forked from lix-project/lix
311 lines
9 KiB
C++
311 lines
9 KiB
C++
#include "shared.hh"
|
|
#include "globals.hh"
|
|
#include "store-api.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,
|
|
"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");
|
|
}
|
|
|
|
|
|
static unsigned int getIntArg(const string & opt,
|
|
Strings::iterator & i, const Strings::iterator & end)
|
|
{
|
|
++i;
|
|
if (i == end) throw UsageError(format("`%1%' requires an argument") % opt);
|
|
int n;
|
|
if (!string2Int(*i, n) || n < 0)
|
|
throw UsageError(format("`%1%' requires a non-negative integer") % opt);
|
|
return n;
|
|
}
|
|
|
|
|
|
struct RemoveTempRoots
|
|
{
|
|
~RemoveTempRoots()
|
|
{
|
|
removeTempRoots();
|
|
}
|
|
};
|
|
|
|
|
|
void initDerivationsHelpers();
|
|
|
|
|
|
/* Initialize and reorder arguments, then call the actual argument
|
|
processor. */
|
|
static void initAndRun(int argc, char * * argv)
|
|
{
|
|
/* 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));
|
|
|
|
/* Get some settings from the configuration file. */
|
|
thisSystem = querySetting("system", SYSTEM);
|
|
maxBuildJobs = queryIntSetting("build-max-jobs", 1);
|
|
maxSilentTime = queryIntSetting("build-max-silent-time", 0);
|
|
|
|
/* 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")
|
|
maxBuildJobs = getIntArg(arg, i, args.end());
|
|
else if (arg == "--readonly-mode")
|
|
readOnlyMode = true;
|
|
else if (arg == "--max-silent-time")
|
|
maxSilentTime = getIntArg(arg, i, args.end());
|
|
else remaining.push_back(arg);
|
|
}
|
|
|
|
/* Automatically clean up the temporary roots file when we
|
|
exit. */
|
|
RemoveTempRoots removeTempRoots; /* unused variable - don't remove */
|
|
|
|
run(remaining);
|
|
|
|
/* Close the Nix database. */
|
|
store.reset((StoreAPI *) 0);
|
|
}
|
|
|
|
|
|
bool setuidMode = false;
|
|
|
|
|
|
static void setuidInit()
|
|
{
|
|
/* Don't do anything if this is not a setuid binary. */
|
|
if (getuid() == geteuid() && getgid() == getegid()) return;
|
|
|
|
uid_t nixUid = geteuid();
|
|
gid_t nixGid = getegid();
|
|
|
|
setuidCleanup();
|
|
|
|
/* Don't trust the current directory. */
|
|
if (chdir("/") == -1) abort();
|
|
|
|
/* Set the real (and preferably also the save) uid/gid to the
|
|
effective uid/gid. This matters mostly when we're not using
|
|
build-users (bad!), since some builders (like Perl) complain
|
|
when real != effective.
|
|
|
|
On systems where setresuid is unavailable, we can't drop the
|
|
saved uid/gid. This means that we could go back to the
|
|
original real uid (i.e., the uid of the caller). That's not
|
|
really a problem, except maybe when we execute a builder and
|
|
we're not using build-users. In that case, the builder may be
|
|
able to switch to the uid of the caller and possibly do bad
|
|
stuff. But note that when not using build-users, the builder
|
|
could also modify the Nix executables (say, replace them by a
|
|
Trojan horse), so the problem is already there. */
|
|
|
|
#if HAVE_SETRESUID
|
|
if (setresuid(nixUid, nixUid, nixUid)) abort();
|
|
if (setresgid(nixGid, nixGid, nixGid)) abort();
|
|
#elif HAVE_SETREUID
|
|
/* Note: doesn't set saved uid/gid! */
|
|
fprintf(stderr, "warning: cannot set saved uid\n");
|
|
if (setreuid(nixUid, nixUid)) abort();
|
|
if (setregid(nixGid, nixGid)) abort();
|
|
#else
|
|
/* Note: doesn't set real and saved uid/gid! */
|
|
fprintf(stderr, "warning: cannot set real and saved uids\n");
|
|
if (setuid(nixUid)) abort();
|
|
if (setgid(nixGid)) abort();
|
|
#endif
|
|
|
|
setuidMode = true;
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
static char buf[1024];
|
|
|
|
int main(int argc, char * * argv)
|
|
{
|
|
using namespace nix;
|
|
|
|
/* If we're setuid, then we need to take some security precautions
|
|
right away. */
|
|
if (argc == 0) abort();
|
|
setuidInit();
|
|
|
|
/* ATerm setup. */
|
|
ATerm bottomOfStack;
|
|
ATinit(argc, argv, &bottomOfStack);
|
|
|
|
/* Turn on buffering for cerr. */
|
|
#if HAVE_PUBSETBUF
|
|
std::cerr.rdbuf()->pubsetbuf(buf, sizeof(buf));
|
|
#endif
|
|
|
|
std::ios::sync_with_stdio(false);
|
|
|
|
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;
|
|
}
|
|
|
|
|