The "--" notation disambiguates files and branches, but as a side-effect
of the previous implementation, also disabled the branch auto-creation
when $branch does not exist.
A possible scenario is then:
git checkout $branch
=> fails if $branch is both a ref and a file, and suggests --
git checkout $branch --
=> refuses to create the $branch
This patch allows the second form to create $branch, and since the -- is
provided, it does not look for file named $branch.
Signed-off-by: Matthieu Moy <Matthieu.Moy@xxxxxxx>
---
Since v1: added a paragraph in the block comment.
builtin/checkout.c | 38 ++++++++++++++++++++++++++++++--------
t/t2024-checkout-dwim.sh | 22 ++++++++++++++++++++++
2 files changed, 52 insertions(+), 8 deletions(-)
diff --git a/builtin/checkout.c b/builtin/checkout.c
index 0f57397..a5a12f6 100644
--- a/builtin/checkout.c
+++ b/builtin/checkout.c
@@ -863,6 +863,14 @@ static const char *unique_tracking_name(const char *name, unsigned char *sha1)
return NULL;
}
+static int error_invalid_ref(const char *arg, int has_dash_dash, int argcount)
+{
+ if (has_dash_dash)
+ die(_("invalid reference: %s"), arg);
+ else
+ return argcount;
+}
+
static int parse_branchname_arg(int argc, const char **argv,
int dwim_new_local_branch_ok,
struct branch_info *new,
@@ -881,6 +889,12 @@ static int parse_branchname_arg(int argc, const char **argv,
* <ref> must be a valid tree, everything after the '--' must be
* a path.
*
+ * A sub-case of (1) is "git checkout <ref> --". In this
+ * case, checkout behaves like case (3), except that it does
+ * not attempt to understand <ref> as a file (hence, the
+ * short-hand to create branch <ref> works even if <ref>
+ * exists as a filename).
+ *
* case 2: git checkout -- [<paths>]
*
* everything after the '--' must be paths.
@@ -916,20 +930,28 @@ static int parse_branchname_arg(int argc, const char **argv,
if (!strcmp(arg, "-"))
arg = "@{-1}";
- if (get_sha1_mb(arg, rev)) {
- if (has_dash_dash) /* case (1) */
- die(_("invalid reference: %s"), arg);
- if (dwim_new_local_branch_ok &&
- !check_filename(NULL, arg) &&
- argc == 1) {
+ if (get_sha1_mb(arg, rev)) { /* case (1)? */
+ int try_dwim = dwim_new_local_branch_ok;
+
+ if (check_filename(NULL, arg) && !has_dash_dash)
+ try_dwim = 0;
+ /*
+ * Accept "git checkout foo" and "git checkout foo --"
+ * as candidates for dwim.
+ */
+ if (!(argc == 1 && !has_dash_dash) &&
+ !(argc == 2 && has_dash_dash))
+ try_dwim = 0;
+
+ if (try_dwim) {
const char *remote = unique_tracking_name(arg, rev);
if (!remote)
- return argcount;
+ return error_invalid_ref(arg, has_dash_dash, argcount);
*new_branch = arg;
arg = remote;
/* DWIMmed to create local branch */
} else {
- return argcount;
+ return error_invalid_ref(arg, has_dash_dash, argcount);
}
}
diff --git a/t/t2024-checkout-dwim.sh b/t/t2024-checkout-dwim.sh
index 094b92e..d9afdb2 100755
--- a/t/t2024-checkout-dwim.sh
+++ b/t/t2024-checkout-dwim.sh
@@ -164,4 +164,26 @@ test_expect_success 'checkout of branch from a single remote succeeds #4' '
test_branch_upstream eggs repo_d eggs
'
+test_expect_success 'checkout of branch with a file having the same name fails' '
+ git checkout -B master &&
+ test_might_fail git branch -D spam &&
+
+ >spam &&
+ test_must_fail git checkout spam &&
+ test_must_fail git checkout spam &&
+ test_must_fail git rev-parse --verify refs/heads/spam &&
+ test_branch master
+'
+
+test_expect_success 'checkout <branch> -- succeeds, even if a file with the same name exists' '
+ git checkout -B master &&
+ test_might_fail git branch -D spam &&
+
+ >spam &&
+ git checkout spam -- &&
+ test_branch spam &&
+ test_cmp_rev refs/remotes/extra_dir/repo_c/extra_dir/spam HEAD &&
+ test_branch_upstream spam repo_c spam
+'
+
test_done
--
1.8.4.474.g128a96c
--
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