$ git clone -n https://src.fedoraproject.org/rpms/kf5-kcalendarcore.git /var/lib/mock/f45-build-14830-464/root/chroot_tmpdir/scmroot/kf5-kcalendarcore
Cloning into '/var/lib/mock/f45-build-14830-464/root/chroot_tmpdir/scmroot/kf5-kcalendarcore'...
$ git fetch origin 8af7533e16c9f4a3da3e3fc1513d34a4491aa792:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf5-kcalendarcore
 * [new ref]         8af7533e16c9f4a3da3e3fc1513d34a4491aa792 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8af7533 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild