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README.md: Describe more config variables, cleanup

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Added some documentation of environment variables to README.md,
specifically WORK_DIR and DEPLOY_DIR.  Explicitly did not include
SCRIPT_DIR at this time because that appears to require some small work
before it can be changed.

Took the chance for some other syntax cleanups while I was at it, mostly
breaking long lines and inserting whitespace where some Markdown parsers
require it.
This commit is contained in:
T. Joseph Carter 2017-05-06 16:16:00 -07:00 committed by XECDesign
parent 0ee2578bc6
commit d729fc2dbb
1 changed files with 57 additions and 9 deletions
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README.md
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@ -1,12 +1,24 @@
# pi-gen # pi-gen
_Tool used to create the raspberrypi.org Raspbian images_ _Tool used to create the raspberrypi.org Raspbian images_
### TODO ### TODO
1. Documentation 1. Documentation
## Dependencies ## Dependencies
`quilt parted realpath qemu-user-static debootstrap zerofree pxz zip dosfstools bsdtar libcap2-bin grep rsync` On Debian-based systems:
```bash
apt-get install quilt parted realpath qemu-user-static debootstrap zerofree pxz zip \
dosfstools bsdtar libcap2-bin grep rsync
```
The file `depends` contains a list of tools needed. The format of this
package is `<tool>[:<debian-package>]`.
## Config ## Config
@ -29,29 +41,57 @@ The following environment variables are supported:
will not be included in the image, making it safe to use an `apt-cacher` or will not be included in the image, making it safe to use an `apt-cacher` or
similar package for development. similar package for development.
* `BASE_DIR` (Default: location of `build.sh`)
**CAUTION**: Currently, changing this value will probably break build.sh
Top-level directory for `pi-gen`. Contains stage directories, build
scripts, and by default both work and deployment directories.
* `WORK_DIR` (Default: `"$BASE_DIR/work"`)
Directory in which `pi-gen` builds the target system. This value can be
changed if you have a suitably large, fast storage location for stages to
be built and cached. Note, `WORK_DIR` stores a complete copy of the target
system for each build stage, amounting to tens of gigabytes in the case of
Raspbian.
* `DEPLOY_DIR` (Default: `"$BASE_DIR/deploy"`)
Output directory for target system images and NOOBS bundles.
A simple example for building Raspbian: A simple example for building Raspbian:
```bash ```bash
IMG_NAME='Raspbian' IMG_NAME='Raspbian'
``` ```
## Docker Build ## Docker Build
```bash ```bash
vi config # Edit your config file. See above. vi config # Edit your config file. See above.
./build-docker.sh ./build-docker.sh
``` ```
If everything goes well, your finished image will be in the `deploy/` folder. If everything goes well, your finished image will be in the `deploy/` folder.
You can then remove the build container with `docker rm pigen_work` You can then remove the build container with `docker rm pigen_work`
If something breaks along the line, you can edit the corresponding scripts, and If something breaks along the line, you can edit the corresponding scripts, and
continue: continue:
``` ```bash
CONTINUE=1 ./build-docker.sh CONTINUE=1 ./build-docker.sh
``` ```
There is a possibility that even when running from a docker container, the installation of `qemu-user-static` will silently fail when building the image because `binfmt-support` _must be enabled on the underlying kernel_. An easy fix is to ensure `binfmt-support` is installed on the host machine before starting the `./build-docker.sh` script (or using your own docker build solution). There is a possibility that even when running from a docker container, the
installation of `qemu-user-static` will silently fail when building the image
because `binfmt-support` _must be enabled on the underlying kernel_. An easy
fix is to ensure `binfmt-support` is installed on the host machine before
starting the `./build-docker.sh` script (or using your own docker build
solution).
## Stage Anatomy ## Stage Anatomy
@ -104,14 +144,22 @@ maintenance and allows for more easy customization.
the stage that installs all of the things that make Raspbian friendly to the stage that installs all of the things that make Raspbian friendly to
new users. new users.
### Stage specification ### Stage specification
If you wish to build up to a specified stage (such as building up to stage 2 for a lite system), place an empty file named `SKIP` in each of the `./stage` directories you wish not to include.
Then remove the `EXPORT*` files from `./stage4` (if building up to stage 2) or from `./stage2` (if building a minimal system). If you wish to build up to a specified stage (such as building up to stage 2
for a lite system), place an empty file named `SKIP` in each of the `./stage`
directories you wish not to include.
``` Then remove the `EXPORT*` files from `./stage4` (if building up to stage 2) or
from `./stage2` (if building a minimal system).
```bash
# Example for building a lite system # Example for building a lite system
$ touch ./stage3/SKIP ./stage4/SKIP touch ./stage3/SKIP ./stage4/SKIP
$ rm stage4/EXPORT* rm stage4/EXPORT*
``` ```
If you wish to build further configurations upon (for example) the lite system, you can also delete the contents of `./stage3` and `./stage4` and replace with your own contents in the same format.
If you wish to build further configurations upon (for example) the lite
system, you can also delete the contents of `./stage3` and `./stage4` and
replace with your own contents in the same format.