Alpine Source Map by boot sequence - Revision history

Dlin: find the initramfs source

2016-11-29T07:07:42Z

find the initramfs source

← Older revision		Revision as of 07:07, 29 November 2016
Line 14:		Line 14:
	# Kernel (linux-grsec)		# Kernel (linux-grsec)
	# Init System(openrc)		# Init System(openrc)
	~~## /etc/inittab https://github.com/alpinelinux/aports/blob/master/main/alpine-baselayout/inittab~~
	~~## /etc/runlevels/boot/bootmisc https://github.com/OpenRC/openrc/blob/master/init.d/bootmisc.in~~
	~~## ...~~
	# Shell(busybox's ash)		# Shell(busybox's ash)

Line 31:		Line 28:
	=== syslinux ===		=== syslinux ===
	The 'syslinux.cfg' of {{Pkg\|syslinux}} in put in https://github.com/alpinelinux/alpine-iso/blob/master/Makefile		The 'syslinux.cfg' of {{Pkg\|syslinux}} in put in https://github.com/alpinelinux/alpine-iso/blob/master/Makefile

			=== initramfs ===
			You can extract it by <code>gzip -dc initramfs-grsec\|cpio -vid</code>
			You could remove 'quiet' and add 'debug' flag on kernel boot options to display more debug information.
			The source of init could be found by <code>apk info -W /usr/share/mkinitfs/initramfs-init</code> https://github.com/alpinelinux/mkinitfs

	=== linux-grsec ===		=== linux-grsec ===
Line 39:		Line 41:
	=== openrc ===		=== openrc ===
	The Alpine customized scripts are in https://github.com/alpinelinux/aports/tree/master/main/openrc		The Alpine customized scripts are in https://github.com/alpinelinux/aports/tree/master/main/openrc

			# /etc/inittab https://github.com/alpinelinux/aports/blob/master/main/alpine-baselayout/inittab
			# /etc/runlevels/boot/bootmisc https://github.com/OpenRC/openrc/blob/master/init.d/bootmisc.in


	=== shell ===		=== shell ===

Dlin: /* Boot Sequence */

2016-11-29T04:59:12Z

Boot Sequence

← Older revision		Revision as of 04:59, 29 November 2016
Line 14:		Line 14:
	# Kernel (linux-grsec)		# Kernel (linux-grsec)
	# Init System(openrc)		# Init System(openrc)
			## /etc/inittab https://github.com/alpinelinux/aports/blob/master/main/alpine-baselayout/inittab
			## /etc/runlevels/boot/bootmisc https://github.com/OpenRC/openrc/blob/master/init.d/bootmisc.in
			## ...
	# Shell(busybox's ash)		# Shell(busybox's ash)

Line 24:		Line 27:

	For docker:		For docker:
	# Shell		# Shell (docker image https://hub.docker.com/_/alpine/)

	=== syslinux ===		=== syslinux ===
Line 33:		Line 36:

	The source of kernel in {{Pkg\|linux-grsec}}		The source of kernel in {{Pkg\|linux-grsec}}

			=== openrc ===
			The Alpine customized scripts are in https://github.com/alpinelinux/aports/tree/master/main/openrc

			=== shell ===
			By 'apk info -W /etc/profile', we know the default profile is customized in {{Pkg\|alpine-baselayout}} https://github.com/alpinelinux/aports/tree/master/main/alpine-baselayout

	== Developer Environment ==		== Developer Environment ==

Dlin: Created page with "= Alpine Source Map by boot sequence = {{Draft|Alternate message.}} There are many different running mode/environment for Alpine. Here I try to describe what I've learned by..."

2016-11-29T03:21:11Z

Created page with "= Alpine Source Map by boot sequence = {{Draft|Alternate message.}} There are many different running mode/environment for Alpine. Here I try to describe what I've learned by..."

New page

= Alpine Source Map by boot sequence =

{{Draft|Alternate message.}}

There are many different running mode/environment for Alpine. Here I try to describe what I've learned by tracing the source code.

== Boot Sequence ==

A typical boot sequence of Alpine is:

# Hardware BIOS
# Boot Loader (syslinux's isolinux)
# Initramfs (linux-grsec)
# Kernel (linux-grsec)
# Init System(openrc)
# Shell(busybox's ash)

For Embedded System:

# Boot Loader(UBOOT)
# Kernel
# Init System
# Shell

For docker:
# Shell

=== syslinux ===
The 'syslinux.cfg' of {{Pkg|syslinux}} in put in https://github.com/alpinelinux/alpine-iso/blob/master/Makefile

=== linux-grsec ===
The package kernel into ISO file method in https://github.com/alpinelinux/alpine-iso/blob/master/Makefile.

The source of kernel in {{Pkg|linux-grsec}}

== Developer Environment ==

=== Trace code in docker ===
In any modern Linux distribution, run docker will let you get the same developer environment.
docker run -it --name alpine alpine /bin/sh

Create the build/development inside docker
apk update
apk add tmux vim diffutils # my tools
apk add alpine-sdk xorriso syslinux
adduser YOUR_ID # There are some build scripts can't work under 'root' account.
su - YOUR_ID
abuild-keygen -i -a

Build one package sample(eg. openrc)
git clone https://github.com/alpinelinux/aports
cd aports/main/openrc # change this line to the package which you want to change
abuild -r
ls -l ~/packages/x86_64/openrc*

When you shut down your PC, you can recall the docker 'alpine' container by
docker start alpine
docker attach alpine

=== Test ===
* Test ISO file
qemu-system-x86_64 -enable-kvm -localtime -m 512M -vga std \
-drive file=YOUR_ISO_FILE ,cache=none,if=virtio

* Test Package in docker
To make sure you got the same environment of default package environment, just use docker.
docker run --it --rm --name alpine-test alpine /bin/sh
apk update

# on other window copy your new apk into the 'alpine-test' container
docker cp foo.apk alpine-test:/tmp

# back to 'alpine-test' container
apk fix /tmp/foo.apk

[[Category:Development]]