Check python packages from requirement.txt and report issues
Python License Checker
Check python packages listed in a requirements.txt file and report license issues.
You can define a list of authorized licenses, unauthorized licenses and authorized packages.
The tool will check the requirements.txt file, check packages and their dependencies and return an error if some packages are not compliant against the given strategy.
The tool has 3 levels of checks to select from:
- Standard (default):
A package is considered as compliant when at least one of its licenses is in the authorized license list, or if the package is in the list of authorized packages.
Same as Standard, but a package is not considered compliant when one or more of its licenses is in the unauthorized license list, even if it also has a license in the authorized license list. A package is still compliant if present in the authorized packages list.
All licenses listed for a package must be in the authorised license list for the package to be considered compliant. A package is still compliant if present in the authorized packages list.
The tool requires to be installed in the same python (virtual) environment as the packages. This, because it uses pkg_resources to access the packages resources and thus, their licenses information.
How to install
$ pip install liccheck
How to use
liccheck will read the requirements.txt and verify compliance of packages against a strategy defined in the ini file. If the requirements file is not specified on the command line, it will search for requirements.txt in the current folder. You have to setup an ini file with an authorized license list, unauthorized license list and authorized package list. The packages from your requirements.txt need to all be installed in the same python environment/virtualenv as liccheck. If the ini file is not specified on the command line, it will search for liccheck.ini in the current folder.
Here is an example of a liccheck.ini file:
# Authorized and unauthorized licenses in LOWER CASE [Licenses] authorized_licenses: bsd new bsd bsd license new bsd license simplified bsd apache apache 2.0 apache software license gnu lgpl lgpl with exceptions or zpl isc license isc license (iscl) mit mit license python software foundation license zpl 2.1 unauthorized_licenses: gpl v3 [Authorized Packages] # Python software license (see http://zesty.ca/python/uuid.README.txt) uuid: 1.30
For demo purpose, let’s say your requirements.txt file contains this:
Flask>=0.12.1 flask_restful jsonify psycopg2>=2.7.1 nose scipy scikit-learn pandas numpy argparse uuid sqlbuilder proboscis pyyaml>=3.12
The execution will output this:
$ liccheck -s my_strategy.ini -r my_project/required.txt gathering licenses...23 packages and dependencies. check forbidden packages based on licenses...none check authorized packages based on licenses...19 packages. check authorized packages...4 packages. check unknown licenses...none
If some dependencies are unknown or are not matching the strategy, the output will be something like:
$ liccheck -s my_strategy.ini -r my_project/requirements.txt gathering licenses...32 packages and dependencies. check forbidden packages based on licenses...1 forbidden packages : Unidecode (0.4.21) : GPL ['GNU General Public License v2 or later (GPLv2+)'] dependency: Unidecode << python-slugify << yoyo-migrations check authorized packages based on licenses...24 packages. check authorized packages...6 packages. check unknown licenses...1 unknown packages : feedparser (5.2.1) : UNKNOWN  dependency: feedparser
Also supports pyproject.toml like:
[project] dependencies = [ "Flask>=0.12.1", "flask_restful", "jsonify", "psycopg2>=2.7.1", "nose", "scipy", "scikit-learn", "pandas", "numpy", "argparse", "uuid", "sqlbuilder", "proboscis", "pyyaml>=3.12", ] [project.optional-dependencies] test = [ "pytest>=3.6.3", ] [tool.liccheck] authorized_licenses = [ "bsd", "new bsd", "bsd license", "new bsd license", "simplified bsd", "apache", "apache 2.0", "apache software license", "gnu lgpl", "lgpl with exceptions or zpl", "isc license", "isc license (iscl)", "mit", "mit license", "python software foundation license", "zpl 2.1", ] unauthorized_licenses = [ "gpl v3", ] # strategy_ini_file = "./liccheck.ini" # level = "STANDARD" # requirement_txt_file = "./requirements.txt" # ignored if dependencies or optional_dependencies are defined # reporting_txt_file = "path/to/reporting.txt file" # by default is None # no_deps = false dependencies = true # to load [project.dependencies] optional_dependencies = ["test"] # to load extras from [project.optional-dependencies] [tool.liccheck.authorized_packages] uuid = "1.30"
By default, exact matching is required between each package’s license and one of the license of the authorized or unauthorized list. You can also provide regular expressions to match licenses by using the as_regex boolean flag. For instance, to exclude GPL licenses, one could define the following configuration in pyproject.toml:
... unauthorized_licenses = [ '\bgpl' ] as_regex = true
Using liccheck with pre-commit
Add this to your .pre-commit-config.yaml:
- repo: https://github.com/dhatim/python-license-check rev: master hooks: - id: liccheck language: system
To run the tests:
$ tox -p all
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