$ git clone -n https://src.fedoraproject.org/rpms/akonadi-calendar.git /var/lib/mock/f42-build-3409104-45146/root/chroot_tmpdir/scmroot/akonadi-calendar
Cloning into '/var/lib/mock/f42-build-3409104-45146/root/chroot_tmpdir/scmroot/akonadi-calendar'...
$ git fetch origin 5875e02a6bdafcdeaf0f52495f1a4760c9254eb9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/akonadi-calendar
 * [new ref]         5875e02a6bdafcdeaf0f52495f1a4760c9254eb9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5875e02 24.12.3