Support copy of scmsync packages

There are two ways, either copy the scmsync definition or drop it
when creating a new package meta.

If we keep it, we must not ask OBS to copy sources, it is syncing it
anyway.

We could add another option to skip the scmsync tag copy, but we keep
it as default, because we don't want to give a different view of the
the sources to the user.  The client side copy is doing this.

osc/core.py

@@ -3206,7 +3206,7 @@ def checkout_package(
 
 def replace_pkg_meta(
     pkgmeta, new_name: str, new_prj: str, keep_maintainers=False, dst_userid=None, keep_develproject=False,
-    keep_lock: bool = False,
+    keep_lock: bool = False, keep_scmsync: bool = True,
 ):
     """
     update pkgmeta with new new_name and new_prj and set calling user as the
@@ -3230,6 +3230,9 @@ def replace_pkg_meta(
     if not keep_lock:
         for node in root.findall("lock"):
             root.remove(node)
+    if not keep_scmsync:
+        for node in root.findall("scmsync"):
+            root.remove(node)
     return ET.tostring(root, encoding=ET_ENCODING)
 
 
@@ -3732,12 +3735,13 @@ def copy_pac(
         if not any([expand, revision]):
             raise oscerr.OscValueError("Cannot copy package. Source and target are the same.")
 
+    meta = None
     if not (src_apiurl == dst_apiurl and src_project == dst_project
             and src_package == dst_package):
         src_meta = show_package_meta(src_apiurl, src_project, src_package)
         dst_userid = conf.get_apiurl_usr(dst_apiurl)
-        src_meta = replace_pkg_meta(src_meta, dst_package, dst_project, keep_maintainers,
-                                    dst_userid, keep_develproject)
+        meta = replace_pkg_meta(src_meta, dst_package, dst_project, keep_maintainers,
+                                dst_userid, keep_develproject, keep_scmsync=(not client_side_copy))
 
         url = make_meta_url('pkg', (dst_project, dst_package), dst_apiurl)
         found = None
@@ -3748,7 +3752,15 @@ def copy_pac(
         if force_meta_update or not found:
             print('Sending meta data...')
             u = makeurl(dst_apiurl, ['source', dst_project, dst_package, '_meta'])
-            http_PUT(u, data=src_meta)
+            http_PUT(u, data=meta)
+
+    if meta is None:
+        meta = show_package_meta(dst_apiurl, dst_project, dst_package)
+
+    root = ET.fromstring(meta)
+    if root.find("scmsync") is not None:
+        print("Note: package source is managed via SCM")
+        return
 
     print('Copying files...')
     if not client_side_copy: