$ git clone -n https://src.fedoraproject.org/rpms/gbdfed.git /var/lib/mock/f41-build-816142-14288/root/chroot_tmpdir/scmroot/gbdfed
Cloning into '/var/lib/mock/f41-build-816142-14288/root/chroot_tmpdir/scmroot/gbdfed'...
$ git fetch origin a1da8f838a6744416e36bced891bef1bedba41a1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gbdfed
 * [new ref]         a1da8f838a6744416e36bced891bef1bedba41a1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a1da8f8 Eliminate use of obsolete %patchN syntax (#2283636)