[PATCH] clone: handle unborn branch in bare repos
- From
Jeff King <peff@peff.net>
- Date
- Sep 20, 2021, 19:04 UTC
- Message-ID
- <YUjbKt0Hw0ieHcaN@coredump.intra.peff.net>
When cloning a repository with an unborn HEAD, we'll set the local HEAD to match it only if the local repository is non-bare. This is inconsistent with all other combinations:
remote HEAD | local repo | local HEAD ----------------------------------------------- points to commit | non-bare | same as remote points to commit | bare | same as remote unborn | non-bare | same as remote unborn | bare | local default
So I don't think this is some clever or subtle behavior, but just a bug in 4f37d45706 (clone: respect remote unborn HEAD, 2021-02-05). And it's easy to see how we ended up there. Before that commit, the code to set up the HEAD for an empty repo was guarded by "if (!option_bare)". That's because the only thing it did was call install_branch_config(), and we don't want to do so for a bare repository (unborn HEAD or not).
That commit put the handling of unborn HEADs into the same block, since those also need to call install_branch_config(). But the unborn case has an additional side effect of calling create_symref(), and we want that to happen whether we are bare or not.
This patch just pulls all of the "figure out the default branch" code out of the "!option_bare" block. Only the actual config installation is kept there.
Note that this does mean we might allocate "ref" and not use it (if the remote is empty but did not advertise an unborn HEAD). But that's not really a big deal since this isn't a hot code path, and it keeps the code simple. The alternative would be handling unborn_head_target separately, but that gets confusing since its memory ownership is tangled up with the "ref" variable.
There's just one new test, for the case we're fixing. The other ones in the table are handled elsewhere (the unborn non-bare case just above, and the actually-born cases in t5601, t5606, and t5609, as they do not require v2's "unborn" protocol extension).
Signed-off-by: Jeff King <peff@peff.net> --- There's a big reindented chunk here. Viewing the diff with "-w" or "--color-moved-ws=ignore-space-change" makes it a lot easier to read.
I'm not opposed to reorganizing the code to get rid of the sometimes-useless malloc. But I'd prefer to do it on top to keep this functional change more obviously-correct.
builtin/clone.c | 33 +++++++++++++++++---------------- t/t5702-protocol-v2.sh | 13 +++++++++++++ 2 files changed, 30 insertions(+), 16 deletions(-)
diff --git a/builtin/clone.c b/builtin/clone.c index b93bcd460e..6e821d6326 100644 --- a/builtin/clone.c +++ b/builtin/clone.c @@ -1345,6 +1345,9 @@ int cmd_clone(int argc, const char **argv, const char *prefix) our_head_points_at = remote_head_points_at; } else { + const char *branch; + char *ref; + if (option_branch) die(_("Remote branch %s not found in upstream %s"), option_branch, remote_name); @@ -1355,24 +1358,22 @@ int cmd_clone(int argc, const char **argv, const char *prefix) remote_head_points_at = NULL; remote_head = NULL; option_no_checkout = 1; - if (!option_bare) { - const char *branch; - char *ref; - - if (transport_ls_refs_options.unborn_head_target && - skip_prefix(transport_ls_refs_options.unborn_head_target, - "refs/heads/", &branch)) { - ref = transport_ls_refs_options.unborn_head_target; - transport_ls_refs_options.unborn_head_target = NULL; - create_symref("HEAD", ref, reflog_msg.buf); - } else { - branch = git_default_branch_name(0); - ref = xstrfmt("refs/heads/%s", branch); - } - install_branch_config(0, branch, remote_name, ref); - free(ref); + if (transport_ls_refs_options.unborn_head_target && + skip_prefix(transport_ls_refs_options.unborn_head_target, + "refs/heads/", &branch)) { + ref = transport_ls_refs_options.unborn_head_target; + transport_ls_refs_options.unborn_head_target = NULL; + create_symref("HEAD", ref, reflog_msg.buf); + } else { + branch = git_default_branch_name(0); + ref = xstrfmt("refs/heads/%s", branch); } + + if (!option_bare) + install_branch_config(0, branch, remote_name, ref); + + free(ref); } write_refspec_config(src_ref_prefix, our_head_points_at, diff --git a/t/t5702-protocol-v2.sh b/t/t5702-protocol-v2.sh index d3687b1a2e..d527cf6c49 100755 --- a/t/t5702-protocol-v2.sh +++ b/t/t5702-protocol-v2.sh @@ -237,6 +237,19 @@ test_expect_success '...but not if explicitly forbidden by config' ' ! grep "refs/heads/mydefaultbranch" file_empty_child/.git/HEAD ' +test_expect_success 'bare clone propagates empty default branch' ' + test_when_finished "rm -rf file_empty_parent file_empty_child.git" && + + GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME= \ + git -c init.defaultBranch=mydefaultbranch init file_empty_parent && + + GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME= \ + git -c init.defaultBranch=main -c protocol.version=2 \ + clone --bare \ + "file://$(pwd)/file_empty_parent" file_empty_child.git && + grep "refs/heads/mydefaultbranch" file_empty_child.git/HEAD +' + test_expect_success 'fetch with file:// using protocol v2' ' test_when_finished "rm -f log" &&
-- 2.33.0.992.gccf01040e6