$ git clone -n https://github.com/xcp-ng-rpms/swtpm.git /var/lib/mock/v8.3-u-pcoval2-10192-28776/root/chroot_tmpdir/scmroot/swtpm
Cloning into '/var/lib/mock/v8.3-u-pcoval2-10192-28776/root/chroot_tmpdir/scmroot/swtpm'...
$ git fetch origin f9ef4fced3e4058bf4e23fc002c00c687801428c:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/swtpm
 * [new ref]         f9ef4fced3e4058bf4e23fc002c00c687801428c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f9ef4fc bump release for test build