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Project description

kraken-wrapper

Provides the krakenw command which is a wrapper around Kraken to construct an isolated and reproducible build environment.

Features

  • Produces isolated environments in PEX format
  • Reads build requirements from the .kraken.py file header
  • Produces lock files (.kraken.lock) that can be used to reconstruct an exact build environment 1)

1) The lock files do not contain hashes for installed distributions, but only the exact version numbers from the resolved build environment.

Requirements header

If no .kraken.lock file is present, Kraken wrapper will read the header of the .kraken.py file to obtain the requirements to install into the build environment. The format of this header is demonstrated below:

# ::requirements kraken-std>=0.3.0,<0.4.0 --extra-index-url https://...
# ::pythonpath build-support

The available options are:

  • requirements: Here you can specify any number of Pip requirements or local requirements (of the format dist-name @ path/to/dist) as well as --index-url, --extra-index-url and --interpreter-constraint.
  • pythonpath: One or more paths to add the sys.path before your build script is executed. The build-script folder is always added by default (as is the default behaviour by the kraken-core Python script project loader).

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