$ git clone -n https://src.fedoraproject.org/rpms/angelfish.git /var/lib/mock/f40-build-1500806-23881/root/chroot_tmpdir/scmroot/angelfish
Cloning into '/var/lib/mock/f40-build-1500806-23881/root/chroot_tmpdir/scmroot/angelfish'...
$ git fetch origin 62e871ec4cf9be610a62f00e87789117df9dcc57:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/angelfish
 * [new ref]         62e871ec4cf9be610a62f00e87789117df9dcc57 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 62e871e Merge branch 'rawhide' into f40