$ git clone -n https://src.fedoraproject.org/rpms/mod_bw.git /var/lib/mock/f41-build-1022450-18076/root/chroot_tmpdir/scmroot/mod_bw
Cloning into '/var/lib/mock/f41-build-1022450-18076/root/chroot_tmpdir/scmroot/mod_bw'...
$ git fetch origin 27b27a07aeb694b71d62768b8944fff02aed3502:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mod_bw
 * [new ref]         27b27a07aeb694b71d62768b8944fff02aed3502 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 27b27a0 Eliminate use of obsolete %patchN syntax (#2283636)