$ git clone -n https://src.fedoraproject.org/rpms/snapshot.git /var/lib/mock/eln-build-side-114737-60967297-6587091/root/chroot_tmpdir/scmroot/snapshot
Cloning into '/var/lib/mock/eln-build-side-114737-60967297-6587091/root/chroot_tmpdir/scmroot/snapshot'...
$ git fetch origin 5a25a85444a6d79d5be38aff276943fbcb8f49f4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/snapshot
 * [new ref]         5a25a85444a6d79d5be38aff276943fbcb8f49f4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5a25a85 Update to version 49.alpha