sources/ostree: 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.ostree.

sources/org.osbuild.ostree

@@ -13,6 +13,8 @@ import sys
 import subprocess
 import uuid
 
+from typing import Dict
+
 
 SCHEMA = """
 "additionalProperties": false,
@@ -73,7 +75,7 @@ def ostree(*args, _input=None, **kwargs):
                    check=True)
 
 
-def download(commits, checksums, cache):
+def download(items, cache):
     # Prepare the cache and the output repo
     repo_cache = os.path.join(cache, "repo")
     ostree("init", mode="archive", repo=repo_cache)
@@ -83,8 +85,8 @@ def download(commits, checksums, cache):
     # explicitly here.
     ostree("config", "set", "repo.locking", "true", repo=repo_cache)
 
-    for commit in checksums:
-        remote = commits[commit]["remote"]
+    for commit, item in items.items():
+        remote = item["remote"]
         url = remote["url"]
         gpg = remote.get("gpgkeys", [])
         uid = str(uuid.uuid4())
@@ -111,56 +113,26 @@ def download(commits, checksums, cache):
                repo=repo_cache)
 
 
-def export(checksums, cache, output):
-    repo_cache = os.path.join(cache, "repo")
-
-    repo_out = os.path.join(output, "repo")
-    ostree("init", mode="archive", repo=repo_out)
-
-    for commit in checksums:
-        # Transfer the commit: remote → cache
-        print(f"exporting {commit}", file=sys.stderr)
-
-        ostree("pull-local", repo_cache, commit,
-               repo=repo_out)
-
-    json.dump({}, sys.stdout)
-
-
-def main(commits, options, checksums, cache, output):
+def main(items: Dict, cache: str):
     cache = os.path.join(cache, "org.osbuild.ostree")
-    download_only = not output
 
-    if not commits:
-        commits = options.get("commits", {})
-
-    if commits:
-        if not checksums and download_only:
-            checksums = [k for k, _ in commits.items()]
-
-        os.makedirs(cache, exist_ok=True)
-        try:
-            download(commits, checksums, cache)
-        except subprocess.CalledProcessError as e:
-            output = e.output.strip()
-            json.dump({"error": output}, sys.stdout)
-            return 1
-
-    if download_only:
+    if not items:
         json.dump({}, sys.stdout)
         return 0
 
-    os.makedirs(output, exist_ok=True)
-    export(checksums, cache, output)
+    os.makedirs(cache, exist_ok=True)
+    try:
+        download(items, cache)
+    except subprocess.CalledProcessError as e:
+        output = e.output.strip()
+        json.dump({"error": output}, sys.stdout)
+        return 1
 
+    json.dump({}, sys.stdout)
     return 0
 
 
 if __name__ == '__main__':
     source_args = json.load(sys.stdin)
-    r = main(source_args["items"],
-             source_args["options"],
-             source_args["checksums"],
-             source_args["cache"],
-             source_args.get("output"))
+    r = main(source_args["items"], source_args["cache"])
     sys.exit(r)