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#!/bin/sh
toppid=$$
die() {
fmt=$1
shift
printf "error building initramfs: $fmt\n" "$@" >&2
kill "$toppid"
trap '' EXIT
exit 1
}
# generate a cpio entry for a command
gen_cmd() {
cmd=$1
cmdp="$(command -v "$cmd")" || die 'command not found: %s' "$cmd"
# ignore builtins
[ "$cmd" != "$cmdp" ] || return
printf 'file %s %s 0755 0 0\n' "$cmdp" "$cmdp"
ldd "$cmdp" | awk '/\// { if ($1~/^\//) file=$1; else file=$3; print "file " file " " file " 0755 0 0" }'
}
# generate the main file list
gen_cpio_list() {
sed -e '/^#/d' cpio_list.txt
tr ' ' '\n' < modules.dep | sed -e "s/://;s:.*:file /lib/modules/$KERNVER/& /lib/modules/$KERNVER/& 0644 0 0:"
gen_cmd e2fsck
gen_cmd dropbear
gen_cmd cryptsetup
ldconfig -p | awk '$1 == "libgcc_s.so.1" { print "file " $4 " " $4 " 0755 0 0" }'
}
# filter the list and insert parent directory entries
gen_dir_ents() {
awk '{print; while (sub("/[^/]*$", "", $2) && $2) print "dir " $2 " 0755 0 0"; }'
}
# filter the list and generate the make dependency file
gen_depfile() {
deps='cpio_list.txt make'
awk -v d=/dev/fd/3 '$1 == "file" {print; deps=deps " " $3; print $3 ":" > d; } END { print "initramfs.img:" deps > d }'
}
if ! [ -e cpio_list.txt ] || ! [ -e gen_init_cpio ]; then
cd "${0%/*}"
fi
gen_cpio_list | gen_dir_ents | sort -u | gen_depfile 3>initramfs.d | ./gen_init_cpio -t 0 - | $COMPRESSOR > initramfs.img
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