$ git clone -n https://src.fedoraproject.org/rpms/jc.git /var/lib/mock/f42-build-side-1-3498652-45963/root/chroot_tmpdir/scmroot/jc
Cloning into '/var/lib/mock/f42-build-side-1-3498652-45963/root/chroot_tmpdir/scmroot/jc'...
$ git fetch origin d50888f73c44a871b8c0aace17b0dc60485325fc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jc
 * [new ref]         d50888f73c44a871b8c0aace17b0dc60485325fc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d50888f Rebuilt for https://fedoraproject.org/wiki/Fedora_42_Mass_Rebuild