$ git clone -n https://src.fedoraproject.org/rpms/rubygem-marc.git /var/lib/mock/f39-build-1499354-34744/root/chroot_tmpdir/scmroot/rubygem-marc
Cloning into '/var/lib/mock/f39-build-1499354-34744/root/chroot_tmpdir/scmroot/rubygem-marc'...
$ git fetch origin f926c3ae5fd511f93d9f53f5bc2e3db448eea49d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-marc
 * [new ref]         f926c3ae5fd511f93d9f53f5bc2e3db448eea49d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f926c3a Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild