$ git clone -n https://src.fedoraproject.org/rpms/rubygem-sync.git /var/lib/mock/f40-build-2323554-58722/root/chroot_tmpdir/scmroot/rubygem-sync
Cloning into '/var/lib/mock/f40-build-2323554-58722/root/chroot_tmpdir/scmroot/rubygem-sync'...
$ git fetch origin ac003fdf3ac9adfb19c97afeb7f0b7f21d0db572:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-sync
 * [new ref]         ac003fdf3ac9adfb19c97afeb7f0b7f21d0db572 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ac003fd Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild