nix develop: Don't parse bash environment with regexes
Instead have get-env.sh dump the bash environment as JSON. This should be a lot less error-prone. Fixes #4992.
This commit is contained in:
Eelco Dolstra
parent
b1cfe8f984
commit
b1f1347ade
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@ -8,7 +8,7 @@
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#include "affinity.hh"
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#include "progress-bar.hh"
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#include <regex>
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#include <nlohmann/json.hpp>
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using namespace nix;
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@ -25,20 +25,24 @@ static DevelopSettings developSettings;
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static GlobalConfig::Register rDevelopSettings(&developSettings);
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struct Var
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{
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bool exported = true;
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bool associative = false;
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std::string quoted; // quoted string or array
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};
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struct BuildEnvironment
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{
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std::map<std::string, Var> env;
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std::string bashFunctions;
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struct String
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{
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bool exported;
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std::string value;
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};
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BuildEnvironment readEnvironment(const Path & path)
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using Array = std::vector<std::string>;
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using Associative = std::map<std::string, std::string>;
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using Value = std::variant<String, Array, Associative>;
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std::map<std::string, Value> vars;
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std::map<std::string, std::string> bashFunctions;
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static BuildEnvironment fromJSON(const Path & path)
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{
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BuildEnvironment res;
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@ -46,74 +50,74 @@ BuildEnvironment readEnvironment(const Path & path)
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debug("reading environment file '%s'", path);
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auto file = readFile(path);
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auto json = nlohmann::json::parse(readFile(path));
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auto pos = file.cbegin();
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static std::string varNameRegex =
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R"re((?:[a-zA-Z_][a-zA-Z0-9_]*))re";
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static std::string simpleStringRegex =
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R"re((?:[a-zA-Z0-9_/:\.\-\+=@%]*))re";
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static std::string dquotedStringRegex =
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R"re((?:\$?"(?:[^"\\]|\\[$`"\\\n])*"))re";
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static std::string squotedStringRegex =
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R"re((?:\$?(?:'(?:[^'\\]|\\[abeEfnrtv\\'"?])*'|\\')+))re";
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static std::string indexedArrayRegex =
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R"re((?:\(( *\[[0-9]+\]="(?:[^"\\]|\\.)*")*\)))re";
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static std::regex declareRegex(
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"^declare -a?x (" + varNameRegex + ")(=(" +
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dquotedStringRegex + "|" + indexedArrayRegex + "))?\n");
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static std::regex varRegex(
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"^(" + varNameRegex + ")=(" + simpleStringRegex + "|" + squotedStringRegex + "|" + indexedArrayRegex + ")\n");
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/* Note: we distinguish between an indexed and associative array
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using the space before the closing parenthesis. Will
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undoubtedly regret this some day. */
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static std::regex assocArrayRegex(
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"^(" + varNameRegex + ")=" + R"re((?:\(( *\[[^\]]+\]="(?:[^"\\]|\\.)*")* *\)))re" + "\n");
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static std::regex functionRegex(
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"^" + varNameRegex + " \\(\\) *\n");
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while (pos != file.end()) {
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std::smatch match;
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if (std::regex_search(pos, file.cend(), match, declareRegex, std::regex_constants::match_continuous)) {
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pos = match[0].second;
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exported.insert(match[1]);
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for (auto & [name, info] : json["variables"].items()) {
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std::string type = info["type"];
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if (type == "var" || type == "exported")
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res.vars.insert({name, BuildEnvironment::String { .exported = type == "exported", .value = info["value"] }});
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else if (type == "array")
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res.vars.insert({name, (Array) info["value"]});
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else if (type == "associative")
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res.vars.insert({name, (Associative) info["value"]});
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}
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else if (std::regex_search(pos, file.cend(), match, varRegex, std::regex_constants::match_continuous)) {
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pos = match[0].second;
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res.env.insert({match[1], Var { .exported = exported.count(match[1]) > 0, .quoted = match[2] }});
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for (auto & [name, def] : json["bashFunctions"].items()) {
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res.bashFunctions.insert({name, def});
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}
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else if (std::regex_search(pos, file.cend(), match, assocArrayRegex, std::regex_constants::match_continuous)) {
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pos = match[0].second;
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res.env.insert({match[1], Var { .associative = true, .quoted = match[2] }});
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}
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else if (std::regex_search(pos, file.cend(), match, functionRegex, std::regex_constants::match_continuous)) {
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res.bashFunctions = std::string(pos, file.cend());
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break;
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}
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else throw Error("shell environment '%s' has unexpected line '%s'",
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path, file.substr(pos - file.cbegin(), 60));
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}
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res.env.erase("__output");
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return res;
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}
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void toBash(std::ostream & out, const std::set<std::string> & ignoreVars) const
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{
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for (auto & [name, value] : vars) {
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if (!ignoreVars.count(name) && !hasPrefix(name, "BASH_")) {
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if (auto str = std::get_if<String>(&value)) {
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out << fmt("%s=%s\n", name, shellEscape(str->value));
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if (str->exported)
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out << fmt("export %s\n", name);
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}
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else if (auto arr = std::get_if<Array>(&value)) {
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out << "declare -a " << name << "=(";
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for (auto & s : *arr)
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out << shellEscape(s) << " ";
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out << ")\n";
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}
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else if (auto arr = std::get_if<Associative>(&value)) {
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out << "declare -A " << name << "=(";
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for (auto & [n, v] : *arr)
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out << "[" << shellEscape(n) << "]=" << shellEscape(v) << " ";
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out << ")\n";
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}
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}
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}
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for (auto & [name, def] : bashFunctions) {
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out << name << " ()\n{\n" << def << "}\n";
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}
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}
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static std::string getString(const Value & value)
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{
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if (auto str = std::get_if<String>(&value))
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return str->value;
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else
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throw Error("bash variable is not a string");
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}
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static Array getStrings(const Value & value)
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{
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if (auto str = std::get_if<String>(&value))
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return tokenizeString<Array>(str->value);
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else if (auto arr = std::get_if<Array>(&value)) {
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return *arr;
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}
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else
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throw Error("bash variable is not a string or array");
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}
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};
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const static std::string getEnvSh =
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#include "get-env.sh.gen.hh"
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;
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@ -185,7 +189,7 @@ StorePath getDerivationEnvironment(ref<Store> store, const StorePath & drvPath)
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struct Common : InstallableCommand, MixProfile
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{
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std::set<string> ignoreVars{
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std::set<std::string> ignoreVars{
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"BASHOPTS",
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"EUID",
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"HOME", // FIXME: don't ignore in pure mode?
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@ -233,22 +237,10 @@ struct Common : InstallableCommand, MixProfile
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out << "nix_saved_PATH=\"$PATH\"\n";
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for (auto & i : buildEnvironment.env) {
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if (!ignoreVars.count(i.first) && !hasPrefix(i.first, "BASH_")) {
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if (i.second.associative)
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out << fmt("declare -A %s=(%s)\n", i.first, i.second.quoted);
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else {
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out << fmt("%s=%s\n", i.first, i.second.quoted);
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if (i.second.exported)
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out << fmt("export %s\n", i.first);
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}
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}
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}
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buildEnvironment.toBash(out, ignoreVars);
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out << "PATH=\"$PATH:$nix_saved_PATH\"\n";
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out << buildEnvironment.bashFunctions << "\n";
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out << "export NIX_BUILD_TOP=\"$(mktemp -d -t nix-shell.XXXXXX)\"\n";
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for (auto & i : {"TMP", "TMPDIR", "TEMP", "TEMPDIR"})
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out << fmt("export %s=\"$NIX_BUILD_TOP\"\n", i);
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@ -258,16 +250,16 @@ struct Common : InstallableCommand, MixProfile
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auto script = out.str();
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/* Substitute occurrences of output paths. */
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auto outputs = buildEnvironment.env.find("outputs");
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assert(outputs != buildEnvironment.env.end());
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auto outputs = buildEnvironment.vars.find("outputs");
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assert(outputs != buildEnvironment.vars.end());
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// FIXME: properly unquote 'outputs'.
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StringMap rewrites;
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for (auto & outputName : tokenizeString<std::vector<std::string>>(replaceStrings(outputs->second.quoted, "'", ""))) {
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auto from = buildEnvironment.env.find(outputName);
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assert(from != buildEnvironment.env.end());
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for (auto & outputName : BuildEnvironment::getStrings(outputs->second)) {
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auto from = buildEnvironment.vars.find(outputName);
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assert(from != buildEnvironment.vars.end());
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// FIXME: unquote
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rewrites.insert({from->second.quoted, outputsDir + "/" + outputName});
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rewrites.insert({BuildEnvironment::getString(from->second), outputsDir + "/" + outputName});
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}
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/* Substitute redirects. */
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@ -321,7 +313,7 @@ struct Common : InstallableCommand, MixProfile
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updateProfile(shellOutPath);
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return {readEnvironment(strPath), strPath};
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return {BuildEnvironment::fromJSON(strPath), strPath};
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}
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};
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@ -8,10 +8,98 @@ if [[ -n $stdenv ]]; then
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source $stdenv/setup
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fi
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# Better to use compgen, but stdenv bash doesn't have it.
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__vars="$(declare -p)"
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__functions="$(declare -F)"
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__dumpEnv() {
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printf '{\n'
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printf ' "bashFunctions": {\n'
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local __first=1
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while read __line; do
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if ! [[ $__line =~ ^declare\ -f\ (.*) ]]; then continue; fi
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__fun_name="${BASH_REMATCH[1]}"
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__fun_body="$(type $__fun_name)"
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if [[ $__fun_body =~ \{(.*)\} ]]; then
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if [[ -z $__first ]]; then printf ',\n'; else __first=; fi
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__fun_body="${BASH_REMATCH[1]}"
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printf " "
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__escapeString "$__fun_name"
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printf ':'
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__escapeString "$__fun_body"
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else
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printf "Cannot parse definition of function '%s'.\n" "$__fun_name" >&2
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return 1
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fi
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done < <(printf "%s\n" "$__functions")
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printf '\n },\n'
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printf ' "variables": {\n'
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local __first=1
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while read __line; do
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if ! [[ $__line =~ ^declare\ (-[^ ])\ ([^=]*) ]]; then continue; fi
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local type="${BASH_REMATCH[1]}"
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local __var_name="${BASH_REMATCH[2]}"
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if [[ -z $__first ]]; then printf ',\n'; else __first=; fi
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printf " "
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__escapeString "$__var_name"
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printf ': {'
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# FIXME: handle -i, -r, -n.
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if [[ $type == -x ]]; then
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printf '"type": "exported", "value": '
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__escapeString "${!__var_name}"
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elif [[ $type == -- ]]; then
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printf '"type": "var", "value": '
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__escapeString "${!__var_name}"
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elif [[ $type == -a ]]; then
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printf '"type": "array", "value": ['
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local __first2=1
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__var_name="$__var_name[@]"
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for __i in "${!__var_name}"; do
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if [[ -z $__first2 ]]; then printf ', '; else __first2=; fi
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__escapeString "$__i"
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printf ' '
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done
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printf ']'
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elif [[ $type == -A ]]; then
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printf '"type": "associative", "value": {\n'
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local __first2=1
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declare -n __var_name2="$__var_name"
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for __i in "${!__var_name2[@]}"; do
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if [[ -z $__first2 ]]; then printf ',\n'; else __first2=; fi
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printf " "
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__escapeString "$__i"
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printf ": "
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__escapeString "${__var_name2[$__i]}"
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done
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printf '\n }'
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else
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printf '"type": "unknown"'
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fi
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printf "}"
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done < <(printf "%s\n" "$__vars")
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printf '\n }\n}'
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}
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__escapeString() {
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local __s="$1"
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__s="${__s//\\/\\\\}"
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__s="${__s//\"/\\\"}"
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__s="${__s//$'\n'/\\n}"
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__s="${__s//$'\r'/\\r}"
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__s="${__s//$'\t'/\\t}"
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printf '"%s"' "$__s"
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}
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# Dump the bash environment as JSON.
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for __output in $outputs; do
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if [[ -z $__done ]]; then
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export > ${!__output}
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set >> ${!__output}
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__dumpEnv > ${!__output}
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__done=1
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else
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echo -n >> ${!__output}
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