Perl AptPkg bindings: no binpkg(name, ver) -> srcpkg(name, ver) mapping?

[Mihai Moldovan <ionic@ionic.de>]

Hello fellow developers


I'm currently using the Perl AptPkg bindings to read and handle package cache 
metadata.

I'd like to map a bin:pkg name and version to its corresponding src:pkg ame and 
version, but unless I missed something, this doesn't seem to be possible?

Mapping a bin:pkg name to a src:pkg is easy, through AptPkg::Source(->find), but 
getting the correct version seems to be impossible.

Generally, binary and source package versions may not be identical, e.g., lvm2 
-⁠> dmsetup.

While AptPkg::Source->find will return a list of source packages for a given 
binary package, if the list contains multiple entries, there's no way to tell 
which entry might be a appropriate for a given bin:pkg version, since while the 
AptPkg::Source data contains a list of bin:pkgs, these are unversioned.

Likewise, looking up an AptPkg::Cache::VerFile object via 
AptPkg::PkgRecords-⁠>lookup will return a SourcePkg hash field, but the data in 
there is also just the unversioned source package name.


Contrary to that, the apt_pkg python bindings do provide a source_ver method as 
part of its PackageRecords class, which is pretty much exactly what one would need.


Have a I missed anything and just not looked deeply enough into AptPkg, or is 
what I want to do really impossible?




Mihai

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