Re: [PATCH 5/5] fast-import: stop using lock_ref_sha1

> We can use lock_any_ref_for_update instead. Besides being
> more flexible, the only difference between the two is that
> lock_ref_sha1 does not allow "top-level" refs like
> "refs/foo" to be updated. However, we know that we do not
> have such a ref, because we explicitly add the "tags/"
> prefix ourselves.
>
> Note that we now must feed the whole name "refs/tags/X"
> instead of just "tags/X" to the function. As a result, our
> failure error message is uses the longer name. This is
> probably a good thing, though.
>
> As an interesting side note, if we forgot to switch this
> input to the function, the tests do not currently catch it.
> We import a tag "X" and then check that we can access it at
> "tags/X". If we accidentally created "tags/X" at the
> top-level $GIT_DIR instead of under "refs/", we would still
> find it due to our ref lookup procedure!
>
> We do not make such a mistake in this patch, of course, but
> while we're thinking about it, let's make the fast-import
> tests more robust by checking for fully qualified
> refnames.
>
> Signed-off-by: Jeff King <peff@peff.net>
> ---
> As I mentioned, I'd be OK with dropping this one in favor of just
> waiting for Ronnie's transaction patches to graduate.
>
>  fast-import.c          | 4 ++--
>  t/t9300-fast-import.sh | 8 ++++----
>  2 files changed, 6 insertions(+), 6 deletions(-)
>
> diff --git a/fast-import.c b/fast-import.c
> index a1479e9..04a85a4 100644
> --- a/fast-import.c
> +++ b/fast-import.c
> @@ -1738,8 +1738,8 @@ static void dump_tags(void)
>
>         for (t = first_tag; t; t = t->next_tag) {
>                 strbuf_reset(&ref_name);
> -               strbuf_addf(&ref_name, "tags/%s", t->name);
> -               lock = lock_ref_sha1(ref_name.buf, NULL);
> +               strbuf_addf(&ref_name, "refs/tags/%s", t->name);
> +               lock = lock_any_ref_for_update(ref_name.buf, NULL, 0, NULL);
>                 if (!lock || write_ref_sha1(lock, t->sha1, msg) < 0)
>                         failure |= error("Unable to update %s", ref_name.buf);
>         }
> diff --git a/t/t9300-fast-import.sh b/t/t9300-fast-import.sh
> index 5fc9ef2..f4c6673 100755
> --- a/t/t9300-fast-import.sh
> +++ b/t/t9300-fast-import.sh
> @@ -153,7 +153,7 @@ tag series-A
>  An annotated tag without a tagger
>  EOF
>  test_expect_success 'A: verify tag/series-A' '
> -       git cat-file tag tags/series-A >actual &&
> +       git cat-file tag refs/tags/series-A >actual &&
>         test_cmp expect actual
>  '
>
> @@ -165,7 +165,7 @@ tag series-A-blob
>  An annotated tag that annotates a blob.
>  EOF
>  test_expect_success 'A: verify tag/series-A-blob' '
> -       git cat-file tag tags/series-A-blob >actual &&
> +       git cat-file tag refs/tags/series-A-blob >actual &&
>         test_cmp expect actual
>  '
>
> @@ -232,8 +232,8 @@ EOF
>  test_expect_success \
>         'A: tag blob by sha1' \
>         'git fast-import <input &&
> -       git cat-file tag tags/series-A-blob-2 >actual &&
> -       git cat-file tag tags/series-A-blob-3 >>actual &&
> +       git cat-file tag refs/tags/series-A-blob-2 >actual &&
> +       git cat-file tag refs/tags/series-A-blob-3 >>actual &&
>         test_cmp expect actual'
>
>  test_tick
> --
> 2.1.0.346.ga0367b9