$ git clone -n https://github.com/xcp-ng-rpms/sm.git /var/lib/mock/v8.3-incoming-11594-29885/root/chroot_tmpdir/scmroot/sm
Cloning into '/var/lib/mock/v8.3-incoming-11594-29885/root/chroot_tmpdir/scmroot/sm'...
$ git fetch origin 82536f09102d3f4c203123d28f85c8fad07b4250:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/sm
 * [new ref]         82536f09102d3f4c203123d28f85c8fad07b4250 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 82536f0 Merge pull request #92 from xcp-ng-rpms/dtt-8.3-fix-cbtlog