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#!/bin/sh
#
# $Id$
# initrd builder for network booting
# Utility function to determine whether or not a filesystem is usable for
# loopback mounts. Lifted verbatim from Erik Troan's mkinitrd script.
#
is_good_fs() {
local parttype= tmpname=
local dir=$1
[[ -d $dir ]] || return 1
[[ -w $dir ]] || return 1
[[ $dir == */ ]] && dir=${dir%/}
parttype=$(awk "{if (\$2 == \""$dir"\") print \$3 }" /proc/mounts)
while tmpname=${dir%/*} && [[ -z $parttype ]];do
[[ -z $tmpname ]] && tmpname=/
parttype=$(awk "{if (\$2 == \""$tmpname"\") print \$3 }" /proc/mounts)
dir=$tmpname
done
case $parttype in
nfs|tmpfs) return 1;;
*) return 0;
esac
}
# Find a suitable temporary directory (i.e. not tmpfs or nfs)
if is_good_fs $TMPDIR; then
tmpdir=$TMPDIR
elif is_good_fs /tmp; then
tmpdir=/tmp
elif is_good_fs /var/tmp; then
tmpdir=/var/tmp
elif is_good_fs /root/tmp; then
tmpdir=/root/tmp
else
echo "Cannot use a tmp directory" >&2
exit 1
fi
# Default settings (some can be overridden by command-line options)
include_modules=include-modules
initrd_skel=/usr/lib/mkinitrd-net/initrd-skel
kernel_ver=`uname -r`
use_sudo=y
keep=n
output_dir=/var/lib/tftpboot
make_link=y
quiet=
# No need to use sudo if we are root
if [ $UID -eq 0 ]; then
use_sudo=n
fi
USAGE="Usage: $0 [-k|--kernel <kernel_ver>] [-n|--nolink] [-q|--quiet] [-l|--local] [--nosudo] [--keep] [--help] module_list ..."
# Parse command-line options
while [ $# -gt 0 ]; do
case "$1" in
-l|--local)
shift
use_local=y ;;
-k|--kernel)
shift
kernel_ver=$1
shift ;;
--nosudo) shift ; use_sudo=n ;;
--keep) shift ; keep=y ;;
--n|--nolink)
shift ; make_link=n ;;
-q|--quiet) shift ; quiet=-q ;;
--help) shift ; do_help=y ;;
--) shift ; break ;;
-*) echo "${0}: ${1}: invalid option" >&2
echo $USAGE >& 2
exit 2 ;;
*) break ;;
esac
done
# Build list of requested modules
modules="$*"
requested_modules="$modules"
modules="$modules nfs" # Always require nfs for nfs mount
modules="$modules af_packet" # Always require af_packet for udhcpc
# --help => Print help message
if [ "$do_help" == "y" ]; then
echo $USAGE
echo " -k, --kernel Specify kernel version"
echo " -n, --nolink Do not create a matching symbolic link"
echo " -l, --local Run locally from CVS (for developers only)"
echo " --nosudo Do not use sudo (i.e. must run as root instead)"
echo " --keep Keep temporary files instead of deleting them"
exit 0;
fi
# --local => we are running directly from CVS, rather than
# from an installed copy, so use local files and directories
if [ "$use_local" == "y" ]; then
include_modules=./include-modules
initrd_skel=initrd-skel
output_dir=tftpboot
fi
# If use_sudo is set, check that sudo exists
sudo=/usr/bin/sudo
if [ "$use_sudo" == "y" ]; then
if [ ! -x $sudo ]; then
use_sudo=n
echo "WARNING: --nosudo not specified but $sudo not found"
fi
fi
if [ "$use_sudo" == "n" ]; then
sudo=
fi
# Create temporary working files
initrd=`mktemp -d ${tmpdir}/initrd.XXXXXX`
initrdimg=`mktemp ${tmpdir}/initrd.img.XXXXXX`
initrdmnt=`mktemp -d ${tmpdir}/initrd.mnt.XXXXXX`
# Copy skeleton into temporary area
cp -a $initrd_skel/* $initrd/
mkdir -p $initrd/lib/modules/$kernel_ver
$include_modules $quiet -k $kernel_ver -d $initrd/lib/modules/$kernel_ver $modules > $initrd/bin/insert-modules || exit 1
chmod 755 $initrd/bin/insert-modules
# Create empty ext2fs image file
dd if=/dev/zero bs=1k of=$initrdimg count=$((`du -sk $initrd | cut -f1` * 7 / 6)) 2> /dev/null
/sbin/mke2fs -q -F $initrdimg 2> /dev/null
# Mount image file, copy files on, create /dev entries, display free space, umount
$sudo mount -o loop $initrdimg $initrdmnt
cp -a $initrd/* $initrdmnt/
$sudo mknod $initrdmnt/dev/console c 5 1
$sudo mknod $initrdmnt/dev/null c 1 3
$sudo mknod $initrdmnt/dev/ram b 1 1
$sudo mknod $initrdmnt/dev/systty c 4 0
for i in 1 2 3 4; do $sudo mknod $initrdmnt/dev/tty$i c 4 $i; done
if [ "$quiet" == "n" ]; then
df -h $initrdmnt
fi
$sudo umount $initrdmnt
# Create output file
initrd_suffix=`echo $requested_modules | tr " " .`
gzip -9 -n -c $initrdimg > $output_dir/initrd-$initrd_suffix.$kernel_ver.img
# Create symlink
if [ "$make_link" == "y" ]; then
link=$output_dir/initrd-$initrd_suffix.img
[ -L $link ] && rm -f $link
ln -s initrd-$initrd_suffix.$kernel_ver.img $link
fi
# Remove temporary files
if [ "$keep" == "n" ]; then
rm -rf $initrd
rm -f $initrdimg
rmdir $initrdmnt
fi
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