$ git clone -n https://src.fedoraproject.org/rpms/gcc.git /var/lib/mock/f41-build-812310-147787/root/chroot_tmpdir/scmroot/gcc
Cloning into '/var/lib/mock/f41-build-812310-147787/root/chroot_tmpdir/scmroot/gcc'...
$ git fetch origin 73893f69355d52055dd41c7a9241267b019c452d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gcc
 * [new ref]         73893f69355d52055dd41c7a9241267b019c452d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 73893f6 14.1.1-5