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=""

strstr() { [[ ! ${1#*$2*} = $1 ]]; }

# $1 = file to copy to ramdisk
# $2 (optional) Name for the file on the ramdisk
# Location of the image dir is assumed to be $initdir
inst_simple() {
    local src=$1 target="${initdir}${2:-$1}"
    [[ -f $target ]] && return 0
    mkdir -p "${target%/*}"
    echo "Installing $src" >&2
    cp -fL "$src" "$target"
}

inst_library() {
    local src=$1 dest=${2:-$1}
    [[ -f $initdir$dest ]] && return 0
    if [[ -L $src ]]; then
	reallib="$(readlink "$src")"
	lib=${src##*/}
	realsrc="${src%/*}/$reallib"
	realdest="${dest%/*}/$reallib"
	inst_simple "$realsrc" "$realdest"
	(cd "${initdir}${dest%/*}" && ln -s "$reallib" "$lib")
    else
	inst_simple "$src" "$dest"
    fi
}
	
find_binary() {
    local binpath="/bin /sbin /usr/bin /usr/sbin" p
    [[ ${1##*/} = $1 ]] || { echo $1; return 0; }
    for p in $binpath; do
	[[ -x $p/$1 ]] && { echo "$p/$1"; return 0; }
    done
    return 1
}

# Same as above.
# If the file is a binary executable, install all its
# shared library dependencies, if any.
inst_binary() {
    local bin="$1" target="${2:-$1}"
    local LDSO NAME IO FILE ADDR I1 n f TLIBDIR
    [[ -f $initdir$target ]] && return 0
    # I love bash!
    while read line; do
	[[ $line = 'not a dynamic executable' ]] && return 1
	[[ $line =~ 'not found' ]] &&{
	    echo "Missing a shared library required by $bin." >&2
	    echo "Run \"ldd $bin\" to find out what it is." >&2
	    echo "dracut cannot create an initrd." >&2
	    exit 1
	} 
	[[ $line =~ '([^ ]*/lib[^/]*/[^ ]*\.so[^ ]*)' ]] || continue
	FILE=${BASH_REMATCH[1]}
	[[ -f ${initdir}$FILE ]] && continue
	# 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
	    inst_library "$FILE" "$TLIBDIR/$BASE"
            IF_dynamic="yes"
	    continue
	}
        inst_library "$FILE" 
    done < <(ldd $bin 2>/dev/null)
    inst_simple "$bin" "$target"
}

# same as above, except for shell scripts.
# If your shell script does not start with shebang, it is not a shell script.
inst_script() {
    local src=$1 target=${2:-$1} line
    read -r -n 80 line <"$src"
    [[ $line =~ '(#! *)(/[^ ]+).*' ]] || return 1
    inst "${BASH_REMATCH[2]}" && inst_simple "$src" "$target"
}

# same as above, but specialized for symlinks
inst_symlink() {
    local src=$1 target=$initdir${2:-$1} realsrc
    [[ -L $1 ]] || return 1
    [[ -L $target ]] && return 0
    realsrc=$(readlink "$src")
    [[ $realsrc = ${realsrc##*/} ]] && realsrc="${src%/*}/$realsrc"
    inst "$realsrc" && ln -s "$realsrc" "$target"
}

# udev rules always get installed in the same place, so
# create a function to install them to make life simpler.
inst_rules() { 
    for rule in "$@"; do 
	inst_simple "$rule" "/lib/udev/rules.d/${rule##*/}"
    done
}

# general purpose installation function
# Same args as above.
inst() {
    if (($# != 1 && $# != 2)); then
        echo "usage: inst <file> <root> [<destination file>]"
        return 1
    fi
    local src=$(find_binary "$1") || {
	echo "Cannot find requested file $1. Exiting."
	exit 1
    }
    local dest=${2:-$src}
    for x in inst_symlink inst_script inst_binary inst_simple; do
	$x "$src" "$dest" && return 0
    done
    return 1
}

# install function specialized for hooks
# $1 = type of hook, $2 = hook priority (lower runs first), $3 = hook
# All hooks should be POSIX/SuS compliant, they will be sourced by init.
inst_hook() {
    [[ -f $3 ]] || {
	echo "Cannot install a hook ($3) that does not exist." >&2
	echo "Aborting initrd creation." >&2
	exit 1
    }
    strstr "$hookdirs" "$1" || {
	echo "No such hook type $1. Aborting initrd creation." >&2
	exit 1
    }
    inst_simple "$3" "/${1}/${2}${3##*/}"
}

dracut_install() {
    while (($# > 0)); do
	inst "$1" && shift
    done
}

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 $modname
			continue
		    }
		    inst_simple "$modpath" "/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
} 

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