guix/src/libstore/globals.cc
Eelco Dolstra 993fa94fb4 * Move initialisation of variables like nixConfDir from libmain to
libstore so that the Perl bindings can use it as well.  It's vital
  that the Perl bindings use the configuration file, because otherwise
  nix-copy-closure will fail with a ‘database locked’ message if the
  value of ‘use-sqlite-wal’ is changed from the default.
2011-11-22 17:28:41 +00:00

173 lines
4.5 KiB
C++

#include "config.h"
#include "globals.hh"
#include "util.hh"
#include <map>
#include <algorithm>
namespace nix {
string nixStore = "/UNINIT";
string nixDataDir = "/UNINIT";
string nixLogDir = "/UNINIT";
string nixStateDir = "/UNINIT";
string nixDBPath = "/UNINIT";
string nixConfDir = "/UNINIT";
string nixLibexecDir = "/UNINIT";
string nixBinDir = "/UNINIT";
bool keepFailed = false;
bool keepGoing = false;
bool tryFallback = false;
Verbosity buildVerbosity = lvlError;
unsigned int maxBuildJobs = 1;
unsigned int buildCores = 1;
bool readOnlyMode = false;
string thisSystem = "unset";
time_t maxSilentTime = 0;
time_t buildTimeout = 0;
Paths substituters;
bool useBuildHook = true;
bool printBuildTrace = false;
static bool settingsRead = false;
static std::map<string, Strings> settings;
/* Overriden settings. */
std::map<string, Strings> settingsCmdline;
string & at(Strings & ss, unsigned int n)
{
Strings::iterator i = ss.begin();
advance(i, n);
return *i;
}
static void readSettings()
{
Path settingsFile = (format("%1%/%2%") % nixConfDir % "nix.conf").str();
if (!pathExists(settingsFile)) return;
string contents = readFile(settingsFile);
unsigned int pos = 0;
while (pos < contents.size()) {
string line;
while (pos < contents.size() && contents[pos] != '\n')
line += contents[pos++];
pos++;
string::size_type hash = line.find('#');
if (hash != string::npos)
line = string(line, 0, hash);
Strings tokens = tokenizeString(line);
if (tokens.empty()) continue;
if (tokens.size() < 2 || at(tokens, 1) != "=")
throw Error(format("illegal configuration line `%1%' in `%2%'") % line % settingsFile);
string name = at(tokens, 0);
Strings::iterator i = tokens.begin();
advance(i, 2);
settings[name] = Strings(i, tokens.end());
};
settings.insert(settingsCmdline.begin(), settingsCmdline.end());
settingsRead = true;
}
Strings querySetting(const string & name, const Strings & def)
{
if (!settingsRead) readSettings();
std::map<string, Strings>::iterator i = settings.find(name);
return i == settings.end() ? def : i->second;
}
string querySetting(const string & name, const string & def)
{
Strings defs;
defs.push_back(def);
Strings value = querySetting(name, defs);
if (value.size() != 1)
throw Error(format("configuration option `%1%' should not be a list") % name);
return value.front();
}
bool queryBoolSetting(const string & name, bool def)
{
string v = querySetting(name, def ? "true" : "false");
if (v == "true") return true;
else if (v == "false") return false;
else throw Error(format("configuration option `%1%' should be either `true' or `false', not `%2%'")
% name % v);
}
unsigned int queryIntSetting(const string & name, unsigned int def)
{
int n;
if (!string2Int(querySetting(name, int2String(def)), n) || n < 0)
throw Error(format("configuration setting `%1%' should have an integer value") % name);
return n;
}
void overrideSetting(const string & name, const Strings & value)
{
if (settingsRead) settings[name] = value;
settingsCmdline[name] = value;
}
void reloadSettings()
{
settingsRead = false;
settings.clear();
}
void setDefaultsFromEnvironment()
{
/* Setup Nix paths. */
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));
nixDBPath = getEnv("NIX_DB_DIR", nixStateDir + "/db");
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));
string subs = getEnv("NIX_SUBSTITUTERS", "default");
if (subs == "default") {
substituters.push_back(nixLibexecDir + "/nix/substituters/copy-from-other-stores.pl");
substituters.push_back(nixLibexecDir + "/nix/substituters/download-using-manifests.pl");
} else
substituters = tokenizeString(subs, ":");
/* Get some settings from the configuration file. */
thisSystem = querySetting("system", SYSTEM);
maxBuildJobs = queryIntSetting("build-max-jobs", 1);
buildCores = queryIntSetting("build-cores", 1);
maxSilentTime = queryIntSetting("build-max-silent-time", 0);
buildTimeout = queryIntSetting("build-timeout", 0);
}
}