COMP 3000 2011 report ttian1

Part1

Background

The name of the distribution I choose is CRUX. It is a lightweight, i686-optimized Linux distribution. It is delivered by a tar.gz-based package system with BSD-style initscripts(initialization scripts follow the BSD-style)<ref name="BSD-style"> BSD-style initscripts. Retrieved December 12, 2011 from http://crux.nu/Main/Handbook2-7#ntoc50</ref> and also utilizes a ports system to install and upgrade applications.<ref name="About Crux"> About CRUX Linux. Retrieved October 18, 2011 from http://crux.nu/</ref> The ports system is a term refers to a remote repository containing ports and a client program capable of downloading ports from that repository.<ref name="ports-system"> About Ports system. Retrieved December 12, 2011 from http://crux.nu/Main/Handbook2-7#ntoc32</ref> BSD is a definition which stands for Berkeley Software Distribution and it has been considered a branch of UNIX—"BSD UNIX". <ref name="BSD"> Retrieved December 12, 2011 from http://en.wikipedia.org/wiki/Berkeley_Software_Distribution</ref>

VMsetting

Unlike other distributions, the primary goal of CRUX is not to be popular or to put as many features as possible into the system. In fact, CRUX is targeted at experienced Linux users especially. CRUX is first created by Per Liden (found through wikipedia) and the project has grown into a reasonable team whose members are all volunteers sharing a common philosophy. The team provides the core and optional packages for CRUX.

The crux-2.7.iso file is 226 MB. However, after installed, it will become 1.3GB and even more which depends on the ports and packages user want to install.

Installation/Startup & Basic Operation

Attention: My installation section and basic operation section are together.

Firstly, I run the iso file through VMware and it shows me interface which looks like the scs.lambda machine, in other words a shell with command line. Then I follow the handbook <ref name="handbook">Handbook. Retrieved October 18, 2011 from http://crux.nu/Main/Handbook2-7 </ref> provided by the crux.nu to do the installation.

Commands to install CRUX is as below

1. As introduced in the handbook, the first thing I need to do is to partition my hard disk(the virtual one in fact). I login as root and use “fdisk /dev/sda” command to do partition, but I get a bad partition table and I can not mount my partition.

As a result, I try “cfdisk /dev/sda” command and I get a good partition table.

Partition

2. I use “mkfs.ext4 /dev/sda1” command to build my file system. Then I use “mount /dev/sda1 /mnt” to mount my sda1 partition.

3. I use “mkdir /mnt/var” command to make that directory which is for the later installation.

4. I use “mount /dev/sda1 /mnt/var” command to mount the “var” directory.

5. I use “setup” command to go into the CRUX setup windows to start the package installation script.

Setup

After the setup, I can compile the kernel by using following commands:.

6. # Mount --bind /dev /mnt/dev

7. # Mount --bind /tmp /mnt/tmp //Attention: the bind option for Mount command make the first parameter of the arguments inherits the properties of the second parameter.

8. # Mount –t proc proc /mnt/proc

9. # Mount –t sysfs none /mnt/sys

10.# Chroot /mnt /bin/bash

Compile kernel

//Attention: Chroot to change root for current running processes.

11.initiate the password by using command “passwd”.

12.use vim to edit files such as fstab, rc.conf, /rc.d/net and so on.

Then I go to the /usr/src/linux-2.5.35.6 directory to make instal.

Vim systemfile

Using command:

13.# Cd /usr/src/linux-2.6.35.6

14.# Make menuconfig --------//go into a configure script

15.# Make all After install a lot of files, input “make modules_install” for another installation.

16.# Cp arch/x86/boot/bzImage /boot/vmlinuz

17.#cd System.map /boot

18. The last step is to edit the /etc/lilo.conf to boot the kernel I have just compiled and then run lilo to make the new system bootable.

After performing these steps, the CRUX should be installed successfully.

Though I fail to run the kernel for CRUX, I learn a lot through the installation.

1. Because I use a virtual machine to run Crux, the label of the disk is sda, rather than hda.

2. Sometimes there are more than one way to do the same one thing in Linux, but one or more of them may never work well and meet kinds of problems such as “permission denied”. If so, just use other method and it may work well. For example, the partition in my distribution.

3. Learn quite a lot of commands and much familiar with the shell(bash) than before.

4. The MD5<ref name="de5"> Retrieved December 12, 2011 from http://en.wikipedia.org/wiki/MD5 </ref> is the Message-Digest Algorithm which has been employed in a wide variety of security applications, and is also commonly used to check data integrity. When I download software which provides md5, I should check the md5 before installation to make sure it is safe.

5. Os works on their corresponding CPU, such as x86 and i686.

6. Familiar with command “which” and “whereis”, as the command line does not show the directory.

7. Cat command is very useful to view files and vim is so powerful that I can use it to edit system files. And I think that is very dangerous.

8. Chmod 777 * is dangerous but useful sometimes because it will make files writable, readable and executable to all the groups.

9. Learn about the “mount”, “swapon” command and so on.

Usage Evaluation

From my point of view, as I am a fresh man to Linux, CRUX is really quite targeted to experienced users. Just as the developer says, I do have to do almost everything by myself by using the shell, even compile my own kernel! And the command line is only the “#” symbol, rather than shows almost the full directory in other distribution of Linux such as Ubuntu. So I have to be very familiar with the directory commands and clearly know what I am doing and where I am, or I have to use “cd ..” command to go back to top directory and go into the directory I want a again and that makes me think that the CRUX is not very user friendly. However, as one of the features of CRUX, it really makes the screen “light and clean”. Another feature of CRUX is its ports system, and it makes it much easier to install and update package. CRUX does not contain the gcc C compiler. And it does not install KDE automatically, so the UI looks like the lambda machine we use at laboratory. And I think using Crux is much more difficult than using Ubuntu. At last, I want to say that I choose CRUX because it sounds cool and it is a lightweight distribution of Linux. Though it really takes me a lot of time to do with and be familiar with CRUX, I love this distribution because it forces me to learn much more about Linux from the surface to the kernel.

Part2

Software Packaging

Packaging Format and Utilities

Hannah Montana Linux is a unix-like Linux Operating System based on Kubuntu. The package manager of it is Debian apt(for Advanced Package Tool) which is a higher level tool than dkpg<ref name="dkpg">Debian dkpg Package Tool. Retriever November 14, 2011 from http://en.wikipedia.org/wiki/Dpkg</ref> and the package format is .deb.<ref name=".deb"> .deb format. Retrieved December 12, 2011 from http://www.debian.org/doc/manuals/debian-faq/ch-pkg_basics</ref> This package manager works with dkpg to install, remove, update, resolves problems of dependencies and retrieves the requested packages.<ref name="apt">Debian Apt Package Tool. Retriever November 14, 2011 from http://wiki.debian.org/Apt</ref> In addition to apt and dkpg, Hannah Montana Linux also use aptitude as one of utilities for package management.

Listing Installed Packages

As Hannah Montana Linux uses dpkg, apt and aptitude as packager tools, there several ways to get the list of installed packages.

The dpkg Package Manager lists all the packages installed on the system

You can use command “dpkg –l” or just use “aptitude” to go to the package management windows provided by aptitude to view all the installed packages.

Adding and Removing Packages

To add packages, you can use dpkg -i <package name.deb> where your current directory should contain the package. You can use "aptitude" command to install packages in the aptitude windows or use "apt-get install <package>” command to do the installation.

To remove packages, you can use "dpkg -r <package_name>" which will leave the configuration file or "dpkg -pure <package_name>" which will remove the configuration as well. You can use "aptitude" command to remove packages in the aptitude windows or use "apt-get remove <package>” command to do that.

The Aptitude Package Manager can be used to list, installe or remove the packages in the system

Software Catalog

By using command “aptitude”, you can view the information of the packages of Hannah Montana Linux. It shows that there are 20653 new packages, 933 installed packages, 5280 not installed packages, 2605 virtual packages and 13044 tasks. By clicking the options, you can enter the sub-directories to view those packages which are new, installed or virtual packages for utilities such as admin, base, devel, doc, editors, kde and so on.

Major package versions

The table below lists the version numbers and upstream sources of various major software packages included in Hannah Montana Linux

Package	Version	Latest Official Release	Official Source	fork	Command
Linux Kernel	2.6.28-13-generic #44 Ununtu (2009-07-02 )	3.1.1<ref>The Linux Kernel Archives. Retrieved November 14, 2011 from http://www.kernel.org/</ref> (2011-11-11)	http://www.kernel.org/	https://launchpad.net/ubuntu/+source/linux/2.6.28-13.44/+build/1055416	uname -a
libc	GNU libc 2.9 (2009-05-17)	2.14<ref>GNU C Library. (Oct 17,2011). Retrieved on November 14, 2011 from http://en.wikipedia.org/wiki/GNU_C_Library</ref> (Oct 17,2011)	http://www.gnu.org/s/libc/	http://ftp.gnu.org/gnu/libc/	Command /lib/libc.so.6 --version
X.org X server	X server 1.6.0 (2009-2-25)	X server 1.11.2 <ref>X server. Retrieved on November 14, 2011 from http://www.x.org/wiki/Releases?action=show&redirect=XorgReleases</ref> (2011-11-04)	http://www.x.org/wiki	https://launchpad.net/ubuntu/+source/xorg-server/2:1.6.0-0ubuntu14	X –version
Bash (Shell)	3.2.48(1) (2008-11-18)	4.2 <ref>Bash. Retrieved November 14, 2011 from http://en.wikipedia.org/wiki/Bash_%28Unix_shell%29</ref> (2011-Oct-25)	http://www.gnu.org/software/bash/	http://ftp.gnu.org/gnu/bash/	bash –version
Gcc(the GNU Compiler Collection)	4.3.3 (2009-01-24)	4.6.2 <ref>Gcc. Retrieved on November 14, 2011 from http://gcc.gnu.org/</ref> (2011-08-26)	http://gcc.gnu.org/	http://gcc.gnu.org/gcc-4.3/	gcc –version
DPKG	1.14.24 ubuntu1 (2008-12-29 )	1.16.1.2(test) <ref> DPKG Retrieved December 16, 2011 from http://packages.debian.org/wheezy/dpkg</ref> (2011-12-16)	http://packages.debian.org/wheezy/dpkg	https://launchpad.net/debian/+source/dpkg/1.14.24	dpkg –version
KDE	4.2.2 (2009-04-02)	4.7.1<ref>KDE. Retrieved on November 14, 2011 from http://busybox.net/</ref> (2011-09-07)	http://www.kde.org/	http://www.kde.org/info/4.2.2.php	the About KDE option in the tool bar
Amarok(Audio Player)	2.0.2 (2009-03-05)	2.5 Beta1 <ref>Audio Player. Retrieved on November 23, 2011 from http://src.chromium.org/viewvc/chrome/releases/?sortby=date</ref>	http://amarok.kde.org/	http://amarok.kde.org/en/releases/2.0.2	the About Amarok option in the tool bar
QT	4.5.0 (2009-05-11)	4.7.4 <ref>QT. Retrieved November 14, 2011 from http://en.wikipedia.org/wiki/Qt_(framework)</ref> (2011-09-01)	http://qt.nokia.com/	http://qt.nokia.com/products/changes/changes-4.5.0/	conqueror -v
GZIP	1.3.12 (2007-04-13)	1.4 <ref>GZIP. (2011, Oct. 25). Retrieved on November 14, 2011 from http://ftp.gnu.org/gnu/gzip/</ref> (2010-01-20)	http://ftp.gnu.org/gnu/gzip/	http://ftp.gnu.org/gnu/gzip/	gzip --version

Comparison of Packages to their Latest Stable Release

Hannah Montana Linux is based on Kubuntu.

The following table will discuss some of the differences between these packages and their upstream counterparts, as well as the services they provide.

Package	Purpose and Differences from Upstream Source
Linux Kernel	The Linux kernel is an operating system kernel used by the Linux family of Unix-like operating systems. While a list of the individual modifications done to version 2.6.28-13.44_i386 would be too long to list, all of the changes are listed in the change log inside the diff file.For example, it adds missing mvsas (Marvel SAS 6440) module configuration and support for G41 chipset. It is developed for Ubuntu Jaunty i386.
Glibc	The GNU C library(Glibc) is used as the C library in the GNU system and most systems with the Linux kernel. According to the change log in the diff file, there are quite a lot of modifications for 2.9 release. The user-visible change for this release includes new Linux interfaces, new fixed-size conversion macros and so on.
X.org	Xorg refers to the X server release packages stewarded by the X.Org Foundation, which is hosted by freedesktop.org, and grants public access to the standard X Window releases for the efforts of the free and open source software community. There are no huge changes since 1.5.99.903.diff file. Some typos and bugs are fixed. Xorg provides the basis for GUIs.
Bash	Bash is a Unix shell written by Brian Fox for the GNU Project as a free software replacement for the Bourne shell (sh). No huge changes are made to bash-3.2.48 compared to bash-3.2-beta. According to the change log in the source package, several bugs are fixed. For example a bug in the printf builtin that caused the %q format specifier to ignore empty string arguments.c is fixed.
GCC	The GNU Compiler Collection (GCC) is a compiler system produced by the GNU Project supporting various programming languages. After reading the change log in the diff file, I have found that some architectures and ports are declared obsolete, some options such as -fforce-mem are removed as well.
DPKG	Dpkg is the software at the base of the Debian package management system. dpkg is used to install, remove, and provide information about .deb packages. According to the change log in the diff file, there are few changes made to DPKG 1.14.24. It fixes mostly the parsing of objdump output (by dpkg-shlibdeps) in a special case where the symbol name is separated only with a single space, dpkg-shlibdeps behaviour when Build-Depends-Package is used in the symbols file and dpkg-source to correctly extract a source package even when called from a non-writable directory when a target directory has been specified on the command line.
KDE	KDE offers a full suite of user workspace applications which allow interactions with these operating systems in a modern, graphical user interface. The most user-visible improvements made to KDE 4.2.2 according to the Enhancements section in the announcements. The first improvement is that KRunner's threaded search for results is now more robust and a possible deadlock condition has been fixed. The second one is that Synching email of cached IMAP accounts is now faster and a number of displaying changes makes reading emails smoother experiencs. The third one is that Text rendering has been optimized, support for CSS selectors has further been improved as well. In addition to that, there are lots of modifications in the change log in the diff file as well.
Amarok	Amarok is a powerful music player for Linux and Unix, MacOS X and Windows with an intuitive interface. After reading the announcement, I have found that there are major changes which are made to Amarok 2.0.2. The first change is that it will show a statusbar message when loving a lastfm track. The second one is that an error message will be showed when Wikipedia information cannot be retrieved. Of course, bugs are fixed.
QT	QT is a cross-platform application framework that is widely used for developing application software with a graphical user interface (GUI) and also used for developing non-GUI programs such as command-line tools and consoles for servers. According to the change log in the diff file, there are many new features added to the QT 4.5.0, such as the ability to set the text margin size. Some functions such as QGraphicsView are optimized, bugs are fixed as well.
GZIP	Gzip is any of several software applications used for file compression and decompression. After reading the change log in the source package, I have found that there are many tiny changes are made to gzip-1.3.13, including names changed such as README-cvs, files added such as stdlib_h.m4 and removed such as getdelim.c.

Initialization

As Hannah Montana Linux is based off of Kubuntu, it is not surprising that Hannah Montana Linux use GRUB(short for GRand Unified Bootloader) as bootloader. Further more, because Ubuntu 6.10 (Edgy Eft) and later contain Upstart as a replacement for the traditional init-process,<ref> Kunbuntu init process. Retrieved December 10, 2011 from http://en.wikipedia.org/wiki/Runlevel</ref> Hannah Montana Linux use Upstart to do initialization, where Upstart is an event-based replacement for the traditional init daemon — the method by which several Unix-like computer operating systems perform tasks when the computer is started. <ref> Upstart. Retrieved December 10, 2011 from http://en.wikipedia.org/wiki/Upstart </ref>

The upstart use the /etc/event.d directory(Hannah Montana Linux use /event.d to replace inittab file) as the guide to determine the sequence to run scripts and match the paths of scripts. Upstart comes with a set of default jobs which it installs into /etc/init. These are based on the sysvinit configuration of Debian-based systems, including running the /etc/init.d/rc script which contains a number of start/stop scripts for various services on your system.When it is initializing, upstart checks the /etc/event.d directory, follows the guide and then go to /etc/rc#.d directory to start or stop processes. <ref> How upstart work. Retrieved December 12, 2011 from http://upstart.ubuntu.com/getting-started.html </ref>

Initialization

After the daemon processes are running and the environment of the system is set up, the init program runs six terminals and bring users to the login GUI windows, and the initialization is done.<ref> How to init. Retriever December 12, 2011 from http://www.yolinux.com/TUTORIALS/LinuxTutorialInitProcess.html</ref> By viewing the /etc/rc#.d directory(# stands for 0,1,2,3,4,5,6), I have found the scripts corresponding to System log domean, Kernel log domean, System kernel message dbus, Hardware abstraction layer hald and Bluetooth are S10sysklgd, S11klogd, S12dbus, S24hal and S25bluetooth. As the prefix S means start and the number following S determines the order to run the scripts, these five programs runs with the order log domean, Kernel log domean, System kernel message dbus, Hardware abstraction layer hald and Bluetooth just as the picture.

Reference

<references />