$ git clone -n https://src.fedoraproject.org/rpms/flamethrower.git /var/lib/mock/f40-build-1996477-44021/root/chroot_tmpdir/scmroot/flamethrower
Cloning into '/var/lib/mock/f40-build-1996477-44021/root/chroot_tmpdir/scmroot/flamethrower'...
$ git fetch origin 0868a094318f5203dccba51b338085a7d5ef70d5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/flamethrower
 * [new ref]         0868a094318f5203dccba51b338085a7d5ef70d5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0868a09 Fix previous test to use just built libs