pynvramutil

pynvramutil is a utility for nvram change management

Src: https://github.com/westurner/pynvramutil

Docs: https://github.com/westurner/pynvramutil#pynvramutil

• Free software: ISC license

Features

• [X] Parse the (unsorted multiline) output from nvram show and sort by key name
• [ ] Compare two nvram show outputs (e.g. for incremental changesets)
• [ ] Generate a series of nvram set commands from a changeset

nvram show

Config data stored in nonvolatile RAM (nvram) with many DD-WRT and OpenWRT compatible devices can be listed with the nvram utility included with a given image.

For example, the output from nvram show:

# nvram show
ssh user@host -- nvram show | tee nvramshow.output.txt

key1=value1
key2=value
two
2
key3=value3

Use Cases

Firmware Upgrade Config Rebuild

Problem: When upgrading [many different] embedded device firmwares, it's often recommended to factory reset the configuration (before and/or after each upgrade/downgrade); thus dropping any manual configuration.

Solution:

• [ ] Take nvram show snapshots before and between each (Web UI) change
• [ ] Build sequenced diff scripts from the changesets between each snapshot
• [ ] Manually prune/trim
• [ ] Apply one or more changeset diffs in sequence, pausing to run a test script
  • [ ] Test script (online, pingable, ssh-able, web-able)

Credits

Tools used in rendering this package:

Cookiecutter

• Cookiecutter
• cookiecutter-pypackage

DD-WRT

Wikipedia: https://en.wikipedia.org/wiki/DD-WRT

Homepage: https://www.dd-wrt.com/site/

Download: ftp://ftp.dd-wrt.com/betas/

Src: http://svn.dd-wrt.com/browser

Project: http://svn.dd-wrt.com/

Docs: https://www.dd-wrt.com/wiki

Docs: http://svn.dd-wrt.com/timeline

• DD-WRT ``nvram show`