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nixpkgs/pkgs/build-support/trivial-builders.nix
Matthew Bauer f194659ddb trivial-builders: disallow sub in requireFile
The requireFile call was being substituted from the binary cache. We
do not want this to happen as the user needs to download the file
themselves.
2018-06-26 21:49:08 -04:00

210 lines
6 KiB
Nix

{ lib, stdenv, stdenvNoCC, lndir }:
let
runCommand' = stdenv: name: env: buildCommand:
stdenv.mkDerivation ({
inherit name buildCommand;
passAsFile = [ "buildCommand" ];
} // env);
in
rec {
# Run the shell command `buildCommand' to produce a store path named
# `name'. The attributes in `env' are added to the environment
# prior to running the command.
runCommand = runCommandNoCC;
runCommandNoCC = runCommand' stdenvNoCC;
runCommandCC = runCommand' stdenv;
# Create a single file.
writeTextFile =
{ name # the name of the derivation
, text
, executable ? false # run chmod +x ?
, destination ? "" # relative path appended to $out eg "/bin/foo"
, checkPhase ? "" # syntax checks, e.g. for scripts
}:
runCommand name
{ inherit text executable;
passAsFile = [ "text" ];
# Pointless to do this on a remote machine.
preferLocalBuild = true;
allowSubstitutes = false;
}
''
n=$out${destination}
mkdir -p "$(dirname "$n")"
if [ -e "$textPath" ]; then
mv "$textPath" "$n"
else
echo -n "$text" > "$n"
fi
${checkPhase}
(test -n "$executable" && chmod +x "$n") || true
'';
# Shorthands for `writeTextFile'.
writeText = name: text: writeTextFile {inherit name text;};
writeTextDir = name: text: writeTextFile {inherit name text; destination = "/${name}";};
writeScript = name: text: writeTextFile {inherit name text; executable = true;};
writeScriptBin = name: text: writeTextFile {inherit name text; executable = true; destination = "/bin/${name}";};
# Create a Shell script, check its syntax
writeShellScriptBin = name : text :
writeTextFile {
inherit name;
executable = true;
destination = "/bin/${name}";
text = ''
#!${stdenv.shell}
${text}
'';
checkPhase = ''
${stdenv.shell} -n $out/bin/${name}
'';
};
# Create a C binary
writeCBin = name: code:
runCommandCC name
{
inherit name code;
executable = true;
passAsFile = ["code"];
# Pointless to do this on a remote machine.
preferLocalBuild = true;
allowSubstitutes = false;
}
''
n=$out/bin/$name
mkdir -p "$(dirname "$n")"
mv "$codePath" code.c
$CC -x c code.c -o "$n"
'';
# Create a forest of symlinks to the files in `paths'.
symlinkJoin =
args_@{ name
, paths
, preferLocalBuild ? true
, allowSubstitutes ? false
, postBuild ? ""
, ...
}:
let
args = removeAttrs args_ [ "name" "postBuild" ]
// { inherit preferLocalBuild allowSubstitutes; }; # pass the defaults
in runCommand name args
''
mkdir -p $out
for i in $paths; do
${lndir}/bin/lndir -silent $i $out
done
${postBuild}
'';
# Make a package that just contains a setup hook with the given contents.
makeSetupHook = { name ? "hook", deps ? [], substitutions ? {} }: script:
runCommand name substitutions
(''
mkdir -p $out/nix-support
cp ${script} $out/nix-support/setup-hook
'' + lib.optionalString (deps != []) ''
printWords ${toString deps} > $out/nix-support/propagated-build-inputs
'' + lib.optionalString (substitutions != {}) ''
substituteAll ${script} $out/nix-support/setup-hook
'');
# Write the references (i.e. the runtime dependencies in the Nix store) of `path' to a file.
writeReferencesToFile = path: runCommand "runtime-deps"
{
exportReferencesGraph = ["graph" path];
}
''
touch $out
while read path; do
echo $path >> $out
read dummy
read nrRefs
for ((i = 0; i < nrRefs; i++)); do read ref; done
done < graph
'';
# Quickly create a set of symlinks to derivations.
# entries is a list of attribute sets like { name = "name" ; path = "/nix/store/..."; }
linkFarm = name: entries: runCommand name { preferLocalBuild = true; }
("mkdir -p $out; cd $out; \n" +
(lib.concatMapStrings (x: "ln -s '${x.path}' '${x.name}';\n") entries));
# Print an error message if the file with the specified name and
# hash doesn't exist in the Nix store. Do not use this function; it
# produces packages that cannot be built automatically.
requireFile = { name ? null
, sha256 ? null
, sha1 ? null
, url ? null
, message ? null
, hashMode ? "flat"
} :
assert (message != null) || (url != null);
assert (sha256 != null) || (sha1 != null);
assert (name != null) || (url != null);
let msg =
if message != null then message
else ''
Unfortunately, we cannot download file ${name_} automatically.
Please go to ${url} to download it yourself, and add it to the Nix store
using either
nix-store --add-fixed ${hashAlgo} ${name_}
or
nix-prefetch-url --type ${hashAlgo} file:///path/to/${name_}
'';
hashAlgo = if sha256 != null then "sha256" else "sha1";
hash = if sha256 != null then sha256 else sha1;
name_ = if name == null then baseNameOf (toString url) else name;
in
stdenvNoCC.mkDerivation {
name = name_;
outputHashMode = hashMode;
outputHashAlgo = hashAlgo;
outputHash = hash;
preferLocalBuild = true;
allowSubstitutes = false;
builder = writeScript "restrict-message" ''
source ${stdenvNoCC}/setup
cat <<_EOF_
***
${msg}
***
_EOF_
exit 1
'';
};
# Copy a path to the Nix store.
# Nix automatically copies files to the store before stringifying paths.
# If you need the store path of a file, ${copyPathToStore <path>} can be
# shortened to ${<path>}.
copyPathToStore = builtins.filterSource (p: t: true);
# Copy a list of paths to the Nix store.
copyPathsToStore = builtins.map copyPathToStore;
}