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remote-curl: don't pass back fake refs

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When receive-pack advertises its list of refs, it generally hides the
capabilities information after a NUL at the end of the first ref.

However, when we have an empty repository, there are no refs, and
therefore receive-pack writes a fake ref "capabilities^{}" with the
capabilities afterwards.

On the client side, git reads the result with get_remote_heads(). We pick
the capabilities from the end of the line, and then call check_ref() to
make sure the ref name is valid. We see that it isn't, and don't bother
adding it to our list of refs.

However, the call to check_ref() is enabled by passing the REF_NORMAL flag
to get_remote_heads. For the regular git transport, we pass REF_NORMAL in
get_refs_via_connect() if we are doing a push (since only receive-pack
uses this fake ref).  But in remote-curl, we never use this flag, and we
accept the fake ref as a real one, passing it back from the helper to the
parent git-push.

Most of the time this bug goes unnoticed, as the fake ref won't match our
refspecs. However, if "--mirror" is used, then we see it as remote cruft
to be pruned, and try to pass along a deletion refspec for it. Of course
this refspec has bogus syntax (because of the ^{}), and the helper
complains, aborting the push.

Let's have remote-curl mirror what the builtin get_refs_via_connect() does
(at least for the case of using git protocol; we can leave the dumb
info/refs reader as it is).

This also fixes pushing with --mirror to a smart-http remote that uses
alternates. The fake ".have" refs the server gives to avoid unnecessary
network transfer has a similar bad interactions with the machinery.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jeff King 2011-12-17 05:45:39 -05:00 committed by Junio C Hamano
parent 7b6c5836cf
commit 02f7914734
2 changed files with 36 additions and 3 deletions
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7
remote-curl.c
View file

@ -188,7 +188,7 @@ static int write_discovery(int in, int out, void *data)
return err;
}
static struct ref *parse_git_refs(struct discovery *heads)
static struct ref *parse_git_refs(struct discovery *heads, int for_push)
{
struct ref *list = NULL;
struct async async;
@ -200,7 +200,8 @@ static struct ref *parse_git_refs(struct discovery *heads)
if (start_async(&async))
die("cannot start thread to parse advertised refs");
get_remote_heads(async.out, &list, 0, NULL, 0, NULL);
get_remote_heads(async.out, &list, 0, NULL,
for_push ? REF_NORMAL : 0, NULL);
close(async.out);
if (finish_async(&async))
die("ref parsing thread failed");
@ -268,7 +269,7 @@ static struct ref *get_refs(int for_push)
heads = discover_refs("git-upload-pack");
if (heads->proto_git)
return parse_git_refs(heads);
return parse_git_refs(heads, for_push);
return parse_info_refs(heads);
}

32
t/t5541-http-push.sh
View file

@ -154,5 +154,37 @@ test_expect_success 'push (chunked)' '
test $HEAD = $(git rev-parse --verify HEAD))
'
test_expect_success 'push --all can push to empty repo' '
d=$HTTPD_DOCUMENT_ROOT_PATH/empty-all.git &&
git init --bare "$d" &&
git --git-dir="$d" config http.receivepack true &&
git push --all "$HTTPD_URL"/smart/empty-all.git
'
test_expect_success 'push --mirror can push to empty repo' '
d=$HTTPD_DOCUMENT_ROOT_PATH/empty-mirror.git &&
git init --bare "$d" &&
git --git-dir="$d" config http.receivepack true &&
git push --mirror "$HTTPD_URL"/smart/empty-mirror.git
'
test_expect_success 'push --all to repo with alternates' '
s=$HTTPD_DOCUMENT_ROOT_PATH/test_repo.git &&
d=$HTTPD_DOCUMENT_ROOT_PATH/alternates-all.git &&
git clone --bare --shared "$s" "$d" &&
git --git-dir="$d" config http.receivepack true &&
git --git-dir="$d" repack -adl &&
git push --all "$HTTPD_URL"/smart/alternates-all.git
'
test_expect_success 'push --mirror to repo with alternates' '
s=$HTTPD_DOCUMENT_ROOT_PATH/test_repo.git &&
d=$HTTPD_DOCUMENT_ROOT_PATH/alternates-mirror.git &&
git clone --bare --shared "$s" "$d" &&
git --git-dir="$d" config http.receivepack true &&
git --git-dir="$d" repack -adl &&
git push --mirror "$HTTPD_URL"/smart/alternates-mirror.git
'
stop_httpd
test_done