$ git clone -n https://src.fedoraproject.org/rpms/ftp.git /var/lib/mock/f41-build-1020793-18018/root/chroot_tmpdir/scmroot/ftp
Cloning into '/var/lib/mock/f41-build-1020793-18018/root/chroot_tmpdir/scmroot/ftp'...
$ git fetch origin 1ac2c5a35b637b8d2845fbcad6eaf8daa7ef72b1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ftp
 * [new ref]         1ac2c5a35b637b8d2845fbcad6eaf8daa7ef72b1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1ac2c5a Eliminate use of obsolete %patchN syntax (#2283636)