branch --recurse-submodules Jonathan Tan

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