$ git clone -n https://src.fedoraproject.org/rpms/kf5-kactivities.git /var/lib/mock/f45-build-14775-463/root/chroot_tmpdir/scmroot/kf5-kactivities
Cloning into '/var/lib/mock/f45-build-14775-463/root/chroot_tmpdir/scmroot/kf5-kactivities'...
$ git fetch origin 1fb8dca1ac49a9b9075d96b31df0ce98fe6b48bf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf5-kactivities
 * [new ref]         1fb8dca1ac49a9b9075d96b31df0ce98fe6b48bf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1fb8dca Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild