Sender: =?UTF-8?Q?Timo_Ter=C3=A4s?= <timo.teras@gmail.com>
Date: Mon, 29 Oct 2012 20:43:43 +0200
From: Timo Teras <timo.teras@iki.fi>
To: Dubiousjim <lists+alpine-devel@jimpryor.net>
Cc: alpine-devel@lists.alpinelinux.org
Subject: Re: [alpine-devel] Questions about apk CMD -U
Message-ID: <20121029204343.501bef56@vostro>
In-Reply-To: <20121029181737.GB16841@vaio.jimpryor.net>
References: <20121029181737.GB16841@vaio.jimpryor.net>
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On Mon, 29 Oct 2012 14:17:37 -0400 Dubiousjim
<lists+alpine-devel@jimpryor.net> wrote:

> I'm doing some wiki cleanup, and have come across some issues I don't
> know the answer to. Can someone please clarify what is the EXACT
> effect of the -U/--update-cache flag for apk in each of the following
> circumstances:
> 
> 1. apk update -U (with an APK package cache enabled? without?)
> 2. apk add -U  (with an APK package cache enabled? without?)
> 3. apk upgrade -U (with an APK package cache enabled? without?)
> 
> I assume that the -U flag in cases 2 and 3 makes it unnecessary to
> first run an "apk update". Is that correct? Is the -U flag in case 1
> a no-op? Does the -U flag ever run an implicit "apk cache download",
> or anything of that sort?

the -U flag always does the one and same thing. It executes
 "apk update"
before running the real command.

So "apk update -U" is redundant and -U does there nothing.
 
> If anyone remembers at which earlier points in Alpine history the
> present behaviors became available, and what the preceding behavior
> was, that may also help with some wiki pages describing how to
> upgrade from older systems. For example, at which point could one
> begin relying on apk to upgrade apk-tools first, if necessary?

commit 59d222d - upgrade: perform upgrade of apk-tools first if available
is dated Sat Jan 1 15:48:10 2011 +0200 which is first included in
apk-tools version 2.1.0.

So the feature was first present in Alpine Linux 2.3.0_rc1.

If you are updating the apk-tools wiki page, please describe the package
"pinning" syntax too. This is the "apk add foo@edge" style syntax.

-Timo


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