Enable clazy in drone

Signed-off-by: Felix Weilbach <felix.weilbach@nextcloud.com>

.drone.yml

@@ -53,15 +53,15 @@ steps:
       path: /drone/build
   commands:
     - cd /drone/build
-    - cmake -GNinja -DCMAKE_EXPORT_COMPILE_COMMANDS=ON -DCMAKE_C_COMPILER=clang-10 -DCMAKE_CXX_COMPILER=clang++-10 -DCMAKE_BUILD_TYPE=Debug -DBUILD_UPDATER=ON -DBUILD_TESTING=1 -DECM_ENABLE_SANITIZERS=address ../src
+    - cmake -GNinja -DCMAKE_EXPORT_COMPILE_COMMANDS=ON -DCMAKE_C_COMPILER=clang-10 -DCMAKE_CXX_COMPILER=clazy -DCMAKE_BUILD_TYPE=Debug -DBUILD_UPDATER=ON -DBUILD_TESTING=1 -DECM_ENABLE_SANITIZERS=address ../src
 - name: compile
   image: ghcr.io/nextcloud/continuous-integration-client:client-5.12-18
   volumes:
     - name: build
       path: /drone/build
   commands:
     - cd /drone/build
-    - ninja
+    - ninja 2>1 | /drone/src/admin/linux/count_compiler_warnings.py /drone/src
 - name: test
   image: ghcr.io/nextcloud/continuous-integration-client:client-5.12-18
   volumes:

admin/linux/count_compiler_warnings.py

@@ -0,0 +1,40 @@
+#!/usr/bin/env python3
+
+# Small script that counts the warnings which the compiler emits
+# and takes care that not more warnings are added.
+
+import sys
+import re
+import requests
+
+
+if len(sys.argv) != 2:
+    print(f"Usage: {sys.argv[0]} REPOSITORY_PATH")
+    sys.exit(1)
+
+repository_path = sys.argv[1]
+warning_regex = re.compile(r'warning:', re.M)
+max_allowed_warnings_count_response = requests.get(
+    "https://nextclouddesktopwarningscount.felixweilbach.de")
+
+if max_allowed_warnings_count_response.status_code != 200:
+    print('Can not get maximum number of allowed warnings')
+    sys.exit(1)
+
+max_allowed_warnings_count = int(max_allowed_warnings_count_response.content)
+
+print("Max number of allowed warnings:", max_allowed_warnings_count)
+
+warnings_count = 0
+
+for line in sys.stdin:
+    if warning_regex.findall(line):
+        warnings_count += 1
+
+    print(line, end="")
+
+    if warnings_count > max_allowed_warnings_count:
+        print("Error: Too many warnings! You probably introduced a new warning!")
+        sys.exit(1)
+
+print("Total number of warnings:", warnings_count)