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.
There is a script in testing/utils called uml-rhroot.sh. It takes
two arguments:
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
or even two real CDroms mounted somewhere. In the example above, use "/distros/redhat/7.2" as the distribution directory.
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.
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.
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.
Expect a couple of errors about install-info.
An example:
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