Gordian applies transformations to files in github repositories and create PRs for the owners of the repositories to review and merge them.
This project grew from a need to keep various kubernetes services consistent and roll out changes at scale. The main use case for this tool is to make changes to configuration files across multiple repositories simultaneously.
You can use the docker image to search and replace various strings across repositories. It supports simple and complex search/replace strings operations.
docker run --rm -it argoprojlabs/gordian:latest -h
usage: gordian [-h] [-c CONFIG_FILE] [-g GITHUB_API] --pr PR_MESSAGE [-v] [-d]
[-b BRANCH] [-t TARGET_BRANCH] [-l PR_LABELS [PR_LABELS ...]]
[-M | -m | -p]
[--description DESCRIPTION | --description-file DESCRIPTION_FILE]
[--force-changelog FORCE_CHANGELOG] -s SEARCH -r REPLACE
optional arguments:
-h, --help show this help message and exit
-c CONFIG_FILE, --config CONFIG_FILE
Config file path. (default: config.yaml)
-g GITHUB_API, --github-api GITHUB_API
Github API URL (default: None)
--pr PR_MESSAGE Pull request name. (default: None)
-v, --verbose
-d, --dry-run Enable dry run mode (default: False)
-b BRANCH, --branch BRANCH
Branch name to use (default: None)
-t TARGET_BRANCH, --target-branch TARGET_BRANCH
Target branch (default: master)
-l PR_LABELS [PR_LABELS ...], --labels PR_LABELS [PR_LABELS ...]
List of space separated label names you wish to add to
your pull request(s) (default: [])
-F FILE, --file FILE
File to change, currently only supported with
PlainTextUpdater. (default: None)
-M, --major Bump the major version. (default: None)
-m, --minor Bump the minor version. (default: None)
-p, --patch Bump the patch version. (default: None)
--description DESCRIPTION
Description to be passed to the PR. (default: )
--description-file DESCRIPTION_FILE
Local file path for the description to be passed to
the PR. (default: None)
--force-changelog FORCE_CHANGELOG
Fail if changelog does not exist or cannot be parsed
(default: None)
-s SEARCH, --search SEARCH
The string to search for in config files. (default:
None)
-r REPLACE, --replace REPLACE
The string that will replace instances of the searched
string. (default: None)
You can use the command line interface to make simple changes across various JSON and YAML files, as shown in this example that modifies a kubernetes API Version.
The following command will update the repositories listed in the default config file config.yaml by making a new pull request to the target master branch
using a new origin branch update_k8s_apiversion by updating all files that contains apiVersion: apps/v1beta2 to replace it with apiVersion: apps/v1.
The new PR will have the labels k8s.1.16 and support assigned to it and the minor version will be bumped.
docker run --rm -it argoprojlabs/gordian:latest -b "update_k8s_apiversion" --pr "update_k8s_apiversion" -s "apiVersion: apps/v1beta2" -r "apiVersion: apps/v1" -l k8s.1.16 -v -mYou can use the python script interface to make complex changes across various JSON and YAML files, as shown in this example that modifies a kubernetes resource. You can see more examples in the examples directory.
import sys
from gordian.gordian import get_basic_parser, apply_transformations
from gordian.transformations import Transformation
class PreScale(Transformation):
def __init__(self, args, repo):
super().__init__(args, repo)
self.environments = args.environments
def run(self):
for env in self.environments:
objects = self.repo.get_objects(f'overlays/{env}/envconfig-values.yaml')
min_replicas = None
for obj in objects:
if obj['kind'] != 'HorizontalPodAutoscaler':
continue
if obj['spec']['minReplicas'] != obj['spec']['maxReplicas']:
min_replicas = obj['spec']['minReplicas']
obj['spec']['maxReplicas'] = min_replicas
if min_replicas is not None:
objects.save(f'Setting maxRelicas = minReplicas = {min_replicas}', self.dry_run)
self.repo.changelog.added('Set max replicas equal to min replicas', 'TICKET-1234')
self.repo.changelog.save('Update changelog', self.dry_run)
if __name__ == '__main__':
parser = get_basic_parser()
parser.add_argument(
'-e', '--environments',
required=False,
dest='environments',
default=['prd'],
action='append',
help='Environments to update.'
)
args = parser.parse_args(sys.argv[1:])
apply_transformations(args, [PreScale])config.yaml(required) - list of repositories you wish to modifyGIT_USERNAME(optional) - your Github usernameGIT_PASSWORD(optional) - your Github password or Personal Access TokenGIT_TOKEN(optional) - Github Personal Access Token that grants write access to the specified repositories
Two methods of authentication are available:
- Using a Personal Access Token
- Using a Github Username & Password
A Github Personal Access Token, Github Username and Github Password can also be passed in via the token=, username= and password= named parameters. The passed value will always take precedence over any environment variable. (Added in 3.5.0)
A Personal Access Token can be used in two ways:
- Setting the
GIT_TOKENenvironment variable - Passing the
token=named parameter
The Personal Access Token must have write access to any specified repositories you wish to submit changes to.
A Github Username and Password combination can be used in two ways:
- Setting the
GIT_USERNAMEandGIT_PASSWORDenvironment variables - Passing the
username=andpassword=parameters
The user must have write access to any specified repositories you wish to submit changes to.
The GIT_PASSWORD or password= may also contain a Personal Access Token instead of the account password.
The simplest way to hit the ground running if you want to contribute with code is using docker.
Launch a python container
localhost$ docker run --rm -it -v $(pwd):$(pwd) -w $(pwd) python:3.11-slim-bullseye bashInstall the project and test dependencies in developer mode
container# pip install -e .[test]Run the tests
container# pytest
=========================================== test session starts ============================================
platform linux -- Python 3.7.1, pytest-4.5.0, py-1.8.0, pluggy-0.11.0
rootdir: /Users/user/git/argoproj-labs
plugins: requests-mock-1.6.0, cov-2.7.1
collected 33 items
....
================================== 33 passed, 2 warnings in 1.73 seconds ===================================
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