Merge pull request #12855 from NixOS/mergify/bp/2.26-maintenance/pr-12765

Add various clang tidy fixes (backport #12765)

src/libstore/daemon.cc

@@ -1025,6 +1025,7 @@ void processConnection(
 {
 #ifndef _WIN32 // TODO need graceful async exit support on Windows?
     auto monitor = !recursive ? std::make_unique<MonitorFdHup>(from.fd) : nullptr;
+    (void) monitor; // suppress warning
 #endif
 
     /* Exchange the greeting. */

src/libstore/local-store.cc

@@ -248,7 +248,7 @@ LocalStore::LocalStore(
     else if (curSchema == 0) { /* new store */
         curSchema = nixSchemaVersion;
         openDB(*state, true);
-        writeFile(schemaPath, fmt("%1%", nixSchemaVersion), 0666, true);
+        writeFile(schemaPath, fmt("%1%", curSchema), 0666, true);
     }
 
     else if (curSchema < nixSchemaVersion) {

src/libutil/git.cc

@@ -33,7 +33,7 @@ std::optional<Mode> decodeMode(RawMode m) {
 static std::string getStringUntil(Source & source, char byte)
 {
     std::string s;
-    char n[1];
+    char n[1] = { 0 };
     source(std::string_view { n, 1 });
     while (*n != byte) {
         s += *n;

tests/nixos/ca-fd-leak/sender.c

@@ -19,7 +19,7 @@ int main(int argc, char **argv) {
     struct sockaddr_un data;
     data.sun_family = AF_UNIX;
     data.sun_path[0] = 0;
-    strcpy(data.sun_path + 1, argv[1]);
+    strncpy(data.sun_path + 1, argv[1], sizeof(data.sun_path) - 2);
 
     // Now try to connect, To ensure we work no matter what order we are
     // executed in, just busyloop here.

tests/nixos/ca-fd-leak/smuggler.c

@@ -5,6 +5,7 @@
 #include <stdio.h>
 #include <unistd.h>
 #include <assert.h>
+#include <string.h>
 
 int main(int argc, char **argv) {