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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
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<HEAD>
<TITLE>Building a RedHat root image</TITLE>
<!-- Created by: Michael Richardson, 22-Nov-2001 -->
<!-- Changed by: Michael Richardson, 22-Nov-2001 -->
</HEAD>
<BODY>
<H1>Building a RedHat root image</H1>
<P>
The image required to use User-Mode-Linux is just a normal set of executables.
These can be extracted from a RedHat distribution using the following proceedure.
</P>
<P>
There is a script in testing/utils called <CODE>uml-rhroot.sh</CODE>. It takes
two arguments:
<UL>
<LI> a directory in which to put resulting directory tree.
<LI> a directory tree containing the RedHat distribution RPMs. This may be
in one of three forms:
<UL>
<LI> a directory containing the directories "disc1" and "disc2". These
could be ISO images that are mounted loopback via, for instance:
<PRE>
<CODE>
mkdir -p /distros/redhat/7.2/disc1 /distros/redhat/7.2/disc1
mount -t iso9660 -o loop,ro /distros/redhat/7.2/enigma-i386-disc1.iso /distros/redhat/7.2/disc1
mount -t iso9660 -o loop,ro /distros/redhat/7.2/enigma-i386-disc2.iso /distros/redhat/7.2/disc2
</CODE>
</PRE>
or even two real CDroms mounted somewhere. In the example above, use "/distros/redhat/7.2" as the distribution directory.
</LI>
<LI> a directory containing a "merged" disc1 and disc2 as suggested by RedHat in <A HREF="http://www.redhat.com/docs/manuals/linux/RHL-7.2-Manual/install-guide/s1-install-network.html#S2-INSTALL-SETUPSERVER">http://www.redhat.com/docs/manuals/linux/RHL-7.2-Manual/install-guide/s1-install-network.html under "Setting up the Server"</A>.
<LI> a directory containing all the required RPMs. (See <A HREF="uml-rhroot-list7.2.txt">list of RPMs</A>)</LI>
</UL>
</UL>
</P>
<P>The unpacked distribution will take approximately 133Mb. You will
want to locate this on the same partition as your intended root
trees for your User-Mode-Linux's as this will permit hard links to
be used, saving disk space.
</P>
<P>
Because the RPM command used uses the chroot(2) system call and
needs to change ownership of the files that it creates, it must be
run as root. Afterward, you should chown the entire directory to the
userid that you will be using for testing (i.e. probably
yours). It should eventually suffices to make sure that you can read
every file.
</P>
<P>
You should be able to chroot to this directory and run programs. If
you can not at least run ls, then there is a problem.
</P>
<P>
Expect a couple of errors about install-info.
</P>
<P>
An example:
<PRE>
<CODE>
Script started on Thu Nov 22 15:51:15 2001
cassidy:/c2/user-mode-linux# df
Filesystem 1k-blocks Used Available Use% Mounted on
/dev/hda1 3844408 1673528 1975584 46% /
/dev/hda3 12495048 1823404 10036884 16% /home
/dev/hdc1 10325748 805056 8996172 9% /c1
/dev/hdc2 10325780 4815160 4986100 50% /c2
/dev/hdc3 10325780 2972480 6828780 31% /c3
/dev/hdc4 7495084 3059640 4054704 44% /c4
/distros/redhat/7.2/enigma-i386-disc1.iso
662072 662072 0 100% /distros/redhat/7.2/disc1
/distros/redhat/7.2/enigma-i386-disc2.iso
653740 653740 0 100% /distros/redhat/7.2/disc2
cassidy:/c2/user-mode-linux# /c2/freeswan/sandbox-main/testing/utils/uml-rhroot.sh
Usage: /c2/freeswan/sandbox-main/testing/utils/uml-rhroot.sh rootdir cdimagedir
cassidy:/c2/user-mode-linux# /c2/freeswan/sandbox-main/testing/utils/uml-rhroot.sh /c2/user-mode-linux/rpm-root/root /distros/redhat/7.2
Assuming RH disc1 at /distros/redhat/7.2/disc1/RedHat/RPMS
and disc2 at /distros/redhat/7.2/disc2/RedHat/RPMS
/var/tmp/rpm-tmp.99149: /sbin/install-info: No such file or directory
error: execution of %post scriptlet from textutils-2.0.14-2 failed, exit status 127
cat: /proc/mounts: No such file or directory
warning: /var/lib/rpm/Basenames created as /var/lib/rpm/Basenames.rpmnew
warning: /var/lib/rpm/Conflictname created as /var/lib/rpm/Conflictname.rpmnew
warning: /var/lib/rpm/Group created as /var/lib/rpm/Group.rpmnew
warning: /var/lib/rpm/Name created as /var/lib/rpm/Name.rpmnew
warning: /var/lib/rpm/Packages created as /var/lib/rpm/Packages.rpmnew
warning: /var/lib/rpm/Providename created as /var/lib/rpm/Providename.rpmnew
warning: /var/lib/rpm/Requirename created as /var/lib/rpm/Requirename.rpmnew
warning: /var/lib/rpm/Triggername created as /var/lib/rpm/Triggername.rpmnew
You should now chown it to yourself.
cassidy:/c2/user-mode-linux# chown -R mcr rpm-root/root
cassidy:/c2/user-mode-linux# ls rpm-root/root
bin dev home lib opt root tmp var
boot etc initrd mnt proc sbin usr
cassidy:/c2/user-mode-linux# chroot rpm-root/root
cassidy:/# ls
bin dev home lib opt root tmp var
boot etc initrd mnt proc sbin usr
cassidy:/# exit
cassidy:/c2/user-mode-linux# exit
Script done on Thu Nov 22 15:54:33 2001
</CODE>
</PRE>
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