bgp: T548: Migrate maximum-paths to afi ipv4 maximum-paths

1 files changed, 61 insertions, 0 deletions

diff --git a/src/migration-scripts/quagga/7-to-8 b/src/migration-scripts/quagga/7-to-8
new file mode 100755
index 000000000..a53614718
--- /dev/null
+++ b/src/migration-scripts/quagga/7-to-8
@@ -0,0 +1,61 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) 2021 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/>.
+
+# - T548, Migrate "bgp xxx maximum-paths ebgp/ibgp xxx" to
+#  "bgp xxx address-family ipv4-unicast maximum-paths ebgp/ibgp xxx"
+
+import sys
+from vyos.configtree import ConfigTree
+
+if (len(sys.argv) < 2):
+    print("Must specify file name!")
+    sys.exit(1)
+
+file_name = sys.argv[1]
+
+with open(file_name, 'r') as f:
+    config_file = f.read()
+
+base = ['protocols', 'bgp']
+config = ConfigTree(config_file)
+
+if not config.exists(base):
+    # Nothing to do
+    sys.exit(0)
+
+# Check if BGP is actually configured and obtain the ASN
+asn_list = config.list_nodes(base)
+if asn_list:
+    # There's always just one BGP node, if any
+    bgp_base = base + [asn_list[0]]
+
+    # Check if "bgp xxx maximum-paths" exists, migrate to "bgp xxx address-family ipv4-unicast maximum-paths"
+    max_path = bgp_base + ['maximum-paths']
+    if config.exists(max_path):
+        if config.exists(max_path + ['ebgp']):
+            max_ebgp = config.return_value(max_path + ['ebgp'])
+            config.set(bgp_base + ['address-family', 'ipv4-unicast', 'maximum-paths', 'ebgp'], max_ebgp)
+        if config.exists(max_path + ['ibgp']):
+            max_ibgp = config.return_value(max_path + ['ibgp'])
+            config.set(bgp_base + ['address-family', 'ipv4-unicast', 'maximum-paths', 'ibgp'], max_ibgp )
+        config.delete(max_path)
+
+try:
+    with open(file_name, 'w') as f:
+        f.write(config.to_string())
+except OSError as e:
+    print("Failed to save the modified config: {}".format(e))
+    sys.exit(1)