$ git clone -n https://src.fedoraproject.org/rpms/perl-Config-Onion.git /var/lib/mock/f45-build-22494-591/root/chroot_tmpdir/scmroot/perl-Config-Onion
Cloning into '/var/lib/mock/f45-build-22494-591/root/chroot_tmpdir/scmroot/perl-Config-Onion'...
$ git fetch origin fcbfb47105e82a9240776cc7527caccaf9daeeee:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Config-Onion
 * [new ref]         fcbfb47105e82a9240776cc7527caccaf9daeeee -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fcbfb47 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild