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https://github.com/privatevoid-net/nix-super.git
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cacff1be88
poll for it (i.e. if we can't acquire the lock, then let the main select() loop wait for at most a few seconds and then try again). This improves parallelism: if two nix-store processes are both trying to build a path at the same time, the second one shouldn't block; it should first see if it can build other goals. Also, it prevents the deadlocks that have been occuring in Hydra lately, where a process waits for a lock held by another process that's waiting for a lock held by the first. The downside is that polling isn't really elegant, but POSIX doesn't provide a way to wait for locks in a select() loop. The only solution would be to spawn a thread for each lock to do a blocking fcntl() and then signal the main thread, but that would require pthreads.
140 lines
3.2 KiB
C++
140 lines
3.2 KiB
C++
#include "globals.hh"
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#include "util.hh"
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#include <map>
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#include <algorithm>
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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 = lvlInfo;
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unsigned int maxBuildJobs = 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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Paths substituters;
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bool useBuildHook = true;
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bool printBuildTrace = false;
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static bool settingsRead = false;
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static std::map<string, Strings> settings;
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/* Overriden settings. */
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std::map<string, Strings> settingsCmdline;
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string & at(Strings & ss, unsigned int n)
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{
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Strings::iterator i = ss.begin();
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advance(i, n);
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return *i;
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}
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static void readSettings()
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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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string contents = readFile(settingsFile);
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unsigned int pos = 0;
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while (pos < contents.size()) {
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string line;
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while (pos < contents.size() && contents[pos] != '\n')
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line += contents[pos++];
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pos++;
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string::size_type hash = line.find('#');
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if (hash != string::npos)
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line = string(line, 0, hash);
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Strings tokens = tokenizeString(line);
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if (tokens.empty()) continue;
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if (tokens.size() < 2 || at(tokens, 1) != "=")
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throw Error(format("illegal configuration line `%1%' in `%2%'") % line % settingsFile);
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string name = at(tokens, 0);
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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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};
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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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{
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if (!settingsRead) readSettings();
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std::map<string, Strings>::iterator i = settings.find(name);
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return i == settings.end() ? def : i->second;
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}
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string querySetting(const string & name, const string & def)
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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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}
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bool queryBoolSetting(const string & name, bool def)
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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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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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}
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unsigned int queryIntSetting(const string & name, unsigned int def)
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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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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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}
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