tvl-depot/src/libstore/globals.cc
Eelco Dolstra c1f04fae35 Implement a TTL on cached fetchurl/fetchTarball results
This is because we don't want to do HTTP requests on every evaluation,
even though we can prevent a full redownload via the cached ETag. The
default is one hour.
2015-04-09 11:55:36 +02:00

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#include "config.h"
#include "globals.hh"
#include "util.hh"
#include "archive.hh"
#include <map>
#include <algorithm>
#include <unistd.h>
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"
Settings settings;
Settings::Settings()
{
keepFailed = false;
keepGoing = false;
tryFallback = false;
buildVerbosity = lvlError;
maxBuildJobs = 1;
buildCores = 1;
#ifdef _SC_NPROCESSORS_ONLN
long res = sysconf(_SC_NPROCESSORS_ONLN);
if (res > 0) buildCores = res;
#endif
readOnlyMode = false;
thisSystem = SYSTEM;
maxSilentTime = 0;
buildTimeout = 0;
useBuildHook = true;
printBuildTrace = false;
reservedSize = 1024 * 1024;
fsyncMetadata = true;
useSQLiteWAL = true;
syncBeforeRegistering = false;
useSubstitutes = true;
buildUsersGroup = getuid() == 0 ? "nixbld" : "";
useSshSubstituter = true;
impersonateLinux26 = false;
keepLog = true;
compressLog = true;
maxLogSize = 0;
cacheFailure = false;
pollInterval = 5;
checkRootReachability = false;
gcKeepOutputs = false;
gcKeepDerivations = true;
autoOptimiseStore = false;
envKeepDerivations = false;
lockCPU = getEnv("NIX_AFFINITY_HACK", "1") == "1";
showTrace = false;
enableImportNative = false;
}
void Settings::processEnvironment()
{
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));
nixDaemonSocketFile = canonPath(nixStateDir + DEFAULT_SOCKET_PATH);
}
void Settings::loadConfFile()
{
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);
vector<string> tokens = tokenizeString<vector<string> >(line);
if (tokens.empty()) continue;
if (tokens.size() < 2 || tokens[1] != "=")
throw Error(format("illegal configuration line %1% in %2%") % line % settingsFile);
string name = tokens[0];
vector<string>::iterator i = tokens.begin();
advance(i, 2);
settings[name] = concatStringsSep(" ", Strings(i, tokens.end())); // FIXME: slow
};
}
void Settings::set(const string & name, const string & value)
{
settings[name] = value;
overrides[name] = value;
}
string Settings::get(const string & name, const string & def)
{
auto i = settings.find(name);
if (i == settings.end()) return def;
return i->second;
}
Strings Settings::get(const string & name, const Strings & def)
{
auto i = settings.find(name);
if (i == settings.end()) return def;
return tokenizeString<Strings>(i->second);
}
bool Settings::get(const string & name, bool def)
{
bool res = def;
_get(res, name);
return res;
}
int Settings::get(const string & name, int def)
{
int res = def;
_get(res, name);
return res;
}
void Settings::update()
{
_get(tryFallback, "build-fallback");
_get(maxBuildJobs, "build-max-jobs");
_get(buildCores, "build-cores");
_get(thisSystem, "system");
_get(maxSilentTime, "build-max-silent-time");
_get(buildTimeout, "build-timeout");
_get(reservedSize, "gc-reserved-space");
_get(fsyncMetadata, "fsync-metadata");
_get(useSQLiteWAL, "use-sqlite-wal");
_get(syncBeforeRegistering, "sync-before-registering");
_get(useSubstitutes, "build-use-substitutes");
_get(buildUsersGroup, "build-users-group");
_get(impersonateLinux26, "build-impersonate-linux-26");
_get(keepLog, "build-keep-log");
_get(compressLog, "build-compress-log");
_get(maxLogSize, "build-max-log-size");
_get(cacheFailure, "build-cache-failure");
_get(pollInterval, "build-poll-interval");
_get(checkRootReachability, "gc-check-reachability");
_get(gcKeepOutputs, "gc-keep-outputs");
_get(gcKeepDerivations, "gc-keep-derivations");
_get(autoOptimiseStore, "auto-optimise-store");
_get(envKeepDerivations, "env-keep-derivations");
_get(sshSubstituterHosts, "ssh-substituter-hosts");
_get(useSshSubstituter, "use-ssh-substituter");
_get(logServers, "log-servers");
_get(enableImportNative, "allow-unsafe-native-code-during-evaluation");
_get(useCaseHack, "use-case-hack");
string subs = getEnv("NIX_SUBSTITUTERS", "default");
if (subs == "default") {
substituters.clear();
#if 0
if (getEnv("NIX_OTHER_STORES") != "")
substituters.push_back(nixLibexecDir + "/nix/substituters/copy-from-other-stores.pl");
#endif
substituters.push_back(nixLibexecDir + "/nix/substituters/download-using-manifests.pl");
substituters.push_back(nixLibexecDir + "/nix/substituters/download-from-binary-cache.pl");
if (useSshSubstituter && !sshSubstituterHosts.empty())
substituters.push_back(nixLibexecDir + "/nix/substituters/download-via-ssh");
} else
substituters = tokenizeString<Strings>(subs, ":");
}
void Settings::_get(string & res, const string & name)
{
SettingsMap::iterator i = settings.find(name);
if (i == settings.end()) return;
res = i->second;
}
void Settings::_get(bool & res, const string & name)
{
SettingsMap::iterator i = settings.find(name);
if (i == settings.end()) return;
if (i->second == "true") res = true;
else if (i->second == "false") res = false;
else throw Error(format("configuration option %1% should be either true or false, not %2%")
% name % i->second);
}
void Settings::_get(StringSet & res, const string & name)
{
SettingsMap::iterator i = settings.find(name);
if (i == settings.end()) return;
res.clear();
Strings ss = tokenizeString<Strings>(i->second);
res.insert(ss.begin(), ss.end());
}
void Settings::_get(Strings & res, const string & name)
{
SettingsMap::iterator i = settings.find(name);
if (i == settings.end()) return;
res = tokenizeString<Strings>(i->second);
}
template<class N> void Settings::_get(N & res, const string & name)
{
SettingsMap::iterator i = settings.find(name);
if (i == settings.end()) return;
if (!string2Int(i->second, res))
throw Error(format("configuration setting %1% should have an integer value") % name);
}
string Settings::pack()
{
string s;
foreach (SettingsMap::iterator, i, settings) {
if (i->first.find('\n') != string::npos ||
i->first.find('=') != string::npos ||
i->second.find('\n') != string::npos)
throw Error("illegal option name/value");
s += i->first; s += '='; s += i->second; s += '\n';
}
return s;
}
void Settings::unpack(const string & pack) {
Strings lines = tokenizeString<Strings>(pack, "\n");
foreach (Strings::iterator, i, lines) {
string::size_type eq = i->find('=');
if (eq == string::npos)
throw Error("illegal option name/value");
set(i->substr(0, eq), i->substr(eq + 1));
}
}
Settings::SettingsMap Settings::getOverrides()
{
return overrides;
}
const string nixVersion = PACKAGE_VERSION;
}