tinyramfs/generate

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#!/bin/sh
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#
# tiny initramfs generation tool
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# debugging
set -x
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# check root and files
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if [ "$(id -u)" != 0 ]; then
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echo "must be run as root"
exit 1
elif [ ! -e ./config ]; then
echo "config doesn't exists"
exit 1
elif [ ! -e ./init ]; then
echo "init doesn't exists"
exit 1
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# TODO remove static busybox dependency | handle busybox requirements ( busybox --list | grep ash )
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elif [ ! -n "$(ldd ./busybox | grep "not a dynamic executable")" ]; then
echo "busybox doesn't exists or dynamically linked. please download or/and build static busybox"
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exit 1
fi
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# source config
. ./config
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# variables
tmpdir="$(mktemp -d /tmp/initramfs.XXXXXXXX)"
kernel="$(uname -r)"
moddir="/lib/modules"
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binaries="./busybox findfs blkid mount modprobe umount $binaries"
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# structure
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for d in dev tmp var run etc usr/lib usr/bin mnt/root proc root sys; do
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mkdir -p "$tmpdir/$d"
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done
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# symlinks
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( cd "$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
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cd "$tmpdir/usr"
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ln -s bin sbin
ln -s lib lib64
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} )
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# TODO parse fstab | crypttab
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#while [ "$use_fstab" -eq 1 ] && read fs dir type opts; do thing; done < /etc/fstab
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# handle device managers
if [ "$use_mdevd" = 1 ]; then
# install mdevd
binaries="mdevd mdevd-coldplug $binaries"
mkdir "$tmpdir/lib/mdev"
cp mdev.conf "$tmpdir/etc"
cp storage-device "$tmpdir/lib/mdev"
chmod +x "$tmpdir/lib/mdev/storage-device"
elif [ "$use_mdev" = 1 ]; then
# install mdev
mkdir "$tmpdir/lib/mdev"
cp mdev.conf "$tmpdir/etc"
cp storage-device "$tmpdir/lib/mdev"
chmod +x "$tmpdir/lib/mdev/storage-device"
elif [ "$use_udev" = 1 ]; then
# install udev
binaries="udevd udevadm dmsetup $binaries"
find /usr/lib/udev -type f | grep -v "rc_keymaps\|hwdb.d" | cpio -pd "$tmpdir"
fi
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cat <<EOF > "$tmpdir/etc/group"
root:x:0:
tty:x:5:
dialout:x:11:
uucp:x:14:
kmem:x:3:
input:x:25:
video:x:13:
audio:x:12:
lp:x:10:
disk:x:9:
cdrom:x:16:
tape:x:6:
kvm:x:24:
floppy:x:8:
EOF
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cat <<EOF > "$tmpdir/etc/passwd"
root:x:0:0::/root:/bin/sh
nobody:x:99:99::/:/bin/false
EOF
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# handle lvm
if [ "$use_lvm" = 1 ] && [ -x "$(command -v lvm)" ]; then
binaries="lvm $binaries"
#mkdir "$tmpdir/etc/lvm"
# use_lvmetad = 0 - avoid lvmetad missing warning message
#cat <<EOF > "$tmpdir/etc/lvm/lvmlocal.conf"
#local {
# issue_discards = ${lvm_discard:-0}
# use_lvmetad = 0
#}
#EOF
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# TODO implement use_lvmconf
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fi
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# handle luks
if [ "$use_luks" = 1 ] && [ -x "$(command -v cryptsetup)" ]; then
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binaries="cryptsetup $binaries"
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# avoid locking directory missing warning message
mkdir "$tmpdir/run/cryptsetup"
# TODO get rid of this workaround
# workaround for luks2
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cp /usr/lib/libgcc_s.so.1 "$tmpdir/usr/lib"
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[ "$luks_discard" = 1 ] && luks_args="--allow-discards $luks_args"
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# TODO detached header
# TODO keyfile
fi
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# TODO rewrite drivers installing | handle $drivers config var
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# install drivers
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find \
"$moddir/$kernel/kernel/drivers/virtio" \
"$moddir/$kernel/kernel/arch" \
"$moddir/$kernel/kernel/crypto" \
"$moddir/$kernel/kernel/fs" \
"$moddir/$kernel/kernel/lib" \
"$moddir/$kernel/kernel/drivers/block" \
"$moddir/$kernel/kernel/drivers/ata" \
"$moddir/$kernel/kernel/drivers/md" \
"$moddir/$kernel/kernel/drivers/scsi" \
"$moddir/$kernel/kernel/drivers/usb/storage" \
"$moddir/$kernel/kernel/drivers/usb/host" \
-type f | cpio -pd "$tmpdir" 2>/dev/null
# install list of drivers
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cp "$moddir/$kernel/modules.softdep" "$moddir/$kernel/modules.builtin" "$moddir/$kernel/modules.order" "$tmpdir/$moddir/$kernel"
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# generate dependencies list of drivers
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depmod -b "$tmpdir" "$kernel"
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# TODO make strip optional
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# install and strip binaries and libraries
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for b in $(echo $binaries); do
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# check binary existence
if [ ! "$(command -v $b)" ]; then
echo "$b doesn't exists or permission denied"
exit 1
fi
# copy and strip binary
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cp "$(command -v $b)" "$tmpdir/usr/bin"
chmod +x "$tmpdir/usr/bin/$b"
strip -s "$tmpdir/usr/bin/$b"
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# check statically linking
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ldd "$(command -v $b)" >/dev/null || continue
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# handle libraries symlinks for dymanically linked binaries
for l in $(ldd "$(command -v $b)" | sed -nre 's,.* (/.*lib.*/.*.so.*) .*,\1,p' -e 's,.*(/lib.*/ld.*.so.*) .*,\1,p'); do
# check symlink
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if [ -h "$l" ]; then
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# check lib already existence
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if [ ! -e "$tmpdir/usr/lib/${l##*/}" ] && [ ! -e "$tmpdir$(readlink -f $l)" ]; then
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# regular
cp "$(readlink -f $l)" "$tmpdir/usr/lib"
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strip -s "$tmpdir$(readlink -f $l)"
# TODO handle all symlinks
# symlink may link to symlink
[ -h "/usr/lib/$(readlink $l)" ] && cp -a "/usr/lib/$(readlink $l)" "$tmpdir/usr/lib"
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# symlink
cp -a "$l" "$tmpdir/usr/lib"
fi
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else
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if [ ! -e "$tmpdir/usr/lib/${l##*/}" ]; then
cp "$l" "$tmpdir/usr/lib"
strip -s "$tmpdir/usr/lib/${l##*/}"
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fi
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fi
done
done
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# install init
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cp ./init "$tmpdir/init"
chmod +x "$tmpdir/init"
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# initialize config
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cat <<EOF > "$tmpdir/config"
root="$root"
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root_type="$root_type"
root_args="$root_args"
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use_mdevd="$use_mdevd"
use_mdev="$use_mdev"
use_udev="$use_udev"
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#drivers="$drivers"
use_lvm="$use_lvm"
use_luks="$use_luks"
luks_root="$luks_root"
luks_header="$luks_header"
luks_keyfile="$luks_keyfile"
luks_args="$luks_args"
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EOF
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# TODO add another compession tools
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# packing
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if ! ( cd "$tmpdir" && find . | cpio --create --verbose --format=newc | gzip --best ) > "./initramfs-$kernel.img.gz" 2>/dev/null; then
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echo "failed"
exit 1
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fi
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# remove tmpdir
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rm -rf "$tmpdir"
echo "done! check out initramfs-$kernel.img.gz"