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On 2011-05-17 18:16, Colin Watson wrote:
> On Sat, May 14, 2011 at 07:50:45PM +0200, Niels Thykier wrote:
>> On 2011-05-13 11:19, Niels Thykier wrote:
>>> I had a short chat with Raphaël Hertzog (buxy) in #debian-qa about this
>>> and he said that the unpacking part of the module was rather stable and
>>> "it's certainly ok as a fallback when dpkg-source is not there".
>>>
>>> So as long as we only need dpkg-source -x (and not dpkg-source -b) we
>>> can use libdpkg-perl.
>>
>> Functional proof-of-concept patch; simply apply and profit! The code is
>> stolen from dpkg-source and cooked down a bit (... a lot).
>>
>> The patch here disables dpkg-source unpacking all together (saves you
>> from peeling out dpkg-dev from a system).
>
> That's a bit further than what Raphaël said this API was OK for - not
> just "a fallback when dpkg-source is not there". Have you
> double-checked that with him?
>
It was not my intention to apply this patch as is. The argument for
disabling the dpkg-source usage was to ease your job as a tester (so you
did not have to uninstall dpkg-dev from your machines).
>> The patch does not account for updating the Lintian Depends; I suspect
>> that dpkg-dev should be replaced with bzip2, xz-utils and
>> libdpkg-perl. The former two can be most likely be left out if you
>> know there are no bz2 / xz / lmza sources.
>
> Or perhaps we can just rely on libdpkg-perl's Recommends of bzip2 and
> xz-utils?
>
Possibly, I hope some of the other Lintian maintainers have a comment on
this. Should we just go with Depends: dpkg-dev | libdpkg-perl or do we
want ...
Recommends: dpkg-dev
Depends/Recommends: bzip2, xz-utils
?
>> I had to redirect STDOUT of unpacked to keeping it the unpack process
>> quiet (otherwise it would break the output format of Lintian)[1].
>
> You're right that Dpkg::ErrorHandling::report_options isn't marked as
> stable, but shouldn't we at least be using options => { quiet => 1 } as
> an argument to Dpkg::Source::Package->new as well as this, to match
> dpkg-source -q? It doesn't do much right now, but in principle it seems
> as though it might avoid noise on stderr.
>
Sure, I can add that.
>> + libdpkg_unpack_dsc ('dsc', 'unpacked');
>
> Style nit: no space before the open parenthesis.
>
Right...
>> +sub libdpkg_unpack_dsc {
>> + my ($dsc, $target) = @_;
>> + require Dpkg::Source::Package;
>> + open(STDOUT, '>', '/dev/null') or fail "Redirecting stdout failed: $!";
>> + # Create the object that does everything
>> + my $srcpkg = Dpkg::Source::Package->new(filename => $dsc);
>> +
>> + $srcpkg->check_checksums();
>> +
>> + # Unpack the source package (delegated to Dpkg::Source::Package::*)
>> + $srcpkg->extract($target);
>> + return 1;
>> +}
>
> This drops the signature check currently performed by dpkg-source, so it
> changes Lintian's behaviour to (a) accept .dsc files with bad signatures
> and (b) stop issuing a warning for unsigned .dsc files. This seems
> undesirable.
>
> Aside from that, the patch does seem to work as advertised. Thanks!
>
Actually as far as I can tell, we do not get any warnings on unsigned
source packages (possibly due to the -q option), but sure, checking
signatures should not be an issue either.
~Niels
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