$ git clone -n https://src.fedoraproject.org/rpms/cyrus-imapd.git /var/lib/mock/f40-build-2217420-52549/root/chroot_tmpdir/scmroot/cyrus-imapd
Cloning into '/var/lib/mock/f40-build-2217420-52549/root/chroot_tmpdir/scmroot/cyrus-imapd'...
$ git fetch origin 9b1a600f394a8ccdadaa8a6e2d52ace11604dd80:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cyrus-imapd
 * [new ref]         9b1a600f394a8ccdadaa8a6e2d52ace11604dd80 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9b1a600 Rebuild (shapelib)