501 lines
16 KiB
C++
501 lines
16 KiB
C++
#include "eval.hh"
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#include "command.hh"
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#include "common-args.hh"
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#include "shared.hh"
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#include "store-api.hh"
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#include "derivations.hh"
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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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using namespace nix;
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struct DevelopSettings : Config
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{
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Setting<std::string> bashPrompt{this, "", "bash-prompt",
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"The bash prompt (`PS1`) in `nix develop` shells."};
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Setting<std::string> bashPromptSuffix{this, "", "bash-prompt-suffix",
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"Suffix appended to the `PS1` environment variable in `nix develop` shells."};
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};
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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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};
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BuildEnvironment readEnvironment(const Path & path)
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{
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BuildEnvironment res;
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std::set<std::string> exported;
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debug("reading environment file '%s'", path);
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auto file = 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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}
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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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}
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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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const static std::string getEnvSh =
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#include "get-env.sh.gen.hh"
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;
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/* Given an existing derivation, return the shell environment as
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initialised by stdenv's setup script. We do this by building a
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modified derivation with the same dependencies and nearly the same
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initial environment variables, that just writes the resulting
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environment to a file and exits. */
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StorePath getDerivationEnvironment(ref<Store> store, const StorePath & drvPath)
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{
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auto drv = store->derivationFromPath(drvPath);
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auto builder = baseNameOf(drv.builder);
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if (builder != "bash")
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throw Error("'nix develop' only works on derivations that use 'bash' as their builder");
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auto getEnvShPath = store->addTextToStore("get-env.sh", getEnvSh, {});
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drv.args = {store->printStorePath(getEnvShPath)};
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/* Remove derivation checks. */
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drv.env.erase("allowedReferences");
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drv.env.erase("allowedRequisites");
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drv.env.erase("disallowedReferences");
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drv.env.erase("disallowedRequisites");
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/* Rehash and write the derivation. FIXME: would be nice to use
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'buildDerivation', but that's privileged. */
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drv.name += "-env";
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for (auto & output : drv.outputs) {
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output.second = { .output = DerivationOutputInputAddressed { .path = StorePath::dummy } };
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drv.env[output.first] = "";
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}
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drv.inputSrcs.insert(std::move(getEnvShPath));
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Hash h = std::get<0>(hashDerivationModulo(*store, drv, true));
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for (auto & output : drv.outputs) {
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auto outPath = store->makeOutputPath(output.first, h, drv.name);
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output.second = { .output = DerivationOutputInputAddressed { .path = outPath } };
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drv.env[output.first] = store->printStorePath(outPath);
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}
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auto shellDrvPath = writeDerivation(*store, drv);
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/* Build the derivation. */
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store->buildPaths({{shellDrvPath}});
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for (auto & [_0, outputAndOptPath] : drv.outputsAndOptPaths(*store)) {
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auto & [_1, optPath] = outputAndOptPath;
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assert(optPath);
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auto & outPath = *optPath;
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assert(store->isValidPath(outPath));
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auto outPathS = store->toRealPath(outPath);
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if (lstat(outPathS).st_size)
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return outPath;
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}
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throw Error("get-env.sh failed to produce an environment");
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}
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struct Common : InstallableCommand, MixProfile
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{
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std::set<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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"HOSTNAME",
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"NIX_BUILD_TOP",
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"NIX_ENFORCE_PURITY",
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"NIX_LOG_FD",
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"PPID",
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"PWD",
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"SHELLOPTS",
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"SHLVL",
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"SSL_CERT_FILE", // FIXME: only want to ignore /no-cert-file.crt
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"TEMP",
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"TEMPDIR",
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"TERM",
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"TMP",
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"TMPDIR",
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"TZ",
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"UID",
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};
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std::vector<std::pair<std::string, std::string>> redirects;
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Common()
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{
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addFlag({
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.longName = "redirect",
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.description = "Redirect a store path to a mutable location.",
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.labels = {"installable", "outputs-dir"},
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.handler = {[&](std::string installable, std::string outputsDir) {
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redirects.push_back({installable, outputsDir});
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}}
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});
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}
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std::string makeRcScript(
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ref<Store> store,
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const BuildEnvironment & buildEnvironment,
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const Path & outputsDir = absPath(".") + "/outputs")
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{
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std::ostringstream out;
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out << "unset shellHook\n";
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out << "nix_saved_PATH=\"$PATH\"\n";
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for (auto & i : buildEnvironment.env) {
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if (!ignoreVars.count(i.first) && !hasPrefix(i.first, "BASH_")) {
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if (i.second.associative)
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out << fmt("declare -A %s=(%s)\n", i.first, i.second.quoted);
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else {
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out << fmt("%s=%s\n", i.first, i.second.quoted);
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if (i.second.exported)
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out << fmt("export %s\n", i.first);
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}
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}
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}
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out << "PATH=\"$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=\"$NIX_BUILD_TOP\"\n", i);
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out << "eval \"$shellHook\"\n";
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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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// 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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// FIXME: unquote
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rewrites.insert({from->second.quoted, outputsDir + "/" + outputName});
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}
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/* Substitute redirects. */
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for (auto & [installable_, dir_] : redirects) {
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auto dir = absPath(dir_);
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auto installable = parseInstallable(store, installable_);
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auto buildable = installable->toBuildable();
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auto doRedirect = [&](const StorePath & path)
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{
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auto from = store->printStorePath(path);
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if (script.find(from) == std::string::npos)
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warn("'%s' (path '%s') is not used by this build environment", installable->what(), from);
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else {
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printInfo("redirecting '%s' to '%s'", from, dir);
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rewrites.insert({from, dir});
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}
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};
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std::visit(overloaded {
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[&](const BuildableOpaque & bo) {
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doRedirect(bo.path);
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},
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[&](const BuildableFromDrv & bfd) {
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for (auto & [outputName, path] : bfd.outputs)
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if (path) doRedirect(*path);
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},
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}, buildable);
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}
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return rewriteStrings(script, rewrites);
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}
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Strings getDefaultFlakeAttrPaths() override
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{
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return {"devShell." + settings.thisSystem.get(), "defaultPackage." + settings.thisSystem.get()};
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}
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StorePath getShellOutPath(ref<Store> store)
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{
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auto path = installable->getStorePath();
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if (path && hasSuffix(path->to_string(), "-env"))
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return *path;
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else {
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auto drvs = toDerivations(store, {installable});
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if (drvs.size() != 1)
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throw Error("'%s' needs to evaluate to a single derivation, but it evaluated to %d derivations",
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installable->what(), drvs.size());
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auto & drvPath = *drvs.begin();
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return getDerivationEnvironment(store, drvPath);
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}
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}
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std::pair<BuildEnvironment, std::string> getBuildEnvironment(ref<Store> store)
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{
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auto shellOutPath = getShellOutPath(store);
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auto strPath = store->printStorePath(shellOutPath);
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updateProfile(shellOutPath);
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return {readEnvironment(strPath), strPath};
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}
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};
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struct CmdDevelop : Common, MixEnvironment
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{
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std::vector<std::string> command;
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std::optional<std::string> phase;
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CmdDevelop()
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{
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addFlag({
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.longName = "command",
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.shortName = 'c',
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.description = "Instead of starting an interactive shell, start the specified command and arguments.",
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.labels = {"command", "args"},
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.handler = {[&](std::vector<std::string> ss) {
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if (ss.empty()) throw UsageError("--command requires at least one argument");
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command = ss;
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}}
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});
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addFlag({
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.longName = "phase",
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.description = "The stdenv phase to run (e.g. `build` or `configure`).",
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.labels = {"phase-name"},
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.handler = {&phase},
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});
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addFlag({
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.longName = "configure",
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.description = "Run the `configure` phase.",
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.handler = {&phase, {"configure"}},
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});
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addFlag({
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.longName = "build",
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.description = "Run the `build` phase.",
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.handler = {&phase, {"build"}},
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});
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addFlag({
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.longName = "check",
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.description = "Run the `check` phase.",
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.handler = {&phase, {"check"}},
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});
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addFlag({
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.longName = "install",
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.description = "Run the `install` phase.",
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.handler = {&phase, {"install"}},
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});
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addFlag({
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.longName = "installcheck",
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.description = "Run the `installcheck` phase.",
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.handler = {&phase, {"installCheck"}},
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});
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}
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std::string description() override
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{
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return "run a bash shell that provides the build environment of a derivation";
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}
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std::string doc() override
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{
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return
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#include "develop.md"
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;
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}
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void run(ref<Store> store) override
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{
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auto [buildEnvironment, gcroot] = getBuildEnvironment(store);
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auto [rcFileFd, rcFilePath] = createTempFile("nix-shell");
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auto script = makeRcScript(store, buildEnvironment);
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if (verbosity >= lvlDebug)
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script += "set -x\n";
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script += fmt("rm -f '%s'\n", rcFilePath);
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if (phase) {
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if (!command.empty())
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throw UsageError("you cannot use both '--command' and '--phase'");
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// FIXME: foundMakefile is set by buildPhase, need to get
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// rid of that.
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script += fmt("foundMakefile=1\n");
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script += fmt("runHook %1%Phase\n", *phase);
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}
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else if (!command.empty()) {
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std::vector<std::string> args;
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for (auto s : command)
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args.push_back(shellEscape(s));
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script += fmt("exec %s\n", concatStringsSep(" ", args));
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}
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else {
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script += "[ -n \"$PS1\" ] && [ -e ~/.bashrc ] && source ~/.bashrc;\n";
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if (developSettings.bashPrompt != "")
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script += fmt("[ -n \"$PS1\" ] && PS1=%s;\n", shellEscape(developSettings.bashPrompt));
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if (developSettings.bashPromptSuffix != "")
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script += fmt("[ -n \"$PS1\" ] && PS1+=%s;\n", shellEscape(developSettings.bashPromptSuffix));
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}
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writeFull(rcFileFd.get(), script);
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stopProgressBar();
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setEnviron();
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// prevent garbage collection until shell exits
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setenv("NIX_GCROOT", gcroot.data(), 1);
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Path shell = "bash";
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try {
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auto state = getEvalState();
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auto bashInstallable = std::make_shared<InstallableFlake>(
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this,
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state,
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installable->nixpkgsFlakeRef(),
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Strings{"bashInteractive"},
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Strings{"legacyPackages." + settings.thisSystem.get() + "."},
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lockFlags);
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shell = state->store->printStorePath(
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toStorePath(state->store, Realise::Outputs, OperateOn::Output, bashInstallable)) + "/bin/bash";
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} catch (Error &) {
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ignoreException();
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}
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// If running a phase or single command, don't want an interactive shell running after
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// Ctrl-C, so don't pass --rcfile
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auto args = phase || !command.empty() ? Strings{std::string(baseNameOf(shell)), rcFilePath}
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: Strings{std::string(baseNameOf(shell)), "--rcfile", rcFilePath};
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restoreAffinity();
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restoreSignals();
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execvp(shell.c_str(), stringsToCharPtrs(args).data());
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throw SysError("executing shell '%s'", shell);
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}
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};
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struct CmdPrintDevEnv : Common
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{
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std::string description() override
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{
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return "print shell code that can be sourced by bash to reproduce the build environment of a derivation";
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}
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std::string doc() override
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{
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return
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#include "print-dev-env.md"
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;
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}
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Category category() override { return catUtility; }
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void run(ref<Store> store) override
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{
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auto buildEnvironment = getBuildEnvironment(store).first;
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stopProgressBar();
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std::cout << makeRcScript(store, buildEnvironment);
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}
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};
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static auto rCmdPrintDevEnv = registerCommand<CmdPrintDevEnv>("print-dev-env");
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static auto rCmdDevelop = registerCommand<CmdDevelop>("develop");
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