$ git clone -n https://src.fedoraproject.org/rpms/cocoalib.git /var/lib/mock/f41-build-846067-162955/root/chroot_tmpdir/scmroot/cocoalib
Cloning into '/var/lib/mock/f41-build-846067-162955/root/chroot_tmpdir/scmroot/cocoalib'...
$ git fetch origin a0c543ffa0cc23eed42c8b306c5d8e7b09786ab4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cocoalib
 * [new ref]         a0c543ffa0cc23eed42c8b306c5d8e7b09786ab4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a0c543f Rebuild for gfan 0.7