Re: [PATCH 2/2] p9210: fix 'scalar clone' when running from a detached HEAD

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On Fri, Mar 28, 2025 at 05:07:49PM +0000, Philippe Blain via GitGitGadget wrote:
> From: Philippe Blain <levraiphilippeblain@xxxxxxxxx>
> 
> In p9210-scalar-clone.sh, we test using 'scalar clone' to clone
> $GIT_PERF_LARGE_REPO (copied locally as 'to-clone'), which defaults to
> the git.git checkout we are running the test from.
> 
> When --branch is not specified (as in this test), 'scalar clone' tries
> to get the default branch of the remote repository by parsing the output
> of 'git ls-remote --symref $URL HEAD', as implemented in
> scalar.c:remote_default_branch. When the git.git checkout we are running
> the test from is in detached HEAD, this fails and we fall back to using
> the name of the currently checked out branch in the newly initialized
> repository, which in this case is the value returned earlier in
> cmd_clone by repo_default_branch_name.
> 
> We then invoke 'git checkout -t origin/$branch', with $branch being the
> name we got from remote_default_branch. This invocation fails if
> '$branch' does not exist as a branch in the current git.git checkout.
> 
> Fix this by creating a local branch in 'to-clone' in the setup test
> "enable server-side partial clone", making sure to use '-B' in case a
> branch named 'test-branch' already exists.
> 
> Signed-off-by: Philippe Blain <levraiphilippeblain@xxxxxxxxx>
> ---
>  t/perf/p9210-scalar.sh | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/t/perf/p9210-scalar.sh b/t/perf/p9210-scalar.sh
> index 265f7cd1fe2..56b075e906e 100755
> --- a/t/perf/p9210-scalar.sh
> +++ b/t/perf/p9210-scalar.sh
> @@ -7,7 +7,8 @@ test_perf_large_repo "$TRASH_DIRECTORY/to-clone"
>  
>  test_expect_success 'enable server-side partial clone' '
>  	git -C to-clone config uploadpack.allowFilter true &&
> -	git -C to-clone config uploadpack.allowAnySHA1InWant true
> +	git -C to-clone config uploadpack.allowAnySHA1InWant true &&
> +	git -C to-clone checkout -B test-branch
>  '

This feels like an easy and pragmatic fix. Thanks!

Patrick




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