implement parse_args, refactor
This commit is contained in:
illiliti
parent
5122f01e10
commit
a519d29e19
205
generate
205
generate
@ -2,8 +2,8 @@
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#
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# tiny initramfs generation tool
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# print message
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msg() {
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# print message
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case "$1" in
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info)
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printf "info >> %s\n" "$2" >&2
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@ -20,8 +20,42 @@ msg() {
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esac
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}
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usage() {
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cat << EOF
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usage: $0 [options]
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-o, --output <file> output file. default is $(readlink -f $(dirname "$0"))/initramfs-$(uname -r)
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-f, --files <dir> files directory. default is $(readlink -f $(dirname "$0"))
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EOF
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}
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parse_args() {
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while [ "$1" ]; do
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case "$1" in
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-o | --output)
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initramfs="$2"
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shift 2
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;;
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-f | --files)
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filesdir="$2"
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shift 2
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;;
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-h | --help)
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usage
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exit 0
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;;
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*)
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printf "%s\n\n" "invalid option: '$1'"
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usage
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exit 1
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;;
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esac
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done
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}
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create_wrkdir() {
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msg info "creating working directory"
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if [ "$XDG_CACHE_HOME" ]; then
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wrkdir="${XDG_CACHE_HOME}/initramfs.$$"
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elif [ "$TMPDIR" ]; then
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@ -35,23 +69,15 @@ create_wrkdir() {
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remove_wrkdir() {
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msg info "removing working directory"
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rm -rf "$wrkdir"
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}
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# change current directory to script directory if user haven't do it
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check_currentdir() {
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scriptdir=$(readlink -f $(dirname "$0"))
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[ "$PWD" = "$scriptdir" ] || {
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msg info "changing current directory to script directory"
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cd "$scriptdir" || msg panic "failed to change directory"
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}
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rm -rf "$wrkdir"
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}
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install_requirements() {
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msg info "installing requirements"
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# install user specified binaries
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[ "$binaries" ] && install_binary "$binaries"
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[ "$binaries" ] && install_binary "$binaries"
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# install util-linux binaries
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[ "$util_linux" = 1 ] && install_binary mount blkid
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@ -62,17 +88,20 @@ install_requirements() {
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create_structure() {
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msg info "creating directory structure"
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for dir in dev tmp var run etc usr/lib usr/bin mnt/root proc root sys; do
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mkdir -p "${wrkdir}/${dir}"
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done
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}
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# some dynamically linked libraries and binaries compiled with hardcoded
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# dependencies path. to make it worked we need create symlinks for them.
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# also POSIX ln doesn't have --relative flag like in GNU ln. as workaround
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# we change directory to wrkdir and make needed symlinks.
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create_symlinks() {
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# some dynamically linked libraries and binaries compiled with hardcoded
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# dependencies path. to make it worked we need create symlinks for them.
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# also POSIX ln doesn't have --relative flag like in GNU ln. as workaround
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# we change directory to wrkdir and make needed symlinks.
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msg info "creating symlinks"
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( cd "$wrkdir" && {
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ln -s usr/lib lib
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ln -s usr/lib lib64
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@ -85,40 +114,25 @@ create_symlinks() {
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} )
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}
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parse_fstab() {
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msg info "parsing fstab"
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while read -r fs dir type opts dump pass; do
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# ignore comments
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if [ ! "${fs##"#"*}" ]; then
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continue
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elif [ "$dir" = / ]; then
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root="${root:-$fs}"
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root_type="${root_type:-$type}"
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root_opts="${root_opts:-$opts}"
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fi
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done < /etc/fstab
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}
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#parse_crypttab() {
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# TODO parse crypttab
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#}
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install_mdev() {
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msg info "installing mdev"
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install -m644 mdev.conf -t "${wrkdir}/etc"
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install -m644 mdev.conf -t "${wrkdir}/etc"
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install -Dm755 storage-device -t "${wrkdir}/lib/mdev"
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}
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install_mdevd() {
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msg info "installing mdevd"
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install_binary mdevd mdevd-coldplug
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install -m644 mdev.conf -t "${wrkdir}/etc"
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install -m644 mdev.conf -t "${wrkdir}/etc"
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install -Dm755 storage-device -t "${wrkdir}/lib/mdev"
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}
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install_udev() {
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msg info "installing udev"
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install_binary udevd udevadm dmsetup
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# FIXME rewrite this piece of crap
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find /usr/lib/udev -type f | grep -v "rc_keymaps\|hwdb.d" | cpio -pd "$wrkdir" > /dev/null 2>&1
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@ -126,6 +140,7 @@ install_udev() {
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install_lvm() {
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msg info "installing LVM"
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install_binary lvm
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lvm_drivers="dm-thin-pool dm-multipath dm-snapshot dm-cache dm-log dm-mirror"
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@ -152,6 +167,7 @@ EOF
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install_luks() {
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msg info "installing LUKS"
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install_binary cryptsetup
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luks_drivers="aes dm-crypt sha256 sha512 wp512 ecb lrw xts twofish serpent"
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@ -161,6 +177,7 @@ install_luks() {
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mkdir "${wrkdir}/run/cryptsetup"
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# TODO get rid of this workaround
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# TODO fix static binary
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# workaround for luks2
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install -s -m755 /usr/lib/libgcc_s.so.1 -t "${wrkdir}/usr/lib" || msg panic "failed to install LUKS libraries"
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@ -179,15 +196,22 @@ install_luks() {
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install_driver() {
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# check monolithic kernel(builtin drivers)
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[ -d "${moddir}/${kernel}" ] || return 0
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[ -d "${moddir}/${kernel}" ] || return
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# we need splitting
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# shellcheck disable=SC2068
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for driver in $@; do
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# strip path and extension
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driver="${driver##*/}"
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driver="${driver%%.*}"
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# TODO busybox modprobe doesn't support -S option
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modprobe -S "$kernel" -D "$driver" 2> /dev/null | grep -v builtin | cut -d " " -f 2 | while read -r driver_dep; do
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modprobe -S "$kernel" -D "$driver" 2> /dev/null |
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grep -v "builtin\|net" |
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cut -d " " -f 2 |
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while read -r driver_dep; do
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install -Dm644 "$driver_dep" "${wrkdir}${driver_dep}"
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done
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done
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@ -195,6 +219,7 @@ install_driver() {
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install_hostonly_drivers() {
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msg info "installing hostonly drivers"
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[ "$root_type" ] || msg panic "hostonly mode required root_type option to be configured"
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# perform autodetection of drivers via /sys
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@ -211,6 +236,7 @@ install_hostonly_drivers() {
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install_all_drivers() {
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msg info "installing all drivers"
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modker="${moddir}/${kernel}/kernel"
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install_driver \
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@ -231,51 +257,74 @@ install_all_drivers() {
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generate_depmod() {
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msg info "running depmod"
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modker="${moddir}/${kernel}"
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cp "${modker}/modules.builtin" "${modker}/modules.order" "${wrkdir}/${modker}"
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depmod -b "$wrkdir" "$kernel"
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}
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# TODO make strip optional
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install_binary() {
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# TODO make strip optional
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# we need splitting
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# shellcheck disable=SC2068
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for binary in $@; do
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msg info "installing binary $binary"
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fullbin=$(command -v "$binary")
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# check binary existence
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command -v "$binary" > /dev/null 2>&1 || msg panic "$binary doesn't exists"
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[ "$fullbin" ] || msg panic "$binary doesn't exists"
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# install and strip binary
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install -s -m755 "$(command -v $binary)" -t "${wrkdir}/usr/bin"
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install -s -m755 "$fullbin" -t "${wrkdir}/usr/bin"
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# check statically linking
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ldd "$(command -v $binary)" > /dev/null 2>&1 || continue
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# check static
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ldd "$fullbin" > /dev/null 2>&1 || continue
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# install libraries
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install_library "$binary"
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done
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}
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# TODO make strip optional
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install_library() {
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ldd "$(command -v $1)" | sed -nre 's,.* (/.*lib.*/.*.so.*) .*,\1,p' -e 's,.*(/lib.*/ld.*.so.*) .*,\1,p' | while read -r library; do
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# TODO make strip optional
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wrkdirlib="${wrkdir}/usr/lib/"
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# extract paths to libraries from ldd output
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ldd $(command -v "$1") |
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sed -nr \
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-e 's,.* (/.*lib.*/.*.so.*) .*,\1,p' \
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-e 's,.*(/lib.*/ld.*.so.*) .*,\1,p' |
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while read -r library; do
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namelib="${library##*/}"
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reallib=$(readlink "$library")
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fulllib=$(readlink -f "$library")
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# check symlink
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if [ -h "$library" ]; then
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# check lib already existence
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if [ ! -e "${wrkdir}/usr/lib/${library##*/}" ] && [ ! -e "${wrkdir}/$(readlink -f $library)" ]; then
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[ -e "${wrkdirlib}${namelib}" ] ||
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[ -e "${wrkdir}${fulllib}" ] ||
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{
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# regular
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install -s -m755 "$(readlink -f $library)" -t "${wrkdir}/usr/lib"
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install -s -m755 "${fulllib}" -t "${wrkdirlib}"
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# FIXME handle all symlinks
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# symlink may link to symlink
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[ -h "/usr/lib/$(readlink $library)" ] && cp -a "/usr/lib/$(readlink $library)" "${wrkdir}/usr/lib"
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[ -h "/usr/lib/${reallib}" ] &&
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cp -a "/usr/lib/${reallib}" "${wrkdirlib}"
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# symlink
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cp -a "$library" "${wrkdir}/usr/lib"
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fi
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cp -a "$library" "${wrkdirlib}"
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}
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else
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if [ ! -e "${wrkdir}/usr/lib/${library##*/}" ]; then
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install -s -m755 "$library" -t "${wrkdir}/usr/lib"
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fi
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[ -e "${wrkdirlib}${namelib}" ] ||
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install -s -m755 "$library" -t "${wrkdirlib}"
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fi
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done
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}
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@ -283,8 +332,27 @@ install_library() {
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install_files() {
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msg info "installing files"
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# initialize config
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sed -e "/^#/d" -e "/^$/d" ./config > "${wrkdir}/config"
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cat << EOF > "${wrkdir}/config"
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debug="$debug"
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init="$init"
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root="$root"
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root_type="$root_type"
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root_opts="$root_opts"
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devmgr="$devmgr"
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#drivers
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lvm="$lvm"
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lvm_name="$lvm_name"
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lvm_group="$lvm_group"
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#lvm_discard
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lvm_args="$lvm_args"
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luks="$luks"
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luks_root="$luks_root"
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luks_name="$luks_name"
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#luks_header
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#luks_keyfile
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luks_discard="$luks_discard"
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luks_args="$luks_args"
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EOF
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# needed for devmgr
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cat << EOF > "${wrkdir}/etc/group"
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@ -311,10 +379,9 @@ nobody:x:99:99::/:/bin/false
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EOF
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# install init script
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install -m755 ./init -t "$wrkdir"
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install -m755 "${filesdir}/init" -t "$wrkdir"
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}
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# create and compress cpio archive
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create_initramfs() {
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msg info "creating initramfs image"
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{
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@ -322,7 +389,7 @@ create_initramfs() {
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cd "$wrkdir"
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find . | cpio -oH newc | ${compress:-gzip -9}
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) | tee "${scriptdir}/${initramfs:=initramfs-${kernel}}"
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) | tee "${initramfs:-${filesdir}/initramfs-${kernel}}"
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} > /dev/null 2>&1 || msg panic "failed to generate initramfs image"
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}
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@ -330,29 +397,26 @@ create_initramfs() {
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# check root
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[ "$(id -u)" = 0 ] || msg panic "must be run as root"
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create_wrkdir
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parse_args "$@"
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. "${filesdir:=$(readlink -f $(dirname "$0"))}/config" || msg panic "failed to source config"
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# remove wrkdir on exit or unexpected error
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trap remove_wrkdir EXIT INT
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check_currentdir
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. ./config || msg panic "failed to source config"
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[ "$shell_debug" = 1 ] && {
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[ "$debug" = 1 ] && {
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# debug shell commands
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set -x
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# don't remove anything
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trap : EXIT INT
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trap - EXIT INT
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}
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kernel="${kernel:-$(uname -r)}"
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moddir="/lib/modules"
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create_wrkdir
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create_structure
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create_symlinks
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[ "$fstab" = 1 ] && [ -f /etc/fstab ] && parse_fstab
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#parse_crypttab
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install_requirements
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if [ "$hostonly" = 1 ]; then
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@ -364,16 +428,15 @@ fi
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generate_depmod
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case "$devmgr" in
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udev) install_udev ;;
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mdev) install_mdev ;;
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mdevd) install_mdevd ;;
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udev) install_udev ;;
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*) msg panic "devmgr option broken" ;;
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esac
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[ "$lvm" = 1 ] && [ -x "$(command -v lvm)" ] && install_lvm
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[ "$luks" = 1 ] && [ -x "$(command -v cryptsetup)" ] && install_luks
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[ "$lvm" = 1 ] && [ -x "$(command -v lvm)" ] && install_lvm
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install_files
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create_initramfs
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msg info "done! check out $initramfs"
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msg info "done! check out ${initramfs:-${filesdir}/initramfs-${kernel}}"
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17
init
17
init
@ -9,15 +9,14 @@ panic() {
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}
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parse_cmdline() {
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# store cmdline in variable
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read -r cmdline < /proc/cmdline || panic "failed to parse cmdline"
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# turn variable into list
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set -- $cmdline
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# turn output into list
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set -- $(cat /proc/cmdline)
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# parse line by line
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for line in "$@"; do
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# parse options
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case "${line%%=*}" in
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debug) debug="${line##*=}" ;;
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init) init="${line##*=}" ;;
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root) root="${line##*=}" ;;
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root.type) root_type="${line##*=}" ;;
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@ -31,8 +30,6 @@ parse_cmdline() {
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luks.name) luks_name="${line##*=}" ;;
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luks.discard) luks_discard="${line##*=}" ;;
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luks.args) luks_args="${line##*=}" ;;
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shell.debug) shell_debug="${line##*=}" ;;
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shell.break) shell_break="${line##*=}" ;;
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# TODO implement
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#lvm.discard) ;;
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#lvm.conf) ;;
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@ -147,7 +144,7 @@ mnt_pseudofs
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parse_cmdline
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# debug mode
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[ "$shell_debug" = 1 ] && set -x
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[ "$debug" = 1 ] && set -x
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case "$devmgr" in
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mdev) setup_mdev ;;
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@ -157,9 +154,9 @@ case "$devmgr" in
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esac
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# TODO handle situations when LUKS on LVM
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[ "$luks" = 1 ] && [ -x "$(command -v cryptsetup)" ] && unlock_luks
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[ "$lvm" = 1 ] && [ -x "$(command -v lvm)" ] && trigger_lvm
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[ "$luks" = 1 ] && [ -x "$(command -v cryptsetup)" ] && unlock_luks
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[ "$lvm" = 1 ] && [ -x "$(command -v lvm)" ] && trigger_lvm
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mnt_rootfs
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[ "$shell_break" = 1 ] && panic "dropping to shell"
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[ "$debug" = 1 ] && panic "dropping to shell"
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cleanup
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boot_system
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