node-sh-vars

#!/bin/bash
#
# This script was written for any Crowbar hacker who gets fed up of
# copying and pasting Chef node and role names when using knife!
# It outputs some shell code setting easy-to-type variables for the
# nodes and roles in the Crowbar cluster, where the variables being set
# are an abbreviated version of the aliases, with an 'r' suffix for the
# corresponding roles.  For example, if you have nodes aliased 'node1',
# 'node2', and 'node3', you'll get something like:
#
#   n1=d52-54-00-b5-4c-c6.cloud.site           # node name for node1
#   n2=d52-54-00-e5-6b-a0.cloud.site           # node name for node2
#   n3=d52-54-00-03-fb-01.cloud.site           # node name for node3
#   n1r=crowbar-d52-54-00-b5-4c-c6_cloud_site  # role name for node1
#   n2r=crowbar-d52-54-00-e5-6b-a0_cloud_site  # role name for node2
#   n3r=crowbar-d52-54-00-03-fb-01_cloud_site  # role name for node3
#
# Recommended installation:
#
#   Copy to your admin node somewhere in its $PATH
#
# Example usage from admin node:
#
#   eval "$( /path/to/this/script )"
#   knife node show $n1
#   knife role show $n1r
#
# Example usage from outside admin node:
#
#   eval "$( ssh root@192.168.124.10 /path/to/this/script )"
#   ssh root@192.168.124.10 knife node show $n1
#   ssh root@192.168.124.10 knife role show $n1r
#
# And of course you can cache the result, to quickly reuse across multiple shells:
#
#   ssh root@192.168.124.10 /path/to/this/script > /tmp/.crowbar-nodes-roles.cache
#   source /tmp/.crowbar-nodes-roles.cache

for machine in $( crowbar machines list ); do
    [ "$machine" = $( hostname -f ) ] && continue
    alias=$( crowbar machines show "$machine" | sed -n '/^ *"alias": "\(.\+\)",\?/{s//\1/;p}' )
    short="${alias/node/n}"
    short="${short//-/}"
    echo "$short=$machine # node name for $alias"
    role="crowbar-${machine//./_}"
    echo "${short}r=$role # role name for $alias"
done | \
sort -k3 -k1 | \
column -t | \
sed 's/\([^ ]\)  \([^ #]\)/\1 \2/g'