$ git clone -n https://src.fedoraproject.org/rpms/charliecloud.git /var/lib/mock/f41-build-875109-16267/root/chroot_tmpdir/scmroot/charliecloud
Cloning into '/var/lib/mock/f41-build-875109-16267/root/chroot_tmpdir/scmroot/charliecloud'...
$ git fetch origin 6d03fd1444a8158c32e585aa84b161ea820fa96c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/charliecloud
 * [new ref]         6d03fd1444a8158c32e585aa84b161ea820fa96c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6d03fd1 Eliminate use of obsolete %patchN syntax (#2283636)