forked from lix-project/lix
e2ef5e07fd
containing functions that operate on the Nix store. One implementation is LocalStore, which operates on the Nix store directly. The next step, to enable secure multi-user Nix, is to create a different implementation RemoteStore that talks to a privileged daemon process that uses LocalStore to perform the actual operations.
262 lines
7.3 KiB
C++
262 lines
7.3 KiB
C++
#include "shared.hh"
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#include "globals.hh"
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#include "gc.hh"
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#include "store-api.hh"
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#include "util.hh"
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#include "config.h"
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#include <iostream>
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#include <cctype>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <aterm2.h>
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namespace nix {
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volatile sig_atomic_t blockInt = 0;
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static void sigintHandler(int signo)
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{
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if (!blockInt) {
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_isInterrupted = 1;
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blockInt = 1;
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}
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}
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Path makeRootName(const Path & gcRoot, int & counter)
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{
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counter++;
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if (counter == 1)
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return gcRoot;
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else
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return (format("%1%-%2%") % gcRoot % counter).str();
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}
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void printGCWarning()
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{
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static bool haveWarned = false;
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warnOnce(haveWarned,
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"warning: you did not specify `--add-root'; "
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"the result might be removed by the garbage collector");
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}
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static void setLogType(string lt)
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{
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if (lt == "pretty") logType = ltPretty;
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else if (lt == "escapes") logType = ltEscapes;
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else if (lt == "flat") logType = ltFlat;
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else throw UsageError("unknown log type");
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}
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struct RemoveTempRoots
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{
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~RemoveTempRoots()
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{
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removeTempRoots();
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}
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};
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void initDerivationsHelpers();
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/* Initialize and reorder arguments, then call the actual argument
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processor. */
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static void initAndRun(int argc, char * * argv)
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{
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string root = getEnv("NIX_ROOT");
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if (root != "") {
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if (chroot(root.c_str()) != 0)
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throw SysError(format("changing root to `%1%'") % root);
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}
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/* Setup Nix paths. */
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nixStore = canonPath(getEnv("NIX_STORE_DIR", getEnv("NIX_STORE", NIX_STORE_DIR)));
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nixDataDir = canonPath(getEnv("NIX_DATA_DIR", NIX_DATA_DIR));
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nixLogDir = canonPath(getEnv("NIX_LOG_DIR", NIX_LOG_DIR));
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nixStateDir = canonPath(getEnv("NIX_STATE_DIR", NIX_STATE_DIR));
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nixDBPath = getEnv("NIX_DB_DIR", nixStateDir + "/db");
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nixConfDir = canonPath(getEnv("NIX_CONF_DIR", NIX_CONF_DIR));
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nixLibexecDir = canonPath(getEnv("NIX_LIBEXEC_DIR", NIX_LIBEXEC_DIR));
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/* Get some settings from the configuration file. */
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thisSystem = querySetting("system", SYSTEM);
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{
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int n;
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if (!string2Int(querySetting("build-max-jobs", "1"), n) || n < 0)
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throw Error("invalid value for configuration setting `build-max-jobs'");
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maxBuildJobs = n;
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}
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/* Catch SIGINT. */
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struct sigaction act, oact;
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act.sa_handler = sigintHandler;
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sigfillset(&act.sa_mask);
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act.sa_flags = 0;
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if (sigaction(SIGINT, &act, &oact))
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throw SysError("installing handler for SIGINT");
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if (sigaction(SIGTERM, &act, &oact))
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throw SysError("installing handler for SIGTERM");
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if (sigaction(SIGHUP, &act, &oact))
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throw SysError("installing handler for SIGHUP");
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/* Ignore SIGPIPE. */
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act.sa_handler = SIG_IGN;
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act.sa_flags = 0;
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if (sigaction(SIGPIPE, &act, &oact))
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throw SysError("ignoring SIGPIPE");
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/* There is no privacy in the Nix system ;-) At least not for
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now. In particular, store objects should be readable by
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everybody. This prevents nasty surprises when using a shared
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store (with the setuid() hack). */
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umask(0022);
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/* Process the NIX_LOG_TYPE environment variable. */
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string lt = getEnv("NIX_LOG_TYPE");
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if (lt != "") setLogType(lt);
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/* ATerm stuff. !!! find a better place to put this */
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initDerivationsHelpers();
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/* Put the arguments in a vector. */
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Strings args, remaining;
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while (argc--) args.push_back(*argv++);
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args.erase(args.begin());
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/* Expand compound dash options (i.e., `-qlf' -> `-q -l -f'), and
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ignore options for the ATerm library. */
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for (Strings::iterator i = args.begin(); i != args.end(); ++i) {
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string arg = *i;
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if (string(arg, 0, 4) == "-at-") ;
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else if (arg.length() > 2 && arg[0] == '-' && arg[1] != '-') {
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for (unsigned int j = 1; j < arg.length(); j++)
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if (isalpha(arg[j]))
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remaining.push_back((string) "-" + arg[j]);
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else {
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remaining.push_back(string(arg, j));
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break;
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}
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} else remaining.push_back(arg);
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}
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args = remaining;
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remaining.clear();
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/* Process default options. */
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for (Strings::iterator i = args.begin(); i != args.end(); ++i) {
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string arg = *i;
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if (arg == "--verbose" || arg == "-v")
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verbosity = (Verbosity) ((int) verbosity + 1);
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else if (arg == "--log-type") {
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++i;
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if (i == args.end()) throw UsageError("`--log-type' requires an argument");
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setLogType(*i);
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}
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else if (arg == "--build-output" || arg == "-B")
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; /* !!! obsolete - remove eventually */
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else if (arg == "--no-build-output" || arg == "-Q")
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buildVerbosity = lvlVomit;
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else if (arg == "--help") {
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printHelp();
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return;
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}
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else if (arg == "--version") {
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std::cout << format("%1% (Nix) %2%") % programId % NIX_VERSION << std::endl;
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return;
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}
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else if (arg == "--keep-failed" || arg == "-K")
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keepFailed = true;
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else if (arg == "--keep-going" || arg == "-k")
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keepGoing = true;
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else if (arg == "--fallback")
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tryFallback = true;
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else if (arg == "--max-jobs" || arg == "-j") {
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++i;
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if (i == args.end()) throw UsageError("`--max-jobs' requires an argument");
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int n;
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if (!string2Int(*i, n) || n < 0)
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throw UsageError(format("`--max-jobs' requires a non-negative integer"));
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maxBuildJobs = n;
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}
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else if (arg == "--readonly-mode")
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readOnlyMode = true;
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else remaining.push_back(arg);
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}
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/* Automatically clean up the temporary roots file when we
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exit. */
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RemoveTempRoots removeTempRoots; /* unused variable - don't remove */
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run(remaining);
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/* Close the Nix database. */
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store.reset((StoreAPI *) 0);
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}
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}
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static char buf[1024];
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int main(int argc, char * * argv)
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{
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using namespace nix;
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/* If we are setuid root, we have to get rid of the excess
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privileges ASAP. */
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switchToNixUser();
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/* ATerm setup. */
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ATerm bottomOfStack;
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ATinit(argc, argv, &bottomOfStack);
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/* Turn on buffering for cerr. */
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#if HAVE_PUBSETBUF
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std::cerr.rdbuf()->pubsetbuf(buf, sizeof(buf));
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#endif
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std::ios::sync_with_stdio(false);
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try {
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try {
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initAndRun(argc, argv);
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} catch (...) {
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/* Subtle: we have to make sure that any `interrupted'
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condition is discharged before we reach printMsg()
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below, since otherwise it will throw an (uncaught)
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exception. */
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blockInt = 1; /* ignore further SIGINTs */
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_isInterrupted = 0;
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throw;
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}
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} catch (UsageError & e) {
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printMsg(lvlError,
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format(
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"error: %1%\n"
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"Try `%2% --help' for more information.")
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% e.what() % programId);
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return 1;
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} catch (Error & e) {
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printMsg(lvlError, format("error: %1%") % e.msg());
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return 1;
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} catch (std::exception & e) {
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printMsg(lvlError, format("error: %1%") % e.what());
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return 1;
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}
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return 0;
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}
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