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-rw-r--r--src/libexpr/eval.cc21
-rw-r--r--src/libexpr/eval.hh8
-rw-r--r--src/libexpr/primops.cc35
-rw-r--r--src/libmain/shared.cc59
-rw-r--r--src/libmain/stack.cc2
-rw-r--r--src/libstore/build.cc64
-rw-r--r--src/libstore/gc.cc4
-rw-r--r--src/libstore/local-store.cc5
-rw-r--r--src/libstore/pathlocks.cc2
-rw-r--r--src/libstore/remote-store.cc2
-rw-r--r--src/libutil/types.hh1
-rw-r--r--src/libutil/util.cc92
-rw-r--r--src/libutil/util.hh18
-rw-r--r--src/nix-daemon/nix-daemon.cc37
-rw-r--r--src/nix-instantiate/nix-instantiate.cc2
-rw-r--r--src/nix-store/nix-store.cc2
16 files changed, 152 insertions, 202 deletions
diff --git a/src/libexpr/eval.cc b/src/libexpr/eval.cc
index 2ff9756108ad..298f6a3a60e3 100644
--- a/src/libexpr/eval.cc
+++ b/src/libexpr/eval.cc
@@ -247,7 +247,6 @@ EvalState::EvalState(const Strings & _searchPath)
 EvalState::~EvalState()
 {
     fileEvalCache.clear();
-    printCanaries();
 }
 
 
@@ -1514,26 +1513,6 @@ void EvalState::printStats()
 }
 
 
-void EvalState::printCanaries()
-{
-#if HAVE_BOEHMGC
-    if (!settings.get("debug-gc", false)) return;
-
-    GC_gcollect();
-
-    if (gcCanaries.empty()) {
-        printMsg(lvlError, "all canaries have been garbage-collected");
-        return;
-    }
-
-    printMsg(lvlError, "the following canaries have not been garbage-collected:");
-
-    for (auto i : gcCanaries)
-        printMsg(lvlError, format("  %1%") % i->string.s);
-#endif
-}
-
-
 size_t valueSize(Value & v)
 {
     std::set<const void *> seen;
diff --git a/src/libexpr/eval.hh b/src/libexpr/eval.hh
index 8bf65c2c55de..78942927fd24 100644
--- a/src/libexpr/eval.hh
+++ b/src/libexpr/eval.hh
@@ -287,8 +287,6 @@ public:
     /* Print statistics. */
     void printStats();
 
-    void printCanaries();
-
 private:
 
     unsigned long nrEnvs;
@@ -320,12 +318,6 @@ private:
     friend struct ExprOpConcatLists;
     friend struct ExprSelect;
     friend void prim_getAttr(EvalState & state, const Pos & pos, Value * * args, Value & v);
-
-#if HAVE_BOEHMGC
-    std::set<Value *> gcCanaries;
-    friend void canaryFinalizer(GC_PTR obj, GC_PTR client_data);
-    friend void prim_gcCanary(EvalState & state, const Pos & pos, Value * * args, Value & v);
-#endif
 };
 
 
diff --git a/src/libexpr/primops.cc b/src/libexpr/primops.cc
index e7b79604699b..cd7b287e29c3 100644
--- a/src/libexpr/primops.cc
+++ b/src/libexpr/primops.cc
@@ -417,32 +417,6 @@ static void prim_trace(EvalState & state, const Pos & pos, Value * * args, Value
 }
 
 
-#if HAVE_BOEHMGC
-void canaryFinalizer(GC_PTR obj, GC_PTR client_data)
-{
-    Value * v = (Value *) obj;
-    EvalState & state(* (EvalState *) client_data);
-    printMsg(lvlError, format("canary ‘%1%’ garbage-collected") % v->string.s);
-    auto i = state.gcCanaries.find(v);
-    assert(i != state.gcCanaries.end());
-    state.gcCanaries.erase(i);
-}
-#endif
-
-
-void prim_gcCanary(EvalState & state, const Pos & pos, Value * * args, Value & v)
-{
-    string s = state.forceStringNoCtx(*args[0], pos);
-    state.mkList(v, 1);
-    Value * canary = v.list.elems[0] = state.allocValue();
-#if HAVE_BOEHMGC
-    state.gcCanaries.insert(canary);
-    GC_register_finalizer(canary, canaryFinalizer, &state, 0, 0);
-#endif
-    mkString(*canary, s);
-}
-
-
 void prim_valueSize(EvalState & state, const Pos & pos, Value * * args, Value & v)
 {
     /* We're not forcing the argument on purpose. */
@@ -756,8 +730,12 @@ static void prim_readFile(EvalState & state, const Pos & pos, Value * * args, Va
 {
     PathSet context;
     Path path = state.coerceToPath(pos, *args[0], context);
-    if (!context.empty())
-        throw EvalError(format("string ‘%1%’ cannot refer to other paths, at %2%") % path % pos);
+    try {
+        realiseContext(context);
+    } catch (InvalidPathError & e) {
+        throw EvalError(format("cannot read ‘%1%’, since path ‘%2%’ is not valid, at %3%")
+            % path % e.path % pos);
+    }
     mkString(v, readFile(path).c_str());
 }
 
@@ -1556,7 +1534,6 @@ void EvalState::createBaseEnv()
 
     // Debugging
     addPrimOp("__trace", 2, prim_trace);
-    addPrimOp("__gcCanary", 1, prim_gcCanary);
     addPrimOp("__valueSize", 1, prim_valueSize);
 
     // Paths
diff --git a/src/libmain/shared.cc b/src/libmain/shared.cc
index bf5688a1e606..9c74a614e2e4 100644
--- a/src/libmain/shared.cc
+++ b/src/libmain/shared.cc
@@ -16,7 +16,6 @@
 #include <sys/stat.h>
 #include <unistd.h>
 #include <signal.h>
-#include <spawn.h>
 
 extern char * * environ;
 
@@ -293,8 +292,9 @@ int handleExceptions(const string & programName, std::function<void()> fun)
 
 RunPager::RunPager()
 {
-    string pager = getEnv("PAGER");
-    if (!isatty(STDOUT_FILENO) || pager.empty()) return;
+    if (!isatty(STDOUT_FILENO)) return;
+    string pager = getEnv("PAGER", "default");
+    if (pager == "" || pager == "cat") return;
 
     /* Ignore SIGINT. The pager will handle it (and we'll get
        SIGPIPE). */
@@ -309,35 +309,18 @@ RunPager::RunPager()
     Pipe toPager;
     toPager.create();
 
-    // FIXME: should do this in the child environment.
-    if (!getenv("LESS"))
-        setenv("LESS", "FRSXMK", 1);
-
-    /* Start the pager using posix_spawn. */
-    pid_t pid_;
-    const char * argv[] = { "sh", "-c", pager.c_str(), 0 };
-
-    posix_spawn_file_actions_t fileActions;
-    int err = posix_spawn_file_actions_init(&fileActions);
-    if (err) throw SysError(err, "creating POSIX file actions");
-    err = posix_spawn_file_actions_adddup2(&fileActions, toPager.readSide, STDIN_FILENO);
-    if (err) throw SysError(err, "adding to POSIX file actions");
-
-    posix_spawnattr_t spawnAttrs;
-    err = posix_spawnattr_init(&spawnAttrs);
-    if (err) throw SysError(err, "creating POSIX spawn attrs");
-#ifdef POSIX_SPAWN_USEVFORK
-    err = posix_spawnattr_setflags(&spawnAttrs, POSIX_SPAWN_USEVFORK);
-    if (err) throw SysError(err, "setting POSIX spawn attr flag");
-#endif
-
-    err = posix_spawn(&pid_, "/bin/sh", &fileActions, &spawnAttrs, (char * const *) argv, environ);
-
-    posix_spawn_file_actions_destroy(&fileActions);
-    posix_spawnattr_destroy(&spawnAttrs);
-
-    if (err) throw SysError(err, format("running ‘%1%’") % pager);
-    pid = pid_;
+    pid = startProcess([&]() {
+        if (dup2(toPager.readSide, STDIN_FILENO) == -1)
+            throw SysError("dupping stdin");
+        if (!getenv("LESS"))
+            setenv("LESS", "FRSXMK", 1);
+        if (pager != "default")
+            execl("/bin/sh", "sh", "-c", pager.c_str(), NULL);
+        execlp("pager", "pager", NULL);
+        execlp("less", "less", NULL);
+        execlp("more", "more", NULL);
+        throw SysError(format("executing ‘%1%’") % pager);
+    });
 
     if (dup2(toPager.writeSide, STDOUT_FILENO) == -1)
         throw SysError("dupping stdout");
@@ -346,10 +329,14 @@ RunPager::RunPager()
 
 RunPager::~RunPager()
 {
-    if (pid != -1) {
-        std::cout.flush();
-        close(STDOUT_FILENO);
-        pid.wait(true);
+    try {
+        if (pid != -1) {
+            std::cout.flush();
+            close(STDOUT_FILENO);
+            pid.wait(true);
+        }
+    } catch (...) {
+        ignoreException();
     }
 }
 
diff --git a/src/libmain/stack.cc b/src/libmain/stack.cc
index b670e695d140..41b617d98be2 100644
--- a/src/libmain/stack.cc
+++ b/src/libmain/stack.cc
@@ -32,7 +32,7 @@ static void sigsegvHandler(int signo, siginfo_t * info, void * ctx)
         if (diff < 0) diff = -diff;
         if (diff < 4096) {
             char msg[] = "error: stack overflow (possible infinite recursion)\n";
-            write(2, msg, strlen(msg));
+            (void) write(2, msg, strlen(msg));
             _exit(1); // maybe abort instead?
         }
     }
diff --git a/src/libstore/build.cc b/src/libstore/build.cc
index 539d0b21b278..08f44b392b00 100644
--- a/src/libstore/build.cc
+++ b/src/libstore/build.cc
@@ -415,18 +415,6 @@ static void commonChildInit(Pipe & logPipe)
 }
 
 
-/* Convert a string list to an array of char pointers.  Careful: the
-   string list should outlive the array. */
-const char * * strings2CharPtrs(const Strings & ss)
-{
-    const char * * arr = new const char * [ss.size() + 1];
-    const char * * p = arr;
-    foreach (Strings::const_iterator, i, ss) *p++ = i->c_str();
-    *p = 0;
-    return arr;
-}
-
-
 //////////////////////////////////////////////////////////////////////
 
 
@@ -816,8 +804,8 @@ private:
     /* Start building a derivation. */
     void startBuilder();
 
-    /* Initialise the builder's process. */
-    void initChild();
+    /* Run the builder's process. */
+    void runChild();
 
     friend int childEntry(void *);
 
@@ -1914,9 +1902,11 @@ void DerivationGoal::startBuilder()
     builderOut.create();
 
     /* Fork a child to build the package. */
+    ProcessOptions options;
+    options.allowVfork = !buildUser.enabled();
     pid = startProcess([&]() {
-        initChild();
-    });
+        runChild();
+    }, options);
 
     /* parent */
     pid.setSeparatePG(true);
@@ -1936,7 +1926,7 @@ void DerivationGoal::startBuilder()
 }
 
 
-void DerivationGoal::initChild()
+void DerivationGoal::runChild()
 {
     /* Warning: in the child we should absolutely not make any SQLite
        calls! */
@@ -1986,9 +1976,11 @@ void DerivationGoal::initChild()
 
             /* Set the hostname etc. to fixed values. */
             char hostname[] = "localhost";
-            sethostname(hostname, sizeof(hostname));
+            if (sethostname(hostname, sizeof(hostname)) == -1)
+                throw SysError("cannot set host name");
             char domainname[] = "(none)"; // kernel default
-            setdomainname(domainname, sizeof(domainname));
+            if (setdomainname(domainname, sizeof(domainname)) == -1)
+                throw SysError("cannot set domain name");
 
             /* Make all filesystems private.  This is necessary
                because subtrees may have been mounted as "shared"
@@ -2122,11 +2114,7 @@ void DerivationGoal::initChild()
         Strings envStrs;
         foreach (Environment::const_iterator, i, env)
             envStrs.push_back(rewriteHashes(i->first + "=" + i->second, rewritesToTmp));
-        const char * * envArr = strings2CharPtrs(envStrs);
-
-        Path program = drv.builder.c_str();
-        std::vector<const char *> args; /* careful with c_str()! */
-        string user; /* must be here for its c_str()! */
+        auto envArr = stringsToCharPtrs(envStrs);
 
         /* If we are running in `build-users' mode, then switch to the
            user we allocated above.  Make sure that we drop all root
@@ -2135,8 +2123,6 @@ void DerivationGoal::initChild()
            setuid() when run as root sets the real, effective and
            saved UIDs. */
         if (buildUser.enabled()) {
-            printMsg(lvlChatty, format("switching to user ‘%1%’") % buildUser.getUser());
-
             if (setgroups(0, 0) == -1)
                 throw SysError("cannot clear the set of supplementary groups");
 
@@ -2152,29 +2138,25 @@ void DerivationGoal::initChild()
         }
 
         /* Fill in the arguments. */
+        Strings args;
         string builderBasename = baseNameOf(drv.builder);
-        args.push_back(builderBasename.c_str());
-        foreach (Strings::iterator, i, drv.args) {
-            auto re = rewriteHashes(*i, rewritesToTmp);
-            auto cstr = new char[re.length()+1];
-            std::strcpy(cstr, re.c_str());
-
-            args.push_back(cstr);
-        }
-        args.push_back(0);
+        args.push_back(builderBasename);
+        foreach (Strings::iterator, i, drv.args)
+            args.push_back(rewriteHashes(*i, rewritesToTmp));
+        auto argArr = stringsToCharPtrs(args);
 
         restoreSIGPIPE();
 
         /* Indicate that we managed to set up the build environment. */
-        writeToStderr("\n");
+        writeFull(STDERR_FILENO, "\n");
 
         /* Execute the program.  This should not return. */
-        execve(program.c_str(), (char * *) &args[0], (char * *) envArr);
+        execve(drv.builder.c_str(), (char * *) &argArr[0], (char * *) &envArr[0]);
 
         throw SysError(format("executing ‘%1%’") % drv.builder);
 
     } catch (std::exception & e) {
-        writeToStderr("while setting up the build environment: " + string(e.what()) + "\n");
+        writeFull(STDERR_FILENO, "while setting up the build environment: " + string(e.what()) + "\n");
         _exit(1);
     }
 }
@@ -2487,7 +2469,7 @@ void DerivationGoal::handleChildOutput(int fd, const string & data)
             BZ2_bzWrite(&err, bzLogFile, (unsigned char *) data.data(), data.size());
             if (err != BZ_OK) throw Error(format("cannot write to compressed log file (BZip2 error = %1%)") % err);
         } else if (fdLogFile != -1)
-            writeFull(fdLogFile, (unsigned char *) data.data(), data.size());
+            writeFull(fdLogFile, data);
     }
 
     if (hook && fd == hook->fromHook.readSide)
@@ -2797,7 +2779,7 @@ void SubstitutionGoal::tryToRun()
     args.push_back("--substitute");
     args.push_back(storePath);
     args.push_back(destPath);
-    const char * * argArr = strings2CharPtrs(args);
+    auto argArr = stringsToCharPtrs(args);
 
     /* Fork the substitute program. */
     pid = startProcess([&]() {
@@ -2807,7 +2789,7 @@ void SubstitutionGoal::tryToRun()
         if (dup2(outPipe.writeSide, STDOUT_FILENO) == -1)
             throw SysError("cannot dup output pipe into stdout");
 
-        execv(sub.c_str(), (char * *) argArr);
+        execv(sub.c_str(), (char * *) &argArr[0]);
 
         throw SysError(format("executing ‘%1%’") % sub);
     });
diff --git a/src/libstore/gc.cc b/src/libstore/gc.cc
index 49cb11d23290..7959a592d987 100644
--- a/src/libstore/gc.cc
+++ b/src/libstore/gc.cc
@@ -191,7 +191,7 @@ void LocalStore::addTempRoot(const Path & path)
     lockFile(fdTempRoots, ltWrite, true);
 
     string s = path + '\0';
-    writeFull(fdTempRoots, (const unsigned char *) s.data(), s.size());
+    writeFull(fdTempRoots, s);
 
     /* Downgrade to a read lock. */
     debug(format("downgrading to read lock on ‘%1%’") % fnTempRoots);
@@ -231,7 +231,7 @@ static void readTempRoots(PathSet & tempRoots, FDs & fds)
         if (lockFile(*fd, ltWrite, false)) {
             printMsg(lvlError, format("removing stale temporary roots file ‘%1%’") % path);
             unlink(path.c_str());
-            writeFull(*fd, (const unsigned char *) "d", 1);
+            writeFull(*fd, "d");
             continue;
         }
 
diff --git a/src/libstore/local-store.cc b/src/libstore/local-store.cc
index fc48c0405650..3ad80bc4e6f4 100644
--- a/src/libstore/local-store.cc
+++ b/src/libstore/local-store.cc
@@ -358,7 +358,8 @@ LocalStore::~LocalStore()
             i->second.to.close();
             i->second.from.close();
             i->second.error.close();
-            i->second.pid.wait(true);
+            if (i->second.pid != -1)
+                i->second.pid.wait(true);
         }
     } catch (...) {
         ignoreException();
@@ -498,7 +499,7 @@ void LocalStore::makeStoreWritable()
         if (unshare(CLONE_NEWNS) == -1)
             throw SysError("setting up a private mount namespace");
 
-        if (mount(0, settings.nixStore.c_str(), 0, MS_REMOUNT | MS_BIND, 0) == -1)
+        if (mount(0, settings.nixStore.c_str(), "none", MS_REMOUNT | MS_BIND, 0) == -1)
             throw SysError(format("remounting %1% writable") % settings.nixStore);
     }
 #endif
diff --git a/src/libstore/pathlocks.cc b/src/libstore/pathlocks.cc
index f26684afacb9..9db37e8f9aaa 100644
--- a/src/libstore/pathlocks.cc
+++ b/src/libstore/pathlocks.cc
@@ -33,7 +33,7 @@ void deleteLockFile(const Path & path, int fd)
        other processes waiting on this lock that the lock is stale
        (deleted). */
     unlink(path.c_str());
-    writeFull(fd, (const unsigned char *) "d", 1);
+    writeFull(fd, "d");
     /* Note that the result of unlink() is ignored; removing the lock
        file is an optimisation, not a necessity. */
 }
diff --git a/src/libstore/remote-store.cc b/src/libstore/remote-store.cc
index cabde051bd02..d08913246321 100644
--- a/src/libstore/remote-store.cc
+++ b/src/libstore/remote-store.cc
@@ -110,7 +110,7 @@ void RemoteStore::connectToDaemon()
        applications... */
     AutoCloseFD fdPrevDir = open(".", O_RDONLY);
     if (fdPrevDir == -1) throw SysError("couldn't open current directory");
-    chdir(dirOf(socketPath).c_str());
+    if (chdir(dirOf(socketPath).c_str()) == -1) throw SysError(format("couldn't change to directory of ‘%1%’") % socketPath);
     Path socketPathRel = "./" + baseNameOf(socketPath);
 
     struct sockaddr_un addr;
diff --git a/src/libutil/types.hh b/src/libutil/types.hh
index 030996a060e2..160884ee1ad7 100644
--- a/src/libutil/types.hh
+++ b/src/libutil/types.hh
@@ -73,7 +73,6 @@ class SysError : public Error
 public:
     int errNo;
     SysError(const FormatOrString & fs);
-    SysError(int errNo, const FormatOrString & fs);
 };
 
 
diff --git a/src/libutil/util.cc b/src/libutil/util.cc
index 60be02cd4647..dcdb438e03b2 100644
--- a/src/libutil/util.cc
+++ b/src/libutil/util.cc
@@ -45,14 +45,8 @@ BaseError & BaseError::addPrefix(const FormatOrString & fs)
 
 
 SysError::SysError(const FormatOrString & fs)
-    : SysError(errno, fs)
-{
-}
-
-
-SysError::SysError(int errNo, const FormatOrString & fs)
-    : Error(format("%1%: %2%") % fs.s % strerror(errNo))
-    , errNo(errNo)
+    : Error(format("%1%: %2%") % fs.s % strerror(errno))
+    , errNo(errno)
 {
 }
 
@@ -271,7 +265,7 @@ void writeFile(const Path & path, const string & s)
     AutoCloseFD fd = open(path.c_str(), O_WRONLY | O_TRUNC | O_CREAT, 0666);
     if (fd == -1)
         throw SysError(format("opening file ‘%1%’") % path);
-    writeFull(fd, (unsigned char *) s.data(), s.size());
+    writeFull(fd, s);
 }
 
 
@@ -298,7 +292,7 @@ string readLine(int fd)
 void writeLine(int fd, string s)
 {
     s += '\n';
-    writeFull(fd, (const unsigned char *) s.data(), s.size());
+    writeFull(fd, s);
 }
 
 
@@ -489,18 +483,13 @@ void warnOnce(bool & haveWarned, const FormatOrString & fs)
 }
 
 
-static void defaultWriteToStderr(const unsigned char * buf, size_t count)
-{
-    writeFull(STDERR_FILENO, buf, count);
-}
-
-
 void writeToStderr(const string & s)
 {
     try {
-        auto p = _writeToStderr;
-        if (!p) p = defaultWriteToStderr;
-        p((const unsigned char *) s.data(), s.size());
+        if (_writeToStderr)
+            _writeToStderr((const unsigned char *) s.data(), s.size());
+        else
+            writeFull(STDERR_FILENO, s);
     } catch (SysError & e) {
         /* Ignore failing writes to stderr if we're in an exception
            handler, otherwise throw an exception.  We need to ignore
@@ -512,7 +501,7 @@ void writeToStderr(const string & s)
 }
 
 
-void (*_writeToStderr) (const unsigned char * buf, size_t count) = defaultWriteToStderr;
+void (*_writeToStderr) (const unsigned char * buf, size_t count) = 0;
 
 
 void readFull(int fd, unsigned char * buf, size_t count)
@@ -546,6 +535,12 @@ void writeFull(int fd, const unsigned char * buf, size_t count)
 }
 
 
+void writeFull(int fd, const string & s)
+{
+    writeFull(fd, (const unsigned char *) s.data(), s.size());
+}
+
+
 string drainFD(int fd)
 {
     string result;
@@ -831,6 +826,9 @@ void killUser(uid_t uid)
        users to which the current process can send signals.  So we
        fork a process, switch to uid, and send a mass kill. */
 
+    ProcessOptions options;
+    options.allowVfork = false;
+
     Pid pid = startProcess([&]() {
 
         if (setuid(uid) == -1)
@@ -853,7 +851,7 @@ void killUser(uid_t uid)
         }
 
         _exit(0);
-    });
+    }, options);
 
     int status = pid.wait(true);
     if (status != 0)
@@ -869,46 +867,64 @@ void killUser(uid_t uid)
 //////////////////////////////////////////////////////////////////////
 
 
-pid_t startProcess(std::function<void()> fun,
-    bool dieWithParent, const string & errorPrefix, bool runExitHandlers)
+/* Wrapper around vfork to prevent the child process from clobbering
+   the caller's stack frame in the parent. */
+static pid_t doFork(bool allowVfork, std::function<void()> fun) __attribute__((noinline));
+static pid_t doFork(bool allowVfork, std::function<void()> fun)
 {
+#ifdef __linux__
+    pid_t pid = allowVfork ? vfork() : fork();
+#else
     pid_t pid = fork();
-    if (pid == -1) throw SysError("unable to fork");
+#endif
+    if (pid != 0) return pid;
+    fun();
+    abort();
+}
 
-    if (pid == 0) {
-        _writeToStderr = 0;
+
+pid_t startProcess(std::function<void()> fun, const ProcessOptions & options)
+{
+    auto wrapper = [&]() {
+        if (!options.allowVfork) _writeToStderr = 0;
         try {
 #if __linux__
-            if (dieWithParent && prctl(PR_SET_PDEATHSIG, SIGKILL) == -1)
+            if (options.dieWithParent && prctl(PR_SET_PDEATHSIG, SIGKILL) == -1)
                 throw SysError("setting death signal");
 #endif
             restoreAffinity();
             fun();
         } catch (std::exception & e) {
             try {
-                std::cerr << errorPrefix << e.what() << "\n";
+                std::cerr << options.errorPrefix << e.what() << "\n";
             } catch (...) { }
         } catch (...) { }
-        if (runExitHandlers)
+        if (options.runExitHandlers)
             exit(1);
         else
             _exit(1);
-    }
+    };
+
+    pid_t pid = doFork(options.allowVfork, wrapper);
+    if (pid == -1) throw SysError("unable to fork");
 
     return pid;
 }
 
 
+std::vector<const char *> stringsToCharPtrs(const Strings & ss)
+{
+    std::vector<const char *> res;
+    for (auto & s : ss) res.push_back(s.c_str());
+    res.push_back(0);
+    return res;
+}
+
+
 string runProgram(Path program, bool searchPath, const Strings & args)
 {
     checkInterrupt();
 
-    std::vector<const char *> cargs; /* careful with c_str()! */
-    cargs.push_back(program.c_str());
-    for (Strings::const_iterator i = args.begin(); i != args.end(); ++i)
-        cargs.push_back(i->c_str());
-    cargs.push_back(0);
-
     /* Create a pipe. */
     Pipe pipe;
     pipe.create();
@@ -918,6 +934,10 @@ string runProgram(Path program, bool searchPath, const Strings & args)
         if (dup2(pipe.writeSide, STDOUT_FILENO) == -1)
             throw SysError("dupping stdout");
 
+        Strings args_(args);
+        args_.push_front(program);
+        auto cargs = stringsToCharPtrs(args_);
+
         if (searchPath)
             execvp(program.c_str(), (char * *) &cargs[0]);
         else
diff --git a/src/libutil/util.hh b/src/libutil/util.hh
index 628b8a0e1f09..186ee71f45d0 100644
--- a/src/libutil/util.hh
+++ b/src/libutil/util.hh
@@ -171,6 +171,7 @@ extern void (*_writeToStderr) (const unsigned char * buf, size_t count);
    requested number of bytes. */
 void readFull(int fd, unsigned char * buf, size_t count);
 void writeFull(int fd, const unsigned char * buf, size_t count);
+void writeFull(int fd, const string & s);
 
 MakeError(EndOfFile, Error)
 
@@ -269,8 +270,16 @@ void killUser(uid_t uid);
 
 /* Fork a process that runs the given function, and return the child
    pid to the caller. */
-pid_t startProcess(std::function<void()> fun, bool dieWithParent = true,
-    const string & errorPrefix = "error: ", bool runExitHandlers = false);
+struct ProcessOptions
+{
+    string errorPrefix;
+    bool dieWithParent;
+    bool runExitHandlers;
+    bool allowVfork;
+    ProcessOptions() : errorPrefix("error: "), dieWithParent(true), runExitHandlers(false), allowVfork(true) { };
+};
+
+pid_t startProcess(std::function<void()> fun, const ProcessOptions & options = ProcessOptions());
 
 
 /* Run a program and return its stdout in a string (i.e., like the
@@ -280,6 +289,11 @@ string runProgram(Path program, bool searchPath = false,
 
 MakeError(ExecError, Error)
 
+/* Convert a list of strings to a null-terminated vector of char
+   *'s. The result must not be accessed beyond the lifetime of the
+   list of strings. */
+std::vector<const char *> stringsToCharPtrs(const Strings & ss);
+
 /* Close all file descriptors except stdin, stdout, stderr, and those
    listed in the given set.  Good practice in child processes. */
 void closeMostFDs(const set<int> & exceptions);
diff --git a/src/nix-daemon/nix-daemon.cc b/src/nix-daemon/nix-daemon.cc
index 3864ab935de0..bed7de0859a3 100644
--- a/src/nix-daemon/nix-daemon.cc
+++ b/src/nix-daemon/nix-daemon.cc
@@ -513,11 +513,11 @@ static void performOp(bool trusted, unsigned int clientVersion,
     }
 
     case wopOptimiseStore:
-	startWork();
-	store->optimiseStore();
-	stopWork();
-	writeInt(1, to);
-	break;
+        startWork();
+        store->optimiseStore();
+        stopWork();
+        writeInt(1, to);
+        break;
 
     default:
         throw Error(format("invalid operation %1%") % op);
@@ -610,6 +610,8 @@ static void processConnection(bool trusted)
         assert(!canSendStderr);
     };
 
+    canSendStderr = false;
+    _isInterrupted = false;
     printMsg(lvlDebug, format("%1% operations") % opCount);
 }
 
@@ -696,7 +698,8 @@ static PeerInfo getPeerInfo(int remote)
 
 static void daemonLoop(char * * argv)
 {
-    chdir("/");
+    if (chdir("/") == -1)
+        throw SysError("cannot change current directory");
 
     /* Get rid of children automatically; don't let them become
        zombies. */
@@ -726,7 +729,8 @@ static void daemonLoop(char * * argv)
         /* Urgh, sockaddr_un allows path names of only 108 characters.
            So chdir to the socket directory so that we can pass a
            relative path name. */
-        chdir(dirOf(socketPath).c_str());
+        if (chdir(dirOf(socketPath).c_str()) == -1)
+            throw SysError("cannot change current directory");
         Path socketPathRel = "./" + baseNameOf(socketPath);
 
         struct sockaddr_un addr;
@@ -746,7 +750,8 @@ static void daemonLoop(char * * argv)
         if (res == -1)
             throw SysError(format("cannot bind to socket ‘%1%’") % socketPath);
 
-        chdir("/"); /* back to the root */
+        if (chdir("/") == -1) /* back to the root */
+            throw SysError("cannot change current directory");
 
         if (listen(fdSocket, 5) == -1)
             throw SysError(format("cannot listen on socket ‘%1%’") % socketPath);
@@ -799,6 +804,11 @@ static void daemonLoop(char * * argv)
                 % (peer.uidKnown ? user : "<unknown>"));
 
             /* Fork a child to handle the connection. */
+            ProcessOptions options;
+            options.errorPrefix = "unexpected Nix daemon error: ";
+            options.dieWithParent = false;
+            options.runExitHandlers = true;
+            options.allowVfork = false;
             startProcess([&]() {
                 fdSocket.close();
 
@@ -821,7 +831,7 @@ static void daemonLoop(char * * argv)
                 processConnection(trusted);
 
                 exit(0);
-            }, false, "unexpected Nix daemon error: ", true);
+            }, options);
 
         } catch (Interrupted & e) {
             throw;
@@ -832,15 +842,6 @@ static void daemonLoop(char * * argv)
 }
 
 
-void run(Strings args)
-{
-    for (Strings::iterator i = args.begin(); i != args.end(); ) {
-        string arg = *i++;
-    }
-
-}
-
-
 int main(int argc, char * * argv)
 {
     return handleExceptions(argv[0], [&]() {
diff --git a/src/nix-instantiate/nix-instantiate.cc b/src/nix-instantiate/nix-instantiate.cc
index 9a6e178f514e..e7214e657bd5 100644
--- a/src/nix-instantiate/nix-instantiate.cc
+++ b/src/nix-instantiate/nix-instantiate.cc
@@ -86,8 +86,6 @@ void processExpr(EvalState & state, const Strings & attrPaths,
             }
         }
     }
-
-    state.printCanaries();
 }
 
 
diff --git a/src/nix-store/nix-store.cc b/src/nix-store/nix-store.cc
index c91bca97d534..87bc8c379de5 100644
--- a/src/nix-store/nix-store.cc
+++ b/src/nix-store/nix-store.cc
@@ -488,7 +488,7 @@ static void opReadLog(Strings opFlags, Strings opArgs)
             if (pathExists(logPath)) {
                 /* !!! Make this run in O(1) memory. */
                 string log = readFile(logPath);
-                writeFull(STDOUT_FILENO, (const unsigned char *) log.data(), log.size());
+                writeFull(STDOUT_FILENO, log);
                 found = true;
                 break;
             }
generated by cgit-pink 1.4.1 (git 2.44.2) at 2024-12-01T03·36+0000