Subject: Re: make update - wrong order?
To: None <firstname.lastname@example.org>
From: Geert Hendrickx <email@example.com>
Date: 10/03/2005 15:29:07
On Mon, Oct 03, 2005 at 02:11:59PM +0100, firstname.lastname@example.org wrote:
> On Mon, 3 Oct 2005 15:02:41 +0200
> Jeroen Ruigrok/asmodai <email@example.com> wrote:
> > -On [20051003 14:56], firstname.lastname@example.org (email@example.com) wrote:
> > >Maybe that's because you can have chains of dependancies:
> > >
> > >A->B->C->D
> > >
> > >So A depends on B, which depends on C, which depends on D
> > >To update A, you'd have to remove D, C, B in this order and rebuild them.
> > Wouldn't it be better to do:
> > build D, deinstall D, install D,
> > build C, deinstall C, install C,
> > et cetera?
> A_v1 -> B_v1 -> C_v1 -> D_v1
> where v<num> is the version number of a package
> If C_v1 depends on D_v1 and you build D_v2 then remove D_v1 and install D_v2,
> then C_v1 will break (possibly breaking dependant packages B_v1 and A_v1)
> Many packages include shared libraries, where version numbers are critical. If
> an application has been linked to a particular library and you remove that
> library and install a new (possibly incompatible) version, that application
> will not run properly, or it may run but crash randomly.
Ok, simpler case; say you're rebuilding a leaf-package (no other package
depends on it), then it would unarguably make more sense to
build/deinstall/reinstall, instead of deinstall/build/reinstall, because:
1) you can keep using the package _during_ the build
2) if the build breaks, you don't lose the original (working) package