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abc4f961b4
This closes #79441. ghcWithPackages is using `ghc-pkg recache` to build its package database. By doing so, it overrides the `package.cache[.lock]` files. Details are unclear, but GHC 8.10 changed a bit the behavior. Previously, it was unconditionally replacing the files by new ones. Now it tries to open (for modification) the files. These files are symlinks to another nix derivation, which is hence read-only. This commit removes the files before running `ghc-pkg recache`, hence it will just write the new files. Tested with `haskellPackages.ghcWithPackages` (i.e. GHC 8.8) and `haskell.packages.ghc8101.ghcWithPackages` (i.e GHC 8.10) with the following nix file, at the root of the nixpkgs repository: ``` with import ./. { overlays = [ ( self: super: { haskellPackages = super.haskell.packages.ghc8101.override { overrides = selfh: superh: { th-lift-instances = super.haskell.lib.doJailbreak superh.th-lift-instances; th-expand-syns = super.haskell.lib.doJailbreak superh.th-expand-syns; th-reify-many = super.haskell.lib.doJailbreak superh.th-reify-many; th-orphans = super.haskell.lib.doJailbreak superh.th-orphans; haskell-src-meta = super.haskell.lib.doJailbreak superh.haskell-src-meta; }; }; } ) ]; }; haskellPackages.ghcWithPackages(p:[p.PyF]) ``` This will test with GHC 8.10. Comment out the `overlays` to test with GHC 8.8.
155 lines
6.5 KiB
Nix
155 lines
6.5 KiB
Nix
{ lib, stdenv, ghc, llvmPackages, packages, symlinkJoin, makeWrapper
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, withLLVM ? false
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, postBuild ? ""
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, ghcLibdir ? null # only used by ghcjs, when resolving plugins
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}:
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assert ghcLibdir != null -> (ghc.isGhcjs or false);
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# This wrapper works only with GHC 6.12 or later.
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assert lib.versionOlder "6.12" ghc.version || ghc.isGhcjs || ghc.isHaLVM;
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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 $(grep export ~/.nix-profile/bin/ghc)
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# fi
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let
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isGhcjs = ghc.isGhcjs or false;
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isHaLVM = ghc.isHaLVM or false;
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ghc761OrLater = isGhcjs || isHaLVM || lib.versionOlder "7.6.1" ghc.version;
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packageDBFlag = if ghc761OrLater then "--global-package-db" else "--global-conf";
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ghcCommand' = if isGhcjs then "ghcjs" else "ghc";
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ghcCommand = "${ghc.targetPrefix}${ghcCommand'}";
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ghcCommandCaps= lib.toUpper ghcCommand';
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libDir = if isHaLVM then "$out/lib/HaLVM-${ghc.version}"
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else "$out/lib/${ghcCommand}-${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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paths = lib.filter (x: x ? isHaskellLibrary) (lib.closePropagation packages);
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hasLibraries = lib.any (x: x.isHaskellLibrary) paths;
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# CLang is needed on Darwin for -fllvm to work:
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# https://downloads.haskell.org/~ghc/latest/docs/html/users_guide/codegens.html#llvm-code-generator-fllvm
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llvm = lib.makeBinPath
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([ llvmPackages.llvm ]
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++ lib.optional stdenv.targetPlatform.isDarwin llvmPackages.clang);
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in
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if paths == [] && !withLLVM then ghc else
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symlinkJoin {
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# this makes computing paths from the name attribute impossible;
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# if such a feature is needed, the real compiler name should be saved
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# as a dedicated drv attribute, like `compiler-name`
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name = ghc.name + "-with-packages";
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paths = paths ++ [ghc];
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postBuild = ''
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. ${makeWrapper}/nix-support/setup-hook
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# wrap compiler executables with correct env variables
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for prg in ${ghcCommand} ${ghcCommand}i ${ghcCommand}-${ghc.version} ${ghcCommand}i-${ghc.version}; do
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if [[ -x "${ghc}/bin/$prg" ]]; then
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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$NIX_${ghcCommandCaps}_LIBDIR"' \
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--set "NIX_${ghcCommandCaps}" "$out/bin/${ghcCommand}" \
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--set "NIX_${ghcCommandCaps}PKG" "$out/bin/${ghcCommand}-pkg" \
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--set "NIX_${ghcCommandCaps}_DOCDIR" "${docDir}" \
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--set "NIX_${ghcCommandCaps}_LIBDIR" "${libDir}" \
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${lib.optionalString (ghc.isGhcjs or false)
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''--set NODE_PATH "${ghc.socket-io}/lib/node_modules"''
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} \
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${lib.optionalString withLLVM ''--prefix "PATH" ":" "${llvm}"''}
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fi
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done
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for prg in runghc runhaskell; do
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if [[ -x "${ghc}/bin/$prg" ]]; then
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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 $out/bin/${ghcCommand}" \
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--set "NIX_${ghcCommandCaps}" "$out/bin/${ghcCommand}" \
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--set "NIX_${ghcCommandCaps}PKG" "$out/bin/${ghcCommand}-pkg" \
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--set "NIX_${ghcCommandCaps}_DOCDIR" "${docDir}" \
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--set "NIX_${ghcCommandCaps}_LIBDIR" "${libDir}"
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fi
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done
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for prg in ${ghcCommand}-pkg ${ghcCommand}-pkg-${ghc.version}; do
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if [[ -x "${ghc}/bin/$prg" ]]; then
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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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fi
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done
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# haddock was referring to the base ghc, https://github.com/NixOS/nixpkgs/issues/36976
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if [[ -x "${ghc}/bin/haddock" ]]; then
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rm -f $out/bin/haddock
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makeWrapper ${ghc}/bin/haddock $out/bin/haddock \
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--add-flags '"-B$NIX_${ghcCommandCaps}_LIBDIR"' \
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--set "NIX_${ghcCommandCaps}_LIBDIR" "${libDir}"
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fi
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'' + (lib.optionalString (stdenv.targetPlatform.isDarwin && !isGhcjs && !stdenv.targetPlatform.isiOS) ''
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# Work around a linker limit in macOS Sierra (see generic-builder.nix):
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local packageConfDir="$out/lib/${ghc.name}/package.conf.d";
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local dynamicLinksDir="$out/lib/links"
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mkdir -p $dynamicLinksDir
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# Clean up the old links that may have been (transitively) included by
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# symlinkJoin:
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rm -f $dynamicLinksDir/*
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for d in $(grep dynamic-library-dirs $packageConfDir/*|awk '{print $2}'|sort -u); do
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ln -s $d/*.dylib $dynamicLinksDir
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done
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for f in $packageConfDir/*.conf; do
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# Initially, $f is a symlink to a read-only file in one of the inputs
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# (as a result of this symlinkJoin derivation).
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# Replace it with a copy whose dynamic-library-dirs points to
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# $dynamicLinksDir
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cp $f $f-tmp
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rm $f
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sed "s,dynamic-library-dirs: .*,dynamic-library-dirs: $dynamicLinksDir," $f-tmp > $f
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rm $f-tmp
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done
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'') + ''
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${lib.optionalString hasLibraries ''
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# GHC 8.10 changes.
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# Instead of replacing package.cache[.lock] with the new file,
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# ghc-pkg is now trying to open the file. These file are symlink
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# to another nix derivation, so they are not writable. Removing
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# them allow the correct behavior of ghc-pkg recache
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# See: https://github.com/NixOS/nixpkgs/issues/79441
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rm $out/lib/${ghc.name}/package.conf.d/package.cache.lock
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rm $out/lib/${ghc.name}/package.conf.d/package.cache
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$out/bin/${ghcCommand}-pkg recache
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''}
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${# ghcjs will read the ghc_libdir file when resolving plugins.
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lib.optionalString (isGhcjs && ghcLibdir != null) ''
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mkdir -p "${libDir}"
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rm -f "${libDir}/ghc_libdir"
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printf '%s' '${ghcLibdir}' > "${libDir}/ghc_libdir"
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''}
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$out/bin/${ghcCommand}-pkg check
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'' + postBuild;
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passthru = {
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preferLocalBuild = true;
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inherit (ghc) version meta;
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};
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}
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