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-rw-r--r--krebs/5pkgs/writers.nix304
1 files changed, 304 insertions, 0 deletions
diff --git a/krebs/5pkgs/writers.nix b/krebs/5pkgs/writers.nix
new file mode 100644
index 000000000..6e33a6507
--- /dev/null
+++ b/krebs/5pkgs/writers.nix
@@ -0,0 +1,304 @@
+{ pkgs, ... }:
+with import <stockholm/lib>;
+{
+ nixpkgs.config.packageOverrides = _: {
+ execve = name: { filename, argv ? null, envp ? {}, destination ? "" }: let
+ in pkgs.writeC name { inherit destination; } /* c */ ''
+ #include <unistd.h>
+
+ static char *const filename = ${toC filename};
+
+ ${if argv == null
+ then /* Propagate arguments */ /* c */ ''
+ #define MAIN_ARGS int argc, char **argv
+ ''
+ else /* Provide fixed arguments */ /* c */ ''
+ #define MAIN_ARGS void
+ static char *const argv[] = ${toC (argv ++ [null])};
+ ''}
+
+ static char *const envp[] = ${toC (
+ mapAttrsToList (k: v: "${k}=${v}") envp ++ [null]
+ )};
+
+ int main (MAIN_ARGS) {
+ execve(filename, argv, envp);
+ return -1;
+ }
+ '';
+
+ execveBin = name: cfg:
+ pkgs.execve name (cfg // { destination = "/bin/${name}"; });
+
+ makeScriptWriter = interpreter: name: text:
+ assert (with types; either absolute-pathname filename).check name;
+ pkgs.writeOut (baseNameOf name) {
+ ${optionalString (types.absolute-pathname.check name) name} = {
+ executable = true;
+ text = "#! ${interpreter}\n${text}";
+ };
+ };
+
+ writeBash = name: text:
+ assert (with types; either absolute-pathname filename).check name;
+ pkgs.writeOut (baseNameOf name) {
+ ${optionalString (types.absolute-pathname.check name) name} = {
+ check = pkgs.writeDash "shellcheck.sh" ''
+ ${pkgs.haskellPackages.ShellCheck}/bin/shellcheck "$1" || :
+ '';
+ executable = true;
+ text = "#! ${pkgs.bash}/bin/bash\n${text}";
+ };
+ };
+
+ writeBashBin = name:
+ assert types.filename.check name;
+ pkgs.writeBash "/bin/${name}";
+
+ writeC = name: { destination ? "" }: text: pkgs.runCommand name {
+ inherit text;
+ passAsFile = [ "text" ];
+ } /* sh */ ''
+ PATH=${makeBinPath (with pkgs; [
+ binutils
+ coreutils
+ gcc
+ ])}
+ exe=$out${destination}
+ mkdir -p "$(dirname "$exe")"
+ gcc -O -Wall -o "$exe" -x c "$textPath"
+ strip --strip-unneeded "$exe"
+ '';
+
+ writeDash = pkgs.makeScriptWriter "${pkgs.dash}/bin/dash";
+
+ writeDashBin = name:
+ assert types.filename.check name;
+ pkgs.writeDash "/bin/${name}";
+
+ writeEximConfig = name: text: pkgs.runCommand name {
+ inherit text;
+ passAsFile = [ "text" ];
+ } /* sh */ ''
+ # TODO validate exim config even with config.nix.useChroot == true
+ # currently doing so will fail because "user exim was not found"
+ #${pkgs.exim}/bin/exim -C "$textPath" -bV >/dev/null
+ mv "$textPath" $out
+ '';
+
+ writeOut = name: specs0:
+ let
+ writers.link =
+ { path
+ , link
+ }:
+ assert path == "" || types.absolute-pathname.check path;
+ assert types.package.check link;
+ {
+ install = /* sh */ ''
+ ${optionalString (dirOf path != "/") /* sh */ ''
+ ${pkgs.coreutils}/bin/mkdir -p $out${dirOf path}
+ ''}
+ ${pkgs.coreutils}/bin/ln -s ${link} $out${path}
+ '';
+ };
+
+ writers.text =
+ { path
+ , check ? null
+ , executable ? false
+ , mode ? if executable then "0755" else "0644"
+ , text
+ }:
+ assert path == "" || types.absolute-pathname.check path;
+ assert types.bool.check executable;
+ assert types.file-mode.check mode;
+ rec {
+ var = "file_${hashString "sha1" path}";
+ val = text;
+ install = /* sh */ ''
+ ${optionalString (check != null) /* sh */ ''
+ ${check} ''$${var}Path
+ ''}
+ ${pkgs.coreutils}/bin/install \
+ -m ${mode} \
+ -D \
+ ''$${var}Path $out${path}
+ '';
+ };
+
+ write = spec: writers.${spec.type} (removeAttrs spec ["type"]);
+
+ specs =
+ mapAttrsToList
+ (path: spec: let
+ known-types = [ "link" "text" ];
+ found-types = attrNames (getAttrs known-types spec);
+ type = assert length found-types == 1; head found-types;
+ in spec // { inherit path type; })
+ specs0;
+
+ files = map write specs;
+
+ filevars = genAttrs' (filter (hasAttr "var") files)
+ (spec: nameValuePair spec.var spec.val);
+
+ env = filevars // { passAsFile = attrNames filevars; };
+ in
+ pkgs.runCommand name env /* sh */ ''
+ set -efu
+ ${concatMapStringsSep "\n" (getAttr "install") files}
+ '';
+
+ writeHaskell =
+ k:
+ let
+ k' = parseDrvName k;
+ name = k'.name;
+ version = if k'.version != "" then k'.version else "0";
+ in
+ { base-depends ? ["base"]
+ , executables ? {}
+ , ghc-options ? ["-Wall" "-O3" "-threaded" "-rtsopts"]
+ , haskellPackages ? pkgs.haskellPackages
+ , library ? null
+ , license ? "WTFPL"
+ }:
+ let
+ isExecutable = executables != {};
+ isLibrary = library != null;
+
+ cabal-file = pkgs.writeText "${name}-${version}.cabal" /* cabal */ ''
+ build-type: Simple
+ cabal-version: >= 1.2
+ name: ${name}
+ version: ${version}
+ ${concatStringsSep "\n" (mapAttrsToList exe-section executables)}
+ ${optionalString isLibrary (lib-section library)}
+ '';
+
+ exe-install =
+ exe-name:
+ { file ? pkgs.writeText "${name}-${exe-name}.hs" text
+ , relpath ? "${exe-name}.hs"
+ , text
+ , ... }:
+ if types.filename.check exe-name
+ then /* sh */ "install -D ${file} $out/${relpath}"
+ else throw "argument ‘exe-name’ is not a ${types.filename.name}";
+
+ exe-section =
+ exe-name:
+ { build-depends ? base-depends ++ extra-depends
+ , extra-depends ? []
+ , file ? pkgs.writeText "${name}-${exe-name}.hs" text
+ , relpath ? "${exe-name}.hs"
+ , text
+ , ... }: /* cabal */ ''
+ executable ${exe-name}
+ build-depends: ${concatStringsSep "," build-depends}
+ ghc-options: ${toString ghc-options}
+ main-is: ${relpath}
+ '';
+
+ get-depends =
+ { build-depends ? base-depends ++ extra-depends
+ , extra-depends ? []
+ , ...
+ }:
+ build-depends;
+
+ lib-install =
+ { exposed-modules
+ , ... }:
+ concatStringsSep "\n" (mapAttrsToList mod-install exposed-modules);
+
+ lib-section =
+ { build-depends ? base-depends ++ extra-depends
+ , extra-depends ? []
+ , exposed-modules
+ , ... }: /* cabal */ ''
+ library
+ build-depends: ${concatStringsSep "," build-depends}
+ ghc-options: ${toString ghc-options}
+ exposed-modules: ${concatStringsSep "," (attrNames exposed-modules)}
+ '';
+
+ mod-install =
+ mod-name:
+ { file ? pkgs.writeText "${name}-${mod-name}.hs" text
+ , relpath ? "${replaceStrings ["."] ["/"] mod-name}.hs"
+ , text
+ , ... }:
+ if types.haskell.modid.check mod-name
+ then /* sh */ "install -D ${file} $out/${relpath}"
+ else throw "argument ‘mod-name’ is not a ${types.haskell.modid.name}";
+ in
+ haskellPackages.mkDerivation {
+ inherit isExecutable isLibrary license version;
+ executableHaskellDepends =
+ attrVals
+ (concatMap get-depends (attrValues executables))
+ haskellPackages;
+ libraryHaskellDepends =
+ attrVals
+ (optionals isLibrary (get-depends library))
+ haskellPackages;
+ pname = name;
+ src = pkgs.runCommand "${name}-${version}-src" {} /* sh */ ''
+ install -D ${cabal-file} $out/${cabal-file.name}
+ ${optionalString isLibrary (lib-install library)}
+ ${concatStringsSep "\n" (mapAttrsToList exe-install executables)}
+ '';
+ };
+
+ writeJq = name: text: pkgs.runCommand name {
+ inherit text;
+ passAsFile = [ "text" ];
+ } /* sh */ ''
+ name=${assert types.filename.check name; name}
+
+ # syntax check
+ ${pkgs.jq}/bin/jq -f "$textPath" -n
+
+ cp "$textPath" "$out"
+ '';
+
+ writeJSON = name: value: pkgs.writeText name (toJSON value);
+
+ writeNixFromCabal =
+ trace (toString [
+ "The function `writeNixFromCabal` has been deprecated in favour of"
+ "`writeHaskell`."
+ ])
+ (name: path: pkgs.runCommand name {} /* sh */ ''
+ ${pkgs.cabal2nix}/bin/cabal2nix ${path} > $out
+ '');
+
+ writePython2 = name: text: pkgs.runCommand name {
+ inherit text;
+ passAsFile = [ "text" ];
+ } /* sh */ ''
+ name=${assert types.filename.check name; name}
+
+ # syntax check
+ ${pkgs.python2}/bin/python -m py_compile "$textPath"
+
+ cp "$textPath" "$out"
+ '';
+
+ writePython3 = name: text: pkgs.runCommand name {
+ inherit text;
+ passAsFile = [ "text" ];
+ } /* sh */ ''
+ name=${assert types.filename.check name; name}
+
+ # syntax check
+ ${pkgs.python3}/bin/python -m py_compile "$textPath"
+
+ cp "$textPath" "$out"
+ '';
+
+ writeSed = pkgs.makeScriptWriter "${pkgs.gnused}/bin/sed -f";
+ };
+}