netdata: allow UI to load when running as non-root

pkgs/tools/system/netdata/default.nix

@@ -13,6 +13,9 @@ stdenv.mkDerivation rec{
 
   buildInputs = [ autoreconfHook zlib pkgconfig libuuid ];
 
+  # Allow UI to load when running as non-root
+  patches = [ ./web_access.patch ];
+
   preConfigure = ''
     export ZLIB_CFLAGS=" "
     export ZLIB_LIBS="-lz"

pkgs/tools/system/netdata/web_access.patch

@@ -0,0 +1,20 @@
+--- a/src/web_client.c.orig
++++ b/src/web_client.c
+@@ -331,7 +331,7 @@
+         buffer_sprintf(w->response.data, "File '%s' does not exist, or is not accessible.", webfilename);
+         return 404;
+     }
+-
++#if 0
+     // check if the file is owned by expected user
+     if(stat.st_uid != web_files_uid()) {
+         error("%llu: File '%s' is owned by user %u (expected user %u). Access Denied.", w->id, webfilename, stat.st_uid, web_files_uid());
+@@ -345,7 +345,7 @@
+         buffer_sprintf(w->response.data, "Access to file '%s' is not permitted.", webfilename);
+         return 403;
+     }
+-
++#endif
+     if((stat.st_mode & S_IFMT) == S_IFDIR) {
+         snprintfz(webfilename, FILENAME_MAX, "%s/index.html", filename);
+         return mysendfile(w, webfilename);