$ git clone -n https://src.fedoraproject.org/rpms/po4a.git /var/lib/mock/f40-build-1136212-20639/root/chroot_tmpdir/scmroot/po4a
Cloning into '/var/lib/mock/f40-build-1136212-20639/root/chroot_tmpdir/scmroot/po4a'...
$ git fetch origin 08d210453c25e6b4f70b927478b6d60ad9933ec3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/po4a
 * [new ref]         08d210453c25e6b4f70b927478b6d60ad9933ec3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 08d2104 Update to 0.72 upstream release