diff options
Diffstat (limited to 'gpxe/contrib/initrd/mkinitrd-net')
| -rwxr-xr-x | gpxe/contrib/initrd/mkinitrd-net | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/gpxe/contrib/initrd/mkinitrd-net b/gpxe/contrib/initrd/mkinitrd-net new file mode 100755 index 00000000..0c95ebd1 --- /dev/null +++ b/gpxe/contrib/initrd/mkinitrd-net @@ -0,0 +1,165 @@ +#!/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 |