T8445: add activation script to indicate first installed boot

Add script to leave hint of first installed boot (as, say, distinguished
from first live boot, or subsequent); this is useful as pre/post
conditions and self-modification of activation scripts.

1 files changed, 15 insertions, 0 deletions

diff --git a/python/vyos/utils/activate.py b/python/vyos/utils/activate.py
index 588dda733..056bb2527 100644
--- a/python/vyos/utils/activate.py
+++ b/python/vyos/utils/activate.py
@@ -18,6 +18,7 @@ import json
 import typing
 from pathlib import Path
 
+from vyos.base import Warning as Warn
 from vyos.defaults import activation_list
 from vyos.defaults import activation_init
 from vyos.defaults import activation_hint
@@ -101,3 +102,17 @@ def refresh_activation_list():
         obj = new_obj
 
     orig_list_path.write_text(json.dumps(obj))
+
+
+first_installed_boot_file = '/run/first_installed_boot'
+
+
+def set_first_installed_boot():
+    try:
+        Path(first_installed_boot_file).touch(exist_ok=False)
+    except FileExistsError:
+        Warn('redundant set of first_installed_boot')
+
+
+def is_first_installed_boot():
+    return Path(first_installed_boot_file).exists()