$ git clone -n https://github.com/xcp-ng-rpms/swtpm.git /var/lib/mock/v8.3-u-prebuild-9279-28057/root/chroot_tmpdir/scmroot/swtpm
Cloning into '/var/lib/mock/v8.3-u-prebuild-9279-28057/root/chroot_tmpdir/scmroot/swtpm'...
$ git fetch origin 9ec38016c889c9f28f2da5480ad1fddc992d1fa2:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/swtpm
 * [new ref]         9ec38016c889c9f28f2da5480ad1fddc992d1fa2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9ec3801 bump release for test build