$ git clone -n https://src.fedoraproject.org/rpms/rubygem-pdf-core.git /var/lib/mock/f40-build-2323162-58699/root/chroot_tmpdir/scmroot/rubygem-pdf-core
Cloning into '/var/lib/mock/f40-build-2323162-58699/root/chroot_tmpdir/scmroot/rubygem-pdf-core'...
$ git fetch origin b5f74432c3269ee015fe606c15af03a941366f42:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-pdf-core
 * [new ref]         b5f74432c3269ee015fe606c15af03a941366f42 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b5f7443 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild