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Index parser: support multiple package providers

postmarketOS Bot requested to merge fix/1122-pmbootstrap-picks-wrong-so-provider into master

Created by: ollieparanoid

  • The APKINDEX parser used to return a dictionary with one package for a given package name. This works for the installed packages database, because there can only be one provider for a package. But when parsing packages from binary repositories, we need to support multiple providers for one package. It is now possible to get a dictionary with either multiple providers, or just a single provider for each package.
  • Dependency parsing logic has been adjusted, to support multiple providers. For multiple providers, the one with the same package name as the package we are looking up is prefered. If there is none (eg. "so:libEGL.so.1" is provided by "mesa-egl"), it prefers packages that will be installed anyway, and after that packages that are already installed. When all else fails, it just picks the first one and prints a note in the "pmbootstrap log".
  • Added testcases for all functions in pmb.parse.apkindex and pmb.parse.depends
  • pmbootstrap chroot has a new "--add" parameter to specify packages that pmbootstrap should build if neccessary, and install in the chroot. This can be used to quickly test the depencency resolution of pmbootstrap without doing a full "pmbootstrap install".

Fixes #1122 (closed).

@NotKit: Could you review/test this?

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