285 lines
6.2 KiB
Bash
Executable File
285 lines
6.2 KiB
Bash
Executable File
#!/bin/sh
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#
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# tiny initramfs generation tool
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panic() {
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printf "panic >> %s\n" "$@"
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exit 1
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}
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info() {
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printf "info >> %s\n" "$@"
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}
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remove_tmpdir() {
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# remove tmpdir
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rm -rf "$tmpdir"
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}
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check_requirements() {
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# check needed files
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for f in ./config ./init ./busybox; do
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[ -e "$f" ] || panic "$f doesn't exists"
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done
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# TODO handle busybox requirements ( busybox --list | grep ash )
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# source config
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. ./config
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}
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create_structure() {
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# create FHS directory structure
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for d in dev tmp var run etc usr/lib usr/bin mnt/root proc root sys; do
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mkdir -p "${tmpdir}/${d}"
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done
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}
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create_symlinks() {
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# some dynamically linked libraries and binaries compiled with hardcoded
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# dependencies path. to make it worked we need create symlinks for them.
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# also POSIX ln doesn't have --relative flag like in GNU ln. as workaround
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# we change directory to tmpdir and make needed symlinks.
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( cd "$tmpdir" && {
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ln -s usr/lib lib
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ln -s usr/lib lib64
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ln -s usr/bin bin
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ln -s usr/bin sbin
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ln -s ../run var/run
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cd "$tmpdir/usr"
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ln -s bin sbin
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ln -s lib lib64
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} )
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}
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#parse_fstab() {
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# TODO parse fstab
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#while [ "$use_fstab" -eq 1 ] && read fs dir type opts; do thing; done < /etc/fstab
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#}
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#parse_crypttab() {
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# TODO parse crypttab
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#}
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# handle device managers
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use_mdev() {
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# install mdev
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install -m644 mdev.conf -t "$tmpdir/etc"
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install -Dm755 storage-device -t "$tmpdir/lib/mdev"
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}
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use_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 "$tmpdir/etc"
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install -Dm755 storage-device -t "$tmpdir/lib/mdev"
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}
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use_udev() {
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# install udev
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install_binaries 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 "$tmpdir" >/dev/null 2>&1
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}
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# handle lvm
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use_lvm() {
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install_binaries lvm
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# FIXME this code doesn't working with udev
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#mkdir "$tmpdir/etc/lvm"
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# use_lvmetad = 0 - avoid lvmetad missing warning message
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#cat <<EOF > "$tmpdir/etc/lvm/lvmlocal.conf"
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#local {
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# issue_discards = ${lvm_discard:-0}
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# use_lvmetad = 0
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#}
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#EOF
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# TODO implement use_lvmconf
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}
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# handle luks
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use_luks() {
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install_binaries cryptsetup
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# avoid locking directory missing warning message
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mkdir "${tmpdir}/run/cryptsetup"
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# TODO get rid of this workaround
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# workaround for luks2
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install -s -m755 /usr/lib/libgcc_s.so.1 -t "${tmpdir}/usr/lib"
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[ "$luks_discard" = 1 ] && luks_args="--allow-discards $luks_args"
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# TODO detached header
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# TODO keyfile
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}
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# TODO implement hostonly mode
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# install drivers
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install_drivers() {
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modker="${moddir}${kernel}"
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find \
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"${modker}/kernel/drivers/virtio" \
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"${modker}/kernel/arch" \
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"${modker}/kernel/crypto" \
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"${modker}/kernel/fs" \
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"${modker}/kernel/lib" \
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"${modker}/kernel/drivers/block" \
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"${modker}/kernel/drivers/ata" \
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"${modker}/kernel/drivers/md" \
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"${modker}/kernel/drivers/scsi" \
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"${modker}/kernel/drivers/usb/storage" \
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"${modker}/kernel/drivers/usb/host" \
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-type f | cpio -pd "$tmpdir" >/dev/null 2>&1
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# install list of drivers
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cp "${modker}/modules.softdep" "${modker}/modules.builtin" "${modker}/modules.order" "${tmpdir}/${modker}"
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# generate dependencies list of drivers
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depmod -b "$tmpdir" "$kernel"
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}
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# TODO make strip optional
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# handle binaries
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install_binaries() {
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for b in $(printf "%s\n" "$@" | tr " " "\n"); do
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# check binary existence
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command -v "$b" >/dev/null 2>&1 || panic "$b doesn't exists"
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# install and strip binary
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install -s -m755 "$(command -v $b)" -t "${tmpdir}/usr/bin"
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# check statically linking
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ldd "$(command -v $b)" >/dev/null 2>&1 || continue
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# install libraries
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install_libraries $b
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done
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}
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# TODO make strip optional
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# handle libraries
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install_libraries() {
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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"
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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 $l)" ] && cp -a "/usr/lib/$(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
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install -s -m755 "$l" -t "${tmpdir}/usr/lib"
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fi
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fi
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done
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}
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install_files() {
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# FIXME eof broken
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# 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"
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root_args="$root_args"
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devmgr="$devmgr"
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#drivers="$drivers"
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use_lvm="$use_lvm"
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use_luks="$use_luks"
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luks_root="$luks_root"
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luks_header="$luks_header"
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luks_keyfile="$luks_keyfile"
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luks_args="$luks_args"
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EOF
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# needed for devmgr
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cat <<EOF > "${tmpdir}/etc/group"
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root:x:0:
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tty:x:5:
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dialout:x:11:
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uucp:x:14:
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kmem:x:3:
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input:x:25:
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video:x:13:
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audio:x:12:
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lp:x:10:
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disk:x:9:
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cdrom:x:16:
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tape:x:6:
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kvm:x:24:
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floppy:x:8:
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EOF
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# needed for devmgr
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cat <<EOF > "${tmpdir}/etc/passwd"
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root:x:0:0::/root:/bin/sh
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nobody:x:99:99::/:/bin/false
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EOF
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# install init script
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install -m755 ./init -t "$tmpdir"
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}
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# TODO add more compession tools
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# create cpio archive and compress
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create_initramfs() {
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{
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( cd "$tmpdir" && {
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find . | cpio -oH newc | gzip -9
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} ) > "./initramfs-${kernel}.img.gz"
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} >/dev/null 2>&1
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[ "$?" = 0 ] || panic "failed to generate initramfs image"
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}
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# TODO cd to script directory
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[ "$(id -u)" = 0 ] || panic "must be run as root"
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# remove tmpdir on exit or unexpected error
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trap remove_tmpdir EXIT INT
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# variables
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tmpdir="$(mktemp -d /tmp/initramfs.XXXXXXXX)" || panic "failed to create working directory"
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kernel="$(uname -r)"
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moddir="/lib/modules/"
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check_requirements
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# handle debug mode
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[ "$debug" = 1 ] && {
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set -x
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trap : EXIT INT
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}
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create_structure
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create_symlinks
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#parse_fstab
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#parse_crypttab
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install_binaries $binaries
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install_drivers
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install_files
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case "$devmgr" in
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mdev) use_mdev ;;
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mdevd) use_mdevd ;;
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udev) use_udev ;;
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*) panic "devmgr option broken" ;;
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esac
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[ "$use_luks" = 1 ] && use_luks
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[ "$use_lvm" = 1 ] && use_lvm
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create_initramfs
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info "done! check out initramfs-${kernel}.img.gz"
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