dracut/dracut-functions

#!/bin/bash
#
# functions used by mkinitrd and other tools.
#
# Copyright 2005-2008 Red Hat, Inc.  All rights reserved.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
# Authors:
#       Peter Jones <pjones@redhat.com>
#       Jeremy Katz <katzj@redhat.com>
#       Jakub Jelinek <jakub@redhat.com>

IF_RTLD=""
IF_dynamic=""
get_dso_deps() {
    local bin="$1" ; shift
    local FILES=() LDSO NAME IO FILE ADDR I1 n f TLIBDIR

    LDSO=$(LANG=C eu-readelf -l $bin 2>/dev/null | \
	awk '/interpreter/ {print $4}' |sed -e 's/]$//')
    [[ $LDSO && $LDSO != $bin ]] || LDSO="$IF_RTLD"
    [[ $LDSO && $LDSO != $bin ]] || return 1
    [[ $IF_RTLD ]] || IF_RTLD="$LDSO"

    # I love bash!
    while read NAME I0 FILE ADDR I1 ; do
	[[ $FILE = $bin ]] && continue
        [[ $FILE = not || $NAME = not ]] && {
	    echo "Missing a shared library required by $bin." >&2
	    echo "dracut cannot create an initrd." >&2
	    return 1
	}
	# see if we are loading an optimized version of a shared lib.
	[[ $FILE =~ '(/lib[^/]*).*' ]] && {
            TLIBDIR=${BASH_REMATCH[1]}
            BASE="${FILE##*/}"
	    # prefer nosegneg libs, then unoptimized ones.
	    for f in "$TLIBDIR/i686/nosegneg" "$TLIBDIR"; do
		[[ -f $f/$BASE ]] || continue
		FILE="$f/$BASE"
		break
	    done
            IF_dynamic="yes"
	}
        FILES+=("$FILE")
    done < <(LD_TRACE_PRELINKING=1 LD_WARN= LD_TRACE_LOADED_OBJECTS=1 \
            $LDSO $bin 2>/dev/null)

    echo "${FILES[@]}"
}

inst() {
    if (($# != 2 && $# != 3)); then
        echo "usage: inst <file> <root> [<destination file>]"
        return 1
    fi
    local file="$1" ; shift
    local root="${1%%/}" ; shift
    local dest="${1##/}"
    [[ $dest ]] || dest="${file##/}"
    mkdir -p "$root/${dest%/*}"
    local RET=0
    local target=""
    [[ -L $file ]] && target=$(readlink "$file")
    if [[ $target && $dest != $target ]]; then
        if [[ -e $root/$dest ]]; then
            RET=0
        else
            ln -sf "$target" "$root/$dest"
            #inst "$target" "$root"
            local BASE=${target##*/}
            local LIBDIR=$(echo "$file" | sed -e 's,\(\(.*\)/\)[^/]\+$,\1,')
            if [[ $LIBDIR = $BASE ]]; then
                local LIBDIR=$(echo "/$dest" | sed -e 's,\(\(.*\)/\)[^/]\+$,\1,')
            fi  
            local TLIBDIR=$(echo "$target" | sed -e 's,\(^/lib[^/]*\)/.*$,\1/,' \
                -e 's,\(\(.*\)/\)[^/]\+$,\1,')
            if [[ $TLIBDIR = $BASE ]]; then
                local TLIBDIR=$(echo "/$dest" | sed \
                    -e 's,\(^/lib[^/]*\)/.*$,\1/,' \
                    -e 's,\(\(.*\)/\)[^/]\+$,\1,')
            fi
            inst "$LIBDIR/$BASE" "$root" "$TLIBDIR/$BASE"
            RET=$?
            return $RET
        fi
    fi
    local SHEBANG=$(dd if="$file" bs=2 count=1 2>/dev/null)
    if [[ $SHEBANG = '#!' ]]; then
        # We're intentionally not playing the "what did this moron run
        # in his shell script" game.  There's nothing but pain in that.
        local interp=$(head -1 "$file" | sed 's/^#! *//')
        inst "$interp" "$root"
        RET=$?
        return $RET
    fi
    if [[ -e $root/$dest ]]; then
        RET=0
    else
        if [[ $target && -L $target ]]; then
            inst "$target" "$root"
            RET=$?
        else
            cp -aL "$file" "$root/$dest"
            local DEPS=$(get_dso_deps "$file")
            if [[ $DEPS ]]; then
		for x in $DEPS; do
                    local TLIBDIR=$(echo "$x" | sed 's,\(/lib[^/]*\)/.*$,\1,')
                    local BASE=$(basename "$x")
                    inst "$x" "$root" "$TLIBDIR/$BASE"
		done
		RET=$?
            fi
	fi
    fi
    return $RET
}

modcat="/lib/modules/$kernel/modules"
instmods() {
    local mod mpargs modpath modname cmd
    while (($# > 0)); do
	mod=${1%.ko}
	case $mod in
	    =ata) instmods $mpargs $(cat "${modcat}.block" |egrep 'ata|ahci');;
	    =*) instmods $mpargs $(cat "${modcat}.${mod#=}");;
	    --*) mpargs+=" $mod";;
	    *) modprobe $mpargs --set-version $kernel --show-depends $mod \
		2>/dev/null |while read cmd modpath; do
		    [[ $cmd = insmod ]] || continue
		    modname=${modpath##*/}
		    modname=${modname%.ko}
		    [[ ${mod/-/_} != ${modname/-/_} ]] && {
			instmods $mpargs $modname
			continue
		    }
		    inst "$modpath" "$initdir" "/lib/modules/$kernel/$modname.ko"
		done
		;;
	esac
	shift
    done
    for fw in $(/sbin/modinfo -F firmware $mod 2>/dev/null); do
        if [ -f /lib/firmware/$fw ]; then
            inst_simple "/lib/firmware/$fw"
        fi
    done
} 

findkeymap () {
    local MAP=$1
    [[ ! -f $MAP ]] && \
	MAP=$(find /lib/kbd/keymaps -type f -name $MAP -o -name $MAP.\* | head -n1)
    [[ " $KEYMAPS " = *" $MAP "* ]] && return
    KEYMAPS="$KEYMAPS $MAP"
    case $MAP in
        *.gz) cmd=zgrep;;
        *.bz2) cmd=bzgrep;;
        *) cmd=grep ;;
    esac

    for INCL in $($cmd "^include " $MAP | cut -d' ' -f2 | tr -d '"'); do
        for FN in $(find /lib/kbd/keymaps -type f -name $INCL\*); do
            findkeymap $FN
        done
    done
}


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