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+#!/bin/sh
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+# Copyright (C) Martin Schlemmer <azarah@nosferatu.za.org>
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+# Released under the terms of the GNU GPL
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+#
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+# Generate a newline separated list of entries from the file/directory
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+# supplied as an argument.
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+#
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+# If a file/directory is not supplied then generate a small dummy file.
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+#
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+# The output is suitable for gen_init_cpio built from usr/gen_init_cpio.c.
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+#
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+
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+default_initramfs() {
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+ cat <<-EOF
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+ # This is a very simple, default initramfs
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+
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+ dir /dev 0755 0 0
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+ nod /dev/console 0600 0 0 c 5 1
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+ dir /root 0700 0 0
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+ EOF
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+}
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+
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+filetype() {
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+ local argv1="$1"
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+
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+ # symlink test must come before file test
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+ if [ -L "$argv1" ]; then
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+ echo "slink"
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+ elif [ -f "$argv1" ]; then
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+ echo "file"
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+ elif [ -d "$argv1" ]; then
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+ echo "dir"
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+ elif [ -b "$argv1" -o -c "$argv1" ]; then
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+ echo "nod"
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+ elif [ -p "$argv1" ]; then
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+ echo "pipe"
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+ elif [ -S "$argv1" ]; then
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+ echo "sock"
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+ else
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+ echo "invalid"
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+ fi
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+ return 0
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+}
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+
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+print_mtime() {
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+ local argv1="$1"
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+ local mymtime="0"
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+
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+ if [ -e "$argv1" ]; then
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+ mymtime=$(find "$argv1" -printf "%T@\n" | sort -r | head -n 1)
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+ fi
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+
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+ echo "# Last modified: $mymtime"
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+ echo
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+}
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+
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+parse() {
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+ local location="$1"
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+ local name=$(echo "$location" | sed -e "s,$srcdir,,")
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+ # change '//' into '/'
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+ name=$(echo $name | sed -e 's,/[/]*,/,g')
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+ local mode="$2"
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+ local uid="$3"
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+ local gid="$4"
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+ local ftype=$(filetype "$location")
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+ # remap uid/gid to 0 if necessary
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+ [ "x$uid" != "x" ] && [ $uid -eq $root_uid ] && uid=0
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+ [ "x$gid" != "x" ] && [ $gid -eq $root_gid ] && gid=0
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+ local str="$mode $uid $gid"
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+
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+ [ "$ftype" = "invalid" ] && return 0
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+ [ "$location" = "$srcdir" ] && return 0
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+
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+ case "$ftype" in
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+ "file")
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+ str="$ftype $name $location $str"
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+ ;;
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+ "nod")
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+ local devtype=
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+ local maj=$(LC_ALL=C ls -l "$location" | \
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+ awk '{sub(/,/, "", $5); print $5}')
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+ local min=$(LC_ALL=C ls -l "$location" | \
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+ awk '{print $6}')
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+
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+ if [ -b "$location" ]; then
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+ devtype="b"
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+ else
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+ devtype="c"
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+ fi
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+ str="$ftype $name $str $devtype $maj $min"
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+ ;;
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+ "slink")
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+ local target=$(LC_ALL=C ls -l "$location" | \
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+ awk '{print $11}')
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+ str="$ftype $name $target $str"
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+ ;;
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+ *)
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+ str="$ftype $name $str"
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+ ;;
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+ esac
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+
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+ echo "$str"
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+
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+ return 0
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+}
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+
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+usage() {
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+ printf "Usage:\n"
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+ printf "$0 [ [-u <root_uid>] [-g <root_gid>] [-d | <cpio_source>] ] . . .\n"
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+ printf "\n"
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+ printf -- "-u <root_uid> User ID to map to user ID 0 (root).\n"
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+ printf " <root_uid> is only meaningful if <cpio_source>\n"
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+ printf " is a directory.\n"
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+ printf -- "-g <root_gid> Group ID to map to group ID 0 (root).\n"
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+ printf " <root_gid> is only meaningful if <cpio_source>\n"
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+ printf " is a directory.\n"
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+ printf "<cpio_source> File list or directory for cpio archive.\n"
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+ printf " If <cpio_source> is not provided then a\n"
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+ printf " a default list will be output.\n"
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+ printf -- "-d Output the default cpio list. If no <cpio_source>\n"
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+ printf " is given then the default cpio list will be output.\n"
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+ printf "\n"
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+ printf "All options may be repeated and are interpreted sequentially\n"
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+ printf "and immediately. -u and -g states are preserved across\n"
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+ printf "<cpio_source> options so an explicit \"-u 0 -g 0\" is required\n"
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+ printf "to reset the root/group mapping.\n"
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+}
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+
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+build_list() {
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+ printf "\n#####################\n# $cpio_source\n"
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+
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+ if [ -f "$cpio_source" ]; then
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+ print_mtime "$cpio_source"
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+ cat "$cpio_source"
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+ elif [ -d "$cpio_source" ]; then
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+ srcdir=$(echo "$cpio_source" | sed -e 's://*:/:g;s:/$::')
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+ dirlist=$(find "$srcdir" -printf "%p %m %U %G\n" 2>/dev/null)
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+
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+ # If $dirlist is only one line, then the directory is empty
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+ if [ "$(echo "$dirlist" | wc -l)" -gt 1 ]; then
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+ print_mtime "$cpio_source"
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+
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+ echo "$dirlist" | \
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+ while read x; do
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+ parse $x
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+ done
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+ else
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+ # Failsafe in case directory is empty
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+ default_initramfs
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+ fi
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+ else
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+ echo " $0: Cannot open '$cpio_source'" >&2
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+ exit 1
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+ fi
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+}
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+
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+
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+root_uid=0
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+root_gid=0
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+
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+while [ $# -gt 0 ]; do
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+ arg="$1"
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+ shift
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+ case "$arg" in
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+ "-u")
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+ root_uid="$1"
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+ shift
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+ ;;
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+ "-g")
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+ root_gid="$1"
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+ shift
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+ ;;
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+ "-d")
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+ default_list="$arg"
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+ default_initramfs
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+ ;;
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+ "-h")
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+ usage
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+ exit 0
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+ ;;
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+ *)
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+ case "$arg" in
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+ "-"*)
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+ printf "ERROR: unknown option \"$arg\"\n" >&2
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+ printf "If the filename validly begins with '-', then it must be prefixed\n" >&2
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+ printf "by './' so that it won't be interpreted as an option." >&2
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+ printf "\n" >&2
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+ usage >&2
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+ exit 1
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+ ;;
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+ *)
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+ cpio_source="$arg"
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+ build_list
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+ ;;
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+ esac
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+ ;;
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+ esac
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+done
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+
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+# spit out the default cpio list if a source hasn't been specified
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+[ -z "$cpio_source" -a -z "$default_list" ] && default_initramfs
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+
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+exit 0
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Bernhard Reutner-Fischer