Check examples/python/requirements.txt in CI (#2063)

* add `check_requirements.py`

* add `check_requirements.py` to CI checks

* add missing requirements

sorted alphabetically

* check if requirements are sorted

also intentionally submit incorrect `requirements.txt` so that CI fails

* fix `examples/python/requirements.txt`

.github/workflows/reusable_checks.yml

@@ -281,6 +281,10 @@ jobs:
       - name: Check for too large files
         run: |
           ./scripts/check_large_files.sh
+      
+      - name: Check Python example requirements
+        run: |
+          ./scripts/check_requirements.py
 
 # ---------------------------------------------------------------------------
 

examples/python/requirements.txt

@@ -1,17 +1,23 @@
 -r api_demo/requirements.txt
+-r arkitscenes/requirements.txt
 -r car/requirements.txt
 -r clock/requirements.txt
 -r colmap/requirements.txt
 -r deep_sdf/requirements.txt
 -r dicom/requirements.txt
+-r dna/requirements.txt
 -r minimal/requirements.txt
 -r mp_pose/requirements.txt
 -r multiprocessing/requirements.txt
 -r multithreading/requirements.txt
+-r notebook/requirements.txt
 -r nyud/requirements.txt
 -r objectron/requirements.txt
+-r opencv_canny/requirements.txt
 -r plots/requirements.txt
 -r raw_mesh/requirements.txt
+-r ros/requirements.txt
+-r segment_anything/requirements.txt
 -r stable_diffusion/requirements.txt
 -r text_logging/requirements.txt
 -r tracking_hf_opencv/requirements.txt

scripts/check_requirements.py

@@ -0,0 +1,45 @@
+#!/usr/bin/env python3
+
+import os
+from glob import glob
+
+
+def main() -> None:
+    failed = False
+
+    print("Checking `examples/python/requirements.txt`...")
+    with open("examples/python/requirements.txt") as f:
+        lines = f.read().strip().splitlines()
+        sorted_lines = lines.copy()
+        sorted_lines.sort()
+        requirements = set(lines)
+
+    missing = []
+    for path in glob("examples/python/*/requirements.txt"):
+        line = f"-r {os.path.relpath(path, 'examples/python')}"
+        if line not in requirements:
+            missing.append(line)
+
+    if len(missing) != 0:
+        print("\n`examples/python/requirements.txt` is missing the following requirements:")
+        for line in missing:
+            print(line)
+        failed = True
+
+    if lines != sorted_lines:
+        print("\n`examples/python/requirements.txt` is not correctly sorted.")
+        failed = True
+
+    if failed:
+        print("\nHere is what `examples/python/requirements.txt` should contain:")
+        expected = glob("examples/python/*/requirements.txt")
+        expected.sort()
+        for path in expected:
+            print(f"-r {os.path.relpath(path, 'examples/python')}")
+        exit(1)
+    else:
+        print("All clear.")
+
+
+if __name__ == "__main__":
+    main()