README.md: Overview of Raspbian's stages
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README.md
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@ -22,3 +22,49 @@ 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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#Stages
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The build of Raspbian is divided up into several stages for logical clarity
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and modularity. This causes some initial complexity, but it simplifies
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maintenance and allows for more easy customization.
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- Stage 0, bootstrap. The primary purpose of this stage is to create a
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usable filesystem. This is accomplished largely through the use of
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`debootstrap`, which creates a minimal filesystem suitable for use as a
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base.tgz on Debian systems. This stage also configures apt settings and
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installs `raspberrypi-bootloader` which is missed by debootstrap. The
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minimal core is installed but not configured, and the system will not quite
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boot yet.
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- Stage 1, truly minimal system. This stage makes the system bootable by
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installing system files like `/etc/fstab`, configures the bootloader, makes
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the network operable, and installs packages like raspi-config. At this
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stage the system should boot to a local console from which you have the
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means to perform basic tasks needed to configure and install the system.
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This is as minimal as a system can possibly get, and its arguably not
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really usable yet in a traditional sense yet. Still, if you want minimal,
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this is minimal and the rest you could reasonably do yourself as sysadmin.
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- State 2, lite system. This stage produces the Raspbian-Lite image. It
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installs some optimized memory functions, sets timezone and charmap
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defaults, installs fake-hwclock and ntp, wifi and bluetooth support,
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dphys-swapfile, and other basics for managing the hardware. It also
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creates necessary groups and gives the pi user access to sudo and the
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standard console hardware permission groups.
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There are a few tools that may not make a whole lot of sense here for
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development purposes on a minimal system such as basic python and lua
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packages as well as the `build-essential` package. They are lumped right
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in with more essential packages presently, though they need not be with
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pi-gen. These are understandable for Raspbian's target audience, but if
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you were looking for something between truly minimal and Raspbian-lite,
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here's where you start trimming.
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- Stage 3, desktop system. Here's where you get the full desktop system
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with X11 and LXDE, web browsers, git for development, Raspbian custom UI
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enhancements, etc. This is a base desktop system, with some development
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tools installed.
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- Stage 4, complete Raspbian system. More development tools, large packages
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like LibreOffice, email, sonic-pi, wolfram-engine, etc. All the things.
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