Linux Cross Reference
Linux/mkrootfs

   #!/bin/bash
   
   # This is the file containing the filesystem.  You probably shouldn't change
   # it since the kernel has this name hard-wired.
   FSFILE=root_fs
   
   # Increase this if you add more stuff and 100 Meg isn't enough.
   FSMEGS=100
   
  # This is a temporary mount point which will be used to mount the new
  # filesystem while it's being built.
  MNTDIR=mnt
  
  # Change these if your distribution is located someplace else
  CDDIR=/mnt/cdrom
  RPMDIR=$CDDIR/RedHat/RPMS
  
  # These are to get bash off the ground.  You probably shouldn't change them.
  BASH_RPMS="filesystem- ldconfig- glibc- libtermcap- bash-"
  
  # These are all the others.  Add new rpms to this list if you want more stuff
  # in your filesystem.
  REST="bdflush- fileutils- grep- mingetty- mount- net-tools- textutils- \
      shadow-utils- chkconfig- procps- sed- mktemp- vixie-cron- modutils- \
      e2fsprogs- logrotate- sysklogd- console-tools- gawk- initscripts- quota- \
      slang- pwdb- cracklib- cracklib-dicts- compat-glibc- glib- pam- \
      sh-utils- util-linux- SysVinit- tcp_wrappers- tcsh- gdbm- perl-5.00503- \
      netkit-base- telnet- ftp- wu-ftpd- indexhtml- zlib- lynx- findutils-"
  
  function rpm_file()
  {
      local name=$1
      set $RPMDIR/$1[-0-9.i]*.rpm
      if [ $# -ne 1 ]
      then
          echo
          echo Found too many rpms for $name 2>&1
      elif [ ! -f $1 ]
      then
          echo
          echo Found no rpms for $name 2>&1
      fi
      echo $1
  }
  
  echo Creating an empty file...
  dd if=/dev/zero of=$FSFILE bs=$((1024 * 1024)) count=$FSMEGS || exit 1
  
  echo Making a file system in it...
  sudo mke2fs -F $FSFILE || exit 1
  
  echo Mounting it on $MNTDIR
  sudo mount -o loop $FSFILE $MNTDIR || exit 1
  cd $MNTDIR
  
  sudo mkdir -p var/lib/rpm/ || exit 1
  sudo mkdir -p var/tmp/ || exit 1
  
  echo Forcibly installing the rpms that bash needs
  
  for rpm in $BASH_RPMS
  do
      rpm_file=`rpm_file $rpm`
      echo Installing $rpm_file
      sudo rpm -i --nodeps --root `pwd` $rpm_file
  done
  
  echo Bash should now work
  
  sudo rpm -i --root `pwd` `rpm_file setup-`
  
  echo -n Making devices...
  sudo mkdir dev
  echo -n "pts "
  sudo mkdir dev/pts
  echo -n "null "
  sudo mknod dev/null c 1 3
  echo -n "console "
  sudo mknod dev/console c 5 1
  echo -n "fhd0 "
  sudo mknod dev/fhd0 b 62 0
  echo -n "tty0 "
  sudo mknod dev/tty0 c 4 0
  echo -n "cua0 "
  sudo mknod dev/cua0 c 5 64
  echo -n "ptmx "
  sudo mknod dev/ptmx c 5 2
  sudo chmod 666 dev/ptmx
  echo ptys
  for i in 0 1 2 3 4 5 6 7 8 9
  do
      sudo mknod dev/ptyp$i c 2 $i
      sudo mknod dev/ttyp$i c 3 $i
      sudo chmod 666 dev/ptyp$i dev/ttyp$i
  done
  
  echo Installing a couple of rpms for info
  sudo rpm -i --root `pwd` `rpm_file info-` `rpm_file ncurses-`
  
 echo Here are all the rest
 for rpm in $REST
 do
     file=`rpm_file $rpm`
     echo $file
     sudo rpm -i --root `pwd` $file
 done
 
 echo Setting up /etc/inittab
 sudo bash -c 'cat > etc/inittab' <<EOF
 #
 # inittab       This file describes how the INIT process should set up
 #               the system in a certain run-level.
 #
 # Author:       Miquel van Smoorenburg, <miquels@drinkel.nl.mugnet.org>
 #               Modified for RHS Linux by Marc Ewing and Donnie Barnes
 #
 
 # Default runlevel. The runlevels used by RHS are:
 #   0 - halt (Do NOT set initdefault to this)
 #   1 - Single user mode
 #   2 - Multiuser, without NFS (The same as 3, if you do not have networking)
 #   3 - Full multiuser mode
 #   4 - unused
 #   5 - X11
 #   6 - reboot (Do NOT set initdefault to this)
 # 
 id:3:initdefault:
 
 # System initialization.
 si::sysinit:/etc/rc.d/rc.sysinit
 
 l0:0:wait:/etc/rc.d/rc 0
 l1:1:wait:/etc/rc.d/rc 1
 l2:2:wait:/etc/rc.d/rc 2
 l3:3:wait:/etc/rc.d/rc 3
 l4:4:wait:/etc/rc.d/rc 4
 l5:5:wait:/etc/rc.d/rc 5
 l6:6:wait:/etc/rc.d/rc 6
 
 # Things to run in every runlevel.
 ud::once:/sbin/update
 
 # Trap CTRL-ALT-DELETE
 ca::ctrlaltdel:/sbin/shutdown -t3 -r now
 
 # When our UPS tells us power has failed, assume we have a few minutes
 # of power left.  Schedule a shutdown for 2 minutes from now.
 # This does, of course, assume you have powerd installed and your
 # UPS connected and working correctly.  
 pf::powerfail:/sbin/shutdown -f -h +2 "Power Failure; System Shutting Down"
 
 # If power was restored before the shutdown kicked in, cancel it.
 pr:12345:powerokwait:/sbin/shutdown -c "Power Restored; Shutdown Cancelled"
 
 
 # Run gettys in standard runlevels
 0:2345:respawn:/sbin/mingetty tty0
 c:2345:respawn:/sbin/mingetty cua0
 
 # Run xdm in runlevel 5
 # xdm is now a separate service
 x:5:respawn:/etc/X11/prefdm -nodaemon
 EOF
 
 echo Setting up /etc/passwd
 sudo bash -c 'cat > etc/passwd' <<EOF
 root::0:0:root:/root:/bin/bash
 user::1:1:user:/home/user:/bin/bash
 EOF
 
 echo Setting up /etc/group
 sudo bash -c 'cat > etc/group' <<EOF
 root::0:root
 user::1:user
 utmp:x:16:
 EOF
 
 echo Setting up etc/fstab
 sudo bash -c 'cat > etc/fstab' <<EOF
 /dev/fhd0                 /                         ext2   defaults 1 1
 none                      /proc                     proc   defaults
 none                    /dev/pts                devpts  mode=0622       0 0
 EOF
 
 echo Setting up etc/sysconfig/keyboard
 sudo bash -c 'cat > etc/sysconfig/keyboard' <<EOF
 KEYTABLE=us
 EOF
 
 echo Setting up etc/securetty
 sudo bash -c 'cat >> etc/securetty' <<EOF
 cua0
 tty0
 EOF
 
 echo Setting up etc/issue
 sudo bash -c 'cat > etc/issue' <<EOF
 Welcome to the user-mode kernel.
 EOF
 
 echo Copying /bin/true over /sbin/hwclock
 sudo cp bin/true sbin/hwclock
 
 echo Setting up etc/pam.d so you can log in
 sudo rm etc/pam.d/*
 sudo bash -c 'cat > etc/pam.d/other' <<EOF
 #%PAM-1.0
 auth     required       pam_unix_auth.so
 account  required       pam_unix_acct.so
 password required       pam_unix_passwd.so
 session  required       pam_unix_session.so
 EOF
 
 sudo bash -c 'cat > etc/pam.d/ftp' <<EOF
 #%PAM-1.0
 auth     required       pam_unix_auth.so
 account  required       pam_unix_acct.so
 password required       pam_unix_passwd.so
 session  required       pam_unix_session.so
 EOF
 
 echo Setting up /etc/sysconfig/network
 sudo bash -c 'cat > etc/sysconfig/network' <<EOF
 NETWORKING=yes
 FORWARD_IPV4=false
 HOSTNAME=uml
 EOF
 
 echo Setting up /etc/sysconfig/network-scripts/ifcfg-umn
 sudo bash -c 'cat > etc/sysconfig/network-scripts/ifcfg-umn' <<EOF
 DEVICE=umn
 IPADDR=192.168.0.253
 NETMASK=255.255.255.0
 NETWORK=192.168.0.0
 BROADCAST=192.168.0.255
 ONBOOT=yes
 EOF
 
 echo Setting up /etc/sysconfig/network-scripts/ifup-umn
 sudo bash -c 'cat > etc/sysconfig/network-scripts/ifup-umn' <<EOF
 #!/bin/bash
 cd /etc/sysconfig/network-scripts
 . network-functions
 
 CONFIG=\$1
 source_config
 
 if [ "\$2" != "boot" ]
 then
     exit 0
 fi
 
 ether=""
 
 for n in \`echo \$IPADDR | sed 's/\./ /g'\`
 do
     ether="\$ether\`echo \$n | awk '{printf "%x", \$0}'\`:"
 done
 
 ether="\$ether"0:0
 
 ifconfig \$DEVICE \$IPADDR hw ether \$ether 
 
 exit 0
 EOF
 
 sudo chmod 755 etc/sysconfig/network-scripts/ifup-umn
 
 cd ..
 sudo umount $MNTDIR || exit 1
 
 echo All set