[PATCH] Select cpio_list or source directory for initramfs image

Attached is a patch that adds CONFIG_INITRAMFS_SOURCE, enabling you to
either specify a file as cpio_list, or a directory to generate a list from.

It depreciate the INITRAMFS_LIST environment variable introduced not long
ago.

There are some issues (suggestions/patches welcome) that I am not
sure about:
1) I put the menu entry under block devices, but I am not sure if
   this is the correct location?
2) There might be a better (or more correct) way to do this with
   kbuild?
3) Variable names and especially help text needs some love.
4) I am not sure if I am duplicating work in progress?
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/block/Kconfig

@@ -348,6 +348,32 @@ config BLK_DEV_INITRD
 	  "real" root file system, etc. See <file:Documentation/initrd.txt>
 	  for details.
 
+config INITRAMFS_SOURCE
+	string "Source directory of cpio_list"
+	default ""
+	help
+	  This can be set to either a directory containing files, etc to be
+	  included in the initramfs archive, or a file containing newline
+	  separated entries.
+
+	  If it is a file, it should be in the following format:
+	    # a comment
+	    file <name> <location> <mode> <uid> <gid>
+	    dir <name> <mode> <uid> <gid>
+	    nod <name> <mode> <uid> <gid> <dev_type> <maj> <min>
+
+	  Where:
+	    <name>      name of the file/dir/nod in the archive
+	    <location>  location of the file in the current filesystem
+	    <mode>      mode/permissions of the file
+	    <uid>       user id (0=root)
+	    <gid>       group id (0=root)
+	    <dev_type>  device type (b=block, c=character)
+	    <maj>       major number of nod
+	    <min>       minor number of nod
+
+	If you are not sure, leave it blank.
+
 config LBD
 	bool "Support for Large Block Devices"
 	depends on X86 || MIPS32 || PPC32 || ARCH_S390_31 || SUPERH

scripts/gen_initramfs_list.sh

+#!/bin/bash
+# Copyright (C) Martin Schlemmer <azarah@nosferatu.za.org>
+# Released under the terms of the GNU GPL
+#
+# A script to generate newline separated entries (to stdout) from a directory's
+# contents suitable for use as a cpio_list for gen_init_cpio.
+#
+# Arguements: $1 -- the source directory
+#
+# TODO:  Add support for symlinks, sockets and pipes when gen_init_cpio
+#        supports them.
+
+usage() {
+	echo "Usage: $0 initramfs-source-dir"
+	exit 1
+}
+
+srcdir=$(echo "$1" | sed -e 's://*:/:g')
+
+if [ "$#" -gt 1 -o ! -d "${srcdir}" ]; then
+	usage
+fi
+
+filetype() {
+	local argv1="$1"
+
+	if [ -f "${argv1}" ]; then
+		echo "file"
+	elif [ -d "${argv1}" ]; then
+		echo "dir"
+	elif [ -b "${argv1}" -o -c "${argv1}" ]; then
+		echo "nod"
+	else
+		echo "invalid"
+	fi
+	return 0
+}
+
+parse() {
+	local location="$1"
+	local name="${location/${srcdir}//}"
+	local mode="$2"
+	local uid="$3"
+	local gid="$4"
+	local ftype=$(filetype "${location}")
+	local str="${mode} ${uid} ${gid}"
+
+	[ "${ftype}" == "invalid" ] && return 0
+	[ "${location}" == "${srcdir}" ] && return 0
+
+	case "${ftype}" in
+		"file")
+			str="${ftype} ${name} ${location} ${str}"
+			;;
+		"nod")
+			local dev_type=
+			local maj=$(LC_ALL=C ls -l "${location}" | \
+					gawk '{sub(/,/, "", $5); print $5}')
+			local min=$(LC_ALL=C ls -l "${location}" | \
+					gawk '{print $6}')
+
+			if [ -b "${location}" ]; then
+				dev_type="b"
+			else
+				dev_type="c"
+			fi
+			str="${ftype} ${name} ${str} ${dev_type} ${maj} ${min}"
+			;;
+		*)
+			str="${ftype} ${name} ${str}"
+			;;
+	esac
+
+	echo "${str}"
+
+	return 0
+}
+
+find "${srcdir}" -printf "%p %m %U %G\n" | \
+while read x; do
+	parse ${x}
+done
+
+exit 0

usr/Makefile

@@ -8,7 +8,7 @@ clean-files := initramfs_data.cpio.gz
 # If you want a different list of files in the initramfs_data.cpio
 # then you can either overwrite the cpio_list in this directory
 # or set INITRAMFS_LIST to another filename.
-INITRAMFS_LIST ?= $(obj)/initramfs_list
+INITRAMFS_LIST := $(obj)/initramfs_list
 
 # initramfs_data.o contains the initramfs_data.cpio.gz image.
 # The image is included using .incbin, a dependency which is not
@@ -23,6 +23,24 @@ $(obj)/initramfs_data.o: $(obj)/initramfs_data.cpio.gz FORCE
 # Commented out for now
 # initramfs-y := $(obj)/root/hello
 
+quiet_cmd_gen_list = GEN_INITRAMFS_LIST $@
+      cmd_gen_list = $(shell \
+        if test -f $(CONFIG_INITRAMFS_SOURCE); then \
+	  if [ $(CONFIG_INITRAMFS_SOURCE) != $@ ]; then \
+	    echo 'cp -f $(CONFIG_INITRAMFS_SOURCE) $@'; \
+	  else \
+	    echo 'echo Using shipped $@'; \
+	  fi; \
+	elif test -d $(CONFIG_INITRAMFS_SOURCE); then \
+	  echo 'scripts/gen_initramfs_list.sh $(CONFIG_INITRAMFS_SOURCE) > $@'; \
+	else \
+	  echo 'echo Using shipped $@'; \
+	fi)
+
+
+$(INITRAMFS_LIST): FORCE
+	$(call cmd,gen_list)
+
 quiet_cmd_cpio = CPIO    $@
       cmd_cpio = ./$< $(INITRAMFS_LIST) > $@