$ git clone -n https://src.fedoraproject.org/rpms/perl-Frontier-RPC.git /var/lib/mock/f40-build-2239183-53602/root/chroot_tmpdir/scmroot/perl-Frontier-RPC
Cloning into '/var/lib/mock/f40-build-2239183-53602/root/chroot_tmpdir/scmroot/perl-Frontier-RPC'...
$ git fetch origin eee2ab286db86c09706e7db75cc0689257942a76:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Frontier-RPC
 * [new ref]         eee2ab286db86c09706e7db75cc0689257942a76 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at eee2ab2 Modernize specfile