This is part of a series of posts on ideas for an ansible-like provisioning system, implemented in Transilience.
I added check mode to Transilience, to do everything except perform changes, like Ansible does:
$ ./provision --help
usage: provision [-h] [-v] [--debug] [-C] [--to-python role]
Provision my VPS
optional arguments:
-h, --help show this help message and exit
-v, --verbose verbose output
--debug verbose output
-C, --check do not perform changes, but check if changes would be ← NEW!
needed ← NEW!
It was quite straightforwad to add a new field to the base Action class, and
tweak the implementations not to perform changes if it is True:
# Shortcut function to annotate dataclass fields with documentation metadata
def doc(default: Any, doc: str, **kw):
return field(default=default, metadata={"doc": doc})
@dataclass
class Action:
...
check: bool = doc(False, "when True, check if the action would perform changes, but do nothing")
Like with Ansible, check mode takes about the same time as a normal run which does not perform changes.
Unlike Ansible, with Transilience this is actually pretty fast! ;)
Next step: parsing YAML!