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#!/bin/bash
# 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 busybox's ash -
# therefore, the following constraints should be enforced:
# variables should be quoted and bracketed "${SOMEVAR}"
# inline execution should be done with $() instead of backticks
# use -z "${var}" to test for nulls/empty strings
# in case of embedded spaces, quote all path names and string comparisons
#
shopt -s extglob
# Settings
KERNELVERSION=$(uname -r)
CARCH=$(uname -m)
FUNCTIONS=functions
CONFIG=mkinitcpio.conf
HOOKDIR=hooks
INSTDIR=install
PRESETDIR=mkinitcpio.d
COMPRESSION=gzip
declare TMPDIR BASEDIR MODULE_FILE GENIMG PRESET COMPRESSION_OPTIONS BUILDROOT LD_SO
declare NC= BOLD= BLUE= GREEN= RED= YELLOW=
declare -i QUIET=1 SHOW_AUTOMODS=0 SAVELIST=0 COLOR=1
declare -a SKIPHOOKS ADDED_MODULES
# Add /{,usr}/sbin to path
# works around undetected problems like in #8448
PATH=$PATH:/sbin:/usr/sbin
# Sanitize environment further
# GREP_OPTIONS="--color=always" will break everything
unset GREP_OPTIONS
APPNAME=${0##*/}
usage() {
cat <<EOF
usage: $APPNAME [options]
Options:
-b BASEDIR Use BASEDIR. default: /
-c CONFIG Use CONFIG file. default: /etc/mkinitcpio.conf
-g IMAGE Generate a cpio image as IMAGE. default: no
-H HOOKNAME Output help for hook 'HOOKNAME'.
-h Display this message.
-k KERNELVERSION Use KERNELVERSION. default: $(uname -r)
-L List all available hooks.
-M Display modules found via autodetection.
-n Disable colorized output messages.
-p PRESET Build specified preset from /etc/mkinitcpio.d
-S SKIPHOOKS Skip SKIPHOOKS (comma-separated) when building the image.
-s Save build directory. default: no
-t TMPDIR Use TMPDIR as the temporary build directory.
-v Verbose output. Default: no.
-z COMPRESS Use COMPRESS on resulting image
EOF
cleanup
exit 1
}
cleanup ()
{
if [[ $TMPDIR ]]; then
if (( $SAVELIST )); then
msg "build directory saved in %s" "$TMPDIR"
else
rm -rf "$TMPDIR"
fi
fi
}
sighandler() {
cleanup
exit 1
}
get_kernver() {
local kernel=$1
if [[ "${kernel:0:1}" != / ]]; then
echo $kernel
return 0
fi
[[ -r "$kernel" ]] || return 1
read _ kernver < <(file -b "$BASEDIR$kernel" | grep -o 'version [^ ]\+')
if [[ "$kernver" && -e "$BASEDIR/lib/modules/$kernver" ]]; then
echo "$kernver"
return 0
fi
return 1
}
. "$FUNCTIONS"
trap sighandler TERM INT
while getopts ':c:k:sb:g:p:m:nvH:LMhS:t:z:' arg; do
case "${arg}" in
c) CONFIG="${OPTARG}" ;;
k) optkver=$OPTARG ;;
s) SAVELIST=1; ;;
b) BASEDIR="${OPTARG}" ;;
g) GENIMG="${OPTARG}" ;;
h) usage ;;
p) PRESET="${OPTARG}" ;;
n) COLOR=0 ;;
v) QUIET=0 ;;
S) OLDIFS=${IFS}
IFS=,
SKIPHOOKS=(${OPTARG})
IFS=${OLDIFS}
unset OLDIFS
;;
H) if [[ ! -r "${INSTDIR}/${OPTARG}" ]]; then
error "No hook ${OPTARG}"
exit 1
fi
. "${INSTDIR}/${OPTARG}"
if [[ $(type -t help) != function ]]; then
error "No help for hook ${OPTARG}"
exit 1
fi
echo "Help for hook '${OPTARG}':"
help
exit 0 ;;
L) msg "Available hooks"
cd "$INSTDIR" >/dev/null
printf ' %s\n' * | column -c$(tput cols)
exit 0 ;;
M) SHOW_AUTOMODS=1 ;;
t) TMPDIR=$OPTARG ;;
z) optcompress=$OPTARG ;;
:) echo "error: option requires an argument -- '$OPTARG'" >&2
exit 1 ;;
\?) echo "error: invalid option -- '$OPTARG'" >&2
exit 1 ;;
esac
done
shift $((OPTIND - 1))
if [[ -t 2 ]] && (( COLOR )); then
# prefer terminal safe colored and bold text when tput is supported
if tput setaf 0 &>/dev/null; then
NC="$(tput sgr0)"
BOLD="$(tput bold)"
BLUE="$BOLD$(tput setaf 4)"
GREEN="$BOLD$(tput setaf 2)"
RED="$BOLD$(tput setaf 1)"
YELLOW="$BOLD$(tput setaf 3)"
else
NC="\e[1;0m"
BOLD="\e[1;1m"
BLUE="$BOLD\e[1;34m"
GREEN="$BOLD\e[1;32m"
RED="$BOLD\e[1;31m"
YELLOW="$BOLD\e[1;33m"
fi
fi
readonly NC BOLD BLUE GREEN RED YELLOW
if [[ $optkver ]]; then
if ! KERNELVERSION=$(get_kernver "$optkver"); then
die "'$optkver' is an invalid kernel specifier"
fi
fi
if [[ $TMPDIR ]]; then
if [[ ! -d $TMPDIR ]]; then
error "'$TMPDIR' does not exist or is not a directory"
unset TMPDIR
cleanup
exit 1
fi
fi
TMPDIR=$(mktemp -d "${TMPDIR:-/tmp}/mkinitcpio.XXXXXX")
declare BUILDROOT=$TMPDIR/root
# use preset $PRESET
if [[ $PRESET ]]; then
# allow absolute path to preset file, else resolve it
if [[ "${PRESET:0:1}" != '/' ]]; then
printf -v PRESET '%s/%s.preset' "$PRESETDIR" "$PRESET"
fi
if [[ -f "$PRESET" ]]; then
# Use -b, -m and -v options specified earlier
declare -a preset_mkopts preset_cmd
[[ $BASEDIR ]] && preset_mkopts+=(-b "$BASEDIR")
(( QUIET )) || preset_mkopts+=(-v)
# Build all images
. "$PRESET"
for p in "${PRESETS[@]}"; do
msg "Building image from preset: '$p'"
preset_cmd=("${preset_mkopts[@]}")
preset_kver=${p}_kver
if [[ ${!preset_kver:-$ALL_kver} ]]; then
preset_cmd+=(-k "${!preset_kver:-$ALL_kver}")
else
warning "No kernel version specified. Skipping image '%s'" "$p"
continue
fi
preset_config=${p}_config
if [[ ${!preset_config:-$ALL_config} ]]; then
preset_cmd+=(-c "${!preset_config:-$ALL_config}")
else
warning "No configuration file specified. Skipping image '%s'" "$p"
continue
fi
preset_image=${p}_image
if [[ ${!preset_image} ]]; then
preset_cmd+=(-g "$BASEDIR${!preset_image}")
else
warning "No image file specified. Skipping image '%s'" "$p"
continue
fi
preset_options=${p}_options
if [[ ${!preset_options} ]]; then
preset_cmd+=(${!preset_options}) # intentional word splitting
fi
msg2 "${preset_cmd[*]}"
"$0" "${preset_cmd[@]}"
done
cleanup
exit 0
else
die "Preset $PRESET does not exist. Exiting."
fi
fi
if [[ $BASEDIR ]]; then
# resolve the path. it might be a relative path and/or contain symlinks
abspath=$(readlink -e "$BASEDIR")
if [[ -z $abspath ]]; then
die "base directory '$BASEDIR' does not exist or is not a directory"
fi
BASEDIR=$abspath
unset abspath
fi
if [[ $GENIMG ]]; then
IMGPATH=$(readlink -f "$GENIMG")
if [[ -z $IMGPATH || ! -w ${IMGPATH%/*} ]]; then
die "error: unable to write to path: '$GENIMG'"
fi
fi
if [[ ! -f "$CONFIG" ]]; then
die "config file '$CONFIG' cannot be found, aborting..."
fi
. "$CONFIG"
MODULEDIR=$BASEDIR/lib/modules/$KERNELVERSION
if [[ ! -d $MODULEDIR ]]; then
die "'$MODULEDIR' is not a valid kernel module directory"
fi
if (( SHOW_AUTOMODS )); then
msg "Modules autodetected"
. "${INSTDIR}/autodetect"
build
cat "${MODULE_FILE}"
cleanup
exit 0
fi
if [[ -z $GENIMG ]]; then
msg "Starting dry run: %s" "$KERNELVERSION"
else
COMPRESSION=${optcompress:-$COMPRESSION}
if ! type -P "$COMPRESSION" >/dev/null; then
die "Unable to locate compression method: %s" "$optcompress"
fi
msg "Starting build: %s" "$KERNELVERSION"
fi
# set errtrace and a trap to catch errors in parse_hook
declare -i builderrors=0
set -E
trap '[[ $FUNCNAME = parse_hook ]] && (( ++builderrors ))' ERR
#parse 'global' hook, as defined in ${CONFIG}
parse_hook
# resolve the linker and add it
case $CARCH in
i686) LD_SO=("$BASEDIR"/lib/ld-linux.so.?*) ;;
x86_64) LD_SO=("$BASEDIR"/lib/ld-linux-${CARCH//_/-}.so.?*) ;;
*) die "unknown architecture: $CARCH" ;;
esac
if (( ${#LD_SO[*]} != 1 )); then # uh oh...
die "failed to resolve the location of /lib/ld.so. Please report this bug."
fi
resolved=$(readlink -e "$LD_SO")
_add_dir "${resolved%/*}" 755
_add_symlink "${LD_SO#$BASEDIR}" "${resolved#$BASEDIR}"
_add_file "${resolved#$BASEDIR}" "${resolved#$BASEDIR}" 755
unset resolved
for hook in ${HOOKS}; do
in_array "$hook" "${SKIPHOOKS[@]}" && continue
unset MODULES BINARIES FILES SCRIPT
build () { error "$hook: no build function..."; }
# A hook is considered deprecated if it is a symlink within $INSTDIR.
if [[ -L "$INSTDIR/$hook" ]]; then
newhook=$(readlink -e "$INSTDIR/$hook")
if [[ $newhook && "$INSTDIR/${newhook##*/}" -ef "$newhook" ]]; then
newhook=${newhook##*/}
warning "Hook '%s' is deprecated. Replace it with '%s' in your config" "$hook" "$newhook"
hook=$newhook
fi
fi
if [[ -r "${INSTDIR}/${hook}" ]]; then
. "${INSTDIR}/${hook}"
msg2 "Parsing hook: [%s]" "$hook"
if [[ $(type -t install) = 'function' ]]; then
warning "Hook '%s' uses a deprecated 'install' function. This should be renamed 'build'" "$hook"
install
unset install
else
build
fi
parse_hook
else
die "Hook '$hook' can not be found."
fi
done
# unset errtrace and trap
set +E
trap ERR
if (( ${#ADDED_MODULES[*]} )); then
msg "Generating module dependencies"
/sbin/depmod -b "${TMPDIR}/root" "${KERNELVERSION}"
rm "$BUILDROOT/lib/modules/$KERNELVERSION"/modules.!(dep.bin|alias.bin|symbols.bin)
fi
declare -i status=0
declare -a pipesave
if [[ "${GENIMG}" ]]; then
msg "Creating $COMPRESSION initcpio image: %s" "$GENIMG"
[[ "$COMPRESSION" = xz ]] && COMPRESSION_OPTIONS+=" --check=crc32"
pushd "$BUILDROOT" >/dev/null
find . -print0 | bsdcpio -0oH newc | $COMPRESSION $COMPRESSION_OPTIONS > "$IMGPATH"
pipesave=("${PIPESTATUS[@]}") # save immediately
popd >/dev/null
if (( pipesave[0] )); then
errmsg="find reported an error"
elif (( pipesave[1] )); then
errmsg="bsdcpio reported an error"
elif (( pipesave[2] )); then
errmsg="$COMPRESSION reported an error"
fi
if (( builderrors )); then
warning "errors were encountered during the build. The image may not be complete."
status=1
fi
if [[ $errmsg ]]; then
error "Image generation FAILED: %s\n" "$errmsg"
status=1
else
msg "Image generation successful"
fi
else
msg "Dry run complete, use -g IMAGE to generate a real image"
fi
cleanup
exit ${status}
# vim: set ft=sh ts=4 sw=4 et:
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