$ git clone -n https://src.fedoraproject.org/rpms/dynamic-hibernate.git /var/lib/mock/f45-build-39645-750/root/chroot_tmpdir/scmroot/dynamic-hibernate
Cloning into '/var/lib/mock/f45-build-39645-750/root/chroot_tmpdir/scmroot/dynamic-hibernate'...
$ git fetch origin c0a421f0aa4f91034bab3340f67eb62a54183394:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/dynamic-hibernate
 * [new ref]         c0a421f0aa4f91034bab3340f67eb62a54183394 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c0a421f Allow sysinfo versions through 0.39