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#!/bin/sh
# generate a cpio entry for a command
gen_cmd() {
cmd=$1
cmdp="$(command -v "$cmd")" || exit 1
# ignore builtins
[ "$cmd" != "$cmdp" ] || return
printf 'file %s %s 0755 0 0\n' "$cmdp" "$cmdp"
ldd "$cmdp" | awk '/=>/ { print "file /lib64/" $1 " " $3 " 0755 0 0" }'
}
# generate the main file list
gen_cpio_list() {
sed -e '/^#/d' cpio_list.txt
tr ' ' '\n' < modules.dep | sed -e "s/://;s:.*:file /lib/modules/$KERNVER/& /lib/modules/$KERNVER/& 0644 0 0:"
gen_cmd e2fsck
gen_cmd dropbear
gen_cmd cryptsetup
ldconfig -p | awk '$1 == "libgcc_s.so.1" && $2 ~ /x86-64/ { print "file /lib64/" $1 " " $4 " 0755 0 0" }'
}
# filter the list and insert parent directory entries
gen_dir_ents() {
awk '{print; while (sub("/[^/]*$", "", $2) && $2) print "dir " $2 " 0755 0 0"; }'
}
# filter the list and generate the make dependency file
gen_depfile() {
awk -v f=/dev/fd/3 -v deps="cpio_list.txt make" '
{ print }
$1 == "file" { deps=deps " " $3; print $3 ":" > f }
END { print "initramfs.img: " deps > f }
'
}
if ! [ -e cpio_list.txt ] || ! [ -e gen_init_cpio ]; then
cd "${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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