$ git clone -n https://src.fedoraproject.org/flatpaks/calibre /var/tmp/koji/tasks/873/131870873/calibre
Cloning into '/var/tmp/koji/tasks/873/131870873/calibre'...
$ git fetch origin a203cb98279680ec94928f39d474853c7a9ed5a1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/flatpaks/calibre
 * [new ref]         a203cb98279680ec94928f39d474853c7a9ed5a1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a203cb9 Not yet enabled on ppc64le