[Haskell-cafe] Building with some dependencies pre-installed in a sandbox
elliot.cameron at covenanteyes.com
Mon Feb 9 14:12:10 UTC 2015
It's certainly a hack, but one thing you can do is the following:
In your main package (the one which depends on your customization), simply set up a sandbox like this:
$ cd /home/me/my-package
$ cabal sandbox init
Then, in your custom mysql package, tell it to *share* a sandbox with "my-package" and then install it, like this:
$ cd /home/me/mysql-custom
$ cabal sandbox init --sandbox /home/me/my-package/.cabal-sandbox
$ cabal install
Now, back in "my-package", "cabal install --dependencies-only" will not re-download mysql. Make sure that your cabal config depends on the same package name and version that you have customized.
Hope this helps:
----- Original Message -----
From: "Miëtek Bak" <mietek at bak.io>
To: "Jakub Arnold" <darthdeus at gmail.com>
Cc: haskell-cafe at haskell.org
Sent: Saturday, February 7, 2015 9:50:08 PM
Subject: Re: [Haskell-cafe] Building with some dependencies pre-installed in a sandbox
It sounds like you’re looking for `cabal sandbox add-source`:
On 2015-02-08, at 02:33, Jakub Arnold <darthdeus at gmail.com> wrote:
> Hey guys, sorry for re-posting, but I feel that my original question is largely different from this one.
> I've managed to get my broken dependency to build (the mysql package), but unfortunately I had to manually change its source code to make this happen, (original post https://www.haskell.org/pipermail/haskell-cafe/2015-February/118064.html), but I do have the package installed locally (or in the sandbox of my app).
> The problem is that when I try to `cabal install` the whole application, it will re-download the `mysql` package from Hackage and try to build it again, instead of using the version I custom built and installed myself. Is it normal that cabal won't re-use the already existing packages, or did I somehow change it so that it won't recognize it?
> Also, is it possible to explicitly say where should cabal resolve some of its dependencies? Such as this case when one package is in a local path, and other should be built from hackage. I'm not really sure what the best approach is here.
> again sorry for posting twice in a row, but I just can't seem to find this information anywhere in the docs
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