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121 lines
4.8 KiB
Markdown
121 lines
4.8 KiB
Markdown
# Pygos GNU/Linux
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## Overview
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This directory contains the build system for Pygos GNU/Linux, a small, heavily
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customizable operating system for embedded devices and other special purpose
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systems.
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The build system generates a compressed, read only root filesystem image, boot
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loader, kernel binary and a setup script for installing the system on the target
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board, all bundled up in a release tar ball.
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An additional disk partition or UBI volume is created for mutable configuration
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files with overlay mount points for directories like /etc or /var/lib.
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For details on the Pygos file system layout, see
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[docs/filesystem.md](docs/filesystem.md).
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An automated firmware update mechanism is currently still in development.
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For details, see [docs/update.md](docs/update.md).
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The build system in this directory downloads the necessary source packages,
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builds a cross compiler toolchain and compiles the entire system from scratch
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for the intended target.
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For details on how the build system works or how to add or configure packages,
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see [docs/build.md](docs/build.md).
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For an overview of the available documentation see [docs/index.md](docs/index.md).
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By the way, before you ask: the default root password for the demo setup is
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*reindeerflotilla*. The baud rate on the ALIX board is set to *38400* and on
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all other boards to *115200*.
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The wireless network is called *Pygos Demo Net* and the password
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is *righteous*.
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## Target configuration
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The Pygos build system is driven by toolchain and package configurations
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that are split across multiple *layers*.
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From the product name, a layer configuration file in the `product` sub
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directory is read, specifying what configuration layers to use and in
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what order (later layers can override earlier layers).
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The actual configuration for the build system is in the coresponding sub
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directories in `layer/<name>`.
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For details on the configuration layers see [docs/layers.md](docs/layers.md).
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### Demo configuration
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The system currently contains configurations for the following products:
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- `qemu-test` - A simple target for testing with Qemu (64 bit x86). The boot
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partition is a directory that is exposed as VFAT formated virtio drive.
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The overlay partition is a local directory mounted via 9PFS via virtio.
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- `router-alix` - A pc-engines ALIX board based router (32 bit x86). A DHCP
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server serves IP addresses on the first two interfaces and configures the
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board as default gateway and DNS server. DNS queries are resulved using
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a local unbound resolver. The remaining interface is configured via DHCP
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and packets from the first two are NAT translated and forwarded. The two
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ports have different IP subnets and are not allowed to talk to each other.
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A local SSH server can be reached via the first two ports. A user has to
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be added first, since root login is disabled. A local Nginx web server
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can be reached via the first two ports that serves a simple demo landing
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page.
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- `router-rpi3` - A Raspberry Pi 3 based wireless access point (32 bit ARM).
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A DHPC server serves IP addresses and configures the board as default
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gateway and DNS server. DNS queries are resolved using a local unbound
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resolver. The ethernet interface is configured via DHCP and packets
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are NAT translated and forwarded. A local SSH server can be reached on the
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WLAN interface. A user has to be added first, since root login is disabled.
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A local Nginx web server can be reached on the WLAN interface that serves
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a simple demo landing page.
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## How to build the system
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The system can be built by running the mk.sh script as follows:
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mk.sh <product>
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This will start to download and build the cross toolchain and system in the
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current working directory. The command can (and should) be run from somewhere
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outside the source tree.
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Once the script is done, the final release package is stored in the following
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location (relative to the build directory):
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<product>/deploy/release-<board>/release-<board>.tar.gz
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## Directory overview
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The build system directory contains the following files and sub directories:
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- docs/
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Contains further documentation that goes into more detailed aspects of
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the build system and the final Pygos installation itself.
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- layer/
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Contains the layer specific configuration files. E.g. layer/bsp-alix/
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contains a base configuration for building images for the ALIX board.
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- pkg/
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Contains package build scripts. Each package occupies a sub directory
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with a script named "build" that is used to download, compile and
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install the package.
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- product/
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Contains product configurations. E.g. product/router-alix.layers holds
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the list of layers to apply to build the `router-alix` product.
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- util/
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Contains utility scripts used by mk.sh
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- LICENSE
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A copy of the GNU GPLv3
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- mk.sh
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The main build script that builds the entire system
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- README.md
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This file
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