$ git clone -n https://github.com/xcp-ng-rpms/swtpm.git /var/lib/mock/v8.3-incoming-9351-28109/root/chroot_tmpdir/scmroot/swtpm
Cloning into '/var/lib/mock/v8.3-incoming-9351-28109/root/chroot_tmpdir/scmroot/swtpm'...
$ git fetch origin 28e718225f24b1f0ded3f712716fe62e5c09a78f:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/swtpm
 * [new ref]         28e718225f24b1f0ded3f712716fe62e5c09a78f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 28e7182 Merge pull request #1 from xcp-ng-rpms/8.3-import_swtpm-0.7.3-9.xs8.src.rpm