Jonathan Nieder <jrnieder@xxxxxxxxx> writes:
> Sverre Rabbelier wrote:
>
>> Now _that_ is an excellent usability improvement, assuming we want to
>> encourage detaching HEAD... do we?
>
> Yes.
>
> -- 8<
> Subject: commit: document --detach synonym for "git checkout foo^{commit}"
>
> For example, one might use this when making a temporary merge to test
> that two topics work well together.
>
> This patch just documents the option. It is not meant for application
> without an implementation and tests for the option.
On top of v1.7.3.5-1-g0cb6ad3 (uk/checkout-ambiguous-ref)...
builtin/checkout.c | 12 +++++++++---
1 files changed, 9 insertions(+), 3 deletions(-)
diff --git a/builtin/checkout.c b/builtin/checkout.c
index 953abdd..141f6a3 100644
--- a/builtin/checkout.c
+++ b/builtin/checkout.c
@@ -685,6 +685,7 @@ int cmd_checkout(int argc, const char **argv, const char *prefix)
char *conflict_style = NULL;
int patch_mode = 0;
int dwim_new_local_branch = 1;
+ int force_detach = 0;
struct option options[] = {
OPT__QUIET(&opts.quiet),
OPT_STRING('b', NULL, &opts.new_branch, "branch",
@@ -692,6 +693,7 @@ int cmd_checkout(int argc, const char **argv, const char *prefix)
OPT_STRING('B', NULL, &opts.new_branch_force, "branch",
"create/reset and checkout a branch"),
OPT_BOOLEAN('l', NULL, &opts.new_branch_log, "create reflog for new branch"),
+ OPT_BOOLEAN(0, "detach", &force_detach, "detach the HEAD at named commit"),
OPT_SET_INT('t', "track", &opts.track, "set upstream info for new branch",
BRANCH_TRACK_EXPLICIT),
OPT_STRING(0, "orphan", &opts.new_orphan_branch, "new branch", "new unparented branch"),
@@ -726,6 +728,9 @@ int cmd_checkout(int argc, const char **argv, const char *prefix)
if (opts.new_branch && opts.new_branch_force)
die("-B cannot be used with -b");
+ if ((opts.new_branch || opts.new_orphan_branch) && force_detach)
+ die("--detach cannot be used with -b/-B/--orphan");
+
/* copy -B over to -b, so that we can just check the latter */
if (opts.new_branch_force)
opts.new_branch = opts.new_branch_force;
@@ -834,7 +839,8 @@ int cmd_checkout(int argc, const char **argv, const char *prefix)
new.name = arg;
setup_branch_path(&new);
- if (check_ref_format(new.path) == CHECK_REF_FORMAT_OK &&
+ if (!force_detach &&
+ check_ref_format(new.path) == CHECK_REF_FORMAT_OK &&
resolve_ref(new.path, branch_rev, 1, NULL))
hashcpy(rev, branch_rev);
else
--
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