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|
#!/bin/sh
set -e
compressor="lz4 --best --favor-decSpeed -l"
# generate a cpio entry for a command
gen_cmd() {
cmd=$1
cmdp="$(command -v "$cmd")"
# builtin
if [ "$cmd" = "$cmdp" ]; then
return
fi
printf 'file %s %s 0755 0 0\n' "$cmdp" "$cmdp"
ldd "$cmdp" | grep / | while read line; do
tmp=${line% *}
lib=/${tmp#*/}
# don't bother with ld.so.conf
printf 'file /lib64/%s %s 0755 0 0\n' "${lib##*/}" "$lib"
done
}
# generate the main file list
gen_cpio_list() {
sed -e '/^#/d' cpio_list.txt
gen_cmd e2fsck
gen_cmd dropbear
export LD_PRELOAD=libgcc_s.so.1
gen_cmd cryptsetup
}
# filter the list and insert parent directory entries
gen_dir_ents() {
while read type target args; do
# re-print the original entry
printf '%s %s %s\n' "$type" "$target" "$args"
# print the necessary directory entries. duplicates will be
# filtered by sort -u later
while [ "${target%/*}" != '' ]; do
target=${target%/*}
printf 'dir %s 0755 0 0\n' "$target"
done
done
}
# filter the list and generate the make dependency file
gen_depfile() {
deps='cpio_list.txt make'
while read type target source args; do
# re-print the original entry
printf '%s %s %s %s\n' "$type" "$target" "$source" "$args"
# accumulate the dependencies in a list to avoid make bugs.
# there will be no duplicates since the list was previously sorted
if [ "$type" = file ]; then
deps="$deps $source"
# avoid "No rule to make target" when deps disappear
echo "$source:" >&3
fi
done
echo "initramfs.img: $deps" >&3
}
if ! [ -e cpio_list.txt ] || ! [ -e gen_init_cpio ]; then
cd "${0%/*}"
fi
gen_cpio_list | \
gen_dir_ents | \
sort -u | \
gen_depfile 3>initramfs.d | \
./gen_init_cpio -t 0 - | \
$compressor > initramfs.img
|
