Re: Check for file before installing
Re: Check for file before installing
- Subject: Re: Check for file before installing
- From: Jack Repenning <email@hidden>
- Date: Fri, 21 Sep 2007 12:32:44 -0700
On Sep 21, 2007, at 11:46 AM, Peter Bierman wrote:
While I agree that this situation makes life hard for the
installer, the Mac OS X Installer handles this as well as can be
expected. The OS itself installs many many files that overlap
between packages.
The consequences are that when multiple packages own the same file,
upgrading any one of those packages has the potential to replace or
remove that file, leaving the other packages in an inconsistent state.
When you know the circumstances of upgrading, you can work around
this issue. For example, with Annette's issue, if she replaces a
font that should exist anyway, then system upgrades will update or
replace that font as necessary.
Sure, I didn't mean to dis the Apple installer. But we're still --
inescapably, so far as I can see -- left with those potential
inconsistent states. If for example, Annette cares about this font
because she wants to use it (seems a safe guess!), and she wants to
use this particular font because its metrics make some tricky form
layout work better than any other font (wouldn't surprise me, given
her return address and implied product), then a change to the font
that altered the layout metrix (a thing outside her control, since
she doesn't actually own this font) would be a big deal for her: when
half her customers start complaining that the form lays out wrong,
she'll have a very hard time figuring out why it fails at all ("works
for me"), let alone why it only fails for half her customers.
-==-
Jack Repenning
email@hidden
Project Owner
SCPlugin
http://scplugin.tigris.org
"Subversion for the rest of OS X"
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