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