lix/src/libmain/shared.cc

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#include "shared.hh"
#include "globals.hh"
#include "gc.hh"
#include "store.hh"
#include "util.hh"
#include "config.h"
#include <iostream>
#include <cctype>
#include <sys/stat.h>
#include <unistd.h>
#include <aterm2.h>
namespace nix {
volatile sig_atomic_t blockInt = 0;
static void sigintHandler(int signo)
{
if (!blockInt) {
_isInterrupted = 1;
blockInt = 1;
}
}
Path makeRootName(const Path & gcRoot, int & counter)
{
counter++;
if (counter == 1)
return gcRoot;
else
return (format("%1%-%2%") % gcRoot % counter).str();
}
void printGCWarning()
{
static bool haveWarned = false;
warnOnce(haveWarned,
"warning: you did not specify `--add-root'; "
"the result might be removed by the garbage collector");
}
static void setLogType(string lt)
{
if (lt == "pretty") logType = ltPretty;
else if (lt == "escapes") logType = ltEscapes;
else if (lt == "flat") logType = ltFlat;
else throw UsageError("unknown log type");
}
struct RemoveTempRoots
{
~RemoveTempRoots()
{
removeTempRoots();
}
};
void initDerivationsHelpers();
/* Initialize and reorder arguments, then call the actual argument
processor. */
static void initAndRun(int argc, char * * argv)
{
string root = getEnv("NIX_ROOT");
if (root != "") {
if (chroot(root.c_str()) != 0)
throw SysError(format("changing root to `%1%'") % root);
}
/* 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));
/* Get some settings from the configuration file. */
thisSystem = querySetting("system", SYSTEM);
{
int n;
if (!string2Int(querySetting("build-max-jobs", "1"), n) || n < 0)
throw Error("invalid value for configuration setting `build-max-jobs'");
maxBuildJobs = n;
}
/* Catch SIGINT. */
struct sigaction act, oact;
act.sa_handler = sigintHandler;
sigfillset(&act.sa_mask);
act.sa_flags = 0;
if (sigaction(SIGINT, &act, &oact))
throw SysError("installing handler for SIGINT");
if (sigaction(SIGTERM, &act, &oact))
throw SysError("installing handler for SIGTERM");
if (sigaction(SIGHUP, &act, &oact))
throw SysError("installing handler for SIGHUP");
/* Ignore SIGPIPE. */
act.sa_handler = SIG_IGN;
act.sa_flags = 0;
if (sigaction(SIGPIPE, &act, &oact))
throw SysError("ignoring SIGPIPE");
/* There is no privacy in the Nix system ;-) At least not for
now. In particular, store objects should be readable by
everybody. This prevents nasty surprises when using a shared
store (with the setuid() hack). */
umask(0022);
/* Process the NIX_LOG_TYPE environment variable. */
string lt = getEnv("NIX_LOG_TYPE");
if (lt != "") setLogType(lt);
/* ATerm stuff. !!! find a better place to put this */
initDerivationsHelpers();
/* Put the arguments in a vector. */
Strings args, remaining;
while (argc--) args.push_back(*argv++);
args.erase(args.begin());
/* Expand compound dash options (i.e., `-qlf' -> `-q -l -f'), and
ignore options for the ATerm library. */
for (Strings::iterator i = args.begin(); i != args.end(); ++i) {
string arg = *i;
if (string(arg, 0, 4) == "-at-") ;
else if (arg.length() > 2 && arg[0] == '-' && arg[1] != '-') {
for (unsigned int j = 1; j < arg.length(); j++)
if (isalpha(arg[j]))
remaining.push_back((string) "-" + arg[j]);
else {
remaining.push_back(string(arg, j));
break;
}
} else remaining.push_back(arg);
}
args = remaining;
remaining.clear();
/* Process default options. */
for (Strings::iterator i = args.begin(); i != args.end(); ++i) {
string arg = *i;
if (arg == "--verbose" || arg == "-v")
verbosity = (Verbosity) ((int) verbosity + 1);
else if (arg == "--log-type") {
++i;
if (i == args.end()) throw UsageError("`--log-type' requires an argument");
setLogType(*i);
}
else if (arg == "--build-output" || arg == "-B")
; /* !!! obsolete - remove eventually */
else if (arg == "--no-build-output" || arg == "-Q")
buildVerbosity = lvlVomit;
else if (arg == "--help") {
printHelp();
return;
}
else if (arg == "--version") {
std::cout << format("%1% (Nix) %2%") % programId % NIX_VERSION << std::endl;
return;
}
else if (arg == "--keep-failed" || arg == "-K")
keepFailed = true;
else if (arg == "--keep-going" || arg == "-k")
keepGoing = true;
else if (arg == "--fallback")
tryFallback = true;
else if (arg == "--max-jobs" || arg == "-j") {
++i;
if (i == args.end()) throw UsageError("`--max-jobs' requires an argument");
int n;
if (!string2Int(*i, n) || n < 0)
throw UsageError(format("`--max-jobs' requires a non-negative integer"));
maxBuildJobs = n;
}
else if (arg == "--readonly-mode")
readOnlyMode = true;
else remaining.push_back(arg);
}
/* Automatically clean up the temporary roots file when we
exit. */
RemoveTempRoots removeTempRoots; /* unused variable - don't remove */
run(remaining);
closeDB(); /* it's fine if the DB isn't actually open */
}
}
static char buf[1024];
int main(int argc, char * * argv)
{
using namespace nix;
/* If we are setuid root, we have to get rid of the excess
privileges ASAP. */
switchToNixUser();
/* ATerm setup. */
ATerm bottomOfStack;
ATinit(argc, argv, &bottomOfStack);
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/* Turn on buffering for cerr. */
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#if HAVE_PUBSETBUF
std::cerr.rdbuf()->pubsetbuf(buf, sizeof(buf));
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#endif
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try {
try {
initAndRun(argc, argv);
} 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. */
blockInt = 1; /* ignore further SIGINTs */
_isInterrupted = 0;
throw;
}
} catch (UsageError & e) {
printMsg(lvlError,
format(
"error: %1%\n"
"Try `%2% --help' for more information.")
% e.what() % programId);
return 1;
} catch (Error & e) {
printMsg(lvlError, format("error: %1%") % e.msg());
return 1;
} catch (std::exception & e) {
printMsg(lvlError, format("error: %1%") % e.what());
return 1;
}
return 0;
}