cli: T6740: add a converter from set commands to config

debian/vyos-1x.install

@@ -28,6 +28,7 @@ usr/bin/initial-setup
 usr/bin/vyos-config-file-query
 usr/bin/vyos-config-to-commands
 usr/bin/vyos-config-to-json
+usr/bin/vyos-commands-to-config
 usr/bin/vyos-hostsd-client
 usr/lib
 usr/libexec/vyos/activate

python/vyos/utils/config.py

@@ -37,3 +37,44 @@ def read_saved_value(path: list):
     if len(res) == 1:
         return ' '.join(res)
     return res
+
+def parse_commands(cmds: str) -> dict:
+    from re import split as re_split
+    from shlex import split as shlex_split
+
+    from vyos.xml_ref import definition
+    from vyos.xml_ref.pkg_cache.vyos_1x_cache import reference
+
+    ref_tree = definition.Xml()
+    ref_tree.define(reference)
+
+    res = []
+
+    cmds = re_split(r'\n+', cmds)
+    for c in cmds:
+        cmd_parts = shlex_split(c)
+
+        if not cmd_parts:
+            # Ignore empty lines
+            continue
+
+        path = cmd_parts[1:]
+        op = cmd_parts[0]
+
+        try:
+            path, value = ref_tree.split_path(path)
+        except ValueError as e:
+            raise ValueError(f'Incorrect command: {e}')
+
+        entry = {}
+        entry["op"] = op
+        entry["path"] = path
+        entry["value"] = value
+
+        entry["is_multi"] = ref_tree.is_multi(path)
+        entry["is_leaf"] = ref_tree.is_leaf(path)
+        entry["is_tag"] = ref_tree.is_tag(path)
+
+        res.append(entry)
+
+    return res

python/vyos/xml_ref/definition.py

@@ -13,7 +13,7 @@
 # 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 typing import Optional, Union, Any, TYPE_CHECKING
+from typing import Tuple, Optional, Union, Any, TYPE_CHECKING
 
 # https://peps.python.org/pep-0484/#forward-references
 # for type 'ConfigDict'
@@ -90,6 +90,32 @@ def _is_tag_node(self, node: dict) -> bool:
         res = self._get_ref_node_data(node, 'node_type')
         return res == 'tag'
 
+    def exists(self, path: list) -> bool:
+        try:
+            _ = self._get_ref_path(path)
+            return True
+        except ValueError:
+            return False
+
+    def split_path(self, path: list) -> Tuple[list, Optional[str]]:
+        """ Splits a list into config path and value components """
+
+        # First, check if the complete path is valid by itself
+        if self.exists(path):
+            if self.is_valueless(path) or not self.is_leaf(path):
+                # It's a complete path for a valueless node
+                # or a path to an empy non-leaf node
+                return (path, None)
+            else:
+                raise ValueError(f'Path "{path}" needs a value or children')
+        else:
+            # If the complete path doesn't exist, it's probably a path with a value
+            if self.exists(path[0:-1]):
+                return (path[0:-1], path[-1])
+            else:
+                # Or not a valid path at all
+                raise ValueError(f'Path "{path}" is incorrect')
+
     def is_tag(self, path: list) -> bool:
         ref_path = path.copy()
         d = self.ref

src/utils/vyos-commands-to-config

@@ -0,0 +1,50 @@
+#! /usr/bin/python3
+#
+# Copyright (C) 2024 VyOS maintainers and contributors
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2 or later as
+# published by the Free Software Foundation.
+#
+# This program 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 General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+import sys
+import json
+
+from vyos.configtree import ConfigTree
+from vyos.utils.config import parse_commands
+
+
+def commands_to_config(cmds):
+    ct = ConfigTree('')
+    cmds = parse_commands(cmds)
+
+    for c in cmds:
+        if c["op"] == "set":
+            if c["is_leaf"]:
+                replace = False if c["is_multi"] else True
+                ct.set(c["path"], value=c["value"], replace=replace)
+            else:
+                ct.create_node(c["path"])
+        else:
+            raise ValueError(
+              f"\"{c['op']}\" is not a supported config operation")
+
+    return ct
+
+
+if __name__ == '__main__':
+    try:
+        cmds = sys.stdin.read()
+        ct = commands_to_config(cmds)
+        print(str(ct))
+    except Exception as e:
+        print(e)
+        sys.exit(1)