build: T3664: fail the build on external command errors

scripts/image-build/build-vyos-image

@@ -78,6 +78,8 @@ import utils
 import defaults
 import raw_image
 
+from utils import cmd
+
 # argparse converts hyphens to underscores,
 # so for lookups in the original options hash we have to convert them back
 def field_to_option(s):
@@ -450,7 +452,7 @@ if __name__ == "__main__":
 
         ## Clean up earlier build state and artifacts
         print("I: Cleaning the build workspace")
-        os.system("lb clean")
+        cmd("lb clean")
         #iter(lambda p: shutil.rmtree(p, ignore_errors=True),
         #  ['config/binary', 'config/bootstrap', 'config/chroot', 'config/common', 'config/source'])
         artifacts = functools.reduce(
@@ -575,10 +577,7 @@ if __name__ == "__main__":
             print("D: live-build configuration command")
             print(lb_config_command)
 
-        result = os.system(lb_config_command)
-        if result > 0:
-            print("E: live-build config failed")
-            sys.exit(1)
+        cmd(lb_config_command)
 
         ## In dry-run mode, exit at this point
         if build_config["dry_run"]:
@@ -595,9 +594,7 @@ if __name__ == "__main__":
         print("I: Starting image build")
         if debug:
             print("D: It's not like I'm building this specially for you or anything!")
-        res = os.system("lb build 2>&1")
-        if res > 0:
-            sys.exit(res)
+        cmd("lb build 2>&1")
 
         # Copy the image
         shutil.copy("live-image-{0}.hybrid.iso".format(build_config["architecture"]), iso_file)
@@ -613,11 +610,11 @@ if __name__ == "__main__":
             # For those cases, we support running a post-build hook on the raw image.
             # The image_format field should be 'raw' if a post-build hook is used.
             hook_path = build_config["post_build_hook"]
-            os.system(f"{hook_path} {raw_image}")
+            cmd(f"{hook_path} {raw_image}")
         else:
             # Most other formats, thankfully, can be produced with just `qemu-img convert`
             other_formats = filter(lambda x: x not in ["iso", "raw"], build_config["image_format"])
             for f in other_formats:
                 target = f"{os.path.splitext(raw_image)[0]}.{f}"
                 print(f"I: Building {f} file {target}")
-                os.system(f"qemu-img convert -f raw -O {f} {raw_image} {target}")
+                cmd(f"qemu-img convert -f raw -O {f} {raw_image} {target}")

scripts/image-build/raw_image.py

@@ -25,11 +25,7 @@ import vyos.utils.process
 SQUASHFS_FILE = 'live/filesystem.squashfs'
 VERSION_FILE = 'version.json'
 
-
-def cmd(command):
-    res = vyos.utils.process.call(command, shell=True)
-    if res > 0:
-        raise OSError(f"Command '{command}' failed")
+from utils import cmd
 
 def mkdir(path):
     os.makedirs(path, exist_ok=True)

scripts/image-build/utils.py

@@ -23,6 +23,7 @@ import shutil
 
 # Local modules
 import defaults
+import vyos
 
 def check_build_config():
     if not os.path.exists(defaults.BUILD_CONFIG):
@@ -76,3 +77,8 @@ def check_system_dependencies(deps):
         raise OSError(checker.format_missing_dependencies())
     else:
         pass
+
+def cmd(command):
+    res = vyos.utils.process.call(command, shell=True)
+    if res > 0:
+        raise OSError(f"Command '{command}' failed")