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
warn)
printf "warning >> %s\n" "$2"
;;
info)
printf "info >> %s\n" "$2"
;;
panic)
printf "panic >> %s\n" "$2"
exit 1
;;
esac
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}
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# remove tmpdir
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remove_tmpdir() {
rm -rf "$tmpdir"
}
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# change current directory to script directory if user haven't do it
check_currentdir() {
script_dir=$(dirname $(readlink -f -- "$0"))
[ "$PWD" = "$script_dir" ] || {
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cd "$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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# TODO use system busybox
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for f in ./init ./busybox; do
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[ -e "$f" ] || msg panic "$f doesn't exists"
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done
# TODO handle busybox requirements ( busybox --list | grep ash )
}
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# create FHS directory structure
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create_structure() {
for d in dev tmp var run etc usr/lib usr/bin mnt/root proc root sys; do
mkdir -p "${tmpdir}/${d}"
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() {
( cd "$tmpdir" && {
ln -s usr/lib lib
ln -s usr/lib lib64
ln -s usr/bin bin
ln -s usr/bin sbin
ln -s ../run var/run
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cd "${tmpdir}/usr"
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ln -s bin sbin
ln -s lib lib64
} )
}
#parse_fstab() {
# TODO parse fstab
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#while [ "$use_fstab" -eq 1 ] && read fs dir type opts; do thing; done < /etc/fstab
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#}
#parse_crypttab() {
# TODO parse crypttab
#}
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# install mdev
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install_mdev() {
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install -m644 mdev.conf -t "${tmpdir}/etc"
install -Dm755 storage-device -t "${tmpdir}/lib/mdev"
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}
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# install mdevd
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install_mdevd() {
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install_binaries mdevd mdevd-coldplug
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install -m644 mdev.conf -t "${tmpdir}/etc"
install -Dm755 storage-device -t "${tmpdir}/lib/mdev"
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}
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# install udev
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install_udev() {
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install_binaries udevd udevadm dmsetup
# FIXME rewrite this piece of crap
find /usr/lib/udev -type f | grep -v "rc_keymaps\|hwdb.d" | cpio -pd "$tmpdir" >/dev/null 2>&1
}
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# handle lvm
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install_lvm() {
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install_binaries lvm
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# if hostonly mode enabled install only needed drivers
[ "$hostonly" = 1 ] && {
for lvm_driver in dm-thin-pool dm-multipath dm-snapshot dm-cache dm-log dm-mirror; do
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for lvm_driver_dep in $(modprobe -D "$lvm_driver" 2>/dev/null | grep -v builtin | cut -d " " -f 2); do
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install -Dm644 "$lvm_driver_dep" "${tmpdir}${lvm_driver_dep}" 2>/dev/null
done
done
}
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# FIXME this code doesn't working with udev
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#mkdir "$tmpdir/etc/lvm"
# use_lvmetad = 0 - avoid lvmetad missing warning message
#cat <<EOF > "$tmpdir/etc/lvm/lvmlocal.conf"
#local {
# issue_discards = ${lvm_discard:-0}
# use_lvmetad = 0
#}
#EOF
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# TODO implement use_lvmconf
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}
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# handle luks
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install_luks() {
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install_binaries cryptsetup
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# if hostonly mode enabled install only needed drivers
[ "$hostonly" = 1 ] && {
for luks_driver in aes dm-crypt sha256 sha512 wp512 ecb lrw xts twofish serpent; do
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for luks_driver_dep in $(modprobe -D "$luks_driver" 2>/dev/null | grep -v builtin | cut -d " " -f 2); do
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install -Dm644 "$luks_driver_dep" "${tmpdir}${luks_driver_dep}" 2>/dev/null
done
done
}
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# avoid locking directory missing warning message
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mkdir "${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 "${tmpdir}/usr/lib"
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# block discard support
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[ "$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"
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luks_args="--header=/root/luks_header $luks_args"
}
# copy luks keyfile
[ -f "$luks_keyfile" ] && {
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install -m400 "$luks_keyfile" "${tmpdir}/root/luks_keyfile"
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luks_args="--key-file=/root/luks_keyfile $luks_args"
}
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}
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# install drivers
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install_drivers() {
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[ -n "$root_type" ] || msg panic "hostonly mode required root_type option to be configured"
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# perform autodetection of drivers via /sys
for driver in $(find /sys/devices -name modalias -exec sort -u "{}" "+"); do
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for driver_dep in $(modprobe -D "$driver" 2>/dev/null | grep -v builtin | cut -d " " -f 2); do
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install -Dm644 "$driver_dep" "${tmpdir}${driver_dep}" 2>/dev/null
done
done
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# TODO autodetect root fs driver
# TODO separate root type option
# install root fs driver
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for root_driver in $(modprobe -D "$root_type" 2>/dev/null | grep -v builtin | cut -d " " -f 2); do
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install -Dm644 "$root_driver" "${tmpdir}${root_driver}" 2>/dev/null
done
# install user specified drivers
[ -n "$drivers" ] && {
for custom_driver in $(printf "%s\n" "$drivers" | tr " " "\n"); do
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for custom_driver_dep in $(modprobe -D "$custom_driver" 2>/dev/null | grep -v builtin | cut -d " " -f 2); do
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install -Dm644 "$custom_driver_dep" "${tmpdir}${custom_driver_dep}" 2>/dev/null
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done
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done
}
}
# find and install all drivers
install_all_drivers() {
find \
"${modker}/kernel/arch" \
"${modker}/kernel/crypto" \
"${modker}/kernel/fs" \
"${modker}/kernel/lib" \
"${modker}/kernel/drivers/block" \
"${modker}/kernel/drivers/ata" \
"${modker}/kernel/drivers/md" \
"${modker}/kernel/drivers/scsi" \
"${modker}/kernel/drivers/usb/storage" \
"${modker}/kernel/drivers/usb/host" \
"${modker}/kernel/drivers/virtio" \
-type f | cpio -pd "$tmpdir" >/dev/null 2>&1
}
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# generate "modules" files
generate_depmod() {
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# install list of drivers
cp "${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() {
for b in $(printf "%s\n" "$@" | tr " " "\n"); do
# check binary existence
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command -v "$b" >/dev/null 2>&1 || msg panic "$b doesn't exists"
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# install and strip binary
install -s -m755 "$(command -v $b)" -t "${tmpdir}/usr/bin"
# check statically linking
ldd "$(command -v $b)" >/dev/null 2>&1 || continue
# install libraries
install_libraries $b
done
}
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# TODO make strip optional
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# handle libraries
install_libraries() {
for l in $(ldd "$(command -v $1)" | sed -nre 's,.* (/.*lib.*/.*.so.*) .*,\1,p' -e 's,.*(/lib.*/ld.*.so.*) .*,\1,p'); do
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# check symlink
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if [ -h "$l" ]; then
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# check lib already existence
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if [ ! -e "${tmpdir}/usr/lib/${l##*/}" ] && [ ! -e "${tmpdir}/$(readlink -f $l)" ]; then
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# regular
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install -s -m755 "$(readlink -f $l)" -t "${tmpdir}/usr/lib"
# FIXME handle all symlinks
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# symlink may link to symlink
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[ -h "/usr/lib/$(readlink $l)" ] && cp -a "/usr/lib/$(readlink $l)" "${tmpdir}/usr/lib"
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# symlink
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cp -a "$l" "${tmpdir}/usr/lib"
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fi
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else
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if [ ! -e "${tmpdir}/usr/lib/${l##*/}" ]; then
install -s -m755 "$l" -t "${tmpdir}/usr/lib"
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fi
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fi
done
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}
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# install important files
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install_files() {
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# FIXME eof broken
# initialize config
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="$luks_args"
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EOF
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# needed for devmgr
cat <<EOF > "${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
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() {
{
( cd "$tmpdir" && {
find . | cpio -oH newc | gzip -9
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} ) > "${script_dir}/initramfs-${kernel}.img.gz"
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} >/dev/null 2>&1
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[ "$?" = 0 ] || 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="$(mktemp -d /tmp/initramfs.XXXXXXXX)" || msg panic "failed to create working directory"
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kernel="$(uname -r)"
moddir="/lib/modules/"
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modker="${moddir}${kernel}"
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check_requirements
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create_structure
create_symlinks
#parse_fstab
#parse_crypttab
install_binaries $binaries
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if [ "$hostonly" = 1 ]; then
install_drivers
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"