mirror of
https://github.com/NixOS/nix
synced 2025-06-30 03:23:16 +02:00
Refactor settings processing
Put all Nix configuration flags in a Settings object.
This commit is contained in:
Eelco Dolstra
parent
d50d7a2874
commit
97421eb5ec
19 changed files with 596 additions and 552 deletions
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@ -10,38 +10,63 @@
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namespace nix {
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string nixStore = "/UNINIT";
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string nixDataDir = "/UNINIT";
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string nixLogDir = "/UNINIT";
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string nixStateDir = "/UNINIT";
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string nixDBPath = "/UNINIT";
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string nixConfDir = "/UNINIT";
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string nixLibexecDir = "/UNINIT";
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string nixBinDir = "/UNINIT";
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bool keepFailed = false;
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bool keepGoing = false;
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bool tryFallback = false;
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Verbosity buildVerbosity = lvlError;
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unsigned int maxBuildJobs = 1;
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unsigned int buildCores = 1;
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bool readOnlyMode = false;
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string thisSystem = "unset";
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time_t maxSilentTime = 0;
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time_t buildTimeout = 0;
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Paths substituters;
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bool useBuildHook = true;
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bool printBuildTrace = false;
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Settings settings;
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static bool settingsRead = false;
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Settings::Settings()
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{
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keepFailed = false;
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keepGoing = false;
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tryFallback = false;
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buildVerbosity = lvlError;
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maxBuildJobs = 1;
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buildCores = 1;
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readOnlyMode = false;
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thisSystem = SYSTEM;
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maxSilentTime = 0;
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buildTimeout = 0;
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useBuildHook = true;
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printBuildTrace = false;
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reservedSize = 1024 * 1024;
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fsyncMetadata = true;
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useSQLiteWAL = true;
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syncBeforeRegistering = false;
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useSubstitutes = true;
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useChroot = false;
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dirsInChroot.insert("/dev");
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dirsInChroot.insert("/dev/pts");
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impersonateLinux26 = false;
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keepLog = true;
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compressLog = true;
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cacheFailure = false;
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pollInterval = 5;
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checkRootReachability = false;
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gcKeepOutputs = false;
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gcKeepDerivations = true;
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autoOptimiseStore = true;
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envKeepDerivations = false;
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}
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typedef std::map<string, Strings> Settings;
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static Settings settings;
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void Settings::processEnvironment()
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{
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nixStore = canonPath(getEnv("NIX_STORE_DIR", getEnv("NIX_STORE", NIX_STORE_DIR)));
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nixDataDir = canonPath(getEnv("NIX_DATA_DIR", NIX_DATA_DIR));
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nixLogDir = canonPath(getEnv("NIX_LOG_DIR", NIX_LOG_DIR));
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nixStateDir = canonPath(getEnv("NIX_STATE_DIR", NIX_STATE_DIR));
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nixDBPath = getEnv("NIX_DB_DIR", nixStateDir + "/db");
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nixConfDir = canonPath(getEnv("NIX_CONF_DIR", NIX_CONF_DIR));
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nixLibexecDir = canonPath(getEnv("NIX_LIBEXEC_DIR", NIX_LIBEXEC_DIR));
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nixBinDir = canonPath(getEnv("NIX_BIN_DIR", NIX_BIN_DIR));
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/* Overriden settings. */
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Settings settingsCmdline;
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string subs = getEnv("NIX_SUBSTITUTERS", "default");
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if (subs == "default") {
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substituters.push_back(nixLibexecDir + "/nix/substituters/copy-from-other-stores.pl");
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substituters.push_back(nixLibexecDir + "/nix/substituters/download-using-manifests.pl");
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substituters.push_back(nixLibexecDir + "/nix/substituters/download-from-binary-cache.pl");
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} else
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substituters = tokenizeString(subs, ":");
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}
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string & at(Strings & ss, unsigned int n)
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@ -52,7 +77,7 @@ string & at(Strings & ss, unsigned int n)
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}
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static void readSettings()
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void Settings::loadConfFile()
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{
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Path settingsFile = (format("%1%/%2%") % nixConfDir % "nix.conf").str();
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if (!pathExists(settingsFile)) return;
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@ -80,104 +105,88 @@ static void readSettings()
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Strings::iterator i = tokens.begin();
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advance(i, 2);
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settings[name] = Strings(i, tokens.end());
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settings[name] = concatStringsSep(" ", Strings(i, tokens.end())); // FIXME: slow
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};
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settings.insert(settingsCmdline.begin(), settingsCmdline.end());
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settingsRead = true;
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}
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Strings querySetting(const string & name, const Strings & def)
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void Settings::set(const string & name, const string & value)
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{
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if (!settingsRead) readSettings();
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Settings::iterator i = settings.find(name);
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return i == settings.end() ? def : i->second;
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settings[name] = value;
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}
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string querySetting(const string & name, const string & def)
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void Settings::update()
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{
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Strings defs;
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defs.push_back(def);
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Strings value = querySetting(name, defs);
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if (value.size() != 1)
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throw Error(format("configuration option `%1%' should not be a list") % name);
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return value.front();
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get(thisSystem, "system");
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get(maxBuildJobs, "build-max-jobs");
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get(buildCores, "build-cores");
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get(maxSilentTime, "build-max-silent-time");
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get(buildTimeout, "build-timeout");
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get(reservedSize, "gc-reserved-space");
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get(fsyncMetadata, "fsync-metadata");
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get(useSQLiteWAL, "use-sqlite-wal");
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get(syncBeforeRegistering, "sync-before-registering");
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get(useSubstitutes, "build-use-substitutes");
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get(buildUsersGroup, "build-users-group");
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get(useChroot, "build-use-chroot");
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get(dirsInChroot, "build-chroot-dirs");
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get(impersonateLinux26, "build-impersonate-linux-26");
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get(keepLog, "build-keep-log");
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get(compressLog, "build-compress-log");
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get(cacheFailure, "build-cache-failure");
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get(pollInterval, "build-poll-interval");
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get(checkRootReachability, "gc-check-reachability");
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get(gcKeepOutputs, "gc-keep-outputs");
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get(gcKeepDerivations, "gc-keep-derivations");
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get(autoOptimiseStore, "auto-optimise-store");
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get(envKeepDerivations, "env-keep-derivations");
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}
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bool queryBoolSetting(const string & name, bool def)
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void Settings::get(string & res, const string & name)
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{
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string v = querySetting(name, def ? "true" : "false");
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if (v == "true") return true;
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else if (v == "false") return false;
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SettingsMap::iterator i = settings.find(name);
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if (i == settings.end()) return;
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res = i->second;
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}
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void Settings::get(bool & res, const string & name)
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{
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SettingsMap::iterator i = settings.find(name);
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if (i == settings.end()) return;
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if (i->second == "true") res = true;
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else if (i->second == "false") res = false;
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else throw Error(format("configuration option `%1%' should be either `true' or `false', not `%2%'")
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% name % v);
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% name % i->second);
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}
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unsigned int queryIntSetting(const string & name, unsigned int def)
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void Settings::get(PathSet & res, const string & name)
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{
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int n;
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if (!string2Int(querySetting(name, int2String(def)), n) || n < 0)
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SettingsMap::iterator i = settings.find(name);
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if (i == settings.end()) return;
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res.clear();
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Strings ss = tokenizeString(i->second);
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res.insert(ss.begin(), ss.end());
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}
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template<class N> void Settings::get(N & res, const string & name)
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{
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SettingsMap::iterator i = settings.find(name);
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if (i == settings.end()) return;
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if (!string2Int(i->second, res))
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throw Error(format("configuration setting `%1%' should have an integer value") % name);
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return n;
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}
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void overrideSetting(const string & name, const Strings & value)
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{
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if (settingsRead) settings[name] = value;
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settingsCmdline[name] = value;
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}
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void reloadSettings()
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{
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settingsRead = false;
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settings.clear();
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}
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void setDefaultsFromEnvironment()
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{
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/* Setup Nix paths. */
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nixStore = canonPath(getEnv("NIX_STORE_DIR", getEnv("NIX_STORE", NIX_STORE_DIR)));
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nixDataDir = canonPath(getEnv("NIX_DATA_DIR", NIX_DATA_DIR));
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nixLogDir = canonPath(getEnv("NIX_LOG_DIR", NIX_LOG_DIR));
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nixStateDir = canonPath(getEnv("NIX_STATE_DIR", NIX_STATE_DIR));
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nixDBPath = getEnv("NIX_DB_DIR", nixStateDir + "/db");
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nixConfDir = canonPath(getEnv("NIX_CONF_DIR", NIX_CONF_DIR));
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nixLibexecDir = canonPath(getEnv("NIX_LIBEXEC_DIR", NIX_LIBEXEC_DIR));
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nixBinDir = canonPath(getEnv("NIX_BIN_DIR", NIX_BIN_DIR));
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string subs = getEnv("NIX_SUBSTITUTERS", "default");
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if (subs == "default") {
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substituters.push_back(nixLibexecDir + "/nix/substituters/copy-from-other-stores.pl");
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substituters.push_back(nixLibexecDir + "/nix/substituters/download-using-manifests.pl");
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substituters.push_back(nixLibexecDir + "/nix/substituters/download-from-binary-cache.pl");
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} else
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substituters = tokenizeString(subs, ":");
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/* Get some settings from the configuration file. */
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thisSystem = querySetting("system", SYSTEM);
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maxBuildJobs = queryIntSetting("build-max-jobs", 1);
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buildCores = queryIntSetting("build-cores", 1);
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maxSilentTime = queryIntSetting("build-max-silent-time", 0);
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buildTimeout = queryIntSetting("build-timeout", 0);
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}
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string packSettings()
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string Settings::pack()
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{
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string s;
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if (!settingsRead) readSettings();
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foreach (Settings::iterator, i, settings) {
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s += i->first; s += '='; s += concatStringsSep(" ", i->second); s += '\n';
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foreach (SettingsMap::iterator, i, settings) {
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s += i->first; s += '='; s += i->second; s += '\n';
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}
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return s;
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}
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