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mkinitfs-rundep: new tool for tracing runtime deps

--- a/Makefile

+++ b/Makefile

@@ -5,7 +5,7 @@

 datarootdir	?= /usr/share

 datadir		?= $(datarootdir)/mkinitfs

-SBIN_FILES	:= mkinitfs bootchartd

+SBIN_FILES	:= mkinitfs bootchartd mkinitfs-rundep

 SHARE_FILES	:= initramfs-init fstab passwd group

 CONF_FILES	:= mkinitfs.conf \

 		modules.d/ata \

--- /dev/null

+++ b/mkinitfs-rundep.in

@@ -1,0 +1,36 @@

+#!/bin/sh

+

+# resolve .so dependencies using ldd

+

+find_path() {

+	for i in /lib /usr/lib; do

+		[ -e "$i/$1" ] && echo "$i/$1" && return 0

+	done

+	return 1

+}

+

+resolve_links() {

+	local f

+	while [ $# -gt 0 ]; do

+		if [ -L "$1" ]; then

+			local f=$(readlink $1)

+			local p="$(find_path $f)"

+#			echo "following $p"

+			resolve_links $p

+		fi

+		echo "$1"

+		shift

+	done

+}

+

+find_deps() {

+	bin=$1

+	resolve_links $(ldd $bin 2>/dev/null | awk -F'=>' '{print $2}' | sed 's/(.*//')

+}

+

+while [ $# -gt 0 ]; do

+	find_deps $1 || exit 1

+	shift

+done

+

+