config-mgmt: T4942: add conf_mode script

1 files changed, 96 insertions, 0 deletions

diff --git a/src/conf_mode/config_mgmt.py b/src/conf_mode/config_mgmt.py
new file mode 100755
index 000000000..c681a8405
--- /dev/null
+++ b/src/conf_mode/config_mgmt.py
@@ -0,0 +1,96 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) 2023 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 os
+import sys
+
+from vyos import ConfigError
+from vyos.config import Config
+from vyos.config_mgmt import ConfigMgmt
+from vyos.config_mgmt import commit_post_hook_dir, commit_hooks
+
+def get_config(config=None):
+    if config:
+        conf = config
+    else:
+        conf = Config()
+
+    base = ['system', 'config-management']
+    if not conf.exists(base):
+        return None
+
+    mgmt = ConfigMgmt(config=conf)
+
+    return mgmt
+
+def verify(_mgmt):
+    return
+
+def generate(mgmt):
+    if mgmt is None:
+        return
+
+    mgmt.initialize_revision()
+
+def apply(mgmt):
+    if mgmt is None:
+        return
+
+    locations = mgmt.locations
+    archive_target = os.path.join(commit_post_hook_dir,
+                               commit_hooks['commit_archive'])
+    if locations:
+        try:
+            os.symlink('/usr/bin/config-mgmt', archive_target)
+        except FileExistsError:
+            pass
+        except OSError as exc:
+            raise ConfigError from exc
+    else:
+        try:
+            os.unlink(archive_target)
+        except FileNotFoundError:
+            pass
+        except OSError as exc:
+            raise ConfigError from exc
+
+    revisions = mgmt.max_revisions
+    revision_target = os.path.join(commit_post_hook_dir,
+                               commit_hooks['commit_revision'])
+    if revisions > 0:
+        try:
+            os.symlink('/usr/bin/config-mgmt', revision_target)
+        except FileExistsError:
+            pass
+        except OSError as exc:
+            raise ConfigError from exc
+    else:
+        try:
+            os.unlink(revision_target)
+        except FileNotFoundError:
+            pass
+        except OSError as exc:
+            raise ConfigError from exc
+
+if __name__ == '__main__':
+    try:
+        c = get_config()
+        verify(c)
+        generate(c)
+        apply(c)
+    except ConfigError as e:
+        print(e)
+        sys.exit(1)