Dependency Graph API

[westurner]

Dependency Graph API: an overly broad feature request meta-ticket.

Use Cases:

• Freeze requirements without installing packages
• Enumerate recursive requirements files
• Generate Dependency Documentation (DOT? NetworkX? JSON? SVG?)
• (Maybe someday) Dry Run Installs

Implementation:

• Download packages (see Make it possible to freeze requirements without installing the packages  #747)
• Read install_requires for each package
• Build a dependency graph of install_requires attributes (Specify >= or <= for vcs requirements. #728, Dependency tree with requirements.txt #753)
• Verify graph rules/constraints
• Perform topological sort of dependency graph
• Output in pip freeze format

Similar objectives:

• Make --just-print, --dry-run
• apt-get ``-s, --simulate, --just-print, --dry-run, --recon, --no-act`
• setup.py --dry-run install (http://bugs.python.org/issue8501)
• http://pypi.python.org/pypi?%3Aaction=search&term=dependency+graph&submit=search

[hltbra]

distutils2 used to have a tool like this for installed packages: http://packages.python.org/Distutils2/library/distutils2.depgraph.html

I don't know the status of that.

[westurner]

See: #1035 "Implement "hook" support for package signature verification."

[dstufft]

Closing this, I'm not 100% sure what this is asking for, but at a minimum this is either something for Warehouse or for packaging not for pip itself.

[westurner]

depresolve

• | Desc: PyPI package dependency resolution project
• | Src: https://github.com/awwad/depresolve
• | Docs: https://github.com/awwad/depresolve#depresolve
• "PERF: Scraper xmlrpclib / cached JSON"
  PERF: Scraper xmlrpclib / cached JSON awwad/depresolve#18