Merge "config/utils: Add generate_config.py"

diff --git a/config/utils/generate_config.py b/config/utils/generate_config.py
new file mode 100755 (executable)
index 0000000..a32367a
--- /dev/null
+++ b/config/utils/generate_config.py
@@ -0,0 +1,53 @@
+#!/usr/bin/python
+"""This module does blah blah."""
+import argparse
+import ipaddress
+import yaml
+from jinja2 import Environment, FileSystemLoader
+
+PARSER = argparse.ArgumentParser()
+PARSER.add_argument("--yaml", "-y", type=str, required=True)
+PARSER.add_argument("--jinja2", "-j", type=str, required=True)
+ARGS = PARSER.parse_args()
+
+# Processor architecture vs DPKG architecture mapping
+DPKG_ARCH_TABLE = {
+    'aarch64': 'arm64',
+    'x86_64': 'amd64',
+}
+ARCH_DPKG_TABLE = dict(zip(DPKG_ARCH_TABLE.values(), DPKG_ARCH_TABLE.keys()))
+
+# Custom filter to allow simple IP address operations returning
+# a new address from an upper or lower (negative) index
+def ipaddr_index(base_address, index):
+    """Return IP address in given network at given index"""
+    try:
+        base_address_str = unicode(base_address)
+    #pylint: disable=unused-variable
+    except NameError as ex:
+        base_address_str = str(base_address)
+    return ipaddress.ip_address(base_address_str) + int(index)
+
+# Custom filter to convert between processor architecture
+# (as reported by $(uname -m)) and DPKG-style architecture
+def dpkg_arch(arch, to_dpkg=True):
+    """Return DPKG-compatible from processor arch and vice-versa"""
+    if to_dpkg:
+        return DPKG_ARCH_TABLE[arch]
+    else:
+        return ARCH_DPKG_TABLE[arch]
+
+ENV = Environment(loader=FileSystemLoader('./'))
+ENV.filters['ipaddr_index'] = ipaddr_index
+ENV.filters['dpkg_arch'] = dpkg_arch
+
+with open(ARGS.yaml) as _:
+    DICT = yaml.safe_load(_)
+
+# Print dictionary generated from yaml (uncomment for debug)
+# print(DICT)
+
+# Render template and print generated conf to console
+TEMPLATE = ENV.get_template(ARGS.jinja2)
+#pylint: disable=superfluous-parens
+print(TEMPLATE.render(conf=DICT))