tinyramfs/generate

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#!/bin/sh
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#
# tiny initramfs generation tool
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# print message
msg() {
case "$1" in
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info)
printf "info >> %s\n" "$2" >&2
;;
warn)
printf "warning >> %s\n" "$2" >&2
printf "do you want to continue? press enter or ctrl+c to exit\n"
read -r _
;;
panic)
printf "panic >> %s\n" "$2" >&2
exit 1
;;
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esac
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}
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# create tmpdir
create_tmpdir() {
if [ -n "$XDG_CACHE_HOME" ]; then
tmpdir="${XDG_CACHE_HOME}/initramfs.$$"
mkdir "$tmpdir"
printf "%s\n" "$tmpdir"
elif [ -n "$TMPDIR" ]; then
tmpdir="${TMPDIR}/initramfs.$$"
mkdir "$tmpdir"
printf "%s\n" "$tmpdir"
else
tmpdir="/tmp/initramfs.$$"
mkdir "$tmpdir"
printf "%s\n" "$tmpdir"
fi
}
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# remove tmpdir
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remove_tmpdir() {
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msg info "removing work dir"
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rm -rf "$tmpdir"
}
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# change current directory to script directory if user haven't do it
check_currentdir() {
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script_dir=$(dirname "$0")
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[ "$PWD" = "$script_dir" ] || {
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msg info "changing directory to script dir"
cd "$script_dir" || msg panic "failed to change directory"
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}
}
# check needed files
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check_requirements() {
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msg info "checking requirements"
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# check busybox installed
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if command -v busybox > /dev/null 2>&1; then
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# check busybox supports CONFIG_FEATURE_INSTALLER
busybox --help | grep -q "\-\-install \[\-s\]" || msg panic "recompile busybox with CONFIG_FEATURE_INSTALLER"
# check requirements for init
for busybox_dep in mdev uevent switch_root; do
busybox $busybox_dep --help > /dev/null 2>&1 || msg panic "recompile busybox with $busybox_dep"
done
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else
msg panic "busybox doesn't installed"
fi
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# check kmod modprobe installed
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if command -v modprobe > /dev/null 2>&1; then
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# busybox modprobe doesn't supported(yet)
modprobe --version 2>&1 | grep -q "kmod" || msg panic "kmod modprobe version doesn't installed"
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else
msg panic "modprobe doesn't installed"
fi
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# check util-linux tools
[ "$use_util_linux" = 1 ] && {
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# check mount installed
if command -v mount > /dev/null 2>&1; then
mount --version 2>&1 | grep -q "util-linux" || {
msg warning "util-linux mount version doesn't installed. PARTUUID and filesystem type autodetection support will be missing"
use_util_linux=0
}
else
msg panic "mount doesn't installed"
fi
# check blkid installed
if command -v blkid > /dev/null 2>&1; then
blkid --version 2>&1 | grep -q "util-linux" || {
msg warning "util-linux blkid version doesn't installed. PARTUUID support will be missing"
use_util_linux=0
}
else
msg panic "blkid doesn't installed"
fi
}
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}
# install requirements
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install_requirements() {
msg info "installing requirements"
# install user specified binaries
[ -n "$binaries" ] && install_binaries $binaries
# install util-linux binaries
[ "$use_util_linux" = 1 ] && install_binaries mount blkid
# install mandatory binaries
install_binaries busybox modprobe
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}
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# create FHS directory structure
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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 "${tmpdir}/${dir}"
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done
}
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# some dynamically linked libraries and binaries compiled with hardcoded
# dependencies path. to make it worked we need create symlinks for them.
# also POSIX ln doesn't have --relative flag like in GNU ln. as workaround
# we change directory to tmpdir and make needed symlinks.
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create_symlinks() {
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msg info "creating symlinks"
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( cd "$tmpdir" && {
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ln -s usr/lib lib
ln -s usr/lib lib64
ln -s usr/bin bin
ln -s usr/bin sbin
ln -s ../run var/run
cd "${tmpdir}/usr"
ln -s bin sbin
ln -s lib lib64
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} )
}
#parse_fstab() {
# TODO parse fstab
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#while [ "$use_fstab" -eq 1 ] && read fs dir type opts; do thing; done < /etc/fstab
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#}
#parse_crypttab() {
# TODO parse crypttab
#}
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# install mdev
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install_mdev() {
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msg info "installing mdev"
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install -m644 mdev.conf -t "${tmpdir}/etc"
install -Dm755 storage-device -t "${tmpdir}/lib/mdev"
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}
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# install mdevd
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install_mdevd() {
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msg info "installing mdevd"
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install_binaries mdevd mdevd-coldplug
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install -m644 mdev.conf -t "${tmpdir}/etc"
install -Dm755 storage-device -t "${tmpdir}/lib/mdev"
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}
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# install udev
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install_udev() {
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msg info "installing udev"
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install_binaries udevd udevadm dmsetup
# FIXME rewrite this piece of crap
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find /usr/lib/udev -type f | grep -v "rc_keymaps\|hwdb.d" | cpio -pd "$tmpdir" > /dev/null 2>&1
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}
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# handle lvm
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install_lvm() {
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msg info "installing LVM"
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install_binaries lvm
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# if hostonly mode enabled install only needed drivers
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[ "$hostonly" = 1 ] && install_drivers dm-thin-pool dm-multipath dm-snapshot dm-cache dm-log dm-mirror
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if [ "$lvm_conf" = 1 ]; then
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install -Dm644 /etc/lvm/*.conf -t "${tmpdir}/etc/lvm" || msg panic "failed to install LVM config"
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else
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mkdir "${tmpdir}/etc/lvm"
cat << EOF > "${tmpdir}/etc/lvm/lvm.conf"
devices {
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issue_discards = ${lvm_discard:-0}
}
global {
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use_lvmetad = 0
}
EOF
fi
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}
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# handle luks
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install_luks() {
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msg info "installing LUKS"
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install_binaries cryptsetup
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# if hostonly mode enabled install only needed drivers
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[ "$hostonly" = 1 ] && install_drivers aes dm-crypt sha256 sha512 wp512 ecb lrw xts twofish serpent
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# avoid locking directory missing warning message
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mkdir "${tmpdir}/run/cryptsetup"
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# TODO get rid of this workaround
# workaround for luks2
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install -s -m755 /usr/lib/libgcc_s.so.1 -t "${tmpdir}/usr/lib" || msg panic "failed to install LUKS libraries"
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# block discard support
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[ "$luks_discard" = 1 ] && luks_args="--allow-discards $luks_args"
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# copy luks header
[ -f "$luks_header" ] && {
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install -m400 "$luks_header" "${tmpdir}/root/luks_header" || msg panic "failed to copy LUKS header"
luks_args="--header=/root/luks_header $luks_args"
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}
# copy luks keyfile
[ -f "$luks_keyfile" ] && {
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install -m400 "$luks_keyfile" "${tmpdir}/root/luks_keyfile" || msg panic "failed to copy LUKS keyfile"
luks_args="--key-file=/root/luks_keyfile $luks_args"
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}
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}
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# install drivers and deps
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install_drivers() {
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printf "%s\n" "$@" | while read -r driver; do
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# strip path and extension
driver="${driver##*/}"
driver="${driver%%.*}"
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for driver_dep in $(modprobe -D "$driver" 2> /dev/null | grep -v builtin | cut -d " " -f 2); do
install -Dm644 "$driver_dep" "${tmpdir}${driver_dep}"
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done
done
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# TODO implement monolithic kernel support
[ -e "${tmpdir}/lib/modules" ] || msg panic "failed to install drivers"
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}
# install hostonly drivers
install_hostonly_drivers() {
msg info "installing hostonly drivers"
[ -n "$root_type" ] || msg panic "hostonly mode required root_type option to be configured"
# perform autodetection of drivers via /sys
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install_drivers $(find /sys -name modalias -exec sort -u "{}" "+")
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# TODO autodetect root fs driver
# TODO separate root type option
# install root fs driver
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install_drivers "$root_type"
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# install user specified drivers
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[ -n "$drivers" ] && install_drivers "$drivers"
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}
# find and install all drivers
install_all_drivers() {
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msg info "installing all drivers"
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modker="${moddir}/${kernel}/kernel"
install_drivers \
$(find \
"${modker}/arch" \
"${modker}/crypto" \
"${modker}/fs" \
"${modker}/lib" \
"${modker}/drivers/block" \
"${modker}/drivers/ata" \
"${modker}/drivers/md" \
"${modker}/drivers/scsi" \
"${modker}/drivers/usb/storage" \
"${modker}/drivers/usb/host" \
"${modker}/drivers/virtio" \
-type f 2> /dev/null)
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modker="${moddir}/${kernel}"
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}
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# generate "modules" files
generate_depmod() {
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msg info "generating dependendies list of drivers"
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# install list of drivers
cp "${modker}/modules.softdep" "${modker}/modules.builtin" "${modker}/modules.order" "${tmpdir}/${modker}"
# generate dependencies list of drivers
depmod -b "$tmpdir" "$kernel"
}
# TODO make strip optional
# handle binaries
install_binaries() {
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printf "%s\n" "$@" | while read -r binary; do
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msg info "installing binary $binary"
# check binary existence
command -v "$binary" > /dev/null 2>&1 || msg panic "$binary doesn't exists"
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# install and strip binary
install -s -m755 "$(command -v $binary)" -t "${tmpdir}/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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# install libraries
install_libraries $binary
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done
}
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# TODO make strip optional
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# handle libraries
install_libraries() {
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for library in $(ldd "$(command -v $1)" | sed -nre 's,.* (/.*lib.*/.*.so.*) .*,\1,p' -e 's,.*(/lib.*/ld.*.so.*) .*,\1,p'); do
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msg info "installing library $library"
# check symlink
if [ -h "$library" ]; then
# check lib already existence
if [ ! -e "${tmpdir}/usr/lib/${library##*/}" ] && [ ! -e "${tmpdir}/$(readlink -f $library)" ]; then
# regular
install -s -m755 "$(readlink -f $library)" -t "${tmpdir}/usr/lib"
# FIXME handle all symlinks
# symlink may link to symlink
[ -h "/usr/lib/$(readlink $library)" ] && cp -a "/usr/lib/$(readlink $library)" "${tmpdir}/usr/lib"
# symlink
cp -a "$library" "${tmpdir}/usr/lib"
fi
else
if [ ! -e "${tmpdir}/usr/lib/${library##*/}" ]; then
install -s -m755 "$library" -t "${tmpdir}/usr/lib"
fi
fi
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done
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}
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# install important files used by init
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install_files() {
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msg info "installing files"
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# FIXME eof broken
# initialize config
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cat << EOF > "${tmpdir}/config"
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debug="$debug"
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root="$root"
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root_type="$root_type"
root_args="$root_args"
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devmgr="$devmgr"
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#drivers="$drivers"
use_lvm="$use_lvm"
use_luks="$use_luks"
luks_root="$luks_root"
luks_args="$luks_args"
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EOF
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# needed for devmgr
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cat << EOF > "${tmpdir}/etc/group"
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root:x:0:
tty:x:5:
dialout:x:11:
uucp:x:14:
kmem:x:3:
input:x:25:
video:x:13:
audio:x:12:
lp:x:10:
disk:x:9:
cdrom:x:16:
tape:x:6:
kvm:x:24:
floppy:x:8:
EOF
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# needed for devmgr
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cat << EOF > "${tmpdir}/etc/passwd"
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root:x:0:0::/root:/bin/sh
nobody:x:99:99::/:/bin/false
EOF
# install init script
install -m755 ./init -t "$tmpdir"
}
# TODO add more compession tools
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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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(
cd "$tmpdir"
find . \
| cpio -oH newc \
| gzip -9
) \
| tee "${script_dir}/initramfs-${kernel}.img.gz"
} > /dev/null 2>&1 || msg panic "failed to generate initramfs image"
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}
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# check root
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[ "$(id -u)" = 0 ] || msg panic "must be run as root"
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# remove tmpdir on exit or unexpected error
trap remove_tmpdir EXIT INT
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check_currentdir
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# source config
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. ./config || msg panic "./config doesn't exists"
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# handle debug mode
[ "$debug" = 1 ] && {
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# debug shell commands
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set -x
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# don't remove anything
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trap : EXIT INT
}
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# variables
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tmpdir="$(create_tmpdir)" || msg panic "failed to create working directory"
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kernel="${kernel:-$(uname -r)}"
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moddir="/lib/modules"
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check_requirements
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create_structure
create_symlinks
#parse_fstab
#parse_crypttab
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install_requirements
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if [ "$hostonly" = 1 ]; then
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install_hostonly_drivers
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else
install_all_drivers
fi
generate_depmod
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# handle device manager
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case "$devmgr" in
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mdev) install_mdev ;;
mdevd) install_mdevd ;;
udev) install_udev ;;
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*) msg panic "devmgr option broken" ;;
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esac
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[ "$use_luks" = 1 ] && install_luks
[ "$use_lvm" = 1 ] && install_lvm
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install_files
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create_initramfs
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msg info "done! check out initramfs-${kernel}.img.gz"