$ git clone -n https://src.fedoraproject.org/rpms/appstream-generator.git /var/lib/mock/f41-build-856455-167621/root/chroot_tmpdir/scmroot/appstream-generator
Cloning into '/var/lib/mock/f41-build-856455-167621/root/chroot_tmpdir/scmroot/appstream-generator'...
$ git fetch origin 3f37f2152070ee46e111ad8eab73d392e17387e3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/appstream-generator
 * [new ref]         3f37f2152070ee46e111ad8eab73d392e17387e3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3f37f21 Rebuilt for ldc 1.39