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#!/usr/bin/env python3
import argparse
from concurrent import futures
import pathlib
import shlex
import shutil
import subprocess
import textwrap
import yaml
"""
This script performs Puppet catalog compilation without a central server.
It receives the following arguments:
* directory: a working directory. The script expects to find some data, like
variables to use in the compilation process, facts, etc. The script also
generates intermediate files and output there.
* modulepath: path to your modules directory
* manifest: path to your site directory
* host: the hosts to compile catalogs to
The script expects the following content on the working directory:
directory/
global_vars/*.json: these JSON files will be available to all hosts
host_vars/{host}/*.json: these JSON files will be available in each host
facts/{host}.json: output from "facter -y" for each host
And produces the following files:
directory/
output/
{host}/
catalog.json: the compiled catalog for the host
modules: a copy of the module directory
Just ship the {host} directory to each host and run:
$ puppet apply --catalog .../catalog.json --modulepath=.../modules/
Check the apply_catalog Ansible role for example usage.
As we have the catalogs, we can manipulate them. See
pseudo_resource_exporter.py for an example hack. We can simulate exported
resources without PuppetDB.
"""
def build_hiera(directory, build_host_dir, host):
hiera_data_dir = build_host_dir / "data"
hiera_data_dir.mkdir()
hiera = {
"version": 5,
"hierarchy": []
}
global_vars_dir = directory / "global_vars"
for global_var in global_vars_dir.glob("*.json"):
shutil.copy(global_var, hiera_data_dir / global_var.name)
hiera["hierarchy"].append({
"name": global_var.name.removesuffix(".json"),
"path": global_var.name,
"data_hash": "json_data",
})
host_vars_dir = directory / "host_vars" / host
for host_var in host_vars_dir.glob("*.json"):
shutil.copy(host_var, hiera_data_dir / host_var.name)
hiera["hierarchy"].append({
"name": host_var.name.removesuffix(".json"),
"path": host_var.name,
"data_hash": "json_data",
})
hiera_path = build_host_dir / "hiera.yaml"
with open(hiera_path, "w") as f:
yaml.dump(hiera, f)
return hiera_path
def build_facts(directory, build_host_dir, host):
source_facts_dir = directory / "facts"
with open(source_facts_dir / f"{host}.yaml") as f:
facts_yaml_content = f.read()
dest_facts_dir = build_host_dir / "yaml" / "facts"
dest_facts_dir.mkdir(parents=True)
with open(dest_facts_dir / f"{host}.yaml", "w") as f:
f.write("--- !ruby/object:Puppet::Node::Facts\nvalues:\n")
f.write(textwrap.indent(facts_yaml_content, " "))
def compile_catalog(directory, build_dir, modulepath, manifest, output_dir,
host):
build_host_dir = build_dir / host
build_host_dir.mkdir()
hiera_path = build_hiera(directory, build_host_dir, host)
build_facts(directory, build_host_dir, host)
cmd = [
"puppet", "catalog", "compile",
f"--modulepath={modulepath}",
f"--hiera_config={hiera_path}",
f"--manifest={manifest}",
"--terminus", "compiler",
"--vardir", build_host_dir,
"--facts_terminus", "yaml",
host
]
print(shlex.join(map(str, cmd)))
catalog_compile = subprocess.run(
cmd, check=True,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
encoding="utf8"
)
assert not catalog_compile.stderr, catalog_compile.stderr
catalog_stdout = catalog_compile.stdout
_, catalog = catalog_stdout.split("\n", 1)
host_output_dir = output_dir / host
host_output_dir.mkdir()
with open(host_output_dir / "catalog.json", "w") as f:
f.write(catalog)
shutil.copytree(modulepath, host_output_dir / "modules")
def up(directory: pathlib.Path, modulepath, manifest, hosts: list[str]):
build_dir = directory / "build"
build_dir.mkdir()
output_dir = build_dir / "output"
output_dir.mkdir()
def _compile_catalog(host):
compile_catalog(
directory=directory,
build_dir=build_dir,
modulepath=modulepath,
manifest=manifest,
output_dir=output_dir,
host=host)
# list because exceptions do not happen unless you iterate over the result
list(futures.ThreadPoolExecutor().map(_compile_catalog, hosts))
def main():
parser = argparse.ArgumentParser()
parser.add_argument("directory")
parser.add_argument("modulepath")
parser.add_argument("manifest")
parser.add_argument("hosts", nargs="+", metavar="host")
args = parser.parse_args()
up(
directory=pathlib.Path(args.directory),
modulepath=args.modulepath,
manifest=args.manifest,
hosts=args.hosts
)
if __name__ == "__main__":
main()
|
