Skip to main content

Hammurabi is an extensible CLI tool responsible for enforcing user-defined rules on a git repository.

Project description

PyPi Package Build Status Documentation Status Maintainability Test Coverage Black Formatted CII Best Practices

Mass changes made easy.

Hammurabi is an extensible CLI tool responsible for enforcing user-defined rules on a git repository.


Hammurabi integrates well with both git and Github to make sure that the execution happens on a separate branch and the committed changes are pushed to the target repository. After pushing to the target repository, a pull request will be opened.

Hammurabi supports several operations (Rules) by default. These Rules can do

  • file and directory operations like copy, move, create or delete
  • manipulation of attributes like ownership or access permissions change
  • file and directory manipulations
  • piped rule execution (output of a rule is the input of the next rule)
  • children rule execution (output of a rule is the input of the upcoming rules)
  • creating files from Jinja2 templates
  • send notification on git push

Supported file formats:

  • plain text
  • ini
  • json
  • yaml (basic, single document operations)
  • toml

Upcoming file format support:

  • hocon


If you need help or you would like to be part of the Hammurabi community, join us on discord.


Hammurabi can be installed by running pip install hammurabi and it requires Python 3.7.0+ to run. This is the preferred method to install Hammurabi, as it will always install the most recent stable release. If you don’t have pip installed, this Python installation guide can guide you through the process.

Installing extras

Hammurabi tries to be as tiny as its possible, hence some rules are requiring extra dependencies to be installed. Please check the documentation of the Rules to know which dependency is required to use the specific rule.

To install hammurabi with an extra package run pip install hammurabi[<EXTRA>], where <EXTRA> is the name of the extra option. To install multiple extra packages list the extra names separated by comma as described in pip’s examples section point number six.

Extra Description
all alias to install all the extras available
ini needed for ini/cfg based rules
ujson install if you need faster json manipulat
yaml needed for yaml based rules
templating needed for rules which are using templates
slack-notifications needed for slack webhook notifications


For configuration instructions, please visit the documentation site.

Usage examples

In every case, make sure that you clone the target repository prior using Hammurabi. After cloning the repository, always set the current working directory to the target’s path. Hammurabi will not clone the target repository or change its execution directory.

Enforce registered laws

$ hammurabi enforce
[INFO]  2020-14-07 16:31 - Checkout branch "hammurabi"
[INFO]  2020-14-07 16:31 - Executing law "L001"
[INFO]  2020-14-07 16:31 - Running task for "configure file exists"
[INFO]  2020-14-07 16:31 - Rule "configure file exists" finished successfully
[INFO]  2020-14-07 16:31 - Running task for "Minimum clang version is set"
[INFO]  2020-14-07 16:31 - Rule "Minimum clang version is set" finished successfully
[INFO]  2020-14-07 16:31 - Running task for "Minimum icc version is set"
[INFO]  2020-14-07 16:31 - Rule "Minimum icc version is set" finished successfully
[INFO]  2020-14-07 16:31 - Running task for "Minimum lessc version is set"
[INFO]  2020-14-07 16:31 - Rule "Minimum lessc version is set" finished successfully
[INFO]  2020-14-07 16:31 - Running task for "Maximum lessc version is set"
[INFO]  2020-14-07 16:31 - Rule "Maximum lessc version is set" finished successfully
[INFO]  2020-14-07 16:31 - Pushing changes
[INFO]  2020-14-07 16:35 - Checking for opened pull request
[INFO]  2020-14-07 16:35 - Opening pull request

Custom Rules

Although the project aims to support as many general operations as it can, the need for adding custom rules may arise.

To extend Hammurabi with custom rules, you will need to inherit a class from Rule and define its abstract methods.

The following example will show you how to create and use a custom rule. For more reference please check how the existing rules are implemented.

import shutil
import logging
from hammurabi.mixins import GitMixin
from hammurabi.rules.base import Rule

class CustomOwnerChanged(Rule, GitMixin):
    Change the ownership of a file or directory to <original user>:admin.

    def __init__(self, name: str, path: Optional[Path] = None, **kwargs):
        super().__init__(name, path, **kwargs)

    def post_task_hook(self):

    def task(self) -> Path:
        # Since ``Rule`` is setting its 2nd parameter to ``self.param``,
        # we can use ``self.param`` to access the target file's path.
        logging.debug('Changing group of "%s" to admin', str(self.param))
        shutil.chown(self.param, group="admin")
        return self.param

Custom Preconditions

Rule execution supports preconditions. The logic is simple: if all preconditions pass, the rule is executed. Otherwise it will be skipped.

from hammurabi import IsLineExists

class IsPackage(IsLineExists):
    def __init__(self, **kwargs):
        super().__init__(path=Path("Jenkinsfile"), criteria="package", **kwargs)

Command line options

Usage: hammurabi [OPTIONS] COMMAND [ARGS]...

Hammurabi is an extensible CLI tool responsible for enforcing user-defined
rules on a git repository.

Find more information at:

-c, --config PATH               Set the configuration file.  [default:

--repository TEXT               Set the remote repository. Required format:
                                owner/repository.  [default: ]

--token TEXT                    Set github access token.  [default: ]
                                Set logging level.  [default: INFO]
--install-completion [bash|zsh|fish|powershell|pwsh]
                                Install completion for the specified shell.
--show-completion [bash|zsh|fish|powershell|pwsh]
                                Show completion for the specified shell, to
                                copy it or customize the installation.

--help                          Show this message and exit.

enforce  Execute registered laws.
version  Print hammurabi version.


Hurray, You reached this section, which means you are ready to contribute.

Please read our contibuting guideline. This guideline will walk you through how can you successfully contribute to Hammurabi.


For development you will need poetry and pre-commit. After poetry installed, simply run poetry install -E all. This command will both create the virtualenv and install all development dependencies for you.

Useful make Commands

Command Description
help Print available make commands
clean Remove all artifacts
clean-build Remove build artifacts
clean-mypy Remove mypy artifacts
clean-pyc Remove Python artifacts
clean-test Remove test artifacts
docs Generate Sphinx documentation
format Run several formatters
lint Run several linters after format
test Run all tests with coverage
test-unit Run unit tests with coverage
test-integration Run integration tests with coverage

Why Hammurabi?

Hammurabi was the sixth king in the Babylonian dynasty, which ruled in central Mesopotamia from c. 1894 to 1595 B.C.

The Code of Hammurabi was one of the earliest and most complete written legal codes and was proclaimed by the Babylonian king Hammurabi, who reigned from 1792 to 1750 B.C. Hammurabi expanded the city-state of Babylon along the Euphrates River to unite all of southern Mesopotamia. The Hammurabi code of laws, a collection of 282 rules, established standards for commercial interactions and set fines and punishments to meet the requirements of justice. Hammurabi’s Code was carved onto a massive, finger-shaped black stone stele (pillar) that was looted by invaders and finally rediscovered in 1901.

Project details

Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Source Distribution

hammurabi-0.11.1.tar.gz (48.6 kB view hashes)

Uploaded source

Built Distribution

hammurabi-0.11.1-py3-none-any.whl (64.5 kB view hashes)

Uploaded py3

Supported by

AWS AWS Cloud computing Datadog Datadog Monitoring Facebook / Instagram Facebook / Instagram PSF Sponsor Fastly Fastly CDN Google Google Object Storage and Download Analytics Huawei Huawei PSF Sponsor Microsoft Microsoft PSF Sponsor NVIDIA NVIDIA PSF Sponsor Pingdom Pingdom Monitoring Salesforce Salesforce PSF Sponsor Sentry Sentry Error logging StatusPage StatusPage Status page