981c287355
1) The wrapper erroneously used the ghc-pkg flag "--package-db" instead of
"--global-package-db". The result was that packages installed locally in
~/.ghc and ~/.cabal were invisible to GHC. This has been fixed.
2) The wrapper now deals gracefully with an empty package set: if no package
is requested to be included in the wrapped environment, the wrapper just
installs a pristine GHC.
3) Correctly configure the "docdir" path returned by ghc-paths.
4) Added some comments that describe the idea behind our ghc-paths patches and
gives users same sample shell code that can be used to import our special
environment variables into the currently running shell, so that programs
outside of the wrapped environment can use them, too.
71 lines
2.5 KiB
Nix
71 lines
2.5 KiB
Nix
{ stdenv, ghc, packages, buildEnv, makeWrapper, ignoreCollisions ? false }:
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# This wrapper works only with GHC 6.12 or later.
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assert stdenv.lib.versionOlder "6.12" ghc.version;
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# It's probably a good idea to include the library "ghc-paths" in the
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# compiler environment, because we have a specially patched version of
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# that package in Nix that honors these environment variables
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#
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# NIX_GHC
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# NIX_GHCPKG
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# NIX_GHC_DOCDIR
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# NIX_GHC_LIBDIR
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#
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# instead of hard-coding the paths. The wrapper sets these variables
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# appropriately to configure ghc-paths to point back to the wrapper
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# instead of to the pristine GHC package, which doesn't know any of the
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# additional libraries.
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#
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# A good way to import the environment set by the wrapper below into
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# your shell is to add the following snippet to your ~/.bashrc:
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#
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# if [ -e ~/.nix-profile/bin/ghc ]; then
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# eval $(grep export ~/.nix-profile/bin/ghc)
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# fi
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let
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ghc761OrLater = stdenv.lib.versionOlder "7.6.1" ghc.version;
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packageDBFlag = if ghc761OrLater then "--global-package-db" else "--global-conf";
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libDir = "$out/lib/ghc-${ghc.version}";
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docDir = "$out/share/doc/ghc/html";
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packageCfgDir = "${libDir}/package.conf.d";
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isHaskellPkg = x: (x ? pname) && (x ? version);
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in
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if packages == [] then ghc else
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buildEnv {
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name = "haskell-env-${ghc.name}";
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paths = stdenv.lib.filter isHaskellPkg (stdenv.lib.closePropagation packages) ++ [ghc];
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inherit ignoreCollisions;
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postBuild = ''
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. ${makeWrapper}/nix-support/setup-hook
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for prg in ghc ghci ghc-${ghc.version} ghci-${ghc.version}; do
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rm -f $out/bin/$prg
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makeWrapper ${ghc}/bin/$prg $out/bin/$prg \
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--add-flags '"-B$NIX_GHC_LIBDIR"' \
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--set "NIX_GHC" "$out/bin/ghc" \
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--set "NIX_GHCPKG" "$out/bin/ghc-pkg" \
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--set "NIX_GHC_DOCDIR" "${docDir}" \
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--set "NIX_GHC_LIBDIR" "${libDir}"
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done
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for prg in runghc runhaskell; do
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rm -f $out/bin/$prg
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makeWrapper ${ghc}/bin/$prg $out/bin/$prg \
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--add-flags "-f $out/bin/ghc" \
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--set "NIX_GHC" "$out/bin/ghc" \
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--set "NIX_GHCPKG" "$out/bin/ghc-pkg" \
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--set "NIX_GHC_DOCDIR" "${docDir}" \
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--set "NIX_GHC_LIBDIR" "${libDir}"
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done
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for prg in ghc-pkg ghc-pkg-${ghc.version}; do
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rm -f $out/bin/$prg
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makeWrapper ${ghc}/bin/$prg $out/bin/$prg --add-flags "${packageDBFlag}=${packageCfgDir}"
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done
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$out/bin/ghc-pkg recache
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'';
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}
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