$ git clone -n https://src.fedoraproject.org/rpms/mold.git /var/lib/mock/f40-build-59140567-6571250/root/chroot_tmpdir/scmroot/mold
Cloning into '/var/lib/mock/f40-build-59140567-6571250/root/chroot_tmpdir/scmroot/mold'...
$ git fetch origin 53b309be446ebf42d08af802b7bb0d4c8ad74922:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mold
 * [new ref]         53b309be446ebf42d08af802b7bb0d4c8ad74922 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 53b309b Update to 2.38.0 (#2362506)