$ git clone -n https://src.fedoraproject.org/rpms/fish.git /var/lib/mock/f42-build-3342628-44991/root/chroot_tmpdir/scmroot/fish
Cloning into '/var/lib/mock/f42-build-3342628-44991/root/chroot_tmpdir/scmroot/fish'...
$ git fetch origin b200db49e9e2739c159d35527fb8797a5c934e03:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fish
 * [new ref]         b200db49e9e2739c159d35527fb8797a5c934e03 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b200db4 Enable Packit