$ git clone -n https://github.com/xcp-ng-rpms/ca-certificates /var/lib/mock/v8.3-u-pcoval2-11063-29498/root/chroot_tmpdir/scmroot/ca-certificates
Cloning into '/var/lib/mock/v8.3-u-pcoval2-11063-29498/root/chroot_tmpdir/scmroot/ca-certificates'...
$ git fetch origin fb6b0fdc1637c8a037c68e6bb5b4014040ddf930:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/ca-certificates
 * [new ref]         fb6b0fdc1637c8a037c68e6bb5b4014040ddf930 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fb6b0fd bump release for test build