Hello,
In order to make a command task idempotence, I want to check a file
exists by using "only_if" something like this
- name: do something
command: do_something.sh
only_if: not os.path.exists("result.file")
I know make one more task and use "register" can realize this, but I
want to keep a playbook simple.
Is there a way to evaluate more programmable expression at the "only_if" ?
Regards,
WAKAYAMA Shirou
What you want is already built into the command module. See the "creates"
option.
http://ansible.cc/docs/modules.html#command
So your call would look like this:
- name: do something
command: do_something.sh creates=/path/to/result.file
This cause the command to be skipped if the file is present.
So “only_if” is the old way do conditionals, we have “when:” in 1.2 (the “when_integer” and so on were a stopgap in 1.1).
Anyway, it executes locally, not remotely.
It seems like you can benefit from the “creates=” and “removes=” parameters to the command and shell modules for what you want to do as long as it involves file existence/absence.
Hello,
What you want is already built into the command module. See the "creates" option.
- name: do something
command: do_something.sh creates=/path/to/result.file
Thank you, it works!
But, these "creates" and "removes" are little misunderstanding names I think.
How about "if_exists" and "not_exists" ?
Regards,
Shirou
Not going to change them.