fix(cli): crash when RPM spec file not found

Make fatbuildrctl report artifact error instead of crashing when
building an RPM package and RPM spec file is not found.

fix #165

CHANGELOG.md

@@ -191,6 +191,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   execution error to report in task journal.
 - Check container image and build environment exist or fail with appropriate
   error at the beginning of build tasks (#17).
+- Fix `fatbuildrctl` crash when RPM spec file is not found (#165).
 - docs:
   - Add missing path parameter in REST API to retrieve artifact information.
   - Add missing optional `architectures` parameter in instances pipelines

fatbuildr/artifact.py

@@ -275,16 +275,24 @@ def architecture_dependent(self):
 
         To determine the value, the BuildArch parameter is checked in RPM spec
         file. Unless BuildArch is set to noarch, the source package is
-        considered architecture dependent."""
+        considered architecture dependent.
+
+        Raise FatbuildrArtifactError if RPM spec file not found."""
         check_file = self.place.joinpath(self.format, f"{self.artifact}.spec")
-        with open(check_file, 'r') as fh:
-            for line in fh:
-                if (
-                    line.replace(' ', '')
-                    .replace('\t', '')
-                    .startswith('BuildArch:noarch')
-                ):
-                    return False
+        try:
+            with open(check_file, 'r') as fh:
+                for line in fh:
+                    if (
+                        line.replace(' ', '')
+                        .replace('\t', '')
+                        .startswith('BuildArch:noarch')
+                    ):
+                        return False
+        except FileNotFoundError:
+            raise FatbuildrArtifactError(
+                f"RPM spec file {check_file} not found, unable to determine if "
+                "package is architecture dependent"
+            )
         return True
 
     @property