sources/curl: remove export functionality

Since the `sources.SourcesServer` has been removed, nothing is
using the export functionality anymore. Inputs are now used to
make content in the store available to stages. Remove all the
export logic from org.osbuild.curl.

sources/org.osbuild.curl

@@ -24,6 +24,8 @@ import sys
 import tempfile
 import time
 
+from typing import Dict
+
 
 SCHEMA = """
 "additionalProperties": false,
@@ -214,57 +216,23 @@ def download(checksums, urls, cache):
         return 0
 
 
-def export(checksums, cache, output):
-    for checksum in checksums:
-        try:
-            subprocess.run(
-                [
-                    "cp",
-                    "--reflink=auto",
-                    f"{cache}/{checksum}",
-                    f"{output}/{checksum}",
-                ],
-                check=True,
-            )
-        except subprocess.CalledProcessError as e:
-            json.dump({"error": e.output}, sys.stdout)
-            return 1
+def main(urls: Dict, cache: str):
+    cache = os.path.join(cache, "org.osbuild.files")
+
+    if not urls:
+        json.dump({}, sys.stdout)
+        return 0
+
+    os.makedirs(cache, exist_ok=True)
+    res = download(urls.keys(), urls, cache)
+    if res != 0:
+        return res
 
     json.dump({}, sys.stdout)
     return 0
 
 
-def main(urls, options, checksums, cache, output):
-    cache = os.path.join(cache, "org.osbuild.files")
-    download_only = not output
-
-    if not urls:
-        urls = options.get("urls", [])
-
-    if urls:
-        if not checksums and download_only:
-            checksums = [k for k, _ in urls.items()]
-
-        os.makedirs(cache, exist_ok=True)
-        res = download(checksums, urls, cache)
-        if res != 0:
-            return res
-
-    if download_only:
-        json.dump({}, sys.stdout)
-        return 0
-
-    os.makedirs(output, exist_ok=True)
-    res = export(checksums, cache, output)
-
-    return res
-
-
 if __name__ == '__main__':
     args = json.load(sys.stdin)
-    r = main(args["items"],
-             args["options"],
-             args["checksums"],
-             args["cache"],
-             args.get("output"))
+    r = main(args["items"], args["cache"])
     sys.exit(r)