README.md: Improve config variable documentation (#24)
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README.md
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README.md
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@ -14,10 +14,30 @@ environment variables.
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The following environment variables are supported:
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* `IMG_NAME`, the name of the distribution to build (required)
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* `APT_PROXY`, proxy/cache URL to be included in the build
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* `MAX_STAGE`, to only run up to this stage. (default `4`, eg: `MAX_STAGE=2`)
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* `RUN_STAGE`, to only run a single stage (eg: `RUN_STAGE=1`)
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* `IMG_NAME` **required** (Default: unset)
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The name of the image to build with the current stage directories. Setting
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`IMG_NAME=Raspbian` is logical for an unmodified RPi-Distro/pi-gen build,
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but you should use something else for a customized version. Export files
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in stages may add suffixes to `IMG_NAME`.
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* `APT_PROXY` (Default: unset)
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If you require the use of an apt proxy, set it here. This proxy setting
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will not be included in the image, making it safe to use an `apt-cacher` or
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similar package for development.
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* `MAX_STAGE` (Default: unset)
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Set this to the number of the highest stage you wish to build. For
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Raspbian, `MAX_STAGE=2` will build Raspbian-lite and then stop.
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* `RUN_STAGE` (Default: unset)
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Build only a single stage. Does not build prior or subsequent stages.
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Building with e.g. `RUN_STAGE=3` requires that a build of stage2 already
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exists. *Note: Be aware that the image date affects whether or not the
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prior stages will be found!*
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A simple example for building Raspbian:
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