From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <francois.berenger@inria.fr>
Received: from mail3-relais-sop.national.inria.fr (mail3-relais-sop.national.inria.fr [192.134.164.104])
	by sympa.inria.fr (Postfix) with ESMTPS id 25DC07FAED
	for <caml-list@sympa.inria.fr>; Fri, 14 Nov 2014 10:15:47 +0100 (CET)
X-IronPort-AV: E=Sophos;i="5.07,384,1413237600"; 
   d="scan'208";a="88110264"
Received: from meleze.ens.fr (HELO [129.199.99.114]) ([129.199.99.114])
  by mail3-relais-sop.national.inria.fr with ESMTP/TLS/DHE-RSA-AES128-SHA; 14 Nov 2014 10:15:46 +0100
Message-ID: <5465C842.6000103@inria.fr>
Date: Fri, 14 Nov 2014 10:15:46 +0100
From: Francois Berenger <francois.berenger@inria.fr>
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.2.0
MIME-Version: 1.0
To: caml-list@inria.fr
References: <20141113154028.0ae9e90c.itz@buug.org>
In-Reply-To: <20141113154028.0ae9e90c.itz@buug.org>
Content-Type: text/plain; charset=windows-1252; format=flowed
Content-Transfer-Encoding: 7bit
Subject: Re: [Caml-list] How to properly do "opam switch"?

On 11/14/2014 12:40 AM, Ian Zimmerman wrote:
> After I do "opam switch 4.02.1" and perform the environment
> incantations,

# I guess you mean:
opam switch 4.02.1
eval `opam config env`

 > I have a new subtree ~/.opam/4.02.1 with its own bin, man
> etc. subdirs, and my environment variables now point to it:
>
>   [26+0]~$ env | fgrep -i opam
> CAML_LD_LIBRARY_PATH=/home/itz/.opam/4.02.1/lib/stublibs
> MANPATH=:/home/itz/.opam/4.02.1/man:/opt/posix/man
> PERL5LIB=/home/itz/.opam/4.02.1/lib/perl5
> OCAML_TOPLEVEL_PATH=/home/itz/.opam/4.02.1/lib/toplevel
> PATH=/home/itz/HOL/bin:/home/itz/.cabal/bin:/home/itz/.opam/4.02.1/bin:/home/itz/eclipse:/home/itz/src/makefiles:/home/itz/.share/bin:/home/itz/bin:/usr/lib/ccache:/opt/ghc/7.8.3/bin:/usr/local/bin:/usr/bin:/bin:/usr/games
> OPAMKEEPBUILDDIR=y
> OPAMCOLOR=never
>
> Unfortunately, this subtree contains _only_ the compiler, and no other
> packages from the earlier (4.01.0) subtree.  In particular, not opam
> itself!  That means I cannot

opam is not installed by opam.

If you mean you want all of your previously installed packages,
you can do that (using the previous switch you were using):

opam switch export file.export
opam switch 4.02.1
eval `opam config env`
opam switch import file.export

> a. recompile any packages with opam, or even
>
> b. get documentation on how to get out of this state :-P
>
> What is the proper way to handle this, as I must have missed it?

-- 
Regards,
Francois.