Date: Sat, 10 Apr 2010 14:12:14 -0700 From: Julian Elischer <julian@elischer.org> To: Tim Kientzle <kientzle@freebsd.org> Cc: ports@freebsd.org, "Sam Fourman Jr." <sfourman@gmail.com>, FreeBSD Current <current@freebsd.org> Subject: Re: ports and PBIs Message-ID: <4BC0E9AE.1000904@elischer.org> In-Reply-To: <4BC0CC6F.7010009@freebsd.org> References: <4BBFD502.1010507@elischer.org> <r2w6201873e1004092011y829fe434w724ccde9cbf78e2c@mail.gmail.com> <o2z11167f521004092328z50ed9c9zde0294a344439709@mail.gmail.com> <x2i7d6fde3d1004100020oc8be3c51ree5f1e4b07b99f45@mail.gmail.com> <4BC03ABA.6090309@elischer.org> <q2q7d6fde3d1004100335ucf424ae0gbfcdba950fd68767@mail.gmail.com> <4BC0CC6F.7010009@freebsd.org>
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On 4/10/10 12:07 PM, Tim Kientzle wrote: > Garrett Cooper wrote: >> If I'm understanding you correctly you're saying it's an issue when I do: >> >> pkg_add A B C >> >> # 1 year passes >> >> pkg_add D >> >> # D depends on A, B, C, of different revisions. pkg_add barfs because >> it can't find the applications, etc. >> >> This is something that's been hashed over a number of times (a few of >> which I've participated in in #bsdports). There needs to be a simple >> update command which will handle the action of upgrading packages, >> because there isn't a proper command that will do so today. > > I'm not convinced that the "simple update command" you > mention is actually feasible, much less desirable. > (If I want to try out the new Firefox, why does that > imply that my year-old Gimp has to be upgraded?) > > As for feasibility, here's the easy problem: > A2.7 requires B3.6 > ... one year passes ... > A4.8 now requires B7.2 > But A4.8 is incompatible with B3.6 and A2.7 is > incompatible with B7.2. So neither A nor B > can be updated separately without breaking the system. > > Here's the hard problem: > A2.7 requires B3.6 > ... one year passes ... > I want to install C1.0 which requires B7.2 > but there hasn't been a new release of A that > works with B7.2. > So I now simply cannot have both C1.0 and A2.7 > installed at the same time because they require > different versions of B. > > PBI avoids both of these problems. It may > be unsuitable for embedded systems[1], but > I see no reason we should not extend the existing > ports/packages system with additional tools that > target certain use cases, and PBI seems a good > fit for the desktop case. > > Tim > > [1] Actually, PBI might work just fine even for > embedded if we address the disk bloat issue. One > approach would be to make > /Package/Bar/libfoo-2.8.7.so > a symlink or hardlink to > /Package/Shared/libfoo-2.8.7.so-<MD5-hash> > This gives easy sharing of identical files. > It's even easy to handle at install time: > * Installer writes libfoo-2.8.7.so to > /Package/Shared/libfoo-2.8.7.so-temp-<PID of installer> > * Installer computes hash of file as it's written > * Installer renames file (delete if rename fails with EEXIST) > * Installer writes symlink or hardlink into /Package/Bar yeah that's more or less what we were thinking.. hardlinks allow you to garbage collect when the last pbi that needs something is replaced/removed. It's also to handle the cases where library A wants library B. you don't want library A in the shared place looking for B back in the original PBI directory so there may need to be some patching up. > > _______________________________________________ > freebsd-current@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-current > To unsubscribe, send any mail to "freebsd-current-unsubscribe@freebsd.org"
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