$ git clone -n https://src.fedoraproject.org/rpms/coolreader.git /var/lib/mock/f40-build-798496-141958/root/chroot_tmpdir/scmroot/coolreader
Cloning into '/var/lib/mock/f40-build-798496-141958/root/chroot_tmpdir/scmroot/coolreader'...
$ git fetch origin 012af9c2be9cabf962d6c1553e041c143c1b4e22:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/coolreader
 * [new ref]         012af9c2be9cabf962d6c1553e041c143c1b4e22 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 012af9c Rebuild for libunibreak update