$ git clone -n https://src.fedoraproject.org/rpms/bwa.git /var/lib/mock/f41-build-1034397-18630/root/chroot_tmpdir/scmroot/bwa
Cloning into '/var/lib/mock/f41-build-1034397-18630/root/chroot_tmpdir/scmroot/bwa'...
$ git fetch origin a568a0660c4820fc7d7297c32bae7bcb32fb90a0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/bwa
 * [new ref]         a568a0660c4820fc7d7297c32bae7bcb32fb90a0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a568a06 Eliminate use of obsolete %patchN syntax (#2283636)