$ git clone -n https://src.fedoraproject.org/rpms/bristol.git /var/lib/mock/f42-build-882127-184162/root/chroot_tmpdir/scmroot/bristol
Cloning into '/var/lib/mock/f42-build-882127-184162/root/chroot_tmpdir/scmroot/bristol'...
$ git fetch origin b3abd15c5d398dd7a294b6f33e6b8d3d1aab09e4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/bristol
 * [new ref]         b3abd15c5d398dd7a294b6f33e6b8d3d1aab09e4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b3abd15 Fix FTBFS