$ git clone -n https://src.fedoraproject.org/rpms/kf5-kcrash.git /var/lib/mock/f45-build-14827-464/root/chroot_tmpdir/scmroot/kf5-kcrash
Cloning into '/var/lib/mock/f45-build-14827-464/root/chroot_tmpdir/scmroot/kf5-kcrash'...
$ git fetch origin 7618e38e84e665f1effa0e011772fa1114bbdcee:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf5-kcrash
 * [new ref]         7618e38e84e665f1effa0e011772fa1114bbdcee -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7618e38 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild