[quagga-dev 16627] Re: Reproducibility problem

Balaji Gurudoss balajig81 at gmail.com
Fri Jun 23 17:39:33 BST 2017


Hi



On Fri, Jun 23, 2017 at 7:32 PM, Gábor Boskovits <boskovits at gmail.com>
wrote:

> Hello quagga!
>
> I'm trying to package quagga for guix.
>
> Package complies all right, test suite runs ok.
>
> The only problem seem, that the build is not reproducible.
>

Can you clarify on what you mean by build is not reproducible ?

>
> I managed narrow that down to that generating vtysh_cmd.c is not
> deterministic.
>
> At first I thought is is just an ordering issue.
>
> I checked the code, and it seems, that DEFSH function definitions can be
> freely moved around, and the order of install_elements seem not matter also.
>
> I wrote a simple post processor to get identical ordering.
>
> However after ordering the files are still different.
>
> Here is an example diff:
>
> gabriel at guixsd-test ~/quaqqa-sorter [env]$ diff cmd.c.sorted cmd.c.sorted2
> 1979,1989d1978
> < DEFSH (VTYSH_BGPD, clear_ip_bgp_all_vpnv4_soft_in_cmd_vtysh,
> <        "clear ip bgp * vpnv4 unicast soft in",
> <        "Reset functions\n"
> <        "IP information\n"
> <        "BGP information\n"
> <        "Clear all peers\n"
> <        "Address family\n"
> <        "Address Family Modifier\n"
> <        "Soft reconfig inbound and outbound updates\n"
> <        "Send route-refresh unless using 'soft-reconfiguration
> inbound'\n")
> <
> 5023a5013,5022
> > DEFSH (VTYSH_BGPD, no_neighbor_attr_unchanged5_cmd_vtysh,
> >        "no neighbor (A.B.C.D|X:X::X:X|WORD) " "attribute-unchanged
> as-path next-hop med",
> >        "Negate a command or set its defaults\n"
> >        "Specify neighbor router\n"
> >        "Neighbor address\nNeighbor IPv6 address\nNeighbor tag\n"
> >        "BGP attribute is propagated unchanged to this neighbor\n"
> >        "As-path attribute\n"
> >        "Nexthop attribute\n"
> >        "Med attribute\n")
> >
> 13193,13201c13192,13201
> < DEFSH (VTYSH_BGPD, no_neighbor_attr_unchanged5_cmd_vtysh,
> <        "no neighbor (A.B.C.D|X:X::X:X|WORD) " "attribute-unchanged
> as-path next-hop med",
> <        "Negate a command or set its defaults\n"
> <        "Specify neighbor router\n"
> <        "Neighbor address\nNeighbor IPv6 address\nNeighbor tag\n"
> <        "BGP attribute is propagated unchanged to this neighbor\n"
> <        "As-path attribute\n"
> <        "Nexthop attribute\n"
> <        "Med attribute\n")
> ---
> > DEFSH (VTYSH_BGPD, clear_ip_bgp_all_vpnv4_soft_in_cmd_vtysh,
> >        "clear ip bgp * vpnv4 unicast soft in",
> >        "Reset functions\n"
> >        "IP information\n"
> >        "BGP information\n"
> >        "Clear all peers\n"
> >        "Address family\n"
> >        "Address Family Modifier\n"
> >        "Soft reconfig inbound and outbound updates\n"
> >        "Send route-refresh unless using 'soft-reconfiguration
> inbound'\n")
>
> I do not always exactly get this diff.
>
> I would like to know, if this behaviour is intentional.
>
> If it is not, I'm willing to help, if you think it worth.
>
> I can send the way I am sorting the file now, if that helps.
>
>
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> Quagga-dev at lists.quagga.net
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>
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