$ git clone -n https://src.fedoraproject.org/rpms/trojita.git /var/lib/mock/f40-build-2270867-54856/root/chroot_tmpdir/scmroot/trojita
Cloning into '/var/lib/mock/f40-build-2270867-54856/root/chroot_tmpdir/scmroot/trojita'...
$ git fetch origin d91b69664166c5b8ac8b61bc3b8bb386297f25b5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/trojita
 * [new ref]         d91b69664166c5b8ac8b61bc3b8bb386297f25b5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d91b696 Disable Akonadi in flatpak builds