README.md: document config file

Still pretty sparse, but as this bit is necessary to actually use
pi-gen, here it is.
pull/10/head
T. Joseph Carter 2016-09-02 07:37:55 -07:00
parent fa88d07848
commit 3c1ea79323
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#Dependencies
`quilt kpartx realpath qemu-user-static debootstrap zerofree pxz`
#Config
Environment and other variables may be provided in a file named `config` in
your current working directory when you run `build.sh`. At the moment, the
only thing you must configure is the name of the image to create. Something
like this is used for Raspbian:
```bash
IMG_NAME='Raspbian'
```
Obviously if you are making changes to the pi-gen stages you should probably
use a different `IMG_NAME` to avoid confusion.
You can also define `APT_PROXY` here if you need to.