utils: T8541: add write-config-file-value helper

Introduce src/helpers/write-config-file-value.py to patch a saved config.boot
from scripts by writing a quoted CLI path with an optional value (omit --value
to create a valueless node).

Extend vyos.utils.config.write_saved_value() to safely update saved configs:
create missing parent nodes before tagging (ConfigTree.set_tag requires nodes
to exist) and then write the requested value/valueless leaf back to disk.

Remove the legacy serial console activation script which is now replaced by the
helper-based approach. The helper is run once during ISO Image assembly and will
inject the approprate serial console defintiions into config.boot.default.

1 files changed, 0 insertions, 43 deletions

diff --git a/src/activation-scripts/05-serial_console.py b/src/activation-scripts/05-serial_console.py
deleted file mode 100755
index ccda2ac4e..000000000
--- a/src/activation-scripts/05-serial_console.py
+++ /dev/null
@@ -1,43 +0,0 @@
-# Copyright (C) VyOS Inc.
-#
-# This library is free software; you can redistribute it and/or
-# modify it under the terms of the GNU Lesser General Public
-# License as published by the Free Software Foundation; either
-# version 2.1 of the License, or (at your option) any later version.
-#
-# This library is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-# Lesser General Public License for more details.
-#
-# You should have received a copy of the GNU Lesser General Public License
-# along with this library.  If not, see <http://www.gnu.org/licenses/>.
-
-from vyos.configtree import ConfigTree
-from vyos.system.image import is_live_boot
-from vyos.utils.kernel import get_kernel_serial_console
-from vyos.utils.serial import is_tty
-
-base = ['system', 'console', 'device']
-
-def activate(config: ConfigTree):
-    # Configure the kernel serial console only once during live boot. During
-    # installation, the user can define the console type (VT TTY or serial
-    # TTY). If this is not limited to live boot, the serial interface will
-    # always be re-added during system boot, even if it was removed from
-    # config.boot.
-    if not is_live_boot():
-        return
-
-    # Parse current kernel cmdline and continue only for valid serial console
-    # data. Prevent writing incomplete/invalid console settings to config.boot.
-    console_type, console_num, console_speed = get_kernel_serial_console()
-    device = f'{console_type}{console_num}'
-    if not is_tty(device) or not console_speed:
-        return
-
-    # The kernel was booted with a configured serial console, but no console
-    # is configured via CLI; align/fix the CLI configuration.
-    if not config.exists(base + [device]):
-        config.set(base + [device, 'speed'], value=console_speed)
-        config.set_tag(base)