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containertool: Read defaults from containertool.json - #179

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amarkdotdev:containertool-config-file
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containertool: Read defaults from containertool.json#179
amarkdotdev wants to merge 1 commit into
apple:mainfrom
amarkdotdev:containertool-config-file

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@amarkdotdev

@amarkdotdev amarkdotdev commented Jul 31, 2026 •
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Summary

  • Add project-local containertool.json support so containertool can load defaults for repository, registry, base image, tag, architecture, OS, and credentials.
  • Apply precedence: CLI flags > environment variables > containertool.json > built-in defaults.
  • Discover the config file from the working directory (walking parents) and run the plugin helper from the package directory so the file is found.
  • Document the configuration file and add unit tests for loading/parsing.

Fixes #87

Test plan

  • swift build --product containertool succeeds
  • swift test --filter ConfigurationFileTests
  • Create containertool.json with "repository" and confirm containertool uses it without --repository
  • Set CONTAINERTOOL_REPOSITORY and confirm it overrides the config file
  • Pass --repository and confirm it overrides both env and config

@amarkdotdev
containertool: Read defaults from containertool.json
e2bfa34 
Allow project-local configuration file defaults for containertool
options, overridden by environment variables and CLI flags.

Fixes apple#87

Signed-off-by: amarkdotdev <amarkdotdev@users.noreply.github.com>
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containertool should read settings from a configuration file

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