$ git clone -n https://github.com/xcp-ng-rpms/swtpm.git /var/lib/mock/v8.3-incoming-9857-28574/root/chroot_tmpdir/scmroot/swtpm
Cloning into '/var/lib/mock/v8.3-incoming-9857-28574/root/chroot_tmpdir/scmroot/swtpm'...
$ git fetch origin 982ca8912b53f361d64be4c5e21fb373c07d7f53:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/swtpm
 * [new ref]         982ca8912b53f361d64be4c5e21fb373c07d7f53 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 982ca89 Merge branch 'XS-8.3'