$ git clone -n https://src.fedoraproject.org/rpms/credentials-fetcher.git /var/lib/mock/f41-build-848496-164447/root/chroot_tmpdir/scmroot/credentials-fetcher
Cloning into '/var/lib/mock/f41-build-848496-164447/root/chroot_tmpdir/scmroot/credentials-fetcher'...
$ git fetch origin b9f67282705324ddb1e9f99f0ea1725ad74211a9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/credentials-fetcher
 * [new ref]         b9f67282705324ddb1e9f99f0ea1725ad74211a9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b9f6728 update credspec to fix errors