metadata: support virtual manifest

rust2rpm/inspector.py

@@ -32,9 +32,7 @@ def main():
         if len(deps) > 0:
             print("\n".join(sorted(normalize_deps(deps))))
 
-    for f in files:
-        f = f.rstrip()
-        md = Metadata.from_file(f)
+    def process_metadata(md):
         if args.name:
             print(md.name)
         if args.version:
@@ -67,5 +65,15 @@ def main():
         if args.test_requires:
             print_deps(md.dev_dependencies)
 
+    for f in files:
+        f = f.rstrip()
+        mds = Metadata.from_file(f)
+        if isinstance(mds, list):
+            for md in mds:
+                process_metadata(md)
+        else:
+            process_metadata(mds)
+
+
 if __name__ == "__main__":
     main()

rust2rpm/metadata.py

@@ -3,8 +3,10 @@ __all__ = ["Dependency", "Metadata"]
 import collections
 import copy
 import json
+import os.path
 import re
 import subprocess
+from urllib.parse import urlparse
 
 
 Requirement = collections.namedtuple('Requirement', ('kind',
@@ -334,9 +336,40 @@ class Metadata:
 
     @classmethod
     def from_file(cls, path):
-        metadata = subprocess.check_output(["cargo", "read-manifest",
-                                            f"--manifest-path={path}"])
-        return cls.from_json(json.loads(metadata))
+        try:
+            return cls.from_json(Metadata.manifest(path))
+        except subprocess.CalledProcessError:
+            # If fails, we still check that is a workspace
+            members = Metadata.members(path)
+            if members:
+                return [
+                    cls.from_json(Metadata.manifest(m)) for m in members
+                ]
+            # Is not a workspace? re-raise the exception
+            raise
+
+    @staticmethod
+    def manifest(path):
+        return json.loads(
+            subprocess.check_output(["cargo", "read-manifest",
+                                     f"--manifest-path={path}"]))
+
+    @staticmethod
+    def metadata(path, deps=False):
+        cmd = ["cargo", "metadata", "--format-version=1",
+               f"--manifest-path={path}"]
+        if not deps:
+            cmd.append("--no-deps")
+        return json.loads(subprocess.check_output(cmd))
+
+    @staticmethod
+    def members(path):
+        members = []
+        metadata = Metadata.metadata(path)
+        for workspace in metadata.get('workspace_members', []):
+            path = re.search(r'\((.*)\)', workspace).group(1)
+            members.append(os.path.join(urlparse(path).path, 'Cargo.toml'))
+        return members
 
     @property
     def all_dependencies(self):