branch_get() can return NULL (so far on detached HEAD only) but some
code paths in builtin/branch.c cannot deal with that and cause
segfaults. While at there, make sure we bail out when the user gives 2
or more arguments, but we only process the first one and silently
ignore the rest.
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@xxxxxxxxx>
---
On Fri, Feb 22, 2013 at 12:47 AM, Junio C Hamano <gitster@xxxxxxxxx> wrote:
> Nguyễn Thái Ngọc Duy <pclouds@xxxxxxxxx> writes:
>
>> branch_get() can return NULL (so far on detached HEAD only)...
>
> Do you anticipate any other cases where the API call should validly
> return NULL?
No. But I do not see any guarantee that it may never do that in
future either. Which is why I was deliberately vague with "could not
figure out...". But you also correctly observed my laziness there. So
how about this? It makes a special case for HEAD but not insist on
detached HEAD as the only cause.
builtin/branch.c | 24 ++++++++++++++++++++++++
t/t3200-branch.sh | 21 +++++++++++++++++++++
2 files changed, 45 insertions(+)
diff --git a/builtin/branch.c b/builtin/branch.c
index 6371bf9..82ed337 100644
--- a/builtin/branch.c
+++ b/builtin/branch.c
@@ -889,6 +889,15 @@ int cmd_branch(int argc, const char **argv, const char *prefix)
} else if (new_upstream) {
struct branch *branch = branch_get(argv[0]);
+ if (argc > 1)
+ die(_("too many branches to set new upstream"));
+
+ if (!branch) {
+ if (!argc || !strcmp(argv[0], "HEAD"))
+ die(_("HEAD does not point to any branch. Is it detached?"));
+ die(_("no such branch '%s'"), argv[0]);
+ }
+
if (!ref_exists(branch->refname))
die(_("branch '%s' does not exist"), branch->name);
@@ -901,6 +910,15 @@ int cmd_branch(int argc, const char **argv, const char *prefix)
struct branch *branch = branch_get(argv[0]);
struct strbuf buf = STRBUF_INIT;
+ if (argc > 1)
+ die(_("too many branches to unset upstream"));
+
+ if (!branch) {
+ if (!argc || !strcmp(argv[0], "HEAD"))
+ die(_("HEAD does not point to any branch. Is it detached?"));
+ die(_("no such branch '%s'"), argv[0]);
+ }
+
if (!branch_has_merge_config(branch)) {
die(_("Branch '%s' has no upstream information"), branch->name);
}
@@ -916,6 +934,12 @@ int cmd_branch(int argc, const char **argv, const char *prefix)
int branch_existed = 0, remote_tracking = 0;
struct strbuf buf = STRBUF_INIT;
+ if (!strcmp(argv[0], "HEAD"))
+ die(_("it does not make sense to create 'HEAD' manually"));
+
+ if (!branch)
+ die(_("no such branch '%s'"), argv[0]);
+
if (kinds != REF_LOCAL_BRANCH)
die(_("-a and -r options to 'git branch' do not make sense with a branch name"));
diff --git a/t/t3200-branch.sh b/t/t3200-branch.sh
index f3e0e4a..12f1e4a 100755
--- a/t/t3200-branch.sh
+++ b/t/t3200-branch.sh
@@ -42,6 +42,10 @@ 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'
+test_expect_success \
+ 'git branch HEAD should fail' \
+ 'test_must_fail git branch HEAD'
+
cat >expect <<EOF
$_z40 $HEAD $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> 1117150200 +0000 branch: Created from master
EOF
@@ -388,6 +392,14 @@ test_expect_success \
'git tag foobar &&
test_must_fail git branch --track my11 foobar'
+test_expect_success '--set-upstream-to fails on multiple branches' \
+ 'test_must_fail git branch --set-upstream-to master a b c'
+
+test_expect_success '--set-upstream-to fails on detached HEAD' \
+ 'git checkout HEAD^{} &&
+ test_must_fail git branch --set-upstream-to master &&
+ git checkout -'
+
test_expect_success 'use --set-upstream-to modify HEAD' \
'test_config branch.master.remote foo &&
test_config branch.master.merge foo &&
@@ -417,6 +429,15 @@ test_expect_success 'test --unset-upstream on HEAD' \
test_must_fail git branch --unset-upstream
'
+test_expect_success '--unset-upstream should fail on multiple branches' \
+ 'test_must_fail git branch --unset-upstream a b c'
+
+test_expect_success '--unset-upstream should fail on detached HEAD' \
+ 'git checkout HEAD^{} &&
+ test_must_fail git branch --unset-upstream &&
+ git checkout -
+'
+
test_expect_success 'test --unset-upstream on a particular branch' \
'git branch my15
git branch --set-upstream-to master my14 &&
--
1.8.1.2.536.gf441e6d
--
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