$ git clone -n https://src.fedoraproject.org/rpms/copr-frontend.git /var/lib/mock/f40-build-2177890-51101/root/chroot_tmpdir/scmroot/copr-frontend
Cloning into '/var/lib/mock/f40-build-2177890-51101/root/chroot_tmpdir/scmroot/copr-frontend'...
$ git fetch origin 6e4d2ee7fded25d9bde4ef005449ba0ee7a99bba:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/copr-frontend
 * [new ref]         6e4d2ee7fded25d9bde4ef005449ba0ee7a99bba -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6e4d2ee Update copr-frontend to 1.202-1