[Caml-list] How to properly do "opam switch"?

[Caml-list] How to properly do "opam switch"?

[Ian Zimmerman]

After I do "opam switch 4.02.1" and perform the environment
incantations, 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

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?

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Re: [Caml-list] How to properly do "opam switch"?

[Francois Berenger]

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.

Re: [Caml-list] How to properly do "opam switch"?

[Amir Chaudhry]

On 14 Nov 2014, at 09:15, Francois Berenger <francois.berenger@inria.fr> wrote:

> 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

There's some more information about opam switch on the website, which people might find useful.

opam switch: https://opam.ocaml.org/doc/Usage.html#opamswitch
FAQ: https://opam.ocaml.org/doc/FAQ.html#Whatisaquotswitchquot (and the two questions immediately after it)

Amir