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$Id: README,v 1.29 2003/02/18 18:28:06 freesource Exp $
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Program: gBootRoot pronounced "bOOtrOOt"
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License: GNU General Public License
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BUILDING
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---------
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If you can compile a kernel on your system, then you should have no
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problems getting the Makefile to work, and if you are using the
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sources for the Debian package, then you can always do an "apt-get
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build-dep gbootroot" to automatically figure out your build
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requirements. Gbootroot makes its own root_fs, when the output gets
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colorful (blue and red) you know this is happening. If things go
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wrong at this point you will want to look at the requirements below.
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You will want wget installed because the Makefile attempts to download
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the necessary sources and then places them in the sources/ directory.
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This is what makes the unofficial Debian and RedHat source packages
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unique, because usually another package would provide the necessary
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sources since official distributions aren't always used online. On
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the other hand, this is a FEATURE. Anytime you want to update
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gbootroot to the current user-mode-linux patch just change the
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Makefile PATCH_VERSION, run ./configure, run "make clean", and then
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"make". If this is your first time making gbootroot from the source
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package just run ./configure and "make".
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The two root_fs created are root_fs_helper and Initrd.gz.
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Root_fs_helper has lots of different filesystem utilities, but the
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CRUCIAL ones to get the build to work properly are mke2fs and
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mkcramfs. Here's a list of what utilities are included: mke2fs
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mkcramfs genromfs mkfs.minix mkminix mkreiserfs mkfs.jffs mkfs.jffs2
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These are the build-depends from the Debian source package that can be
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used as a guide for other distributions: binutils (>= 2.12.90.0),
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fileutils (>= 4.0), gcc (>= 2:2.95.4), make, libc6-dev (>= 2.2.5),
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bin86, wget, mkcramfs, e2fsprogs, reiserfsprog, genromfs, util-linux,
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mtd-tools, m4, libreadline4-dev, libncurses5-dev, libgtk-perl (>=
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0.7002) [see gbootroot's site], libexpect-perl [required rpms can be
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found at gbootroot's site]. For instance, in Redhat libc6-dev
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translates into glibc-devel and glibc-kernheaders, libreadline4-dev
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translates into readline-dev, libncurses5-dev translates into
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ncurses-devel, reiserfsprog translates into reiserfs-utils. Mandrake
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requires glibc-static-devel along with glibc-devel, but the other
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package names are more similar to Debian.
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Suse users may need to edit /usr/include/asm/ptrace.h adding "#define
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FRAME_SIZE 17" after the "#define SS 16" line or else uml won't
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compile. This was observed in Suse 7.3; why this line is missing is a
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complete mystery.
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UML KERNEL CUSTOMIZATION
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------------------------
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You may want to add your own customizations to the uml kernel. To
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accomplish this you will need to understand that the Makefile runs
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oldconfig on the configuration file ".config" which is first copied
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from user-mode-linux/usr/lib/uml/config to .config in the
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linux-$VERSION directory where the kernel sources reside. What this
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means is that after doing a make config or one of the config alternatives
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from the kernel sources directory, you should copy the customized
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configuration file you made to the ../user-mode-linux/usr/lib/uml
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directory and then run gbootroot's Makefile.
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INSTALLING
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----------
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If you build the package as a non-root user, and you don't have
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permissions to write to system directories you can always run
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gbootroot from the immediate source directory "./gbootroot --home ."
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or "perl -I . ./gbootroot --home ." if there is already another
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installed version on the system.
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To install on the system type "make install" and follow the
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instructions in the "Important Configurations" section near the bottom
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of this page, and then run gbootroot.
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When you run gbootroot if a boot or root method are missing required
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programs, pop-up dialog boxes and information from the verbosity box
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will give a good indication of what is causing the problem.
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REQUIREMENTS TO RUN GBOOTROOT
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-----------------------------
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PERL MODULES
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Gtk-Perl (Required for CLI/GUI)
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-------------------------------
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Version 0.7002 or greater.
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http://freshmeat.net/projects/gtk-perl
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[ The next three are required for automated normal (non-root) user
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functionality . ]
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Expect (tested with 1.11/1.15)
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------------------------------
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http://www.perl.com/CPAN/modules/by-module/Expect/
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http://sourceforge.net/projects/expectperl
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RPM version can be found at sf.net/gbootroot.
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IO::Stty
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--------
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http://www.perl.com/CPAN/modules/by-module/IO/IO-Stty-.02.tar.gz
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RPM versions can be found at sf.net/gbootroot.
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IO::Tty
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-------
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http://www.perl.com/CPAN/modules/by-module/IO/IO-Tty-1.02.tar.gz
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http://sourceforge.net/projects/expectperl
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RPM versions can be found at sf.net/gbootroot.
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BOOT METHODS
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2 disk compression
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------------------
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This method will tell you when any of these utilities are missing:
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ash lilo bzip2 file
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ROOT METHODS
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Yard (This is a method - not a program)
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--------------------------------------
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Watch the verbosity box, it will be obvious when a required command is
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missing. Make sure you have this file installed on your system:
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file
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IMPORTANT CONFIGURATIONS
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"chown 0:0 /usr/bin/uml_net; chmod 4755 /usr/bin/uml_net" so normal
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users can have network capabilities; ofcourse, you may totally avoid
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doing the suid thing by using tunctl.
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Should the host kernel have the skas patch applied?
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"Yes, I highly recommended it. It's a great performance improvement,
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and gbootroot will run a lot better. Modes are figured out
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automatically by skas-or-tt so don't add mode={tt,skas} in the UML
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box. The host-skas3.patch is available from
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http://user-mode-linux.sf.net/dl-sf.html . Alternatively, there is a
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skas module available from http://www.rogerbinns.com/modskas3/ ."
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DOCUMENTATION
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Documentation and FAQ are in doc/html/index.html
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Have fun!
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-Jonathan
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Please infuse your suggestions, bug reports, insults, and patronage back to:
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Jonathan Rosenbaum <freesource@users.sourceforge.net>
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