scripts/gen_initramfs_list.sh

   1 #!/bin/bash
   2 # Copyright (C) Martin Schlemmer <azarah@nosferatu.za.org>
   3 # Released under the terms of the GNU GPL
   4 #
   5 # Generate a newline separated list of entries from the file/directory pointed
   6 # out by the environment variable: CONFIG_INITRAMFS_SOURCE
   7 #
   8 # If CONFIG_INITRAMFS_SOURCE is non-existing then generate a small dummy file.
   9 #
  10 # The output is suitable for gen_init_cpio as found in usr/Makefile.
  11 #
  12 # TODO:  Add support for symlinks, sockets and pipes when gen_init_cpio
  13 #        supports them.
  14
  15 simple_initramfs() {
  16         cat <<-EOF
  17                 # This is a very simple initramfs
  18
  19                 dir /dev 0755 0 0
  20                 nod /dev/console 0600 0 0 c 5 1
  21                 dir /root 0700 0 0
  22         EOF
  23 }
  24
  25 filetype() {
  26         local argv1="$1"
  27
  28         if [ -f "${argv1}" ]; then
  29                 echo "file"
  30         elif [ -d "${argv1}" ]; then
  31                 echo "dir"
  32         elif [ -b "${argv1}" -o -c "${argv1}" ]; then
  33                 echo "nod"
  34         else
  35                 echo "invalid"
  36         fi
  37         return 0
  38 }
  39
  40 print_mtime() {
  41         local argv1="$1"
  42         local my_mtime="0"
  43
  44         if [ -e "${argv1}" ]; then
  45                 my_mtime=$(find "${argv1}" -printf "%T@\n" | sort -r | head -n 1)
  46         fi
  47
  48         echo "# Last modified: ${my_mtime}"
  49         echo
  50 }
  51
  52 parse() {
  53         local location="$1"
  54         local name="${location/${srcdir}//}"
  55         local mode="$2"
  56         local uid="$3"
  57         local gid="$4"
  58         local ftype=$(filetype "${location}")
  59         local str="${mode} ${uid} ${gid}"
  60
  61         [ "${ftype}" == "invalid" ] && return 0
  62         [ "${location}" == "${srcdir}" ] && return 0
  63
  64         case "${ftype}" in
  65                 "file")
  66                         str="${ftype} ${name} ${location} ${str}"
  67                         ;;
  68                 "nod")
  69                         local dev_type=
  70                         local maj=$(LC_ALL=C ls -l "${location}" | \
  71                                         gawk '{sub(/,/, "", $5); print $5}')
  72                         local min=$(LC_ALL=C ls -l "${location}" | \
  73                                         gawk '{print $6}')
  74
  75                         if [ -b "${location}" ]; then
  76                                 dev_type="b"
  77                         else
  78                                 dev_type="c"
  79                         fi
  80                         str="${ftype} ${name} ${str} ${dev_type} ${maj} ${min}"
  81                         ;;
  82                 *)
  83                         str="${ftype} ${name} ${str}"
  84                         ;;
  85         esac
  86
  87         echo "${str}"
  88
  89         return 0
  90 }
  91
  92 if [ -z "$1" ]; then
  93         simple_initramfs
  94 elif [ -f "$1" ]; then
  95         print_mtime "$1"
  96         cat "$1"
  97 elif [ -d "$1" ]; then
  98         srcdir=$(echo "$1" | sed -e 's://*:/:g')
  99         dirlist=$(find "${srcdir}" -printf "%p %m %U %G\n" 2>/dev/null)
 100
 101         # If $dirlist is only one line, then the directory is empty
 102         if [  "$(echo "${dirlist}" | wc -l)" -gt 1 ]; then
 103                 print_mtime "$1"
 104
 105                 echo "${dirlist}" | \
 106                 while read x; do
 107                         parse ${x}
 108                 done
 109         else
 110                 # Failsafe in case directory is empty
 111                 simple_initramfs
 112         fi
 113 else
 114         echo "  $0: Cannot open '$1' (CONFIG_INITRAMFS_SOURCE)" >&2
 115         exit 1
 116 fi
 117
 118 exit 0