tree f81dc6c5a58bed950224e496345d864680045b5a
parent 1536241074d5079e94803c5ef9f8df9a65d995fb
author Xinyu Zhang <xinyu.zhang@arm.com> 1689567982 +0800
committer Xinyu Zhang <xinyu.zhang@arm.com> 1689569697 +0800

git: Checkout to FETCH_HEAD for refspec in "refs/changes" format

REPO_REFSPEC is used for checkout because it is possible to have several
FETCH_HEAD values. For example, when parsing the FETCH_HEAD for
"TF-Mv1.8.0", the commits of "TF-Mv1.8.0-RC1" and "TF-Mv1.8.0-RC2" will
also be added to FETCH_HEAD. So REPO_REFSPEC is used to do the final
checkout to make sure that the commit is exactly expected.

However, when the refspec of unmerged patch is in "refs/changes" format,
REPO_REFSPEC cannot be directly used to checkout. Luckily, the value of
FETCH_HEAD parsed from this kind of refspec is always unique, because
the refspec is consisted of patch number and patchset number. So it is
okay to checkout with FETCH_HEAD when REPO_REFSPEC is in "refs/changes"
format.

Signed-off-by: Xinyu Zhang <xinyu.zhang@arm.com>
Change-Id: I982d9775a9abb5b89c31717a4c85720a0abefe4b