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