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#include "globals.hh"
#include <algorithm>
#include <map>
#include <thread>
#include <dlfcn.h>
#include "archive.hh"
#include "args.hh"
#include "util.hh"
namespace nix {
/* The default location of the daemon socket, relative to nixStateDir.
The socket is in a directory to allow you to control access to the
Nix daemon by setting the mode/ownership of the directory
appropriately. (This wouldn't work on the socket itself since it
must be deleted and recreated on startup.) */
#define DEFAULT_SOCKET_PATH "/daemon-socket/socket"
// TODO(tazjin): this was __APPLE__ specific, still needed?
#define DEFAULT_ALLOWED_IMPURE_PREFIXES ""
Settings settings;
static GlobalConfig::Register r1(&settings);
Settings::Settings()
: nixPrefix(NIX_PREFIX),
nixStore(canonPath(
getEnv("NIX_STORE_DIR", getEnv("NIX_STORE", NIX_STORE_DIR)))),
nixDataDir(canonPath(getEnv("NIX_DATA_DIR", NIX_DATA_DIR))),
nixLogDir(canonPath(getEnv("NIX_LOG_DIR", NIX_LOG_DIR))),
nixStateDir(canonPath(getEnv("NIX_STATE_DIR", NIX_STATE_DIR))),
nixConfDir(canonPath(getEnv("NIX_CONF_DIR", NIX_CONF_DIR))),
nixLibexecDir(canonPath(getEnv("NIX_LIBEXEC_DIR", NIX_LIBEXEC_DIR))),
nixBinDir(canonPath(getEnv("NIX_BIN_DIR", NIX_BIN_DIR))),
nixManDir(canonPath(NIX_MAN_DIR)),
nixDaemonSocketFile(canonPath(nixStateDir + DEFAULT_SOCKET_PATH)) {
buildUsersGroup = getuid() == 0 ? "nixbld" : "";
lockCPU = getEnv("NIX_AFFINITY_HACK", "1") == "1";
caFile = getEnv("NIX_SSL_CERT_FILE", getEnv("SSL_CERT_FILE", ""));
if (caFile.empty()) {
for (auto& fn :
{"/etc/ssl/certs/ca-certificates.crt",
"/nix/var/nix/profiles/default/etc/ssl/certs/ca-bundle.crt"}) {
if (pathExists(fn)) {
caFile = fn;
break;
}
}
}
/* Backwards compatibility. */
auto s = getEnv("NIX_REMOTE_SYSTEMS");
if (!s.empty()) {
Strings ss;
for (auto& p : tokenizeString<Strings>(s, ":")) {
ss.push_back("@" + p);
}
builders = concatStringsSep(" ", ss);
}
#if defined(__linux__) && defined(SANDBOX_SHELL)
sandboxPaths = tokenizeString<StringSet>("/bin/sh=" SANDBOX_SHELL);
#endif
allowedImpureHostPrefixes =
tokenizeString<StringSet>(DEFAULT_ALLOWED_IMPURE_PREFIXES);
}
void loadConfFile() {
globalConfig.applyConfigFile(settings.nixConfDir + "/nix.conf");
/* We only want to send overrides to the daemon, i.e. stuff from
~/.nix/nix.conf or the command line. */
globalConfig.resetOverriden();
auto dirs = getConfigDirs();
// Iterate over them in reverse so that the ones appearing first in the path
// take priority
for (auto dir = dirs.rbegin(); dir != dirs.rend(); dir++) {
globalConfig.applyConfigFile(*dir + "/nix/nix.conf");
}
}
unsigned int Settings::getDefaultCores() {
return std::max(1U, std::thread::hardware_concurrency());
}
StringSet Settings::getDefaultSystemFeatures() {
/* For backwards compatibility, accept some "features" that are
used in Nixpkgs to route builds to certain machines but don't
actually require anything special on the machines. */
StringSet features{"nixos-test", "benchmark", "big-parallel"};
#if __linux__
if (access("/dev/kvm", R_OK | W_OK) == 0) {
features.insert("kvm");
}
#endif
return features;
}
const string nixVersion = PACKAGE_VERSION;
template <>
void BaseSetting<SandboxMode>::set(const std::string& str) {
if (str == "true") {
value = smEnabled;
} else if (str == "relaxed") {
value = smRelaxed;
} else if (str == "false") {
value = smDisabled;
} else {
throw UsageError("option '%s' has invalid value '%s'", name, str);
}
}
template <>
std::string BaseSetting<SandboxMode>::to_string() {
if (value == smEnabled) {
return "true";
}
if (value == smRelaxed) {
return "relaxed";
} else if (value == smDisabled) {
return "false";
} else {
abort();
}
}
template <>
void BaseSetting<SandboxMode>::toJSON(JSONPlaceholder& out) {
AbstractSetting::toJSON(out);
}
template <>
void BaseSetting<SandboxMode>::convertToArg(Args& args,
const std::string& category) {
args.mkFlag()
.longName(name)
.description("Enable sandboxing.")
.handler([=](const std::vector<std::string>& ss) { override(smEnabled); })
.category(category);
args.mkFlag()
.longName("no-" + name)
.description("Disable sandboxing.")
.handler(
[=](const std::vector<std::string>& ss) { override(smDisabled); })
.category(category);
args.mkFlag()
.longName("relaxed-" + name)
.description("Enable sandboxing, but allow builds to disable it.")
.handler([=](const std::vector<std::string>& ss) { override(smRelaxed); })
.category(category);
}
void MaxBuildJobsSetting::set(const std::string& str) {
if (str == "auto") {
value = std::max(1U, std::thread::hardware_concurrency());
} else if (!string2Int(str, value)) {
throw UsageError(
"configuration setting '%s' should be 'auto' or an integer", name);
}
}
void initPlugins() {
for (const auto& pluginFile : settings.pluginFiles.get()) {
Paths pluginFiles;
try {
auto ents = readDirectory(pluginFile);
for (const auto& ent : ents) {
pluginFiles.emplace_back(pluginFile + "/" + ent.name);
}
} catch (SysError& e) {
if (e.errNo != ENOTDIR) {
throw;
}
pluginFiles.emplace_back(pluginFile);
}
for (const auto& file : pluginFiles) {
/* handle is purposefully leaked as there may be state in the
DSO needed by the action of the plugin. */
void* handle = dlopen(file.c_str(), RTLD_LAZY | RTLD_LOCAL);
if (handle == nullptr) {
throw Error("could not dynamically open plugin file '%s': %s", file,
dlerror());
}
}
}
/* Since plugins can add settings, try to re-apply previously
unknown settings. */
globalConfig.reapplyUnknownSettings();
globalConfig.warnUnknownSettings();
}
} // namespace nix
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