$ git clone -n https://src.fedoraproject.org/rpms/kf6-kcalendarcore.git /var/lib/mock/f42-build-867686-175757/root/chroot_tmpdir/scmroot/kf6-kcalendarcore
Cloning into '/var/lib/mock/f42-build-867686-175757/root/chroot_tmpdir/scmroot/kf6-kcalendarcore'...
$ git fetch origin f4497ac6c072276033f1810ed705ed4e0b02fce1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-kcalendarcore
 * [new ref]         f4497ac6c072276033f1810ed705ed4e0b02fce1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f4497ac Rebuilt for https://fedoraproject.org/wiki/Fedora_42_Mass_Rebuild