debian/tests/unshare: use --bd-uninstallable-explainer=apt because the dose...

debian/tests/unshare: use --bd-uninstallable-explainer=apt because the dose explainer does not respect apt pinning and thus presents useless successes

This does not work for cross builds which use the sbuild-cross-resolver and then one just gets:

The solver encountered an error of type: ERR_UNSOLVABLE

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• a96d7a12 - wip

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The /usr/lib/apt/solvers/apt program can take CLI arguments like -oDebug::pkgProblemResolver=true. Unfortunately, the --solver=... option to apt only allows passing the binary itself but not options to the binary. So there needs to be some way to communicate to the sbuild-cross-resolver that it is to call /usr/lib/apt/solvers/apt with debugging options. There are multiple ways forward:

• set an environment variable SBUILD_CROSS_RESOLVER_DEBUG=true when calling apt and add debug options in sbuild-cross-resolver if the variable is set. The problem is, that the run_apt method in ResolverBase.pm has no way to pass environment variables, so the function would need to be extended.
• call apt with -oAPT::Solver::sbuild-cross-resolver::Preferences=debug which will add the string "debug" to the Preferences: field in the header of the EDSP document passed to sbuild-cross-resolver. The complication is, that then sbuild-cross-resolver has to both read that part of the EDSP and pass it to /usr/lib/apt/solvers/apt
• create a wrapper script sbuild-cross-resolver-debug which calls sbuild-cross-resolver but with the environment variable SBUILD_CROSS_RESOLVER_DEBUG=true set. The wrapper script could even be generated dynamically because it is so small?
• use a flag-file in /tmp which sbuild-cross-resolver can check and read

Using -oAPT::Solver::sbuild-cross-resolver::Preferences=debug might be the best option because we are mangling the EDSP anyways and the sbuild-cross-resolver utility is written in perl, so doing this processing is relatively easy.

TODO: in the apt explainer, call apt with -o APT::Solver::sbuild-cross-resolver::Preferences=debug and then in sbuild-cross-resolver process the head of the EDSP and us ethe content of the Preferences field to find out whether or not to call /var/lib/solver/apt with debug options or not.

added 1 commit

• f884b6f2 - lib/Sbuild/ChrootUnshare.pm: Use tar's --anchored option to support tarballs...

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added 15 commits

• a96d7a12...b7dbd7e2 - 13 commits from branch main
• cda3f839 - debian/tests/unshare: use --bd-uninstallable-explainer=apt because the dose...
• b3387cd8 - wip

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added 2 commits

• 13308ac5 - debian/tests/unshare: use --bd-uninstallable-explainer=apt because the dose...
• 1afc64a6 - bin/sbuild-cross-resolver: support debug output when used by the apt...

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added 15 commits

• 1afc64a6...b7dbd7e2 - 13 commits from branch main
• e2c582fe - debian/tests/unshare: use --bd-uninstallable-explainer=apt because the dose...
• 87d7a5b0 - bin/sbuild-cross-resolver: support debug output when used by the apt...

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added 2 commits

• fdfb23bc - debian/tests/unshare: use --bd-uninstallable-explainer=apt because the dose...
• 2ac71548 - bin/sbuild-cross-resolver: support debug output when used by the apt...

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merged