inputs/files: rename refs to files

The `org.osbuild.files` input provides individual files to a stage.
Change the `refs` key in the returned dict to `files` to better
reflect that fact. Also adapt the documentation to indicate that
the keys actually paths and not necessarily checksums. This prepares
for future extension of the `files` input to pipeline origins.

inputs/org.osbuild.files

@@ -5,8 +5,8 @@ Inputs for individual files
 Provides all the files, named via their content hash, specified
 via `references` in a new directory.
 
-The returned data in `refs` is a dictionary where the keys are
-the content hash of a file and the values dictionaries with
+The returned data in `files` is a dictionary where the keys are
+paths to the provided files and the values dictionaries with
 metadata for it. The input itself currently does not set any
 metadata itself, but will forward any metadata set via the
 `metadata` property. Keys in that must start with a prefix,
@@ -86,7 +86,7 @@ class FilesInput(inputs.InputService):
         reply = {
             "path": target,
             "data": {
-                "refs": refs
+                "files": refs
             }
         }
         return reply

stages/org.osbuild.rpm

@@ -213,8 +213,8 @@ def parse_input(inputs):
     packages = inputs["packages"]
     path = packages["path"]
     data = packages["data"]
-    refs = data["refs"]
-    return path, refs
+    files = data["files"]
+    return path, files
 
 
 def main(tree, inputs, options):
@@ -231,13 +231,13 @@ def main(tree, inputs, options):
             ], check=True)
         print("imported gpg key")
 
-    for checksum, data in packages.items():
+    for filename, data in packages.items():
         if data.get("rpm.check_gpg"):
             subprocess.run([
                 "rpmkeys",
                 "--root", tree,
                 "--checksig",
-                checksum
+                filename
             ], cwd=pkgpath, stdout=subprocess.DEVNULL, check=True)
 
     script = f"""