$ git clone -n https://src.fedoraproject.org/rpms/calendar.git /var/lib/mock/f40-build-795835-140332/root/chroot_tmpdir/scmroot/calendar
Cloning into '/var/lib/mock/f40-build-795835-140332/root/chroot_tmpdir/scmroot/calendar'...
$ git fetch origin 0327816edb5dbad006cf7c069a811e6a4a7c3483:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/calendar
 * [new ref]         0327816edb5dbad006cf7c069a811e6a4a7c3483 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0327816 Upgrade to calendar(1) from OpenBSD 7.4