$ git clone -n https://src.fedoraproject.org/rpms/fbreader.git /var/lib/mock/f40-build-2209340-52153/root/chroot_tmpdir/scmroot/fbreader
Cloning into '/var/lib/mock/f40-build-2209340-52153/root/chroot_tmpdir/scmroot/fbreader'...
$ git fetch origin 4a5ea624ceb9af45d210bb75cbec18f0e4b8ab8d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fbreader
 * [new ref]         4a5ea624ceb9af45d210bb75cbec18f0e4b8ab8d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4a5ea62 Add missing changelog entry and bump release