[opam-devel] shared directory

[Sean McLaughlin]

I'm installing elisp files.  What would you tell the user to put in their
.emacs?
This is Louis' proposal:

(setq path-to-opam-shared
  (replace-regexp-in-string "\n" "" (shell-command-to-string "opam config
var share")))

It would be nicer to do

(setq path-to-opam-shared "~/.opam/current/shared")

What is opam exec?

$ opam --version
1.1.0
$ opam exec
opam: unknown command `exec'
Usage: opam COMMAND ...
Try `opam --help' for more information.
EXIT STATUS 1




On Wed, Nov 20, 2013 at 7:17 PM, Anil Madhavapeddy <anil at recoil.org> wrote:

> It breaks the nice property that you can start a shell with "opam exec"
> and have it do the right thing with respect to dependent tools.  If your
> scripts depend on an environment variable, then they'll work, but a symlink
> approach isn't quite as flexible.
>
> Having said that, if people think that the symlink is really convenient
> and don't care about `opam exec`, I have no objection to a symlink being
> maintained.
>
> -anil
>
> On 20 Nov 2013, at 13:53, Louis Gesbert <louis.gesbert at ocamlpro.com>
> wrote:
>
> Updating a symlink whenever you do `opam switch` wouldn't be too much of a
> problem indeed. What I am concerned about is that people may start using it
> from opam, which would break when the OPAMROOT and --root opam options are
> used.
>
>
> But perhaps I am being too cautious ? I'm myself using a ~/opam link
> pointing to ~/.opam/4.01.0 ...
>
>
> Best,
> Louis
>
>
> Le lundi 18 novembre 2013 10:17:56 Sean McLaughlin a écrit :
> > Hi Louis,
> >
> > What are the issues to using a symlink? Couldn't opam switch just move it
> > around?
> >
> > Best,
> >
> > Sean
> >
> >
> > On Mon, Nov 18, 2013 at 3:30 AM, Louis Gesbert
> > <louis.gesbert at ocamlpro.com>wrote:
> >
> > > Le dimanche 17 novembre 2013 16:54:15 Sean McLaughlin a écrit :
> > >
> > > > I'm trying to package a library that installs files in share. When I
> had
> > >
> > > > only one compiler installed, the %{prefix}% argument sent them to
> > >
> > > > .opam/system/share. However, when I installed another compiler and
> made
> > > it
> > >
> > > > current, the files went into .opam/4.00.1/share. I am trying to tell
> the
> > >
> > > > user where to find the files. Is there a generic directory where I
> could
> > >
> > > > point the user? Perhaps you could make a symlink 'current' for the
> > >
> > > > current compiler?
> > >
> > >
> > >
> > > You should use $(opam config var prefix)/share, or even $(opam config
> var
> > > share). A symlink could be an option worth considering, but it has its
> own
> > > issues.
> > >
> > >
> > >
> > > Best,
> > >
> > > Louis
> > >
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