$ git clone -n https://src.fedoraproject.org/rpms/libunibreak.git /var/lib/mock/f40-build-2219971-52649/root/chroot_tmpdir/scmroot/libunibreak
Cloning into '/var/lib/mock/f40-build-2219971-52649/root/chroot_tmpdir/scmroot/libunibreak'...
$ git fetch origin fccb66b9700d240038ad27199b0bc87edbe397cb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libunibreak
 * [new ref]         fccb66b9700d240038ad27199b0bc87edbe397cb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fccb66b Fix Release: