$ git clone -n https://src.fedoraproject.org/rpms/rubygem-childprocess.git /var/lib/mock/f41-build-1201371-22419/root/chroot_tmpdir/scmroot/rubygem-childprocess
Cloning into '/var/lib/mock/f41-build-1201371-22419/root/chroot_tmpdir/scmroot/rubygem-childprocess'...
$ git fetch origin 855db5e773af17cfdd7b684ee1b5c86daf247210:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-childprocess
 * [new ref]         855db5e773af17cfdd7b684ee1b5c86daf247210 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 855db5e Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild