added /etc/network/interfaces generator initial version

src/generate_default_network_interfaces.py

+#!/usr/bin/env python
+
+from __future__ import division
+from __future__ import print_function
+
+'''
+/**
+ * @file generate_default_network_interfaces.py
+ * @brief - Generate the default /etc/network/interfaces file
+ *          based on the Elphel's Poky config: poky/build/conf/local.conf
+ *          which contains ip address (and network mask)
+ *        - Install into rootfs
+ * @copyright Copyright (C) 2018 Elphel Inc.
+ * @author Oleg Dzhimiev <oleg@elphel.com>
+ * @deffield updated: unknown
+ *
+ * @par <b>License</b>:
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  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/>.
+*/
+'''
+
+__copyright__ = "Copyright (C) 2018 Elphel, Inc."
+__license__ = "GPL-3.0+"
+__maintainer__ = "Oleg Dzhimiev"
+__email__ = "oleg@elphel.com"
+
+import os
+
+path = "generated"
+filepath = os.path.join(path,"interfaces")
+
+# in python 3 it's a single line:
+#     os.makedirs(path, exist_ok=True)
+try:
+  os.makedirs(path)
+except OSError:
+  if not os.path.isdir(path):
+    raise
+
+ip      = "192.168.0.9"
+mask    = "255.255.255.0"
+gateway = "192.168.0.15"
+
+with open(filepath,"w") as f:
+    f.write("""\
+# This is an auto-generated file created by a script that is run from
+# Elphel's Yocto Poky framework setup.
+#
+# See
+#   project: https://git.elphel.com/Elphel/elphel-init
+#   file   : src/generate_default_network_interfaces.py
+#
+
+# /etc/network/interfaces -- configuration file for ifup(8), ifdown(8)
+
+auto lo
+iface lo inet loopback
+
+auto eth0
+iface eth0 inet static
+    address {0}
+    netmask {1}
+    gateway {2}
+""".format(ip,mask,gateway))
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