135 lines
4 KiB
Nix
135 lines
4 KiB
Nix
{ stdenv, lndir }:
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rec {
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# Run the shell command `buildCommand' to produce a store path named
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# `name'. The attributes in `env' are added to the environment
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# prior to running the command.
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runCommand = name: env: buildCommand:
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stdenv.mkDerivation ({
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inherit name buildCommand;
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} // env);
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# Create a single file.
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writeTextFile =
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{ name # the name of the derivation
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, text
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, executable ? false # run chmod +x ?
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, destination ? "" # relative path appended to $out eg "/bin/foo"
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}:
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runCommand name {inherit text executable; }
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''
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n=$out${destination}
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mkdir -p "$(dirname "$n")"
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echo -n "$text" > "$n"
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(test -n "$executable" && chmod +x "$n") || true
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'';
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# Shorthands for `writeTextFile'.
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writeText = name: text: writeTextFile {inherit name text;};
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writeScript = name: text: writeTextFile {inherit name text; executable = true;};
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writeScriptBin = name: text: writeTextFile {inherit name text; executable = true; destination = "/bin/${name}";};
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# Create a forest of symlinks to the files in `paths'.
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symlinkJoin = name: paths:
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runCommand name { inherit paths; }
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''
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mkdir -p $out
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for i in $paths; do
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${lndir}/bin/lndir $i $out
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done
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'';
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# Make a package that just contains a setup hook with the given contents.
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makeSetupHook = { deps ? [], substitutions ? {} }: script:
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runCommand "hook" substitutions
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(''
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mkdir -p $out/nix-support
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cp ${script} $out/nix-support/setup-hook
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'' + stdenv.lib.optionalString (deps != []) ''
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echo ${toString deps} > $out/nix-support/propagated-build-native-inputs
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'' + stdenv.lib.optionalString (substitutions != {}) ''
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substituteAll ${script} $out/nix-support/setup-hook
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'');
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# Write the references (i.e. the runtime dependencies in the Nix store) of `path' to a file.
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writeReferencesToFile = path: runCommand "runtime-deps"
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{
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exportReferencesGraph = ["graph" path];
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}
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''
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touch $out
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while read path; do
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echo $path >> $out
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read dummy
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read nrRefs
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for ((i = 0; i < nrRefs; i++)); do read ref; done
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done < graph
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'';
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# Quickly create a set of symlinks to derivations.
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# entries is a list of attribute sets like { name = "name" ; path = "/nix/store/..."; }
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linkFarm = name: entries: runCommand name {} ("mkdir -p $out; cd $out; \n" +
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(stdenv.lib.concatMapStrings (x: "ln -s '${x.path}' '${x.name}';\n") entries));
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# Require file
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requireFile = {name, sha256, url ? null, message ? null} :
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assert (message != null) || (url != null);
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let msg =
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if message != null then message
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else ''
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Unfortunately, we may not download file ${name} automatically.
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Please, go to ${url}, download it yourself, and add it to the Nix store
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using either
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nix-store --add-fixed sha256 ${name}
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or
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nix-prefetch-url file://path/to/${name}
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'';
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in
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stdenv.mkDerivation {
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inherit name;
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outputHashAlgo = "sha256";
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outputHash = sha256;
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builder = writeScript "restrict-message" ''
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source ${stdenv}/setup
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cat <<_EOF_
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***
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${msg}
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***
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_EOF_
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'';
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};
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# Search in the environment if the same program exists with a set uid or
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# set gid bit. If it exists, run the first program found, otherwise run
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# the default binary.
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useSetUID = drv: path:
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let
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name = baseNameOf path;
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bin = "${drv}${path}";
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in assert name != "";
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writeScript "setUID-${name}" ''
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#!${stdenv.shell}
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inode=$(stat -Lc %i ${bin})
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for file in $(type -ap ${name}); do
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case $(stat -Lc %a $file) in
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([2-7][0-7][0-7][0-7])
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if test -r "$file".real; then
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orig=$(cat "$file".real)
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if test $inode = $(stat -Lc %i "$orig"); then
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exec "$file" "$@"
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fi
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fi;;
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esac
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done
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exec ${bin} "$@"
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'';
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}
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