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Date:      Sun, 11 Apr 2010 21:49:09 +1200
From:      James Butler <sweetnavelorange@gmail.com>
To:        Tim Kientzle <kientzle@freebsd.org>
Cc:        Adam Vande More <amvandemore@gmail.com>, Kris Moore <kris@pcbsd.com>, John Hixson <jhixson@gmail.com>, "ports@freebsd.org" <ports@freebsd.org>, Julian Elischer <julian@elischer.org>, "Dave Fourman\(Gmail\)" <dfourman@gmail.com>, "Sam Fourman Jr." <sfourman@gmail.com>, Garrett Cooper <yanefbsd@gmail.com>, Matt Olander <matt@ixsystems.com>, Vanessa Kraus <vmkraus@gmail.com>, FreeBSD Current <current@freebsd.org>
Subject:   Re: ports and PBIs
Message-ID:  <g2nf0dd9eb91004110249m65161b1cve80a9d3db7e8d360@mail.gmail.com>
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 Sunday, April 11, 2010, Tim Kientzle <kientzle@freebsd.org> 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:
>  =C2=A0 A2.7 requires B3.6
>  =C2=A0 =C2=A0 ... one year passes ...
>  =C2=A0 A4.8 now requires B7.2
> But A4.8 is incompatible with B3.6 and A2.7 is
> incompatible with B7.2. =C2=A0So neither A nor B
> can be updated separately without breaking the system.
>
> Here's the hard problem:
>  =C2=A0 A2.7 requires B3.6
>  =C2=A0 =C2=A0 ... one year passes ...
>  =C2=A0 I want to install C1.0 which requires B7.2
>  =C2=A0 but there hasn't been a new release of A that
>  =C2=A0 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. =C2=A0It 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

Genuine (possibly stupid) question - in PBI land, what happens if
package B is, say, CUPS? Does one need versioned rc.d scripts to start
one or the other? Which one gets to claim port 631?

-James Butler

> [1] Actually, PBI might work just fine even for
> embedded if we address the disk bloat issue. =C2=A0One
> approach would be to make
>  =C2=A0 /Package/Bar/libfoo-2.8.7.so
> a symlink or hardlink to
>  =C2=A0 /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:
>  =C2=A0* Installer writes libfoo-2.8.7.so to
>  =C2=A0 =C2=A0 /Package/Shared/libfoo-2.8.7.so-temp-<PID of installer>
>  =C2=A0* Installer computes hash of file as it's written
>  =C2=A0* Installer renames file (delete if rename fails with EEXIST)
>  =C2=A0* Installer writes symlink or hardlink into /Package/Bar
>
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