Re: [Caml-list] Offline opam

[Anil Madhavapeddy <anil@recoil.org>]

In OPAM 1.2.2, you have to add a compilers/ directory to the repository
and point the 'src' field to a local network location; e.g. see this one for 4.03
https://github.com/ocaml/opam-repository/blob/master/compilers/4.03.0/4.03.0/4.03.0.comp

In OPAM 2dev, the OCaml compiler packages are no longer special cased
and are normal packages, and so they will be made available offline via
`opam admin` in exactly the same way as packages are now.

I've just published a set of OPAM2dev Docker images at:
https://hub.docker.com/r/ocaml/opam-dev/
with various distro and OCaml version combinations that might be useful if you
want to test-drive the functionality.

regards
Anil

> On 4 Oct 2016, at 17:09, Arlen Cox <arlencox@gmail.com> wrote:
> 
> Hi Anil,
> 
> There appears to be no issue installing packages, but switch does not
> seem to work.
> 
> 'opam switch 4.03' connects via http to download the compiler.  How do
> I make the compiler versions available offline as well?
> 
> Thanks,
> Arlen
> 
> On Tue, Oct 4, 2016 at 5:55 AM, Anil Madhavapeddy <anil@recoil.org> wrote:
>> On 3 Oct 2016, at 19:05, Arlen Cox <arlencox@gmail.com> wrote:
>>> 
>>> Hi all,
>>> 
>>> Is there good documentation anywhere on how to make an offline opam
>>> repo?  I would like to be able to use the repo just like I would opam
>>> with an internet connection.
>>> 
>>> I would like to be able to do the following:
>>> - Install any package: opam install package_x
>>> - Search for any package: opam search package_y
>>> - Switch the compiler (even if I have not yet installed that
>>> compiler version): opam switch 4.02.0
>>> 
>>> Using opam-admin make, I can cause all packages to be downloaded, but
>>> they're tagged with the compiler version that I used to fetch them.
>>> This means that if I run a switch, the existing archives are no longer
>>> valid (I presume).  Furthermore none of the ocaml compiler sources are
>>> downloaded, so I cannot actually use opam switch with this install.
>> 
>> Dear Arlen,
>> 
>> The OPAM archives generated by `opam admin make` should be
>> independent of the version of the compiler that has been selected.
>> They are placed in the archives/ directory of the remote so that you
>> can confirm this.
>> 
>> How is the issue manifesting that you are seeing -- is it definitely
>> failing to retrieve the package in just one switch?  If this is the case,
>> then an issue on https://github.com/ocaml/opam/issues would be
>> appreciated, with details on `opam remote` so that we can see how
>> you are accessing the local package.
>> 
>> OPAM should support complete offline access (assuming that package
>> builds themselves do not depend on the network), so the model you
>> want should work with OPAM 1.2.2.
>> 
>> regards
>> Anil
> 
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