Improved error handling at convert.py (#32)

Print error and exists if colmap or imagemagic fails. This avoid continuing the execution with errors and failing weirldly afterwards.

convert.py

@@ -10,6 +10,7 @@
 #
 
 import os
+import logging
 from argparse import ArgumentParser
 import shutil
 
@@ -31,34 +32,50 @@ if not args.skip_matching:
     os.makedirs(args.source_path + "/distorted/sparse", exist_ok=True)
 
     ## Feature extraction
-    os.system(colmap_command + " feature_extractor "\
+    feat_extracton_cmd = colmap_command + " feature_extractor "\
         "--database_path " + args.source_path + "/distorted/database.db \
         --image_path " + args.source_path + "/input \
         --ImageReader.single_camera 1 \
         --ImageReader.camera_model " + args.camera + " \
-        --SiftExtraction.use_gpu " + str(use_gpu))
+        --SiftExtraction.use_gpu " + str(use_gpu)
+    exit_code = os.system(feat_extracton_cmd)
+    if exit_code != 0:
+        logging.error(f"Feature extraction failed with code {exit_code}. Exiting.")
+        exit(exit_code)
 
     ## Feature matching
-    os.system(colmap_command + " exhaustive_matcher \
+    feat_matching_cmd = colmap_command + " exhaustive_matcher \
         --database_path " + args.source_path + "/distorted/database.db \
-        --SiftMatching.use_gpu " + str(use_gpu))
+        --SiftMatching.use_gpu " + str(use_gpu)
+    exit_code = os.system(feat_matching_cmd)
+    if exit_code != 0:
+        logging.error(f"Feature matching failed with code {exit_code}. Exiting.")
+        exit(exit_code)
 
     ### Bundle adjustment
     # The default Mapper tolerance is unnecessarily large,
     # decreasing it speeds up bundle adjustment steps.
-    os.system(colmap_command + " mapper \
+    mapper_cmd = (colmap_command + " mapper \
         --database_path " + args.source_path + "/distorted/database.db \
         --image_path "  + args.source_path + "/input \
         --output_path "  + args.source_path + "/distorted/sparse \
         --Mapper.ba_global_function_tolerance=0.000001")
+    exit_code = os.system(mapper_cmd)
+    if exit_code != 0:
+        logging.error(f"Mapper failed with code {exit_code}. Exiting.")
+        exit(exit_code)
 
 ### Image undistortion
 ## We need to undistort our images into ideal pinhole intrinsics.
-os.system(colmap_command + " image_undistorter \
+img_undist_cmd = (colmap_command + " image_undistorter \
     --image_path " + args.source_path + "/input \
     --input_path " + args.source_path + "/distorted/sparse/0 \
     --output_path " + args.source_path + "\
     --output_type COLMAP")
+exit_code = os.system(img_undist_cmd)
+if exit_code != 0:
+    logging.error(f"Mapper failed with code {exit_code}. Exiting.")
+    exit(exit_code)
 
 files = os.listdir(args.source_path + "/sparse")
 os.makedirs(args.source_path + "/sparse/0", exist_ok=True)
@@ -85,14 +102,23 @@ if(args.resize):
 
         destination_file = os.path.join(args.source_path, "images_2", file)
         shutil.copy2(source_file, destination_file)
-        os.system(magick_command + " mogrify -resize 50% " + destination_file)
+        exit_code = os.system(magick_command + " mogrify -resize 50% " + destination_file)
+        if exit_code != 0:
+            logging.error(f"50% resize failed with code {exit_code}. Exiting.")
+            exit(exit_code)
 
         destination_file = os.path.join(args.source_path, "images_4", file)
         shutil.copy2(source_file, destination_file)
-        os.system(magick_command + " mogrify -resize 25% " + destination_file)
+        exit_code = os.system(magick_command + " mogrify -resize 25% " + destination_file)
+        if exit_code != 0:
+            logging.error(f"25% resize failed with code {exit_code}. Exiting.")
+            exit(exit_code)
 
         destination_file = os.path.join(args.source_path, "images_8", file)
         shutil.copy2(source_file, destination_file)
-        os.system(magick_command + " mogrify -resize 12.5% " + destination_file)
+        exit_code = os.system(magick_command + " mogrify -resize 12.5% " + destination_file)
+        if exit_code != 0:
+            logging.error(f"12.5% resize failed with code {exit_code}. Exiting.")
+            exit(exit_code)
 
 print("Done.")