cmueller/ansible
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Add /proc/cmdline information to the default facts

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The use-case here is that based on information in the /proc/cmdline certain actions can be taken.

A practical example in our case is that we have a play at the end of the provisioning phase that reboots the system. Since we don't want to accidentally reboot a system (or restart the network) on a production machine, having a way to separate an Anaconda post-install (sshd in chroot) with a normal system is a good way to make that distinction.

    ---
    - name: reboot
      hosts: all
      tasks:
      - action: command init 6
        only_if: "not '${ansible_cmdline.BOOT_IMAGE}'.startswith('$')"

A practical problem here is the fact that we cannot simply check whether it is set or empty:

    ---
    - name: reboot
      hosts: all
      tasks:
      - action: command init 6
        only_if: "'${ansible_cmdline.BOOT_IMAGE}'"

If ansible_cmdline was a string, a simple only_if: "'${ansible_cmdline}'.find(' BOOT_IMAGE=')" was an option, but still not very "beautiful" :-/

This implementation uses shlex.split() and uses split(sep, maxsplit=1).
This commit is contained in:
Dag Wieers 2012-09-05 18:26:47 +02:00
parent 4223442992
commit cabbb9fce7
1 changed files with 13 additions and 1 deletions
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14
setup
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@ -58,6 +58,7 @@ class Facts(object):
self.facts = {}
self.get_platform_facts()
self.get_distribution_facts()
self.get_cmdline()
self.get_public_ssh_host_keys()
self.get_selinux_facts()
@ -103,6 +104,17 @@ class Facts(object):
else:
self.facts['distribution'] = name
def get_cmdline(self):
data = get_file_content('/proc/cmdline')
if data:
self.facts['cmdline'] = {}
for piece in shlex.split(data):
item = piece.split('=', 1)
if len(item) == 1:
self.facts['cmdline'][item[0]] = True
else:
self.facts['cmdline'][item[0]] = item[1]
def get_public_ssh_host_keys(self):
dsa = get_file_content('/etc/ssh/ssh_host_dsa_key.pub')
rsa = get_file_content('/etc/ssh/ssh_host_rsa_key.pub')
@ -198,7 +210,7 @@ class LinuxHardware(Hardware):
MEMORY_FACTS = ['MemTotal', 'SwapTotal', 'MemFree', 'SwapFree']
# DMI bits
DMI_DICT = dict(
form_factor = '/sys/devices/virtual/dmi/id/chassis_type',
form_factor = '/sys/devices/virtual/dmi/id/chassis_type',
product_name = '/sys/devices/virtual/dmi/id/product_name',
product_serial = '/sys/devices/virtual/dmi/id/product_serial',
product_uuid = '/sys/devices/virtual/dmi/id/product_uuid',