util: Preserve symlinks when copying

Currently the `copy_all` function resolves all symlinks and crashes on
broken symlinks. Instead it should copy symlinks as symlinks.

Fixes: https://pagure.io/pungi/issue/1084
Signed-off-by: Lubomír Sedlář <lsedlar@redhat.com>

pungi/util.py

@@ -564,7 +564,11 @@ def copy_all(src, dest):
         if os.path.isdir(source):
             shutil.copytree(source, destination)
         else:
-            shutil.copy2(source, destination)
+            if os.path.islink(source):
+                # It's a symlink, we should preserve it instead of resolving.
+                os.symlink(os.readlink(source), destination)
+            else:
+                shutil.copy2(source, destination)
 
     return recursive_file_list(src)