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#!/bin/sh
# mkinitcpio - modular tool for building an init ramfs cpio image
#
# IMPORTANT: We need to keep a common base syntax here
# because some of these hooks/scripts need to run under
# the klibc shell or even busybox's ash - therefore, the
# following constraints should be enforced:
# variables should be quoted and bracketed "${SOMEVAR}"
# inline execution should be done with $() instead of backticks
# use "x${var}" = "x" to test for nulls/empty strings
# incase of embedded spaces, quote all path names and string comaprissons
#
# TODO
# Settings
BASEDIR=""
KERNELVERSION="$(uname -r)"
CONFIG="mkinitcpio.conf"
HOOKDIR="hooks"
SAVELIST=""
GENIMG=""
APPEND=""
QUIET="n"
APPNAME=$(basename "${0}")
usage ()
{
echo "${APPNAME}: usage"
echo " -c CONFIG Use CONFIG file. default: /etc/mkinitcpio.conf"
echo " -k KERNELVERSION Use KERNELVERSION. default: $(uname -r)"
echo " -s Save filelist. default: no"
echo " -b BASEDIR Use BASEDIR. default: /"
echo " -g IMAGE Generate a cpio image as IMAGE. default: no"
echo " -a Append to an existing filelist. default: no"
echo " -q Quiet output. Default: no"
echo " -h This message."
exit 1
}
while getopts 'c:k:sb:g:aqh' arg; do
case "$arg" in
c) CONFIG="$OPTARG" ;;
k) KERNELVERSION="$OPTARG" ;;
s) SAVELIST="y" ;;
b) BASEDIR="$OPTARG" ;;
g) GENIMG="$OPTARG" ;;
a) APPEND="y" ;;
q) QUIET="y" ;;
h|?) usage ;;
*) echo "invalid argument '$arg'"; usage ;;
esac
done
shift $(($OPTIND - 1))
# append a trailing / if needed
if [ "${BASEDIR:${#BASEDIR}}" == "/" ]; then
BASEDIR="${BASEDIR:0:${#BASEDIR}-1}"
fi
MODULEDIR="${BASEDIR}/lib/modules/${KERNELVERSION}"
FILELIST=${1:-"initcpio.filelist"}
if [ "x${BASEDIR}" != "x" ]; then
if [ "${BASEDIR:0:1}" != "/" ]; then
echo "base directory '${BASEDIR}' must be an absolute path"
exit 1
elif [ ! -d "${BASEDIR}" ]; then
echo "base directory '${BASEDIR}' does not exist or is not a directory"
exit 1
fi
fi
if [ ! -f "${CONFIG}" ]; then
echo "config file '${CONFIG}' cannot be found, aborting..."
exit 1
fi
source "${CONFIG}"
if [ -f "${FILELIST}" -a "x${APPEND}" == "x" ]; then
echo "destination file list '${FILELIST}' exists - remove before running"
exit 1
elif [ -f "${DESTIMG}" ]; then
echo "destination image '${DESTIMG}' exists - remove before running"
exit 1
else
touch "${FILELIST}"
fi
# Helper functions, just to make syntax clearer
auto_modules ()
{
aliases=$(find /sys/devices/ -name modalias -exec cat {} \;)
modprobe --show-depends -a $aliases 2>/dev/null |\
sed "s|insmod \(.*\)|\1|" | sort -u
}
all_modules ()
{
find ${MODULEDIR} -name *.ko 2>/dev/null | sort -u
}
msg() { [ "${QUIET}" = "n" ] && echo "${@}"; }
err() { [ echo "ERROR: ${@}" >2; }
add_dir()
{
local dir
dir="$(dirname ${1})"
if [ "x${dir}" != "x" -a "${dir}" != "/" ]; then
dir="${dir}" #this got stripped off above... put it back
if ! grep "dir ${dir} " "${FILELIST}" 2>&1 > /dev/null; then
add_dir "${dir}"
msg " adding dir ${dir}"
echo "dir ${dir} 755 0 0" >> "${FILELIST}"
fi
fi
}
# add_devnode /dev/foo type major minor [permissions]
add_devnode()
{
if [ $# -ge 4 ]; then
local perms
perms="${5:-644}"
add_dir "${1}"
if ! grep "nod ${1}" "${FILELIST}" 2>&1 > /dev/null; then
msg " adding device node ${1}"
echo "nod ${1} ${perms} 0 0 ${2} ${3} ${4}" >> "${FILELIST}"
fi
else
err "invalid device node format: $@" >2
return 1
fi
}
add_symlink ()
{
local fil dest dir
if [ -L ${1} ]; then
fil="${1}"
dest="${fil##$BASEDIR}"
add_dir "${dest}"
if ! grep "slink ${fil} " "${FILELIST}" 2>&1 > /dev/null; then
msg " adding symlink ${dest}"
echo "slink ${dest} ${fil} $(stat -c '%a %u %g' ${fil})" >> "${FILELIST}"
fi
else
err "ERROR: file '${1}' is not a symlink" >2
return 1
fi
}
add_file ()
{
local fil lnk dir dest
if [ -e "${1}" ]; then
fil="${1}"
lnk=$(readlink -f "${fil}")
if [ -n "${lnk}" ]; then
add_symlink "${fil}"
fil="${lnk}"
fi
if [ $# -eq 2 ]; then
dest="${2}"
else
dest="${fil##$BASEDIR}"
fi
add_dir "${dest}"
if ! grep "file ${fil} " "${FILELIST}" 2>&1 > /dev/null; then
msg " adding file ${dest}"
echo "file ${dest} ${fil} $(stat -c '%a %u %g' ${fil})" >> "${FILELIST}"
fi
else
err "file '${1}' does not exist" >2
return 1
fi
}
HAS_MODULES="n"
add_module()
{
local fil path mod deps
#cleanup - remove .ko, replace - and _ with [-_] to match either
fil=$(basename "${1}" | sed -e "s|[-_]|\[-_\]|g" -e "s|\.ko$||g")
for path in $(find "${MODULEDIR}" -type f -name "${fil}.ko"); do
for mod in $(modinfo -F depends "${path}" | tr ',' ' '); do
if [ "x${mod}" != "x" ]; then
add_module "${mod}"
HAS_MODULES="y"
fi
done
add_file "${path}"
done
}
add_binary()
{
local bin type lib
bin=$(which "${1}")
if [ $? -ne 0 ]; then
bin="${1}"
fi
if [ ! -f "${bin}" ]; then
err "'${bin}' is not a file" >2
return 1
fi
if [ $? -eq 0 ]; then
type=$(file -b "${bin}")
case "${type}" in
*script*)
msg " adding '${type}' script, ensure proper interp exists..."
add_file "${bin}"
;;
*executable*)
add_file "${bin}"
#note, this will also handle 'not a dynamic executable' spit out by
# static binaries... the deps will produce nothing
for lib in $(ldd ${bin} 2>/dev/null | sed "s|.*=>\(.*\)|\1|"); do
if [ "x${lib}" != "x" ]; then
#remove TLS libraries
notls=$(echo ${lib} | sed 's|/lib/tls.*/\(lib.*\)|/lib/\1|')
[ -e "${notls}" ] && lib="${notls}"
[ -f "${lib}" ] && add_file "${lib}"
fi
done
;;
*)
err "unknown type '${type}' for binary '${bin}'" >2
return 1
;;
esac
fi
}
function parse_hook()
{
local mod bin fil
for mod in $MODULES; do
if [ "x${mod}" != "x" ]; then
add_module "${mod}"
fi
done
for bin in $BINARIES; do
if [ "x${bin}" != "x" ]; then
add_binary "${bin}"
fi
done
for fil in $FILES; do
if [ "x${fil}" != "x" ]; then
add_file "${fil}"
fi
done
}
#parse 'global' hook, as defined in ${CONFIG}
parse_hook
for hook in $HOOKS; do
unset MODULES
unset BINARIES
unset FILES
install () { msg "${hook}: no install function..."; }
source "${HOOKDIR}/${hook}"
install
parse_hook
#quick test to check for existance... need a better way...
# note, this will only pick up valid run_hooks - a space is required
if grep "run_hook ()" "${HOOKDIR}/${hook}" 2>&1>/dev/null; then
add_file "${HOOKDIR}/${hook}" "/hooks/${hook}"
fi
done
if [ "${HAS_MODULES}" == "y" ]; then
add_file "${MODULEDIR}/modules.dep"
add_file "${MODULEDIR}/modules.alias"
add_file "${MODULEDIR}/modules.symbols"
fi
if [ "x$GENIMG" != "x" ]; then
if ! gen_init_cpio ${FILELIST} | gzip -9 > "${GENIMG}"; then
err "ERROR: Failed to create '${GENIMG}' image" >2
fi
if [ "x${SAVELIST}" == "x" ]; then
rm ${FILELIST}
fi
fi
#vim:set ft=sh ts=4 sw=4 noet:
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