forked from lix-project/lix
547 lines
17 KiB
C++
547 lines
17 KiB
C++
#include "eval.hh"
|
|
#include "command.hh"
|
|
#include "common-args.hh"
|
|
#include "shared.hh"
|
|
#include "store-api.hh"
|
|
#include "path-with-outputs.hh"
|
|
#include "derivations.hh"
|
|
#include "affinity.hh"
|
|
#include "progress-bar.hh"
|
|
|
|
#include <nlohmann/json.hpp>
|
|
|
|
using namespace nix;
|
|
|
|
struct DevelopSettings : Config
|
|
{
|
|
Setting<std::string> bashPrompt{this, "", "bash-prompt",
|
|
"The bash prompt (`PS1`) in `nix develop` shells."};
|
|
|
|
Setting<std::string> bashPromptSuffix{this, "", "bash-prompt-suffix",
|
|
"Suffix appended to the `PS1` environment variable in `nix develop` shells."};
|
|
};
|
|
|
|
static DevelopSettings developSettings;
|
|
|
|
static GlobalConfig::Register rDevelopSettings(&developSettings);
|
|
|
|
struct BuildEnvironment
|
|
{
|
|
struct String
|
|
{
|
|
bool exported;
|
|
std::string value;
|
|
|
|
bool operator == (const String & other) const
|
|
{
|
|
return exported == other.exported && value == other.value;
|
|
}
|
|
};
|
|
|
|
using Array = std::vector<std::string>;
|
|
|
|
using Associative = std::map<std::string, std::string>;
|
|
|
|
using Value = std::variant<String, Array, Associative>;
|
|
|
|
std::map<std::string, Value> vars;
|
|
std::map<std::string, std::string> bashFunctions;
|
|
|
|
static BuildEnvironment fromJSON(std::string_view in)
|
|
{
|
|
BuildEnvironment res;
|
|
|
|
std::set<std::string> exported;
|
|
|
|
auto json = nlohmann::json::parse(in);
|
|
|
|
for (auto & [name, info] : json["variables"].items()) {
|
|
std::string type = info["type"];
|
|
if (type == "var" || type == "exported")
|
|
res.vars.insert({name, BuildEnvironment::String { .exported = type == "exported", .value = info["value"] }});
|
|
else if (type == "array")
|
|
res.vars.insert({name, (Array) info["value"]});
|
|
else if (type == "associative")
|
|
res.vars.insert({name, (Associative) info["value"]});
|
|
}
|
|
|
|
for (auto & [name, def] : json["bashFunctions"].items()) {
|
|
res.bashFunctions.insert({name, def});
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
std::string toJSON() const
|
|
{
|
|
auto res = nlohmann::json::object();
|
|
|
|
auto vars2 = nlohmann::json::object();
|
|
for (auto & [name, value] : vars) {
|
|
auto info = nlohmann::json::object();
|
|
if (auto str = std::get_if<String>(&value)) {
|
|
info["type"] = str->exported ? "exported" : "var";
|
|
info["value"] = str->value;
|
|
}
|
|
else if (auto arr = std::get_if<Array>(&value)) {
|
|
info["type"] = "array";
|
|
info["value"] = *arr;
|
|
}
|
|
else if (auto arr = std::get_if<Associative>(&value)) {
|
|
info["type"] = "associative";
|
|
info["value"] = *arr;
|
|
}
|
|
vars2[name] = std::move(info);
|
|
}
|
|
res["variables"] = std::move(vars2);
|
|
|
|
res["bashFunctions"] = bashFunctions;
|
|
|
|
auto json = res.dump();
|
|
|
|
assert(BuildEnvironment::fromJSON(json) == *this);
|
|
|
|
return json;
|
|
}
|
|
|
|
void toBash(std::ostream & out, const std::set<std::string> & ignoreVars) const
|
|
{
|
|
for (auto & [name, value] : vars) {
|
|
if (!ignoreVars.count(name)) {
|
|
if (auto str = std::get_if<String>(&value)) {
|
|
out << fmt("%s=%s\n", name, shellEscape(str->value));
|
|
if (str->exported)
|
|
out << fmt("export %s\n", name);
|
|
}
|
|
else if (auto arr = std::get_if<Array>(&value)) {
|
|
out << "declare -a " << name << "=(";
|
|
for (auto & s : *arr)
|
|
out << shellEscape(s) << " ";
|
|
out << ")\n";
|
|
}
|
|
else if (auto arr = std::get_if<Associative>(&value)) {
|
|
out << "declare -A " << name << "=(";
|
|
for (auto & [n, v] : *arr)
|
|
out << "[" << shellEscape(n) << "]=" << shellEscape(v) << " ";
|
|
out << ")\n";
|
|
}
|
|
}
|
|
}
|
|
|
|
for (auto & [name, def] : bashFunctions) {
|
|
out << name << " ()\n{\n" << def << "}\n";
|
|
}
|
|
}
|
|
|
|
static std::string getString(const Value & value)
|
|
{
|
|
if (auto str = std::get_if<String>(&value))
|
|
return str->value;
|
|
else
|
|
throw Error("bash variable is not a string");
|
|
}
|
|
|
|
static Array getStrings(const Value & value)
|
|
{
|
|
if (auto str = std::get_if<String>(&value))
|
|
return tokenizeString<Array>(str->value);
|
|
else if (auto arr = std::get_if<Array>(&value)) {
|
|
return *arr;
|
|
} else if (auto assoc = std::get_if<Associative>(&value)) {
|
|
Array assocKeys;
|
|
std::for_each(assoc->begin(), assoc->end(), [&](auto & n) { assocKeys.push_back(n.first); });
|
|
return assocKeys;
|
|
}
|
|
else
|
|
throw Error("bash variable is not a string or array");
|
|
}
|
|
|
|
bool operator == (const BuildEnvironment & other) const
|
|
{
|
|
return vars == other.vars && bashFunctions == other.bashFunctions;
|
|
}
|
|
};
|
|
|
|
const static std::string getEnvSh =
|
|
#include "get-env.sh.gen.hh"
|
|
;
|
|
|
|
/* Given an existing derivation, return the shell environment as
|
|
initialised by stdenv's setup script. We do this by building a
|
|
modified derivation with the same dependencies and nearly the same
|
|
initial environment variables, that just writes the resulting
|
|
environment to a file and exits. */
|
|
StorePath getDerivationEnvironment(ref<Store> store, const StorePath & drvPath)
|
|
{
|
|
auto drv = store->derivationFromPath(drvPath);
|
|
|
|
auto builder = baseNameOf(drv.builder);
|
|
if (builder != "bash")
|
|
throw Error("'nix develop' only works on derivations that use 'bash' as their builder");
|
|
|
|
auto getEnvShPath = store->addTextToStore("get-env.sh", getEnvSh, {});
|
|
|
|
drv.args = {store->printStorePath(getEnvShPath)};
|
|
|
|
/* Remove derivation checks. */
|
|
drv.env.erase("allowedReferences");
|
|
drv.env.erase("allowedRequisites");
|
|
drv.env.erase("disallowedReferences");
|
|
drv.env.erase("disallowedRequisites");
|
|
|
|
/* Rehash and write the derivation. FIXME: would be nice to use
|
|
'buildDerivation', but that's privileged. */
|
|
drv.name += "-env";
|
|
drv.inputSrcs.insert(std::move(getEnvShPath));
|
|
if (settings.isExperimentalFeatureEnabled("ca-derivations")) {
|
|
for (auto & output : drv.outputs) {
|
|
output.second = {
|
|
.output = DerivationOutputDeferred{},
|
|
};
|
|
drv.env[output.first] = hashPlaceholder(output.first);
|
|
}
|
|
} else {
|
|
for (auto & output : drv.outputs) {
|
|
output.second = { .output = DerivationOutputInputAddressed { .path = StorePath::dummy } };
|
|
drv.env[output.first] = "";
|
|
}
|
|
Hash h = std::get<0>(hashDerivationModulo(*store, drv, true));
|
|
|
|
for (auto & output : drv.outputs) {
|
|
auto outPath = store->makeOutputPath(output.first, h, drv.name);
|
|
output.second = { .output = DerivationOutputInputAddressed { .path = outPath } };
|
|
drv.env[output.first] = store->printStorePath(outPath);
|
|
}
|
|
}
|
|
|
|
auto shellDrvPath = writeDerivation(*store, drv);
|
|
|
|
/* Build the derivation. */
|
|
store->buildPaths({DerivedPath::Built{shellDrvPath}});
|
|
|
|
for (auto & [_0, optPath] : store->queryPartialDerivationOutputMap(shellDrvPath)) {
|
|
assert(optPath);
|
|
auto & outPath = *optPath;
|
|
assert(store->isValidPath(outPath));
|
|
auto outPathS = store->toRealPath(outPath);
|
|
if (lstat(outPathS).st_size)
|
|
return outPath;
|
|
}
|
|
|
|
throw Error("get-env.sh failed to produce an environment");
|
|
}
|
|
|
|
struct Common : InstallableCommand, MixProfile
|
|
{
|
|
std::set<std::string> ignoreVars{
|
|
"BASHOPTS",
|
|
"HOME", // FIXME: don't ignore in pure mode?
|
|
"NIX_BUILD_TOP",
|
|
"NIX_ENFORCE_PURITY",
|
|
"NIX_LOG_FD",
|
|
"NIX_REMOTE",
|
|
"PPID",
|
|
"SHELLOPTS",
|
|
"SSL_CERT_FILE", // FIXME: only want to ignore /no-cert-file.crt
|
|
"TEMP",
|
|
"TEMPDIR",
|
|
"TERM",
|
|
"TMP",
|
|
"TMPDIR",
|
|
"TZ",
|
|
"UID",
|
|
};
|
|
|
|
std::vector<std::pair<std::string, std::string>> redirects;
|
|
|
|
Common()
|
|
{
|
|
addFlag({
|
|
.longName = "redirect",
|
|
.description = "Redirect a store path to a mutable location.",
|
|
.labels = {"installable", "outputs-dir"},
|
|
.handler = {[&](std::string installable, std::string outputsDir) {
|
|
redirects.push_back({installable, outputsDir});
|
|
}}
|
|
});
|
|
}
|
|
|
|
std::string makeRcScript(
|
|
ref<Store> store,
|
|
const BuildEnvironment & buildEnvironment,
|
|
const Path & outputsDir = absPath(".") + "/outputs")
|
|
{
|
|
std::ostringstream out;
|
|
|
|
out << "unset shellHook\n";
|
|
|
|
out << "nix_saved_PATH=\"$PATH\"\n";
|
|
|
|
buildEnvironment.toBash(out, ignoreVars);
|
|
|
|
out << "PATH=\"$PATH:$nix_saved_PATH\"\n";
|
|
|
|
out << "export NIX_BUILD_TOP=\"$(mktemp -d -t nix-shell.XXXXXX)\"\n";
|
|
for (auto & i : {"TMP", "TMPDIR", "TEMP", "TEMPDIR"})
|
|
out << fmt("export %s=\"$NIX_BUILD_TOP\"\n", i);
|
|
|
|
out << "eval \"$shellHook\"\n";
|
|
|
|
auto script = out.str();
|
|
|
|
/* Substitute occurrences of output paths. */
|
|
auto outputs = buildEnvironment.vars.find("outputs");
|
|
assert(outputs != buildEnvironment.vars.end());
|
|
|
|
// FIXME: properly unquote 'outputs'.
|
|
StringMap rewrites;
|
|
for (auto & outputName : BuildEnvironment::getStrings(outputs->second)) {
|
|
auto from = buildEnvironment.vars.find(outputName);
|
|
assert(from != buildEnvironment.vars.end());
|
|
// FIXME: unquote
|
|
rewrites.insert({BuildEnvironment::getString(from->second), outputsDir + "/" + outputName});
|
|
}
|
|
|
|
/* Substitute redirects. */
|
|
for (auto & [installable_, dir_] : redirects) {
|
|
auto dir = absPath(dir_);
|
|
auto installable = parseInstallable(store, installable_);
|
|
auto builtPaths = toStorePaths(
|
|
store, Realise::Nothing, OperateOn::Output, {installable});
|
|
for (auto & path: builtPaths) {
|
|
auto from = store->printStorePath(path);
|
|
if (script.find(from) == std::string::npos)
|
|
warn("'%s' (path '%s') is not used by this build environment", installable->what(), from);
|
|
else {
|
|
printInfo("redirecting '%s' to '%s'", from, dir);
|
|
rewrites.insert({from, dir});
|
|
}
|
|
}
|
|
}
|
|
|
|
return rewriteStrings(script, rewrites);
|
|
}
|
|
|
|
Strings getDefaultFlakeAttrPaths() override
|
|
{
|
|
return {"devShell." + settings.thisSystem.get(), "defaultPackage." + settings.thisSystem.get()};
|
|
}
|
|
Strings getDefaultFlakeAttrPathPrefixes() override
|
|
{
|
|
auto res = SourceExprCommand::getDefaultFlakeAttrPathPrefixes();
|
|
res.emplace_front("devShells." + settings.thisSystem.get());
|
|
return res;
|
|
}
|
|
|
|
StorePath getShellOutPath(ref<Store> store)
|
|
{
|
|
auto path = installable->getStorePath();
|
|
if (path && hasSuffix(path->to_string(), "-env"))
|
|
return *path;
|
|
else {
|
|
auto drvs = toDerivations(store, {installable});
|
|
|
|
if (drvs.size() != 1)
|
|
throw Error("'%s' needs to evaluate to a single derivation, but it evaluated to %d derivations",
|
|
installable->what(), drvs.size());
|
|
|
|
auto & drvPath = *drvs.begin();
|
|
|
|
return getDerivationEnvironment(store, drvPath);
|
|
}
|
|
}
|
|
|
|
std::pair<BuildEnvironment, std::string> getBuildEnvironment(ref<Store> store)
|
|
{
|
|
auto shellOutPath = getShellOutPath(store);
|
|
|
|
auto strPath = store->printStorePath(shellOutPath);
|
|
|
|
updateProfile(shellOutPath);
|
|
|
|
debug("reading environment file '%s'", strPath);
|
|
|
|
return {BuildEnvironment::fromJSON(readFile(strPath)), strPath};
|
|
}
|
|
};
|
|
|
|
struct CmdDevelop : Common, MixEnvironment
|
|
{
|
|
std::vector<std::string> command;
|
|
std::optional<std::string> phase;
|
|
|
|
CmdDevelop()
|
|
{
|
|
addFlag({
|
|
.longName = "command",
|
|
.shortName = 'c',
|
|
.description = "Instead of starting an interactive shell, start the specified command and arguments.",
|
|
.labels = {"command", "args"},
|
|
.handler = {[&](std::vector<std::string> ss) {
|
|
if (ss.empty()) throw UsageError("--command requires at least one argument");
|
|
command = ss;
|
|
}}
|
|
});
|
|
|
|
addFlag({
|
|
.longName = "phase",
|
|
.description = "The stdenv phase to run (e.g. `build` or `configure`).",
|
|
.labels = {"phase-name"},
|
|
.handler = {&phase},
|
|
});
|
|
|
|
addFlag({
|
|
.longName = "configure",
|
|
.description = "Run the `configure` phase.",
|
|
.handler = {&phase, {"configure"}},
|
|
});
|
|
|
|
addFlag({
|
|
.longName = "build",
|
|
.description = "Run the `build` phase.",
|
|
.handler = {&phase, {"build"}},
|
|
});
|
|
|
|
addFlag({
|
|
.longName = "check",
|
|
.description = "Run the `check` phase.",
|
|
.handler = {&phase, {"check"}},
|
|
});
|
|
|
|
addFlag({
|
|
.longName = "install",
|
|
.description = "Run the `install` phase.",
|
|
.handler = {&phase, {"install"}},
|
|
});
|
|
|
|
addFlag({
|
|
.longName = "installcheck",
|
|
.description = "Run the `installcheck` phase.",
|
|
.handler = {&phase, {"installCheck"}},
|
|
});
|
|
}
|
|
|
|
std::string description() override
|
|
{
|
|
return "run a bash shell that provides the build environment of a derivation";
|
|
}
|
|
|
|
std::string doc() override
|
|
{
|
|
return
|
|
#include "develop.md"
|
|
;
|
|
}
|
|
|
|
void run(ref<Store> store) override
|
|
{
|
|
auto [buildEnvironment, gcroot] = getBuildEnvironment(store);
|
|
|
|
auto [rcFileFd, rcFilePath] = createTempFile("nix-shell");
|
|
|
|
auto script = makeRcScript(store, buildEnvironment);
|
|
|
|
if (verbosity >= lvlDebug)
|
|
script += "set -x\n";
|
|
|
|
script += fmt("command rm -f '%s'\n", rcFilePath);
|
|
|
|
if (phase) {
|
|
if (!command.empty())
|
|
throw UsageError("you cannot use both '--command' and '--phase'");
|
|
// FIXME: foundMakefile is set by buildPhase, need to get
|
|
// rid of that.
|
|
script += fmt("foundMakefile=1\n");
|
|
script += fmt("runHook %1%Phase\n", *phase);
|
|
}
|
|
|
|
else if (!command.empty()) {
|
|
std::vector<std::string> args;
|
|
for (auto s : command)
|
|
args.push_back(shellEscape(s));
|
|
script += fmt("exec %s\n", concatStringsSep(" ", args));
|
|
}
|
|
|
|
else {
|
|
script = "[ -n \"$PS1\" ] && [ -e ~/.bashrc ] && source ~/.bashrc;\n" + script;
|
|
if (developSettings.bashPrompt != "")
|
|
script += fmt("[ -n \"$PS1\" ] && PS1=%s;\n", shellEscape(developSettings.bashPrompt));
|
|
if (developSettings.bashPromptSuffix != "")
|
|
script += fmt("[ -n \"$PS1\" ] && PS1+=%s;\n", shellEscape(developSettings.bashPromptSuffix));
|
|
}
|
|
|
|
writeFull(rcFileFd.get(), script);
|
|
|
|
stopProgressBar();
|
|
|
|
setEnviron();
|
|
// prevent garbage collection until shell exits
|
|
setenv("NIX_GCROOT", gcroot.data(), 1);
|
|
|
|
Path shell = "bash";
|
|
|
|
try {
|
|
auto state = getEvalState();
|
|
|
|
auto nixpkgsLockFlags = lockFlags;
|
|
nixpkgsLockFlags.inputOverrides = {};
|
|
nixpkgsLockFlags.inputUpdates = {};
|
|
|
|
auto bashInstallable = std::make_shared<InstallableFlake>(
|
|
this,
|
|
state,
|
|
installable->nixpkgsFlakeRef(),
|
|
Strings{"bashInteractive"},
|
|
Strings{"legacyPackages." + settings.thisSystem.get() + "."},
|
|
nixpkgsLockFlags);
|
|
|
|
shell = state->store->printStorePath(
|
|
toStorePath(state->store, Realise::Outputs, OperateOn::Output, bashInstallable)) + "/bin/bash";
|
|
} catch (Error &) {
|
|
ignoreException();
|
|
}
|
|
|
|
// If running a phase or single command, don't want an interactive shell running after
|
|
// Ctrl-C, so don't pass --rcfile
|
|
auto args = phase || !command.empty() ? Strings{std::string(baseNameOf(shell)), rcFilePath}
|
|
: Strings{std::string(baseNameOf(shell)), "--rcfile", rcFilePath};
|
|
|
|
restoreProcessContext();
|
|
|
|
execvp(shell.c_str(), stringsToCharPtrs(args).data());
|
|
|
|
throw SysError("executing shell '%s'", shell);
|
|
}
|
|
};
|
|
|
|
struct CmdPrintDevEnv : Common, MixJSON
|
|
{
|
|
std::string description() override
|
|
{
|
|
return "print shell code that can be sourced by bash to reproduce the build environment of a derivation";
|
|
}
|
|
|
|
std::string doc() override
|
|
{
|
|
return
|
|
#include "print-dev-env.md"
|
|
;
|
|
}
|
|
|
|
Category category() override { return catUtility; }
|
|
|
|
void run(ref<Store> store) override
|
|
{
|
|
auto buildEnvironment = getBuildEnvironment(store).first;
|
|
|
|
stopProgressBar();
|
|
|
|
logger->writeToStdout(
|
|
json
|
|
? buildEnvironment.toJSON()
|
|
: makeRcScript(store, buildEnvironment));
|
|
}
|
|
};
|
|
|
|
static auto rCmdPrintDevEnv = registerCommand<CmdPrintDevEnv>("print-dev-env");
|
|
static auto rCmdDevelop = registerCommand<CmdDevelop>("develop");
|