add_roles.py

#!/usr/bin/env python3
 
 from os import listdir
 from os import path
 import yaml
 
 role = 'logs'
 
 base_dir = '/var/cache/salt/master/minions'
 minions_dirs = listdir(base_dir)
 
 for dir in minions_dirs:
     grain_file = base_dir + '/' + dir + '/files/etc/salt/grains'
     if path.isfile(grain_file):
         with open(grain_file, 'r') as infile:
             grains = yaml.load(infile)
         grains['roles'].append(role)
         with open(grain_file, 'w') as outfile:
             yaml.dump(grains, outfile, default_flow_style=False)
     else:
         print("%s does not exist") % (grain_file)

random_salt_hacks.sh

# return comma separated list of some minions, good for creating host lists
salt -C 'G@location:asd and G@kernel:windows' test.ping | grep -v True | sed 's/:/,/g' | sed ':a;N;$!ba;s/\n/ /g'

# copy edited grains files from master to respective minion
find ./ -mindepth 1 -maxdepth 1 -type d | while read line ; do echo $line | salt-cp "`pcregrep -o1 --color '\./(.+)'`" $line/files/etc/salt/grains /etc/salt/grains ; done