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资源说明：Live FreeBSD creation scripts
0) TABLE OF CONTENT
1) Introduction
2) Live Image Types
2.1) ISO Type 1
2.2) ISO Type 2
2.3) ISO Type 3
2.4) Flash Type 1
3) Options and Getting Started
3.1) Creating World Archive
3.2) Creating Kernel Archive
4) Running the scripts
4.1) dragonbsd.sh
4.2) usbbt.sh
1) INTRODUCTION
This directory has the following files:
/dragonbsd.sh - Master script for creating Live images
/options - Various options for controlling the master image
/README - This file
/TODO - Upcoming features
/usbbt.sh - Tool for writing images to devices
and following directories:
/files - Files to be copied to system image (verbatim copied)
/scripts - Scripts that are run in a chroot env in the system image
Combined these files can create a Live image of FreeBSD. This image is able
boot and run by it self (and sometimes the medium can be removed once the kernel
has been loaded).
2) LIVE IMAGE TYPES
This script automatically creates three ISO images, each image has a different
set of capabilities. The script is also able to install inself onto and block
device (such a USB Flash Memory). Below are details for the four types:
2.1) ISO TYPE 1
Location: work/DragonBSD.iso
System Image: Compressed
Image Backing: CD/DVD (physical)
Filesystem: Completely editable
This image has a compressed system image thus takes up less physical space, this
however comes at a cost of latency (to both read the increased sector size of 8k
and to decompress that sector). UZIP however does have caching. Ff the medium
is slow this method could actually increase read access if files are sequentially
allocated [benchmark required] since there will be less reading of the medium
required.
2.2) ISO TYPE 2
Location: work/DragonBSD2.iso
System Image: Compressed
Image Backing: RAM (non-physical)
Filesystem: Completely editable
This image is loaded into RAM at boot (via loader) and is compressed to conserve
RAM. Although this method has some latency the only cost is decompression and,
on modern systems, my result in faster access then that provided by hard-drives.
(See above for latency description of UZIP, note however there is no access
latency for reading the sector)
2.3) ISO TYPE 3
Location: work/DragonBSD3.iso
System Image: Uncompressed
Image Backing: CD/DVD (physical)
Filesystem: Partially editable
This is a very simple image with the full system being the CD/DVD. No
compression and limited edibility (the FreeBSD rc.d scripts automatically
mount various mdmfs to allow the system to run). This is a very restrictive
environment, networking will be limited (DHCP will not be able to setup a DNS
resolution path).
3) OPTIONS AND GETTING STARTED
The 'options' file contains various options to control how the image is built,
it is well documented [TODO] so start editing it with your favourite text
editor. The most important variables are:
WORKDIR - Location of files, objected to be created (default: work/)
WORLDSRC - Archive of world (see below for details)
KERNELSRC - Archive of kernel (see below for details)
FILESRC - Location of files to copy across to image
PKGDIR - Location of packages to install (good place is /usr/ports/packages/All)
PKGS - List of packages to install [TODO, further explanation]
PORTS - List of ports to install [TODO, further explanation]
3.1) CREATING WORLD ARCHIVE
These scripts require the world to be archives (does not have the ability to
compile directly from src [TODO]). The following is a simple approach to
creating the archive at $WORLDSRC:
# mkdir /tmp/world
# (cd /usr/src; make world distribution DESTDIR=/tmp/world)
# tar -C /tmp/world -cjf $WORLDSRC .
# (chflags -R 0 /tmp/world; rmdir -rf /tmp/world)
3.2) CREATING KERNEL ARCHIVE
These scripts require the kernel to be archives (does not have the ability to
compile directly from src [TODO]). The following is a simple approach to
creating the archive at $KERNELSRC:
# mkdir /tmp/kernel
# (cd /usr/src; make world distribution DESTDIR=/tmp/kernel)
# tar -C /tmp/kernel -cjf $KERNELSRC .
# (chflags -R 0 /tmp/kernel; rmdir -rf /tmp/kernel)
Note: The following modules need to be compiled (either into the kernel or as a
module):
- geom_label
- geom_uzip
- cd9660
- unionfs
- zlib
4) RUNNING THE SCRIPTS
Once the options have been set, the archives created, the packages created and
files/ populated the scripts are ready to be run. The first step is to create
the system images. This is done by running dragonbsd.sh. Optionally, the
image can be loaded onto a block device by running usbbt.sh. Below are the
instructions:
4.1) dragonbsd.sh
To start just run
# ./dragonbsd.sh
and the three ISO images will be created under work/.
Once this is done various subdirectories can be edited and the system images
recreated. work/base/ contains the system, and when edited a full rebuild is
required. work/btstrp/ contains the code for ISO Type 2 (DragonBSD2.iso), the
system is already compressed. work/btstrp2/ contains the code for ISO Type 1
(DragonBSD.iso), the system is already compressed. The folling dragonbsd.sh
options can be used to recreate the system images:
rebuild - A full rebuild of the system images (creates the compressed
system used by ISO Type 1/2)
rebuildiso) - Rebuilds the DragonBSD*.iso images (implied by rebuild above)
Once completed the working directory can be erased with:
# ./dragonbsd.sh clean
Please use this method as some mount points may exists under work/ and a simple
# rm -rf work/ ## And can cause untold destruction and pain. Be warned!!!
4.2) usbbd.sh
This creates a system image similar to a ISO Type 1 except the alterations of
the system are perpetual (remains after a reboot) since a second partition is
created on the block device that contains the alterations.
WARNING: MAKE SURE THE DEVICE USED DOES NOT CONTAIN ANYTHING VALUABLE ON IT.
Like your home directory, backups or your CURRENT SYSTEM since the
content of the device will be permanently ERASED!!!
[TODO: Make sure the device is not currently mounted]
# ./usbbt.sh /dev/da0
To load the system onto the first da device (usually a flash memory stick).
本源码包内暂不包含可直接显示的源代码文件，请下载源码包。
