[Caml-list] Opam: using both 1.2 and 2.0

[Caml-list] Opam: using both 1.2 and 2.0

[Sébastien Hinderer]

Dear all,

Although Debian now ships Opam 2.0, I'd like to also be able to use Opam
1.2 because one of the projects I'd like to work on still uses that version
of Opam.

Is there a suggested way to achieve this?

I am considering using an older Debian in a chroot but am wondering
whether a lighter solution would be available?

Best wishes,

Sébastien.

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Re: [Caml-list] Opam: using both 1.2 and 2.0

[Daniel Bünzli]

On 7 January 2019 at 09:12:12, Sébastien Hinderer (sebastien.hinderer@inria.fr) wrote:

> Is there a suggested way to achieve this?

I guess the easiest would be to make a wrapper shell script for opam v1.2 that sets OPAMROOT to a place where it can operate without disturbing your opam v2 install. 

Best, 

Daniel





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Re: [Caml-list] Opam: using both 1.2 and 2.0

[Sébastien Hinderer]

Daniel Bünzli (2019/01/07 10:22 +0100):
> On 7 January 2019 at 09:12:12, Sébastien Hinderer (sebastien.hinderer@inria.fr) wrote:
> 
> > Is there a suggested way to achieve this?
> 
> I guess the easiest would be to make a wrapper shell script for opam
> v1.2 that sets OPAMROOT to a place where it can operate without
> disturbing your opam v2 install. 

Will try that! Thanks! But still have to figure out how to install opam
1 I guess, because it will probably not be possible to install it
through the distribution's package manager.

Best wishes,

Sébastien.

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Re: [Caml-list] Opam: using both 1.2 and 2.0

[Daniel Bünzli]

On 7 January 2019 at 10:25:10, Sébastien Hinderer (sebastien.hinderer@inria.fr) wrote:

> Will try that! Thanks! But still have to figure out how to install opam
> 1 I guess, because it will probably not be possible to install it
> through the distribution's package manager.

opam dev's are kind enough to provide you with a selection of binaries here: 

  https://github.com/ocaml/opam/releases/tag/1.2.2

I never tried them though. Otherwise given an OCaml install, compiling from the tarball should be easy has never been a problem since it's self-contained.

Best,

Daniel



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Re: [Caml-list] Opam: using both 1.2 and 2.0

[Jacques Garrigue]

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Actually I'm always using those binaries.
It's simpler than going through another package manager which may be late
to update, and you just have to install one file in your path.

Jacques

2019年1月7日(月) 18:52、Daniel Bünzli さん（daniel.buenzli@erratique.ch）のメッセージ:

> On 7 January 2019 at 10:25:10, Sébastien Hinderer (
> sebastien.hinderer@inria.fr) wrote:
>
> > Will try that! Thanks! But still have to figure out how to install opam
> > 1 I guess, because it will probably not be possible to install it
> > through the distribution's package manager.
>
> opam dev's are kind enough to provide you with a selection of binaries
> here:
>
>   https://github.com/ocaml/opam/releases/tag/1.2.2
>
> I never tried them though. Otherwise given an OCaml install, compiling
> from the tarball should be easy has never been a problem since it's
> self-contained.
>
> Best,
>
> Daniel
>
>
>
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Re: [Caml-list] Opam: using both 1.2 and 2.0

[Sébastien Hinderer]

Hi,

Daniel Bünzli (2019/01/07 10:52 +0100):
> On 7 January 2019 at 10:25:10, Sébastien Hinderer (sebastien.hinderer@inria.fr) wrote:
> 
> > Will try that! Thanks! But still have to figure out how to install opam
> > 1 I guess, because it will probably not be possible to install it
> > through the distribution's package manager.
> 
> opam dev's are kind enough to provide you with a selection of binaries here: 
> 
>   https://github.com/ocaml/opam/releases/tag/1.2.2
> 
> I never tried them though. Otherwise given an OCaml install, compiling
> from the tarball should be easy has never been a problem since it's
> self-contained.

I just wanted to thank you for the suggestion and confirm that it worked
quite well. I downloaded the binary for my platform and installed it in my
private bin directory as 'opam1'. When I want to use it, rather than the
system-provided opam (version 2), I create a symlink in my bin
directory.

Then I just had to do:

opam init --root=~/.opam1

and everything wored fine.

Bets wishes,

Sébastien.

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Re: [Caml-list] Opam: using both 1.2 and 2.0

[Anil Madhavapeddy]

On 21 Jan 2019, at 14:54, Sébastien Hinderer <Sebastien.Hinderer@inria.fr> wrote:
> 
> Hi,
> 
> Daniel Bünzli (2019/01/07 10:52 +0100):
>> On 7 January 2019 at 10:25:10, Sébastien Hinderer (sebastien.hinderer@inria.fr) wrote:
>> 
>>> Will try that! Thanks! But still have to figure out how to install opam
>>> 1 I guess, because it will probably not be possible to install it
>>> through the distribution's package manager.
>> 
>> opam dev's are kind enough to provide you with a selection of binaries here: 
>> 
>>   https://github.com/ocaml/opam/releases/tag/1.2.2
>> 
>> I never tried them though. Otherwise given an OCaml install, compiling
>> from the tarball should be easy has never been a problem since it's
>> self-contained.
> 
> I just wanted to thank you for the suggestion and confirm that it worked
> quite well. I downloaded the binary for my platform and installed it in my
> private bin directory as 'opam1'. When I want to use it, rather than the
> system-provided opam (version 2), I create a symlink in my bin
> directory.
> 
> Then I just had to do:
> 
> opam init --root=~/.opam1
> 
> and everything wored fine.
> 

Excellent, glad to hear that’s working for you now!

In the medium-term, please do let us opam developers know if there is
some fundamental reason why you cannot migrate your projects from
opam 1 to 2.  We will do our best to unblock it in opam 2, since we
can’t fully leave opam 1 behind until the last user has closed the door
behind them :-)

regards,
Anil


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Re: [Caml-list] Opam: using both 1.2 and 2.0

[Hendrik Boom]

On Mon, Jan 07, 2019 at 10:25:10AM +0100, Sébastien Hinderer wrote:
> Daniel Bünzli (2019/01/07 10:22 +0100):
> > On 7 January 2019 at 09:12:12, Sébastien Hinderer (sebastien.hinderer@inria.fr) wrote:
> > 
> > > Is there a suggested way to achieve this?
> > 
> > I guess the easiest would be to make a wrapper shell script for opam
> > v1.2 that sets OPAMROOT to a place where it can operate without
> > disturbing your opam v2 install. 
> 
> Will try that! Thanks! But still have to figure out how to install opam
> 1 I guess, because it will probably not be possible to install it
> through the distribution's package manager.

You could try dowloading the .deb from an older Deboan release and using dpkg.
That's if the package depedencies haven't changed much.

Or you could try edit /etc/apt/sources.lst,
    apt-get update, 
    apt-get-install opam
and then put sources.lst back the way it was and
    apt-get update
again.

That requires the old dependencies not to conflict with the new ones.  

And in any case you'd probably have to move the old opam binary before 
you reinstall the new one.

-- hendrik

> 
> Best wishes,
> 
> Sébastien.
> 
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Re: [Caml-list] Opam: using both 1.2 and 2.0

[Sébastien Hinderer]

Hi,

May thanks for your response.

> You could try dowloading the .deb from an older Deboan release and using dpkg.
> That's if the package depedencies haven't changed much.
> 
> Or you could try edit /etc/apt/sources.lst,
>     apt-get update, 
>     apt-get-install opam
> and then put sources.lst back the way it was and
>     apt-get update
> again.
> 
> That requires the old dependencies not to conflict with the new ones.

I don't think that would work because dpkg wouldn't let you intall two
packages with the exact same name.

But that's okay, I'll figure something out and report back here, thanks.

Sébastien.

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