[buildd-tools-devel] Bug#602571: Bug#602571: cannot build due to ESSENTIAL dep phase

[Roger Leigh]

On Fri, Nov 05, 2010 at 05:55:34PM -0700, Kees Cook wrote:
> Package: sbuild
> Version: 0.60.2-1
> Severity: normal
> User: ubuntu-devel at lists.ubuntu.com
> Usertags: origin-ubuntu natty
> 
> It seems that the ESSENTIAL dep resolution breaks me (at least on Ubuntu).
> I had to "exit 1" from install_essential() to restore my ability to build
> (0.60.0 was working fine).
> sysvinit: missing
> I assume "sysvinit: missing" is the problem, but that should be satisfied
> by "sysvinit-utils":

Grr, that's annoying.  I've not seen this on Debian, but I do have the
actual sysvinit package installed.  So it's likely an issue with
checking if virtual packages are installed.

Note that the "aptitude" resolver should cope just fine with this;
if you set $build_dep_resolver='aptitude' in your .sbuildrc, do
you still have any problems?  I'm planning on making the aptitude
resolver the default with the next release since situations like
this are handled much better.

The "internal" resolver has only rudimentary support for virtual
package installation (added with this release).  This is however
only currently used for installation of build-deps, not checking
if a dependency is actually installed, so doesn't do a good job
of checking in this situation.  I've taken a look at the code
(lib/Sbuild/InternalResolver.pm in git), but I'm not currently
sure what the best strategy is to handle this.


Note: the current git master may be worth trying here, since I've made
some changes to both the aptitude and internal resolvers since 0.60.2
was released.

Could you possibly try current git master and run with script to
capture all stderr and with --debug to turn on debugging messages?
This should let us know exactly where it's getting stuck.  I'm
not sure the "missing" error above is where it's getting stuck.
That's in filter_dependencies and it /should/ rewrite in
virtual_dependencies() to handle installation of a real package,
but this doesn't take into account if it's installed under another
name (which it is).  We might need to be more intelligent about this
and do the rewriting while checking if the package is already
installed.  Any thoughts?

Hopefully the "internal" resolver will be removed in time, since it's
rather limited, but the Debian buildds will use it until at least
squeeze release.  So getting this fixed would be ideal.


Thanks,
Roger

-- 
  .''`.  Roger Leigh
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