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authorDavid Kalnischkies <david@kalnischkies.de>2015-06-12 02:08:53 +0200
committerDavid Kalnischkies <david@kalnischkies.de>2015-06-12 16:33:37 +0200
commitb07aeb1a6e24825e534167a737043441e871de9f (patch)
treeb47b5bced3f6352e2cdd6cfa550e351e8cd6ebab /debian/apt.postrm
parent8881b11eacd735148d087c8c0f53827cb537b582 (diff)
store Release files data in the Cache
We used to read the Release file for each Packages file and store the data in the PackageFile struct even through potentially many Packages (and Translation-*) files could use the same data. The point of the exercise isn't the duplicated data through. Having the Release files as first-class citizens in the Cache allows us to properly track their state as well as allows us to use the information also for files which aren't in the cache, but where we know to which Release file they belong (Sources are an example for this). This modifies the pkgCache structs, especially the PackagesFile struct which depending on how libapt users access the data in these structs can mean huge breakage or no visible change. As a single data point: aptitude seems to be fine with this. Even if there is breakage it is trivial to fix in a backportable way while avoiding breakage for everyone would be a huge pain for us. Note that not all PackageFile structs have a corresponding ReleaseFile. In particular the dpkg/status file as well as *.deb files have not. As these have only a Archive property need, the Component property takes over this duty and the ReleaseFile remains zero. This is also the reason why it isn't needed nor particularily recommended to change from PackagesFile to ReleaseFile blindly. Sticking with the earlier is usually the better option.
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