command on master

# passing pillar manually works
salt 'dns2*' state.sls dns.new_minion "pillar={'new_minion': 'foobar'}"

# passing via 'kwarg' key in the reactor file start.sls does not work
# on minion:
root@lb1:~# salt-call event.send 'salt/minion/lb1.phx.9999.devops.some-domain.com/start'
local:
    True

# from salt master log with DEBUG log level I see:
# new_minion = __pillar__[\'new_minion\']\nKeyError: \'new_minion\'\n'], 'retcode': 1

# If I try just echoing the entire __pillar__ to a file, it only contains my mine

new_minion.sls

#!py

def run():
    states = {}
    new_minion = __pillar__['new_minion']
    states['test-reactor-triggered-sls'] = {
        'cmd.run': [
            {'name': 'echo "{0}" > /tmp/foo'.format(new_minion)}
        ]
    }
    return states
~                    

pillar top.sls

# /srv/pillar-dev/top.sls
base:
    '*':
        - saltmine
    'salt-master.my-tss.com':
        - localhost
        - localhost.secrets
    'lb*':
        - websites
        - websites.secrets
    'web*':
        - websites
        - websites.secrets
    'cache*':
        - websites
    'elk*':
        - elk
    'db*':
        - websites
        - websites.secrets
    'git*':
        - gitlab
        - websites
    'staging*':
        - websites
        - websites.secrets
    'dns*':
        - dns

saltmine pillar

# /srv/pillar-dev/saltmine/init.sls
mine_functions:
    network.interfaces: []
    network.ip_addrs: []
    fqdn:
        - mine_function: grains.get
        - fqdn
    domain: 
        - mine_function: grains.get
        - domain

start.sls

#!py

def run():
    ret = {}

    __salt__['mine.update'](data['id'])

    ret['add-new-minion-a-record-{0}'.format(data['id'])] = {
        'local.state.sls': [
            {'tgt': 'dns*'},
            {'arg': ['dns.new_minion']},
            {'kwarg': [
                {'pillar': {
                    'new_minion': data['id']
                }}
            ]}
        ]
    }
    return ret