1 files changed, 124 insertions, 0 deletions
diff --git a/src/helpers/reset_section.py b/src/helpers/reset_section.py
new file mode 100755
index 000000000..7e464afd5
--- /dev/null
+++ b/src/helpers/reset_section.py
@@ -0,0 +1,124 @@
+#!/usr/bin/env python3
+#
+# Copyright VyOS maintainers and contributors <maintainers@vyos.io>
+#
+# 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 argparse
+import sys
+import os
+import grp
+
+from vyos.configsession import ConfigSession
+from vyos.config import Config
+from vyos.configdiff import get_config_diff
+from vyos.xml_ref import is_leaf
+
+
+CFG_GROUP = 'vyattacfg'
+DEBUG = False
+
+
+def type_str_to_list(value):
+    if isinstance(value, str):
+        return value.split()
+    raise argparse.ArgumentTypeError('path must be a whitespace separated string')
+
+
+parser = argparse.ArgumentParser()
+parser.add_argument('path', type=type_str_to_list, help='section to reload/rollback')
+parser.add_argument('--pid', help='pid of config session')
+
+group = parser.add_mutually_exclusive_group()
+group.add_argument('--reload', action='store_true', help='retry proposed commit')
+group.add_argument(
+    '--rollback', action='store_true', default=True, help='rollback to stable commit'
+)
+
+args = parser.parse_args()
+
+path = args.path
+reload = args.reload
+rollback = args.rollback
+pid = args.pid
+
+try:
+    if is_leaf(path):
+        sys.exit('path is leaf node: neither allowed nor useful')
+except ValueError:
+    if DEBUG:
+        sys.exit('nonexistent path: neither allowed nor useful')
+    else:
+        sys.exit()
+
+test = Config()
+in_session = test.in_session()
+
+if in_session:
+    if reload:
+        sys.exit('reset_section reload not available inside of a config session')
+
+    diff = get_config_diff(test)
+    if not diff.is_node_changed(path):
+        # No discrepancies at path after commit, hence no error to revert.
+        sys.exit()
+
+    del diff
+else:
+    if not reload:
+        sys.exit('reset_section rollback not available outside of a config session')
+
+del test
+
+
+session_id = int(pid) if pid else os.getppid()
+
+if in_session:
+    # check hint left by vyshim when ConfigError is from apply stage
+    hint_name = f'/tmp/apply_{session_id}'
+    if not os.path.exists(hint_name):
+        # no apply error; exit
+        sys.exit()
+    else:
+        # cleanup hint and continue with reset
+        os.unlink(hint_name)
+
+cfg_group = grp.getgrnam(CFG_GROUP)
+os.setgid(cfg_group.gr_gid)
+os.umask(0o002)
+
+shared = not bool(reload)
+
+session = ConfigSession(session_id, shared=shared)
+
+session_env = session.get_session_env()
+config = Config(session_env)
+
+d = config.get_config_dict(path, effective=True, get_first_key=True)
+
+if in_session:
+    session.discard()
+
+session.delete(path)
+session.commit()
+
+if not d:
+    # nothing more to do in either case of reload/rollback
+    sys.exit()
+
+session.set_section(path, d)
+out = session.commit()
+print(out)