Re: Update Hombrew install instructions on the web site

On 2 August 2015 at 17:23, Anders F Björklund <[email protected]> wrote:
> Thomas Leonard wrote:
>
>>> I made a test, and it seems that you still need to "init" the opamroot
>>> and it would need to download the "urls.txt" and the "index.tar.gz" ?
>>
>> If you've added the local clone of the repository, you can probably
>> remove the default one ("opam remote remove default"). That should
>> stop it trying to fetch any updates.
>
> Thanks for the hint about the opam-repository, makes it easy to get a
> snapshot of what opam modules were in fashion at the time of release...
>
> Actually I meant the case where I constructed an *empty* opamroot,
> just for the build. I think adding the repo there only makes it worse ?
>
> ==> opam init --no-setup
> [WARNING] /tmp/zero-install20150802-430-1707xb1/0install-2.8/opamroot exists
>            and is not empty
> Proceed ? [Y/n] y
>
> I pre-populated the "archives", which was why it was not empty.
>
>>> And I don't really want to go through the hassle of having to maintain
>>> all the dependencies, and update them if there's new versions etc etc.
>>
>> Yes, this does seem like an annoying requirement.
>
> But seems necessary, like in case of Lwt below ? Should be some way
> to "pin" opam to use the bundled libraries, if it can't stay offline.

If you delete from opam-repository all the versions you're not using,
it won't have any choice :-)

Or, you could add some exact version constraints to 0install's opam file.

> I know that I did this for the release, since the "sha" module didn't
> work with the older SDK (bug filed). Seems missing on Fedora as well ?
>
> Anyway, it happily ignored my archives and just went with the latest:
>
> ==> opam install yojson xmlm ounit react lwt extlib ocurl lablgtk sha
> The following actions will be performed:
>    ∗  install ocamlfind   1.5.5                                [required
> by xmlm, react, ocurl, etc.]
>    ∗  install camlp4      4.02+system                          [required
> by lablgtk, extlib, lwt]
>    ∗  install xmlm        1.2.0
>    ∗  install sha         1.9
>    ∗  install react       1.2.0
>    ∗  install ppx_tools   0.99.2                               [required
> by lwt]
>    ∗  install ounit       2.0.0
>    ∗  install easy-format 1.0.2                                [required
> by yojson]
>    ∗  install cppo        1.1.2                                [required
> by yojson]
>    ∗  install lablgtk     2.18.3
>    ∗  install extlib      1.6.1
>    ∗  install biniou      1.0.9                                [required
> by yojson]
>    ∗  install lwt         2.5.0
>    ∗  install yojson      1.2.1
>    ∗  install ocurl       0.7.5
> ===== ∗  15 =====
>
> Will see if I can't get it to install the ones that I provided instead.

You can specify versions like this:

opam install 'lwt=2.5.0'

But it might be easier to 'opam install 0install' and grab the binary
it produces.

> Preferrably I would have it just use the archives that I provided, but
> it seems that this is not the way that OPAM is supposed to be working.
>
>>> It ended up failing on some unicode issue, as it always seems to do...
>>> Same old string vs. bytes failure that we know and love from python3.
>>> Not sure if that's just a feature from ocaml 4.02.3 and opam 1.2.2 or not ?
>>> Seemed to work the last time I tried it. And what was with lwt <= 2.4.6 ?
>>
>> Lwt 2.4.7 changed a type from string to bytes I think, which broke the
>> build when using -safe-string:
>>
>>    https://github.com/ocaml/opam-repository/pull/3456
>
> Right, this was the error that I was seeing with the brew ocaml.
> Didn't see it for my earlier build, when using an older compiler.
>
> But if it had just used Lwt 2.4.6, then things would have worked ?
> Seems like another reason to note down the versions of each then.
>
>> Was fixed in the git version of 0install in Jan 2015. I should
>> probably make a new release at some point, but for now using the older
>> Lwt works. Or, you can apply this patch:
>>
>> https://github.com/0install/0install/commit/5b32a90ed160c3523a46addd747a9c45a49f56ec
>
> Ah, thank you. That makes much more sense, patching for newer then.
> Saw that you made the 2.9 release, but nice to have both of them...
>
> There is also a --HEAD version, that will use the 0install.git HEAD.
> Made that one use the locally installed (latest) opam modules too.
>
>
> Will push them soon, it seems to be working OK with "linuxbrew" too.
>
> Though I left obus out of the packaging, so it won't have PackageKit.
>
> /Anders
>
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-- 
Dr Thomas Leonard        http://roscidus.com/blog/
GPG: DA98 25AE CAD0 8975 7CDA  BD8E 0713 3F96 CA74 D8BA

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