style(3p/nix): Enforce braces around loops and conditionals

This change was generated with:

  fd -e cc -e hh | xargs -I{} clang-tidy {} -p ~/projects/nix-build/ \
    --checks='-*,readability-braces-around-statements' --fix \
    -fix-errors

Some manual fixes were applied because some convoluted unbraced
statements couldn't be untangled by clang-tidy.

This commit still includes invalid files, but I decided to clean them
up in a subsequent commit so that it becomes more obvious where
clang-tidy failed. Maybe this will allow for a bug-report to
clang-tidy.

third_party/nix/src/libstore/build.cc

@@ -350,12 +350,17 @@ void Goal::waiteeDone(GoalPtr waitee, ExitCode result) {
   trace(format("waitee '%1%' done; %2% left") % waitee->name % waitees.size());
 
   if (result == ecFailed || result == ecNoSubstituters ||
-      result == ecIncompleteClosure)
+      result == ecIncompleteClosure) {
     ++nrFailed;
+  }
 
-  if (result == ecNoSubstituters) ++nrNoSubstituters;
+  if (result == ecNoSubstituters) {
+    ++nrNoSubstituters;
+  }
 
-  if (result == ecIncompleteClosure) ++nrIncompleteClosure;
+  if (result == ecIncompleteClosure) {
+    ++nrIncompleteClosure;
+  }
 
   if (waitees.empty() || (result == ecFailed && !settings.keepGoing)) {
     /* If we failed and keepGoing is not set, we remove all
@@ -1147,7 +1152,9 @@ void DerivationGoal::outputsSubstituted() {
   /*  If the substitutes form an incomplete closure, then we should
       build the dependencies of this derivation, but after that, we
       can still use the substitutes for this derivation itself. */
-  if (nrIncompleteClosure > 0) retrySubstitution = true;
+  if (nrIncompleteClosure > 0) {
+    retrySubstitution = true;
+  }
 
   nrFailed = nrNoSubstituters = nrIncompleteClosure = 0;
 
@@ -1659,7 +1666,9 @@ MakeError(NotDeterministic, BuildError)
 }
 
 HookReply DerivationGoal::tryBuildHook() {
-  if (!worker.tryBuildHook || !useDerivation) return rpDecline;
+  if (!worker.tryBuildHook || !useDerivation) {
+    return rpDecline;
+  }
 
   if (!worker.hook) worker.hook = std::make_unique<HookInstance>();
 
@@ -2231,7 +2240,9 @@ void DerivationGoal::startBuilder() {
        us.
     */
 
-    if (!fixedOutput) privateNetwork = true;
+    if (!fixedOutput) {
+      privateNetwork = true;
+    }
 
     userNamespaceSync.create();
 
@@ -3117,7 +3128,9 @@ void DerivationGoal::registerOutputs() {
     bool allValid = true;
     for (auto& i : drv->outputs)
       if (!worker.store.isValidPath(i.second.path)) allValid = false;
-    if (allValid) return;
+    if (allValid) {
+      return;
+    }
   }
 
   std::map<std::string, ValidPathInfo> infos;
@@ -3345,7 +3358,9 @@ void DerivationGoal::registerOutputs() {
     infos[i.first] = info;
   }
 
-  if (buildMode == bmCheck) return;
+  if (buildMode == bmCheck) {
+    return;
+  }
 
   /* Apply output checks. */
   checkOutputs(infos);
@@ -4095,9 +4110,10 @@ GoalPtr Worker::makeDerivationGoal(const Path& path,
         std::make_shared<DerivationGoal>(path, wantedOutputs, *this, buildMode);
     derivationGoals[path] = goal;
     wakeUp(goal);
-  } else
+  } else {
     (dynamic_cast<DerivationGoal*>(goal.get()))
         ->addWantedOutputs(wantedOutputs);
+  }
   return goal;
 }
 
@@ -4167,7 +4183,9 @@ void Worker::childStarted(GoalPtr goal, const set<int>& fds, bool inBuildSlot,
   child.inBuildSlot = inBuildSlot;
   child.respectTimeouts = respectTimeouts;
   children.emplace_back(child);
-  if (inBuildSlot) nrLocalBuilds++;
+  if (inBuildSlot) {
+    nrLocalBuilds++;
+  }
 }
 
 void Worker::childTerminated(Goal* goal, bool wakeSleepers) {
@@ -4413,14 +4431,22 @@ unsigned int Worker::exitStatus() {
    */
   unsigned int mask = 0;
   bool buildFailure = permanentFailure || timedOut || hashMismatch;
-  if (buildFailure) mask |= 0x04;  // 100
-  if (timedOut) mask |= 0x01;      // 101
-  if (hashMismatch) mask |= 0x02;  // 102
+  if (buildFailure) {
+    mask |= 0x04;  // 100
+  }
+  if (timedOut) {
+    mask |= 0x01;  // 101
+  }
+  if (hashMismatch) {
+    mask |= 0x02;  // 102
+  }
   if (checkMismatch) {
     mask |= 0x08;  // 104
   }
 
-  if (mask) mask |= 0x60;
+  if (mask) {
+    mask |= 0x60;
+  }
   return mask ? mask : 1;
 }
 
@@ -4430,9 +4456,9 @@ bool Worker::pathContentsGood(const Path& path) {
   LOG(INFO) << "checking path '" << path << "'...";
   auto info = store.queryPathInfo(path);
   bool res;
-  if (!pathExists(path))
+  if (!pathExists(path)) {
     res = false;
-  else {
+  } else {
     HashResult current = hashPath(info->narHash.type, path);
     Hash nullHash(htSHA256);
     res = info->narHash == nullHash || info->narHash == current.first;

third_party/nix/src/libstore/derivations.cc

@@ -185,19 +185,21 @@ Derivation Store::derivationFromPath(const Path& drvPath) {
 
 static void printString(string& res, const string& s) {
   res += '"';
-  for (const char* i = s.c_str(); *i; i++)
+  for (const char* i = s.c_str(); *i; i++) {
     if (*i == '\"' || *i == '\\') {
       res += "\\";
       res += *i;
-    } else if (*i == '\n')
+    } else if (*i == '\n') {
       res += "\\n";
-    else if (*i == '\r')
+    } else if (*i == '\r') {
       res += "\\r";
-    else if (*i == '\t')
+    } else if (*i == '\t') {
       res += "\\t";
-    else
+    } else {
       res += *i;
-  res += '"';
+    }
+    res += '"';
+  }
 }
 
 template <class ForwardIterator>
@@ -205,10 +207,11 @@ static void printStrings(string& res, ForwardIterator i, ForwardIterator j) {
   res += '[';
   bool first = true;
   for (; i != j; ++i) {
-    if (first)
+    if (first) {
       first = false;
-    else
+    } else {
       res += ',';
+    }
     printString(res, *i);
   }
   res += ']';

third_party/nix/src/libstore/download.cc

@@ -108,10 +108,14 @@ struct CurlDownloader : public Downloader {
 
     ~DownloadItem() {
       if (req) {
-        if (active) curl_multi_remove_handle(downloader.curlm, req);
+        if (active) {
+          curl_multi_remove_handle(downloader.curlm, req);
+        }
         curl_easy_cleanup(req);
       }
-      if (requestHeaders) curl_slist_free_all(requestHeaders);
+      if (requestHeaders) {
+        curl_slist_free_all(requestHeaders);
+      }
       try {
         if (!done)
           fail(DownloadError(
@@ -242,7 +246,9 @@ struct CurlDownloader : public Downloader {
     }
 
     void init() {
-      if (!req) req = curl_easy_init();
+      if (!req) {
+        req = curl_easy_init();
+      }
 
       curl_easy_reset(req);
 
@@ -316,8 +322,9 @@ struct CurlDownloader : public Downloader {
                        settings.netrcFile.get().c_str());
       curl_easy_setopt(req, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 
-      if (writtenToSink)
+      if (writtenToSink) {
         curl_easy_setopt(req, CURLOPT_RESUME_FROM_LARGE, writtenToSink);
+      }
 
       result.data = std::make_shared<std::string>();
       result.bodySize = 0;
@@ -505,7 +512,9 @@ struct CurlDownloader : public Downloader {
 
     workerThread.join();
 
-    if (curlm) curl_multi_cleanup(curlm);
+    if (curlm) {
+      curl_multi_cleanup(curlm);
+    }
   }
 
   void stopWorkerThread() {

third_party/nix/src/libstore/gc.cc

@@ -630,7 +630,9 @@ void LocalStore::tryToDelete(GCState& state, const Path& path) {
        ‘nix-store --delete’ doesn't have the unexpected effect of
        recursing into derivations and outputs. */
     state.dead.insert(visited.begin(), visited.end());
-    if (state.shouldDelete) deletePathRecursive(state, path);
+    if (state.shouldDelete) {
+      deletePathRecursive(state, path);
+    }
   }
 }
 
@@ -704,7 +706,9 @@ void LocalStore::collectGarbage(const GCOptions& options, GCResults& results) {
   state.shouldDelete = options.action == GCOptions::gcDeleteDead ||
                        options.action == GCOptions::gcDeleteSpecific;
 
-  if (state.shouldDelete) deletePath(reservedPath);
+  if (state.shouldDelete) {
+    deletePath(reservedPath);
+  }
 
   /* Acquire the global GC root.  This prevents
      a) New roots from being added.
@@ -737,7 +741,9 @@ void LocalStore::collectGarbage(const GCOptions& options, GCResults& results) {
      that is not reachable from `roots' is garbage. */
 
   if (state.shouldDelete) {
-    if (pathExists(trashDir)) deleteGarbage(state, trashDir);
+    if (pathExists(trashDir)) {
+      deleteGarbage(state, trashDir);
+    }
     try {
       createDirs(trashDir);
     } catch (SysError& e) {

third_party/nix/src/libstore/http-binary-cache-store.cc

@@ -77,8 +77,9 @@ class HttpBinaryCacheStore : public BinaryCacheStore {
     } catch (DownloadError& e) {
       /* S3 buckets return 403 if a file doesn't exist and the
          bucket is unlistable, so treat 403 as 404. */
-      if (e.error == Downloader::NotFound || e.error == Downloader::Forbidden)
+      if (e.error == Downloader::NotFound || e.error == Downloader::Forbidden) {
         return false;
+      }
       maybeDisable();
       throw;
     }

third_party/nix/src/libstore/local-fs-store.cc

@@ -96,10 +96,10 @@ std::shared_ptr<std::string> LocalFSStore::getBuildLog(const Path& path_) {
                           : fmt("%s/%s/%s", logDir, drvsLogDir, baseName);
     Path logBz2Path = logPath + ".bz2";
 
-    if (pathExists(logPath))
+    if (pathExists(logPath)) {
       return std::make_shared<std::string>(readFile(logPath));
 
-    else if (pathExists(logBz2Path)) {
+    } else if (pathExists(logBz2Path)) {
       try {
         return decompress("bzip2", readFile(logBz2Path));
       } catch (Error&) {

third_party/nix/src/libstore/local-store.cc

@@ -157,19 +157,17 @@ LocalStore::LocalStore(const Params& params)
   /* Check the current database schema and if necessary do an
      upgrade.  */
   int curSchema = getSchema();
-  if (curSchema > nixSchemaVersion)
+  if (curSchema > nixSchemaVersion) {
     throw Error(
         format(
             "current Nix store schema is version %1%, but I only support %2%") %
         curSchema % nixSchemaVersion);
 
-  else if (curSchema == 0) { /* new store */
+  } else if (curSchema == 0) { /* new store */
     curSchema = nixSchemaVersion;
     openDB(*state, true);
     writeFile(schemaPath, (format("%1%") % nixSchemaVersion).str());
-  }
-
-  else if (curSchema < nixSchemaVersion) {
+  } else if (curSchema < nixSchemaVersion) {
     if (curSchema < 5)
       throw Error(
           "Your Nix store has a database in Berkeley DB format,\n"
@@ -219,10 +217,9 @@ LocalStore::LocalStore(const Params& params)
     writeFile(schemaPath, (format("%1%") % nixSchemaVersion).str());
 
     lockFile(globalLock.get(), ltRead, true);
-  }
-
-  else
+  } else {
     openDB(*state, false);
+  }
 
   /* Prepare SQL statements. */
   state->stmtRegisterValidPath.create(
@@ -325,8 +322,9 @@ void LocalStore::openDB(State& state, bool create) {
   SetDllDirectoryW(L"");
 #endif
 
-  if (sqlite3_busy_timeout(db, 60 * 60 * 1000) != SQLITE_OK)
+  if (sqlite3_busy_timeout(db, 60 * 60 * 1000) != SQLITE_OK) {
     throwSQLiteError(db, "setting timeout");
+  }
 
   db.exec("pragma foreign_keys = 1");
 
@@ -347,8 +345,9 @@ void LocalStore::openDB(State& state, bool create) {
   {
     SQLiteStmt stmt;
     stmt.create(db, "pragma main.journal_mode;");
-    if (sqlite3_step(stmt) != SQLITE_ROW)
+    if (sqlite3_step(stmt) != SQLITE_ROW) {
       throwSQLiteError(db, "querying journal mode");
+    }
     prevMode = string((const char*)sqlite3_column_text(stmt, 0));
   }
   if (prevMode != mode &&
@@ -622,7 +621,9 @@ uint64_t LocalStore::addValidPath(State& state, const ValidPathInfo& info,
        derivations).  Note that if this throws an error, then the
        DB transaction is rolled back, so the path validity
        registration above is undone. */
-    if (checkOutputs) checkDerivationOutputs(info.path, drv);
+    if (checkOutputs) {
+      checkDerivationOutputs(info.path, drv);
+    }
 
     for (auto& i : drv.outputs) {
       state.stmtAddDerivationOutput.use()(id)(i.first)(i.second.path).exec();
@@ -1046,8 +1047,9 @@ Path LocalStore::addToStoreFromDump(const string& dump, const string& name,
       if (recursive) {
         StringSource source(dump);
         restorePath(realPath, source);
-      } else
+      } else {
         writeFile(realPath, dump);
+      }
 
       canonicalisePathMetaData(realPath, -1);
 
@@ -1059,8 +1061,9 @@ Path LocalStore::addToStoreFromDump(const string& dump, const string& name,
       if (recursive) {
         hash.first = hashAlgo == htSHA256 ? h : hashString(htSHA256, dump);
         hash.second = dump.size();
-      } else
+      } else {
         hash = hashPath(htSHA256, realPath);
+      }
 
       optimisePath(realPath);  // FIXME: combine with hashPath()
 
@@ -1297,14 +1300,16 @@ void LocalStore::verifyPath(const Path& path, const PathSet& store,
     } else {
       LOG(ERROR) << "path '" << path
                  << "' disappeared, but it still has valid referrers!";
-      if (repair) try {
+      if (repair) {
+        try {
           repairPath(path);
         } catch (Error& e) {
           LOG(WARNING) << e.msg();
           errors = true;
         }
-      else
+      } else {
         errors = true;
+      }
     }
 
     return;

third_party/nix/src/libstore/optimise-store.cc

@@ -206,7 +206,9 @@ retry:
      the store itself (we don't want or need to mess with its
      permissions). */
   bool mustToggle = dirOf(path) != realStoreDir;
-  if (mustToggle) makeWritable(dirOf(path));
+  if (mustToggle) {
+    makeWritable(dirOf(path));
+  }
 
   /* When we're done, make the directory read-only again and reset
      its timestamp back to 0. */

third_party/nix/src/libstore/references.cc

@@ -18,7 +18,9 @@ static void search(const unsigned char* s, size_t len, StringSet& hashes,
   static bool initialised = false;
   static bool isBase32[256];
   if (!initialised) {
-    for (unsigned int i = 0; i < 256; ++i) isBase32[i] = false;
+    for (unsigned int i = 0; i < 256; ++i) {
+      isBase32[i] = false;
+    }
     for (unsigned int i = 0; i < base32Chars.size(); ++i)
       isBase32[(unsigned char)base32Chars[i]] = true;
     initialised = true;

third_party/nix/src/libstore/remote-store.cc

@@ -33,7 +33,9 @@ Path readStorePath(Store& store, Source& from) {
 template <class T>
 T readStorePaths(Store& store, Source& from) {
   T paths = readStrings<T>(from);
-  for (auto& i : paths) store.assertStorePath(i);
+  for (auto& i : paths) {
+    store.assertStorePath(i);
+  }
   return paths;
 }
 
@@ -600,10 +602,11 @@ void RemoteStore::queryMissing(const PathSet& targets, PathSet& willBuild,
                                unsigned long long& narSize) {
   {
     auto conn(getConnection());
-    if (GET_PROTOCOL_MINOR(conn->daemonVersion) < 19)
+    if (GET_PROTOCOL_MINOR(conn->daemonVersion) < 19) {
       // Don't hold the connection handle in the fallback case
       // to prevent a deadlock.
       goto fallback;
+    }
     conn->to << wopQueryMissing << targets;
     conn.processStderr();
     willBuild = readStorePaths<PathSet>(*this, conn->from);

third_party/nix/src/libstore/sqlite.cc

@@ -14,15 +14,19 @@ namespace nix {
   int exterr = sqlite3_extended_errcode(db);
 
   auto path = sqlite3_db_filename(db, nullptr);
-  if (!path) path = "(in-memory)";
+  if (!path) {
+    path = "(in-memory)";
+  }
 
   if (err == SQLITE_BUSY || err == SQLITE_PROTOCOL) {
     throw SQLiteBusy(
         err == SQLITE_PROTOCOL
             ? fmt("SQLite database '%s' is busy (SQLITE_PROTOCOL)", path)
             : fmt("SQLite database '%s' is busy", path));
-  } else
-    throw SQLiteError("%s: %s (in '%s')", fs.s, sqlite3_errstr(exterr), path);
+  } else {
+    throw
+  }
+  SQLiteError("%s: %s (in '%s')", fs.s, sqlite3_errstr(exterr), path);
 }
 
 SQLite::SQLite(const Path& path) {
@@ -34,8 +38,9 @@ SQLite::SQLite(const Path& path) {
 
 SQLite::~SQLite() {
   try {
-    if (db && sqlite3_close(db) != SQLITE_OK)
+    if (db && sqlite3_close(db) != SQLITE_OK) {
       throwSQLiteError(db, "closing database");
+    }
   } catch (...) {
     ignoreException();
   }
@@ -81,8 +86,9 @@ SQLiteStmt::Use& SQLiteStmt::Use::operator()(const std::string& value,
     if (sqlite3_bind_text(stmt, curArg++, value.c_str(), -1,
                           SQLITE_TRANSIENT) != SQLITE_OK)
       throwSQLiteError(stmt.db, "binding argument");
-  } else
+  } else {
     bind();
+  }
   return *this;
 }
 
@@ -90,14 +96,16 @@ SQLiteStmt::Use& SQLiteStmt::Use::operator()(int64_t value, bool notNull) {
   if (notNull) {
     if (sqlite3_bind_int64(stmt, curArg++, value) != SQLITE_OK)
       throwSQLiteError(stmt.db, "binding argument");
-  } else
+  } else {
     bind();
+  }
   return *this;
 }
 
 SQLiteStmt::Use& SQLiteStmt::Use::bind() {
-  if (sqlite3_bind_null(stmt, curArg++) != SQLITE_OK)
+  if (sqlite3_bind_null(stmt, curArg++) != SQLITE_OK) {
     throwSQLiteError(stmt.db, "binding argument");
+  }
   return *this;
 }
 
@@ -134,21 +142,24 @@ bool SQLiteStmt::Use::isNull(int col) {
 
 SQLiteTxn::SQLiteTxn(sqlite3* db) {
   this->db = db;
-  if (sqlite3_exec(db, "begin;", 0, 0, 0) != SQLITE_OK)
+  if (sqlite3_exec(db, "begin;", 0, 0, 0) != SQLITE_OK) {
     throwSQLiteError(db, "starting transaction");
+  }
   active = true;
 }
 
 void SQLiteTxn::commit() {
-  if (sqlite3_exec(db, "commit;", 0, 0, 0) != SQLITE_OK)
+  if (sqlite3_exec(db, "commit;", 0, 0, 0) != SQLITE_OK) {
     throwSQLiteError(db, "committing transaction");
+  }
   active = false;
 }
 
 SQLiteTxn::~SQLiteTxn() {
   try {
-    if (active && sqlite3_exec(db, "rollback;", 0, 0, 0) != SQLITE_OK)
+    if (active && sqlite3_exec(db, "rollback;", 0, 0, 0) != SQLITE_OK) {
       throwSQLiteError(db, "aborting transaction");
+    }
   } catch (...) {
     ignoreException();
   }

third_party/nix/src/libstore/store-api.cc

@@ -42,7 +42,9 @@ Path Store::toStorePath(const Path& path) const {
 Path Store::followLinksToStore(const Path& _path) const {
   Path path = absPath(_path);
   while (!isInStore(path)) {
-    if (!isLink(path)) break;
+    if (!isLink(path)) {
+      break;
+    }
     string target = readLink(path);
     path = absPath(target, dirOf(path));
   }
@@ -828,10 +830,11 @@ StoreType getStoreType(const std::string& uri, const std::string& stateDir) {
   } else if (uri == "" || uri == "auto") {
     if (access(stateDir.c_str(), R_OK | W_OK) == 0)
       return tLocal;
-    else if (pathExists(settings.nixDaemonSocketFile))
+    else if (pathExists(settings.nixDaemonSocketFile)) {
       return tDaemon;
-    else
+    } else {
       return tLocal;
+    }
   } else {
     return tOther;
   }