$ git clone -n https://src.fedoraproject.org/rpms/ceph.git /var/lib/mock/f41-build-side-1-2632921-25863/root/chroot_tmpdir/scmroot/ceph
Cloning into '/var/lib/mock/f41-build-side-1-2632921-25863/root/chroot_tmpdir/scmroot/ceph'...
remote: warning: refname 'HEAD' is ambiguous.        
$ git fetch origin 1617d904e26768f2b918882c255709e01525faa8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ceph
 * [new ref]         1617d904e26768f2b918882c255709e01525faa8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1617d90 ceph-19.1.1 RC