T7709: use write_file_sync/atomic in vyos-save-config.py script

Config save is provided by the helper script in both CLI and
configsession (hence also in the http api).

Use utilities write_file_sync and write_file_atomic, in accordance with
permissions and location:

If the target is in /opt/vyatta/etc/config or /config, use
write_file_sync; if, moreover, the caller has permissions, use
write_file_atomic. Otherwise, fall back to util write_file.

1 files changed, 10 insertions, 0 deletions

diff --git a/python/vyos/component_version.py b/python/vyos/component_version.py
index 136bd36e8..13fb8333f 100644
--- a/python/vyos/component_version.py
+++ b/python/vyos/component_version.py
@@ -209,6 +209,16 @@ def version_info_prune_component(x: VersionInfo, y: VersionInfo) -> VersionInfo:
     x.component = {k: v for k, v in x.component.items() if k in y.component}
 
 
+def add_system_version_string(config_str: str = None) -> str:
+    """Wrap config string with system version and return string."""
+    version_info = version_info_from_system()
+    if config_str is not None:
+        version_info.update_config_body(config_str)
+    version_info.update_footer()
+
+    return version_info.write_string()
+
+
 def add_system_version(config_str: str = None, out_file: str = None):
     """Wrap config string with system version and write to out_file.