Junio C Hamano <gitster@xxxxxxxxx> writes:
> Samuel Williams <space.ship.traveller@xxxxxxxxx> writes:
>
>> I would expect if you push to an empty repo, it would update it
>> (because denyCurrentBranch = updateInstead).
>
> Good finding.
>
> I think the current implementation of updateInstead is set up to
> bootstrap from an empty repository but only supports incremental
> updates once the receiving repository and its working tree gets set
> up. But I do not think it was a conscious design decison to forbid
> bootstrapping an empty repository, but was a mere gap in the
> implementation. At least, I do not think of a reason why we should
> forbid it (and I am Cc'ing Dscho to confirm).
>
> Fixing it should not be too hard, but I am on a bus right now so...
A fix (or is it an enhancement) would probably look like this.
This is a tangent but I think we should unify the "do we already
have history behind HEAD, or is the current branch still unborn"
test done by various commands and tighten it. As a quick and dirty
hack, I just mimicked what builtin/merge.c seems to do, but this
would tell a detached HEAD that points at a nonsense object name
(i.e. "abcde" not a full 40-hex) as "unborn", where we would be
better off stopping the operation instead of making the repository
breakage worse by doing further damage.
I originally suspected I'd need to fix the push_to_checkout()
codepath, too, but it turns out that the detection of unborn-ness
of the current branch is also outsourced to the push-to-checkout
hook, so I do not have to do anything special ;-)
builtin/receive-pack.c | 14 +++++++++++++-
1 file changed, 13 insertions(+), 1 deletion(-)
diff --git a/builtin/receive-pack.c b/builtin/receive-pack.c
index fc8ec9c..758b0b3 100644
--- a/builtin/receive-pack.c
+++ b/builtin/receive-pack.c
@@ -733,6 +733,13 @@ static int update_shallow_ref(struct command *cmd, struct shallow_info *si)
return 0;
}
+static int head_has_history(void)
+{
+ unsigned char sha1[20];
+
+ return !get_sha1("HEAD", sha1);
+}
+
static const char *push_to_deploy(unsigned char *sha1,
struct argv_array *env,
const char *work_tree)
@@ -745,13 +752,15 @@ static const char *push_to_deploy(unsigned char *sha1,
};
const char *diff_index[] = {
"diff-index", "--quiet", "--cached", "--ignore-submodules",
- "HEAD", "--", NULL
+ NULL, "--", NULL
};
const char *read_tree[] = {
"read-tree", "-u", "-m", NULL, NULL
};
struct child_process child = CHILD_PROCESS_INIT;
+ int empty = !head_has_history();
+
child.argv = update_refresh;
child.env = env->argv;
child.dir = work_tree;
@@ -772,6 +781,9 @@ static const char *push_to_deploy(unsigned char *sha1,
if (run_command(&child))
return "Working directory has unstaged changes";
+ /* diff-index with either HEAD or an empty tree */
+ diff_index[4] = empty ? EMPTY_TREE_SHA1_HEX : "HEAD";
+
child_process_init(&child);
child.argv = diff_index;
child.env = env->argv;
--
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