forked from lix-project/lix
357 lines
10 KiB
C++
357 lines
10 KiB
C++
#include "common-args.hh"
|
||
#include "globals.hh"
|
||
#include "shared.hh"
|
||
#include "store-api.hh"
|
||
#include "util.hh"
|
||
|
||
#include <algorithm>
|
||
#include <cctype>
|
||
#include <exception>
|
||
#include <iostream>
|
||
#include <mutex>
|
||
|
||
#include <cstdlib>
|
||
#include <sys/time.h>
|
||
#include <sys/stat.h>
|
||
#include <unistd.h>
|
||
#include <signal.h>
|
||
|
||
#include <openssl/crypto.h>
|
||
|
||
|
||
namespace nix {
|
||
|
||
|
||
static bool gcWarning = true;
|
||
|
||
void printGCWarning()
|
||
{
|
||
if (!gcWarning) return;
|
||
static bool haveWarned = false;
|
||
warnOnce(haveWarned,
|
||
"you did not specify ‘--add-root’; "
|
||
"the result might be removed by the garbage collector");
|
||
}
|
||
|
||
|
||
void printMissing(ref<Store> store, const PathSet & paths)
|
||
{
|
||
unsigned long long downloadSize, narSize;
|
||
PathSet willBuild, willSubstitute, unknown;
|
||
store->queryMissing(paths, willBuild, willSubstitute, unknown, downloadSize, narSize);
|
||
printMissing(store, willBuild, willSubstitute, unknown, downloadSize, narSize);
|
||
}
|
||
|
||
|
||
void printMissing(ref<Store> store, const PathSet & willBuild,
|
||
const PathSet & willSubstitute, const PathSet & unknown,
|
||
unsigned long long downloadSize, unsigned long long narSize)
|
||
{
|
||
if (!willBuild.empty()) {
|
||
printInfo(format("these derivations will be built:"));
|
||
Paths sorted = store->topoSortPaths(willBuild);
|
||
reverse(sorted.begin(), sorted.end());
|
||
for (auto & i : sorted)
|
||
printInfo(format(" %1%") % i);
|
||
}
|
||
|
||
if (!willSubstitute.empty()) {
|
||
printInfo(format("these paths will be fetched (%.2f MiB download, %.2f MiB unpacked):")
|
||
% (downloadSize / (1024.0 * 1024.0))
|
||
% (narSize / (1024.0 * 1024.0)));
|
||
for (auto & i : willSubstitute)
|
||
printInfo(format(" %1%") % i);
|
||
}
|
||
|
||
if (!unknown.empty()) {
|
||
printInfo(format("don't know how to build these paths%1%:")
|
||
% (settings.readOnlyMode ? " (may be caused by read-only store access)" : ""));
|
||
for (auto & i : unknown)
|
||
printInfo(format(" %1%") % i);
|
||
}
|
||
}
|
||
|
||
|
||
string getArg(const string & opt,
|
||
Strings::iterator & i, const Strings::iterator & end)
|
||
{
|
||
++i;
|
||
if (i == end) throw UsageError(format("‘%1%’ requires an argument") % opt);
|
||
return *i;
|
||
}
|
||
|
||
|
||
/* OpenSSL is not thread-safe by default - it will randomly crash
|
||
unless the user supplies a mutex locking function. So let's do
|
||
that. */
|
||
static std::vector<std::mutex> opensslLocks;
|
||
|
||
static void opensslLockCallback(int mode, int type, const char * file, int line)
|
||
{
|
||
if (mode & CRYPTO_LOCK)
|
||
opensslLocks[type].lock();
|
||
else
|
||
opensslLocks[type].unlock();
|
||
}
|
||
|
||
|
||
static void sigHandler(int signo) { }
|
||
|
||
|
||
void initNix()
|
||
{
|
||
/* Turn on buffering for cerr. */
|
||
#if HAVE_PUBSETBUF
|
||
static char buf[1024];
|
||
std::cerr.rdbuf()->pubsetbuf(buf, sizeof(buf));
|
||
#endif
|
||
|
||
logger = makeDefaultLogger();
|
||
|
||
/* Initialise OpenSSL locking. */
|
||
opensslLocks = std::vector<std::mutex>(CRYPTO_num_locks());
|
||
CRYPTO_set_locking_callback(opensslLockCallback);
|
||
|
||
settings.loadConfFile();
|
||
|
||
startSignalHandlerThread();
|
||
|
||
/* Reset SIGCHLD to its default. */
|
||
struct sigaction act;
|
||
sigemptyset(&act.sa_mask);
|
||
act.sa_handler = SIG_DFL;
|
||
act.sa_flags = 0;
|
||
if (sigaction(SIGCHLD, &act, 0))
|
||
throw SysError("resetting SIGCHLD");
|
||
|
||
/* Install a dummy SIGUSR1 handler for use with pthread_kill(). */
|
||
act.sa_handler = sigHandler;
|
||
if (sigaction(SIGUSR1, &act, 0)) throw SysError("handling SIGUSR1");
|
||
|
||
/* Register a SIGSEGV handler to detect stack overflows. */
|
||
detectStackOverflow();
|
||
|
||
/* There is no privacy in the Nix system ;-) At least not for
|
||
now. In particular, store objects should be readable by
|
||
everybody. */
|
||
umask(0022);
|
||
|
||
/* Initialise the PRNG. */
|
||
struct timeval tv;
|
||
gettimeofday(&tv, 0);
|
||
srandom(tv.tv_usec);
|
||
|
||
if (char *pack = getenv("_NIX_OPTIONS"))
|
||
settings.unpack(pack);
|
||
}
|
||
|
||
|
||
struct LegacyArgs : public MixCommonArgs
|
||
{
|
||
std::function<bool(Strings::iterator & arg, const Strings::iterator & end)> parseArg;
|
||
|
||
LegacyArgs(const std::string & programName,
|
||
std::function<bool(Strings::iterator & arg, const Strings::iterator & end)> parseArg)
|
||
: MixCommonArgs(programName), parseArg(parseArg)
|
||
{
|
||
mkFlag('Q', "no-build-output", "do not show build output",
|
||
&settings.verboseBuild, false);
|
||
|
||
mkFlag('K', "keep-failed", "keep temporary directories of failed builds",
|
||
&settings.keepFailed);
|
||
|
||
mkFlag('k', "keep-going", "keep going after a build fails",
|
||
&settings.keepGoing);
|
||
|
||
mkFlag(0, "fallback", "build from source if substitution fails", []() {
|
||
settings.set("build-fallback", "true");
|
||
});
|
||
|
||
auto intSettingAlias = [&](char shortName, const std::string & longName,
|
||
const std::string & description, const std::string & dest) {
|
||
mkFlag<unsigned int>(shortName, longName, description, [=](unsigned int n) {
|
||
settings.set(dest, std::to_string(n));
|
||
});
|
||
};
|
||
|
||
intSettingAlias('j', "max-jobs", "maximum number of parallel builds", "build-max-jobs");
|
||
intSettingAlias(0, "cores", "maximum number of CPU cores to use inside a build", "build-cores");
|
||
intSettingAlias(0, "max-silent-time", "number of seconds of silence before a build is killed", "build-max-silent-time");
|
||
intSettingAlias(0, "timeout", "number of seconds before a build is killed", "build-timeout");
|
||
|
||
mkFlag(0, "readonly-mode", "do not write to the Nix store",
|
||
&settings.readOnlyMode);
|
||
|
||
mkFlag(0, "no-build-hook", "disable use of the build hook mechanism",
|
||
&settings.useBuildHook, false);
|
||
|
||
mkFlag(0, "show-trace", "show Nix expression stack trace in evaluation errors",
|
||
&settings.showTrace);
|
||
|
||
mkFlag(0, "no-gc-warning", "disable warning about not using ‘--add-root’",
|
||
&gcWarning, false);
|
||
}
|
||
|
||
bool processFlag(Strings::iterator & pos, Strings::iterator end) override
|
||
{
|
||
if (MixCommonArgs::processFlag(pos, end)) return true;
|
||
bool res = parseArg(pos, end);
|
||
if (res) ++pos;
|
||
return res;
|
||
}
|
||
|
||
bool processArgs(const Strings & args, bool finish) override
|
||
{
|
||
if (args.empty()) return true;
|
||
assert(args.size() == 1);
|
||
Strings ss(args);
|
||
auto pos = ss.begin();
|
||
if (!parseArg(pos, ss.end()))
|
||
throw UsageError(format("unexpected argument ‘%1%’") % args.front());
|
||
return true;
|
||
}
|
||
};
|
||
|
||
|
||
void parseCmdLine(int argc, char * * argv,
|
||
std::function<bool(Strings::iterator & arg, const Strings::iterator & end)> parseArg)
|
||
{
|
||
LegacyArgs(baseNameOf(argv[0]), parseArg).parseCmdline(argvToStrings(argc, argv));
|
||
settings.update();
|
||
}
|
||
|
||
|
||
void printVersion(const string & programName)
|
||
{
|
||
std::cout << format("%1% (Nix) %2%") % programName % nixVersion << std::endl;
|
||
if (verbosity > lvlInfo) {
|
||
Strings cfg;
|
||
#if HAVE_BOEHMGC
|
||
cfg.push_back("gc");
|
||
#endif
|
||
#if HAVE_SODIUM
|
||
cfg.push_back("signed-caches");
|
||
#endif
|
||
std::cout << "Features: " << concatStringsSep(", ", cfg) << "\n";
|
||
std::cout << "Configuration file: " << settings.nixConfDir + "/nix.conf" << "\n";
|
||
std::cout << "Store directory: " << settings.nixStore << "\n";
|
||
std::cout << "State directory: " << settings.nixStateDir << "\n";
|
||
}
|
||
throw Exit();
|
||
}
|
||
|
||
|
||
void showManPage(const string & name)
|
||
{
|
||
restoreSignals();
|
||
execlp("man", "man", name.c_str(), NULL);
|
||
throw SysError(format("command ‘man %1%’ failed") % name.c_str());
|
||
}
|
||
|
||
|
||
int handleExceptions(const string & programName, std::function<void()> fun)
|
||
{
|
||
ReceiveInterrupts receiveInterrupts; // FIXME: need better place for this
|
||
|
||
string error = ANSI_RED "error:" ANSI_NORMAL " ";
|
||
try {
|
||
try {
|
||
fun();
|
||
} catch (...) {
|
||
/* Subtle: we have to make sure that any `interrupted'
|
||
condition is discharged before we reach printMsg()
|
||
below, since otherwise it will throw an (uncaught)
|
||
exception. */
|
||
interruptThrown = true;
|
||
throw;
|
||
}
|
||
} catch (Exit & e) {
|
||
return e.status;
|
||
} catch (UsageError & e) {
|
||
printError(
|
||
format(error + "%1%\nTry ‘%2% --help’ for more information.")
|
||
% e.what() % programName);
|
||
return 1;
|
||
} catch (BaseError & e) {
|
||
printError(format(error + "%1%%2%") % (settings.showTrace ? e.prefix() : "") % e.msg());
|
||
if (e.prefix() != "" && !settings.showTrace)
|
||
printError("(use ‘--show-trace’ to show detailed location information)");
|
||
return e.status;
|
||
} catch (std::bad_alloc & e) {
|
||
printError(error + "out of memory");
|
||
return 1;
|
||
} catch (std::exception & e) {
|
||
printError(error + e.what());
|
||
return 1;
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
|
||
RunPager::RunPager()
|
||
{
|
||
if (!isatty(STDOUT_FILENO)) return;
|
||
char * pager = getenv("NIX_PAGER");
|
||
if (!pager) pager = getenv("PAGER");
|
||
if (pager && ((string) pager == "" || (string) pager == "cat")) return;
|
||
|
||
Pipe toPager;
|
||
toPager.create();
|
||
|
||
pid = startProcess([&]() {
|
||
if (dup2(toPager.readSide.get(), STDIN_FILENO) == -1)
|
||
throw SysError("dupping stdin");
|
||
if (!getenv("LESS"))
|
||
setenv("LESS", "FRSXMK", 1);
|
||
restoreSignals();
|
||
if (pager)
|
||
execl("/bin/sh", "sh", "-c", pager, NULL);
|
||
execlp("pager", "pager", NULL);
|
||
execlp("less", "less", NULL);
|
||
execlp("more", "more", NULL);
|
||
throw SysError(format("executing ‘%1%’") % pager);
|
||
});
|
||
|
||
pid.setKillSignal(SIGINT);
|
||
|
||
if (dup2(toPager.writeSide.get(), STDOUT_FILENO) == -1)
|
||
throw SysError("dupping stdout");
|
||
}
|
||
|
||
|
||
RunPager::~RunPager()
|
||
{
|
||
try {
|
||
if (pid != -1) {
|
||
std::cout.flush();
|
||
close(STDOUT_FILENO);
|
||
pid.wait();
|
||
}
|
||
} catch (...) {
|
||
try {
|
||
pid.kill(true);
|
||
} catch (...) {
|
||
ignoreException();
|
||
}
|
||
}
|
||
}
|
||
|
||
|
||
string showBytes(unsigned long long bytes)
|
||
{
|
||
return (format("%.2f MiB") % (bytes / (1024.0 * 1024.0))).str();
|
||
}
|
||
|
||
|
||
PrintFreed::~PrintFreed()
|
||
{
|
||
if (show)
|
||
std::cout << format("%1% store paths deleted, %2% freed\n")
|
||
% results.paths.size()
|
||
% showBytes(results.bytesFreed);
|
||
}
|
||
|
||
|
||
}
|