$ git clone -n https://github.com/xcp-ng-rpms/swtpm.git /var/lib/mock/v8.3-u-pcoval1-11100-29526/root/chroot_tmpdir/scmroot/swtpm
Cloning into '/var/lib/mock/v8.3-u-pcoval1-11100-29526/root/chroot_tmpdir/scmroot/swtpm'...
$ git fetch origin c95fcefa0c7875082309b63bff97c89ca1fafc0e:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/swtpm
 * [new ref]         c95fcefa0c7875082309b63bff97c89ca1fafc0e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c95fcef bump release for test build