SNB - Shake N' Bake Interactive Template Filler

Somewhere between manually typing everything and full automation exists the realm of the quick and the dirty. Getting the job done so you can go have a nice family dinner. If you just need to fill out a Jinja2 template real fast and all you have is a keyboard, snb might be for you.

Invented to avoid asking other admins to edit a fiddly text config file by hand, and to avoid needing a full blown config management system online when all you really need to do is punch out 14 spots in a static template then paste it into a serial console.

REQUIREMENTS

• Python 3.
• Some sort of OS. Probably Linux or BSD would be good.
• Courage.

INSTALLATION

Funny. Just run snb. Or run python3 snb. Ok, here is how to install it if you must know:

sudo cp snb /usr/local/bin
sudo chmod 755 /usr/local/bin/snb

USAGE

Takes Jinja2 template as STDIN, asks the user to enter anything it needs to fill out, then kicks out a filled out template on STDOUT.

Let's say you had a file named "shake.conf" that looked like this:

conf term
hostname {{ sitename }}wan

int gi0/0.10
desc DATA-VL10
enc dot1q 10
ip address 10.{{ sitenumber }}.10.1 255.255.255.0

int gi0/0.20
desc VOICE-VL20
enc dot1q 20
ip address 10.{{ sitenumber }}.20.1 255.255.255.0

int gi1/0
desc WAN
ip address {{ wan_ip }} 255.255.255.252

ip route 0.0.0.0 0.0.0.0 {{ wan_gateway }}
end
wr mem

If you wanted to interactively turn it into a file named "baked-site-213.conf" just do:

cat shake.conf | snb > baked-site-213.conf

You would then be prompted for the following:

• sitename - A name for the site. Let's call it 'baked'
• sitenumber - Assuming some sort of simple number to site mapping. Let's say this is site 213
• wan_ip - The WAN side IP address. Let's say 192.168.14.14.
• wan_gateway - The WAN gateway IP. Let's say 192.168.14.13.

The resulting output would be:

conf term
hostname bakedwan

int gi0/0.10
desc DATA-VL10
enc dot1q 10
ip address 10.213.10.1 255.255.255.0

int gi0/0.20
desc VOICE-VL20
enc dot1q 20
ip address 10.213.20.1 255.255.255.0

int gi1/0
desc WAN
ip address 192.168.14.14 255.255.255.252

ip route 0.0.0.0 0.0.0.0 192.168.14.13
end
wr mem

Stupid simple, huh?

There is one "feature" - A password hasher. If your template variable ends in "pass_ALGORITHM" the input will be fed through UNIX crypt using the given hash algorithm. Supported types are:

• sha512 - SHA512 for fresh BSD and Linux
• md5 - MD5 for JUNOS type 1

Example (from a JUNOS setup):

set system root-authentication encrypted-password "{{ root_pass_md5 }}"

When fed through, after entering your root_password value, might produce:

set system root-authentication encrypted-password "$1$v3bf1pyb$tFtHxtlz4VVG9G2CcJ74C0"

DISCLAIMER

This product is not endorsed by KRAFT, makers of Shake 'N Bake, nor by Sony Pictures, distributors of Talladega Nights. Heck, I barely endorse it.

Also, this README is longer than the script. So there is that.