#pragma once
#include <limits>
#include <map>
#include <sys/types.h>
#include "libutil/config.hh"
#include "libutil/types.hh"
#include "libutil/util.hh"
#include "nix_config.h"
namespace nix {
typedef enum { smEnabled, smRelaxed, smDisabled } SandboxMode;
struct MaxBuildJobsSetting : public BaseSetting<unsigned int> {
MaxBuildJobsSetting(Config* options, unsigned int def,
const std::string& name, const std::string& description,
const std::set<std::string>& aliases = {})
: BaseSetting<unsigned int>(def, name, description, aliases) {
options->addSetting(this);
}
void set(const std::string& str) override;
};
class Settings : public Config {
static unsigned int getDefaultCores();
static StringSet getDefaultSystemFeatures();
public:
Settings();
Path nixPrefix;
/* The directory where we store sources and derived files. */
Path nixStore;
Path nixDataDir; /* !!! fix */
/* The directory where we log various operations. */
Path nixLogDir;
/* The directory where state is stored. */
Path nixStateDir;
/* The directory where configuration files are stored. */
Path nixConfDir;
/* The directory where internal helper programs are stored. */
Path nixLibexecDir;
/* The directory where the main programs are stored. */
Path nixBinDir;
/* The directory where the man pages are stored. */
Path nixManDir;
/* File name of the socket the daemon listens to. */
Path nixDaemonSocketFile;
Setting<std::string> storeUri{this, getEnv("NIX_REMOTE", "auto"), "store",
"The default Nix store to use."};
Setting<bool> keepFailed{
this, false, "keep-failed",
"Whether to keep temporary directories of failed builds."};
Setting<bool> keepGoing{
this, false, "keep-going",
"Whether to keep building derivations when another build fails."};
Setting<bool> tryFallback{
this,
false,
"fallback",
"Whether to fall back to building when substitution fails.",
{"build-fallback"}};
/* Whether to show build log output in real time. */
bool verboseBuild = true;
Setting<size_t> logLines{
this, 10, "log-lines",
"If verbose-build is false, the number of lines of the tail of "
"the log to show if a build fails."};
MaxBuildJobsSetting maxBuildJobs{this,
1,
"max-jobs",
"Maximum number of parallel build jobs. "
"\"auto\" means use number of cores.",
{"build-max-jobs"}};
Setting<unsigned int> buildCores{
this,
getDefaultCores(),
"cores",
"Number of CPU cores to utilize in parallel within a build, "
"i.e. by passing this number to Make via '-j'. 0 means that the "
"number of actual CPU cores on the local host ought to be "
"auto-detected.",
{"build-cores"}};
/* Read-only mode. Don't copy stuff to the store, don't change
the database. */
bool readOnlyMode = false;
Setting<std::string> thisSystem{this, SYSTEM, "system",
"The canonical Nix system name."};
Setting<time_t> maxSilentTime{
this,
0,
"max-silent-time",
"The maximum time in seconds that a builer can go without "
"producing any output on stdout/stderr before it is killed. "
"0 means infinity.",
{"build-max-silent-time"}};
Setting<time_t> buildTimeout{
this,
0,
"timeout",
"The maximum duration in seconds that a builder can run. "
"0 means infinity.",
{"build-timeout"}};
PathSetting buildHook{this, true, nixLibexecDir + "/nix/build-remote",
"build-hook",
"The path of the helper program that executes builds "
"to remote machines."};
Setting<std::string> builders{this, "@" + nixConfDir + "/machines",
"builders",
"A semicolon-separated list of build machines, "
"in the format of nix.machines."};
Setting<bool> buildersUseSubstitutes{
this, false, "builders-use-substitutes",
"Whether build machines should use their own substitutes for obtaining "
"build dependencies if possible, rather than waiting for this host to "
"upload them."};
Setting<off_t> reservedSize{
this, 8 * 1024 * 1024, "gc-reserved-space",
"Amount of reserved disk space for the garbage collector."};
Setting<bool> fsyncMetadata{this, true, "fsync-metadata",
"Whether SQLite should use fsync()."};
Setting<bool> useSQLiteWAL{this, true, "use-sqlite-wal",
"Whether SQLite should use WAL mode."};
Setting<bool> syncBeforeRegistering{
this, false, "sync-before-registering",
"Whether to call sync() before registering a path as valid."};
Setting<bool> useSubstitutes{this,
true,
"substitute",
"Whether to use substitutes.",
{"build-use-substitutes"}};
Setting<std::string> buildUsersGroup{
this, "", "build-users-group",
"The Unix group that contains the build users."};
Setting<bool> impersonateLinux26{
this,
false,
"impersonate-linux-26",
"Whether to impersonate a Linux 2.6 machine on newer kernels.",
{"build-impersonate-linux-26"}};
Setting<bool> keepLog{this,
true,
"keep-build-log",
"Whether to store build logs.",
{"build-keep-log"}};
Setting<bool> compressLog{this,
true,
"compress-build-log",
"Whether to compress logs.",
{"build-compress-log"}};
Setting<unsigned long> maxLogSize{
this,
0,
"max-build-log-size",
"Maximum number of bytes a builder can write to stdout/stderr "
"before being killed (0 means no limit).",
{"build-max-log-size"}};
/* When buildRepeat > 0 and verboseBuild == true, whether to print
repeated builds (i.e. builds other than the first one) to
stderr. Hack to prevent Hydra logs from being polluted. */
bool printRepeatedBuilds = true;
Setting<unsigned int> pollInterval{
this, 5, "build-poll-interval",
"How often (in seconds) to poll for locks."};
Setting<bool> checkRootReachability{
this, false, "gc-check-reachability",
"Whether to check if new GC roots can in fact be found by the "
"garbage collector."};
Setting<bool> gcKeepOutputs{
this,
false,
"keep-outputs",
"Whether the garbage collector should keep outputs of live derivations.",
{"gc-keep-outputs"}};
Setting<bool> gcKeepDerivations{
this,
true,
"keep-derivations",
"Whether the garbage collector should keep derivers of live paths.",
{"gc-keep-derivations"}};
Setting<bool> autoOptimiseStore{this, false, "auto-optimise-store",
"Whether to automatically replace files with "
"identical contents with hard links."};
Setting<bool> envKeepDerivations{
this,
false,
"keep-env-derivations",
"Whether to add derivations as a dependency of user environments "
"(to prevent them from being GCed).",
{"env-keep-derivations"}};
/* Whether to lock the Nix client and worker to the same CPU. */
bool lockCPU;
/* Whether to show a stack trace if Nix evaluation fails. */
Setting<bool> showTrace{
this, false, "show-trace",
"Whether to show a stack trace on evaluation errors."};
Setting<SandboxMode> sandboxMode {
this,
#if __linux__
smEnabled
#else
smDisabled
#endif
,
"sandbox",
"Whether to enable sandboxed builds. Can be \"true\", \"false\" or "
"\"relaxed\".",
{
"build-use-chroot", "build-use-sandbox"
}
};
Setting<PathSet> sandboxPaths{
this,
{},
"sandbox-paths",
"The paths to make available inside the build sandbox.",
{"build-chroot-dirs", "build-sandbox-paths"}};
Setting<bool> sandboxFallback{
this, true, "sandbox-fallback",
"Whether to disable sandboxing when the kernel doesn't allow it."};
Setting<PathSet> extraSandboxPaths{
this,
{},
"extra-sandbox-paths",
"Additional paths to make available inside the build sandbox.",
{"build-extra-chroot-dirs", "build-extra-sandbox-paths"}};
Setting<size_t> buildRepeat{
this,
0,
"repeat",
"The number of times to repeat a build in order to verify determinism.",
{"build-repeat"}};
#if __linux__
Setting<std::string> sandboxShmSize{
this, "50%", "sandbox-dev-shm-size",
"The size of /dev/shm in the build sandbox."};
Setting<Path> sandboxBuildDir{this, "/build", "sandbox-build-dir",
"The build directory inside the sandbox."};
#endif
Setting<PathSet> allowedImpureHostPrefixes{
this,
{},
"allowed-impure-host-deps",
"Which prefixes to allow derivations to ask for access to (primarily for "
"Darwin)."};
Setting<bool> runDiffHook{
this, false, "run-diff-hook",
"Whether to run the program specified by the diff-hook setting "
"repeated builds produce a different result. Typically used to "
"plug in diffoscope."};
PathSetting diffHook{
this, true, "", "diff-hook",
"A program that prints out the differences between the two paths "
"specified on its command line."};
Setting<bool> enforceDeterminism{
this, true, "enforce-determinism",
"Whether to fail if repeated builds produce different output."};
Setting<Strings> trustedPublicKeys{
this,
{"cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY="},
"trusted-public-keys",
"Trusted public keys for secure substitution.",
{"binary-cache-public-keys"}};
Setting<Strings> secretKeyFiles{
this,
{},
"secret-key-files",
"Secret keys with which to sign local builds."};
Setting<unsigned int> tarballTtl{
this, 60 * 60, "tarball-ttl",
"How long downloaded files are considered up-to-date."};
Setting<bool> requireSigs{
this, true, "require-sigs",
"Whether to check that any non-content-addressed path added to the "
"Nix store has a valid signature (that is, one signed using a key "
"listed in 'trusted-public-keys'."};
Setting<StringSet> extraPlatforms{
this,
std::string{SYSTEM} == "x86_64-linux" ? StringSet{"i686-linux"}
: StringSet{},
"extra-platforms",
"Additional platforms that can be built on the local system. "
"These may be supported natively (e.g. armv7 on some aarch64 CPUs "
"or using hacks like qemu-user."};
Setting<StringSet> systemFeatures{
this, getDefaultSystemFeatures(), "system-features",
"Optional features that this system implements (like \"kvm\")."};
Setting<Strings> substituters{
this,
nixStore == "/nix/store" ? Strings{"https://cache.nixos.org/"}
: Strings(),
"substituters",
"The URIs of substituters (such as https://cache.nixos.org/).",
{"binary-caches"}};
// FIXME: provide a way to add to option values.
Setting<Strings> extraSubstituters{this,
{},
"extra-substituters",
"Additional URIs of substituters.",
{"extra-binary-caches"}};
Setting<StringSet> trustedSubstituters{
this,
{},
"trusted-substituters",
"Disabled substituters that may be enabled via the substituters option "
"by untrusted users.",
{"trusted-binary-caches"}};
Setting<Strings> trustedUsers{this,
{"root"},
"trusted-users",
"Which users or groups are trusted to ask the "
"daemon to do unsafe things."};
Setting<unsigned int> ttlNegativeNarInfoCache{
this, 3600, "narinfo-cache-negative-ttl",
"The TTL in seconds for negative lookups in the disk cache i.e binary "
"cache lookups that "
"return an invalid path result"};
Setting<unsigned int> ttlPositiveNarInfoCache{
this, 30 * 24 * 3600, "narinfo-cache-positive-ttl",
"The TTL in seconds for positive lookups in the disk cache i.e binary "
"cache lookups that "
"return a valid path result."};
/* ?Who we trust to use the daemon in safe ways */
Setting<Strings> allowedUsers{
this,
{"*"},
"allowed-users",
"Which users or groups are allowed to connect to the daemon."};
Setting<bool> printMissing{
this, true, "print-missing",
"Whether to print what paths need to be built or downloaded."};
Setting<std::string> preBuildHook{
this, "", "pre-build-hook",
"A program to run just before a build to set derivation-specific build "
"settings."};
Setting<std::string> postBuildHook{
this, "", "post-build-hook",
"A program to run just after each successful build."};
Setting<std::string> netrcFile{this, fmt("%s/%s", nixConfDir, "netrc"),
"netrc-file",
"Path to the netrc file used to obtain "
"usernames/passwords for downloads."};
/* Path to the SSL CA file used */
Path caFile;
#if __linux__
Setting<bool> filterSyscalls{
this, true, "filter-syscalls",
"Whether to prevent certain dangerous system calls, such as "
"creation of setuid/setgid files or adding ACLs or extended "
"attributes. Only disable this if you're aware of the "
"security implications."};
Setting<bool> allowNewPrivileges{
this, false, "allow-new-privileges",
"Whether builders can acquire new privileges by calling programs with "
"setuid/setgid bits or with file capabilities."};
#endif
Setting<Strings> hashedMirrors{
this,
{"http://tarballs.nixos.org/"},
"hashed-mirrors",
"A list of servers used by builtins.fetchurl to fetch files by hash."};
Setting<uint64_t> minFree{this, 0, "min-free",
"Automatically run the garbage collector when free "
"disk space drops below the specified amount."};
Setting<uint64_t> maxFree{this, std::numeric_limits<uint64_t>::max(),
"max-free",
"Stop deleting garbage when free disk space is "
"above the specified amount."};
Setting<uint64_t> minFreeCheckInterval{
this, 5, "min-free-check-interval",
"Number of seconds between checking free disk space."};
Setting<Paths> pluginFiles{
this,
{},
"plugin-files",
"Plugins to dynamically load at nix initialization time."};
};
// FIXME: don't use a global variable.
extern Settings settings;
/* This should be called after settings are initialized, but before
anything else */
void initPlugins();
void loadConfFile();
extern const std::string nixVersion;
} // namespace nix
