336 lines
8.4 KiB
C++
336 lines
8.4 KiB
C++
#include "shared.hh"
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#include "local-store.hh"
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#include "util.hh"
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#include "serialise.hh"
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#include "worker-protocol.hh"
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#include "archive.hh"
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#include "globals.hh"
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#include <iostream>
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#include <unistd.h>
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#include <signal.h>
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#include <fcntl.h>
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using namespace nix;
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static Path readStorePath(Source & from)
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{
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Path path = readString(from);
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assertStorePath(path);
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return path;
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}
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static PathSet readStorePaths(Source & from)
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{
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PathSet paths = readStringSet(from);
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for (PathSet::iterator i = paths.begin(); i != paths.end(); ++i)
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assertStorePath(*i);
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return paths;
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}
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static FdSource from(STDIN_FILENO);
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static FdSink to(STDOUT_FILENO);
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bool canSendStderr;
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/* This function is called anytime we want to write something to
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stderr. If we're in a state where the protocol allows it (i.e.,
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when canSendStderr), send the message to the client over the
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socket. */
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static void tunnelStderr(const unsigned char * buf, size_t count)
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{
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if (canSendStderr)
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writeFull(STDERR_FILENO, (unsigned char *) "L: ", 3);
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writeFull(STDERR_FILENO, buf, count);
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if (canSendStderr) {
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try {
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writeInt(STDERR_NEXT, to);
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writeString(string((char *) buf, count), to);
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} catch (...) {
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/* Write failed; that means that the other side is
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gone. */
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canSendStderr = false;
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throw;
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}
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}
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}
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/* A SIGIO signal is received when data is available on the client
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communication scoket, or when the client has closed its side of the
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socket. This handler is enabled at precisely those moments in the
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protocol when we're doing work and the client is supposed to be
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quiet. Thus, if we get a SIGIO signal, it means that the client
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has quit. So we should quit as well. */
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static void sigioHandler(int sigNo)
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{
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_isInterrupted = 1;
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canSendStderr = false;
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write(STDERR_FILENO, "SIGIO\n", 6);
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}
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/* startWork() means that we're starting an operation for which we
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want to send out stderr to the client. */
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static void startWork()
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{
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canSendStderr = true;
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/* Handle client death asynchronously. */
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if (signal(SIGIO, sigioHandler) == SIG_ERR)
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throw SysError("setting handler for SIGIO");
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/* Of course, there is a race condition here: the socket could
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have closed between when we last read from / wrote to it, and
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between the time we set the handler for SIGIO. In that case we
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won't get the signal. So do a non-blocking select() to find
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out if any input is available on the socket. If there is, it
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has to be the 0-byte read that indicates that the socket has
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closed. */
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struct timeval timeout;
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timeout.tv_sec = timeout.tv_usec = 0;
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fd_set fds;
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FD_ZERO(&fds);
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FD_SET(STDIN_FILENO, &fds);
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if (select(STDIN_FILENO + 1, &fds, 0, 0, &timeout) == -1)
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throw SysError("select()");
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if (FD_ISSET(STDIN_FILENO, &fds)) {
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char c;
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if (read(STDIN_FILENO, &c, 1) != 0)
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throw Error("EOF expected (protocol error?)");
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_isInterrupted = 1;
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checkInterrupt();
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}
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}
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/* stopWork() means that we're done; stop sending stderr to the
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client. */
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static void stopWork()
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{
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/* Stop handling async client death; we're going to a state where
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we're either sending or receiving from the client, so we'll be
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notified of client death anyway. */
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if (signal(SIGIO, SIG_IGN) == SIG_ERR)
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throw SysError("ignoring SIGIO");
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canSendStderr = false;
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writeInt(STDERR_LAST, to);
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}
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static void performOp(Source & from, Sink & to, unsigned int op)
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{
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switch (op) {
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#if 0
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case wopQuit: {
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/* Close the database. */
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store.reset((StoreAPI *) 0);
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writeInt(1, to);
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break;
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}
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#endif
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case wopIsValidPath: {
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Path path = readStorePath(from);
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writeInt(store->isValidPath(path), to);
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break;
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}
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case wopHasSubstitutes: {
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Path path = readStorePath(from);
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writeInt(store->hasSubstitutes(path), to);
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break;
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}
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case wopQueryPathHash: {
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Path path = readStorePath(from);
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writeString(printHash(store->queryPathHash(path)), to);
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break;
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}
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case wopQueryReferences:
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case wopQueryReferrers: {
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Path path = readStorePath(from);
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PathSet paths;
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if (op == wopQueryReferences)
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store->queryReferences(path, paths);
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else
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store->queryReferrers(path, paths);
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writeStringSet(paths, to);
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break;
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}
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case wopAddToStore: {
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/* !!! uberquick hack */
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string baseName = readString(from);
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bool fixed = readInt(from) == 1;
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bool recursive = readInt(from) == 1;
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string hashAlgo = readString(from);
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Path tmp = createTempDir();
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Path tmp2 = tmp + "/" + baseName;
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restorePath(tmp2, from);
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writeString(store->addToStore(tmp2, fixed, recursive, hashAlgo), to);
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deletePath(tmp);
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break;
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}
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case wopAddTextToStore: {
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string suffix = readString(from);
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string s = readString(from);
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PathSet refs = readStorePaths(from);
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writeString(store->addTextToStore(suffix, s, refs), to);
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break;
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}
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case wopBuildDerivations: {
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PathSet drvs = readStorePaths(from);
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startWork();
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store->buildDerivations(drvs);
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stopWork();
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writeInt(1, to);
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break;
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}
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case wopEnsurePath: {
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Path path = readStorePath(from);
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store->ensurePath(path);
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writeInt(1, to);
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break;
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}
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case wopAddTempRoot: {
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Path path = readStorePath(from);
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store->addTempRoot(path);
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writeInt(1, to);
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break;
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}
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case wopSyncWithGC: {
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store->syncWithGC();
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writeInt(1, to);
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break;
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}
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default:
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throw Error(format("invalid operation %1%") % op);
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}
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}
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static void processConnection()
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{
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canSendStderr = false;
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writeToStderr = tunnelStderr;
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/* Allow us to receive SIGIO for events on the client socket. */
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signal(SIGIO, SIG_IGN);
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if (fcntl(STDIN_FILENO, F_SETOWN, getpid()) == -1)
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throw SysError("F_SETOWN");
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if (fcntl(STDIN_FILENO, F_SETFL, fcntl(STDIN_FILENO, F_GETFL, 0) | FASYNC) == -1)
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throw SysError("F_SETFL");
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/* Send startup error messages to the client. */
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startWork();
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try {
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/* Prevent users from doing something very dangerous. */
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if (setuidMode && geteuid() == 0 &&
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querySetting("build-users", Strings()).size() == 0)
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throw Error("if you run `nix-worker' setuid root, then you MUST set `build-users'!");
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/* Open the store. */
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store = boost::shared_ptr<StoreAPI>(new LocalStore(true));
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stopWork();
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} catch (Error & e) {
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writeInt(STDERR_ERROR, to);
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writeString(e.msg(), to);
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return;
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}
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/* Exchange the greeting. */
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unsigned int magic = readInt(from);
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if (magic != WORKER_MAGIC_1) throw Error("protocol mismatch");
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writeInt(WORKER_MAGIC_2, to);
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debug("greeting exchanged");
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/* Process client requests. */
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bool quit = false;
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unsigned int opCount = 0;
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do {
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WorkerOp op = (WorkerOp) readInt(from);
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opCount++;
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try {
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performOp(from, to, op);
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} catch (Error & e) {
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writeInt(STDERR_ERROR, to);
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writeString(e.msg(), to);
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}
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} while (!quit);
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printMsg(lvlError, format("%1% worker operations") % opCount);
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}
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void run(Strings args)
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{
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bool slave = false;
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bool daemon = false;
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for (Strings::iterator i = args.begin(); i != args.end(); ) {
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string arg = *i++;
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if (arg == "--slave") slave = true;
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if (arg == "--daemon") daemon = true;
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}
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if (slave) {
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/* This prevents us from receiving signals from the terminal
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when we're running in setuid mode. */
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if (setsid() == -1)
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throw SysError(format("creating a new session"));
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processConnection();
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}
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else if (daemon) {
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if (setuidMode)
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throw Error("daemon cannot be started in setuid mode");
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throw Error("daemon mode not implemented");
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}
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else
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throw Error("must be run in either --slave or --daemon mode");
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}
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#include "help.txt.hh"
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void printHelp()
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{
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std::cout << string((char *) helpText, sizeof helpText);
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}
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string programId = "nix-worker";
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