With the previous commit, there are no more invocations of
create_branch() that do not create a branch because:
* BRANCH_TRACK_OVERRIDE is no longer passed
* clobber_head_ok = true and force = false is never passed
Assert these situations, delete dead code and ensure that we're handling
clobber_head_ok and force correctly by introducing tests for `git branch
--force`. As a result, create_branch() now always creates a branch.
Helped-by: Jonathan Tan <jonathantanmy@xxxxxxxxxx>
Signed-off-by: Glen Choo <chooglen@xxxxxxxxxx>
---
branch.c | 57 ++++++++++++++++++++++-------------------------
branch.h | 4 ++--
t/t3200-branch.sh | 17 ++++++++++++++
3 files changed, 46 insertions(+), 32 deletions(-)
diff --git a/branch.c b/branch.c
index f3a31930fb..df24021f27 100644
--- a/branch.c
+++ b/branch.c
@@ -429,15 +429,19 @@ void create_branch(struct repository *r,
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 (track == BRANCH_TRACK_OVERRIDE)
+ BUG("'track' cannot be BRANCH_TRACK_OVERRIDE. Did you mean to call dwim_and_setup_tracking()?");
+ 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);
@@ -445,27 +449,20 @@ void create_branch(struct repository *r,
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 a74b2e06a1..9157382ad0 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
