$ git clone -n https://github.com/xcp-ng-rpms/sm.git /var/lib/mock/v8.3-incoming-11546-29855/root/chroot_tmpdir/scmroot/sm
Cloning into '/var/lib/mock/v8.3-incoming-11546-29855/root/chroot_tmpdir/scmroot/sm'...
$ git fetch origin 1019c3bd861e83c6e68e0ad3676da95c288b14e9:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/sm
 * [new ref]         1019c3bd861e83c6e68e0ad3676da95c288b14e9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1019c3b Merge pull request #91 from xcp-ng-rpms/XCPNG-3181/8.3