README.md: document config file
Still pretty sparse, but as this bit is necessary to actually use pi-gen, here it is.
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README.md
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README.md
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#Dependencies
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`quilt kpartx realpath qemu-user-static debootstrap zerofree pxz`
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#Config
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Environment and other variables may be provided in a file named `config` in
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your current working directory when you run `build.sh`. At the moment, the
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only thing you must configure is the name of the image to create. Something
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like this is used for Raspbian:
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```bash
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IMG_NAME='Raspbian'
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```
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Obviously if you are making changes to the pi-gen stages you should probably
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use a different `IMG_NAME` to avoid confusion.
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You can also define `APT_PROXY` here if you need to.
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