$ git clone -n https://src.fedoraproject.org/rpms/rwall.git /var/lib/mock/f41-build-1049315-19179/root/chroot_tmpdir/scmroot/rwall
Cloning into '/var/lib/mock/f41-build-1049315-19179/root/chroot_tmpdir/scmroot/rwall'...
$ git fetch origin 95ca9a4abb595d458b60b536999efc2caba7e9e3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rwall
 * [new ref]         95ca9a4abb595d458b60b536999efc2caba7e9e3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 95ca9a4 Eliminate use of obsolete %patchN syntax (#2283636)