$ git clone -n https://src.fedoraproject.org/rpms/c4core.git /var/lib/mock/f40-build-2208855-52141/root/chroot_tmpdir/scmroot/c4core
Cloning into '/var/lib/mock/f40-build-2208855-52141/root/chroot_tmpdir/scmroot/c4core'...
$ git fetch origin 58baf76b788d671a8a6bd33792fc98f538ab775d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/c4core
 * [new ref]         58baf76b788d671a8a6bd33792fc98f538ab775d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 58baf76 Break a long line in the spec file