dracut/dracut

#!/bin/bash
# 
# Generator script for a dracut initramfs
# Tries to retain some degree of compatibility with the command line
# of the various mkinitrd implementations out there
#
# Copyright 2008, Red Hat, Inc.  Jeremy Katz <katzj@redhat.com>
# GPLv2 header here

[ -f /etc/dracut.conf ] && . /etc/dracut.conf

while [ $# -gt 0 ]; do
    case $1 in
	-f|--force)
	    force=yes
	    shift
	    ;;
	-h|--help)
	    echo "Usage: $0 [-f] <initramfs> <kernel-version>"
	    exit 1
	    ;;
	-v|--verbose)
	    set -x
	    shift
	    ;;
	-l|--local)
	    allowlocal="yes"
	    shift
	    ;;
	--allow-missing)
	    shift
	    ;;
	*)
	    break
    esac
done

if [ -n "$2" ]; then
    kernel=$2
else
    kernel=$(uname -r)
fi
if [ -n "$1" ]; then
    outfile=$(readlink -f $1)
else
    outfile="/boot/initrd-$kernel.img"
fi

if [ -f "$outfile" -a  -z "$force" ]; then
    echo "Will not override existing initramfs ($outfile) without --force"
    exit 1
fi

if [ -n "$allowlocal" -a -f ./init ]; then
    source ./dracut-functions
    initfile=./init
    switchroot=./switch_root
    rulesdir=./rules.d
else
    source /usr/libexec/dracut/functions
    initfile=/usr/libexec/dracut/init
    switchroot=/usr/libexec/dracut/switch_root
    rulesdir=/usr/libexec/dracut/rules.d
fi

initdir=$(mktemp -d -t initramfs.XXXXXX)

# executables that we have to have
exe="/bin/bash /bin/mount /bin/mknod /bin/mkdir /sbin/modprobe /sbin/udevd /sbin/udevadm /sbin/nash /bin/kill /sbin/pidof /bin/sleep /bin/echo /usr/sbin/chroot"
lvmexe="/sbin/lvm"
cryptexe="/sbin/cryptsetup"
# and some things that are nice for debugging
debugexe="/bin/ls /bin/cat /bin/ln /bin/ps /bin/grep /bin/more"
# udev things we care about
udevexe="/lib/udev/vol_id /lib/udev/console_init"

# install base files
for binary in $exe $debugexe $udevexe $lvmexe $cryptexe ; do
  inst $binary $initdir
done

# FIXME: would be nice if we didn't have to know which rules to grab....
# ultimately, /lib/initramfs/rules.d or somesuch which includes links/copies
# of the rules we want so that we just copy those in would be best
mkdir -p $initdir/lib/udev/rules.d
for rule in /lib/udev/rules.d/10-console* /lib/udev/rules.d/40-redhat* /lib/udev/rules.d/50* /lib/udev/rules.d/60-persistent-storage.rules /lib/udev/rules.d/61*edd* /lib/udev/rules.d/64* /lib/udev/rules.d/80* /lib/udev/rules.d/95* $rulesdir/*.rules ; do
  cp $rule $initdir/lib/udev/rules.d
done

# terminfo bits make things work better if you fall into interactive mode
for f in $(find /lib/terminfo -type f) ; do cp  --parents $f "$initdir" ; done

# FIXME: i18n stuff isn't really distro-independent :/
if [ -f /etc/sysconfig/keyboard ] || [ -f /etc/sysconfig/console/default.kmap ]; then
    if [ -f /etc/sysconfig/console/default.kmap ]; then
        KEYMAP=/etc/sysconfig/console/default.kmap
    else
        . /etc/sysconfig/keyboard
        if [ -n "$KEYTABLE" -a -d "/lib/kbd/keymaps" ]; then
            KEYMAP="$KEYTABLE.map"
        fi
    fi
    if [ -n "$KEYMAP" ]; then
        [ -f /etc/sysconfig/keyboard ] && inst /etc/sysconfig/keyboard "$initdir"
        inst /bin/loadkeys "$initdir"
        findkeymap $KEYMAP

        for FN in $KEYMAPS; do
            inst $FN "$initdir"
            case "$FN" in
                *.gz)
                    gzip -d "$initdir$FN"
                    ;;
                *.bz2)
                    bzip2 -d "$initdir$FN"
                    ;;
            esac
        done
    fi
fi

if [ -f /etc/sysconfig/i18n ]; then
    . /etc/sysconfig/i18n
    inst /etc/sysconfig/i18n "$initdir"
    [ -z "$SYSFONT" ] && SYSFONT=latarcyrheb-sun16
    inst /bin/setfont "$initdir"

    for FN in /lib/kbd/consolefonts/$SYSFONT.* ; do
        inst $FN "$initdir"
        case "$FN" in
            *.gz)
                gzip -d "$MNTIMAGE$FN"
                ;;
            *.bz2)
                bzip2 -d "$MNTIMAGE$FN"
                ;;
        esac
    done
    if [ -n "$SYSFONTACM" ]; then
        inst /lib/kbd/consoletrans/$SYSFONTACM "$initdir"
    fi
    if [ -n "$UNIMAP" ]; then
        inst /lib/kbd/unimaps/$UNIMAP "$initdir"
    fi
fi

# install our files
cp $initfile $initdir/init
cp $switchroot $initdir/sbin/switch_root

# and create some directory structure
mkdir -p $initdir/etc $initdir/proc $initdir/sys $initdir/sysroot $initdir/dev/pts

# FIXME: hard-coded module list of doom.
[ -z "$modules" ] && modules="=ata =block =drm dm-crypt aes sha256 cbc"

mkdir -p $initdir/lib/modules/$kernel
# expand out module deps, etc
for mod in $(resolveAndExpandModules $modules) ; do
    installmodule $mod $initdir
done

/sbin/depmod -a -b $initdir $kernel
if [ $? -ne 0 ]; then
    error "\"/sbin/depmod -a $kernel\" failed."
    exit 1
fi

# plymouth
if [ -x /usr/libexec/plymouth/plymouth-populate-initrd ]; then
    /usr/libexec/plymouth/plymouth-populate-initrd -t "$initdir" || :
fi

pushd $initdir >/dev/null
find . |cpio -H newc -o |gzip -9 > $outfile
popd >/dev/null