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 parse() {
  41         local location="$1"
  42         local name="${location/${srcdir}//}"
  43         local mode="$2"
  44         local uid="$3"
  45         local gid="$4"
  46         local ftype=$(filetype "${location}")
  47         local str="${mode} ${uid} ${gid}"
  48
  49         [ "${ftype}" == "invalid" ] && return 0
  50         [ "${location}" == "${srcdir}" ] && return 0
  51
  52         case "${ftype}" in
  53                 "file")
  54                         str="${ftype} ${name} ${location} ${str}"
  55                         ;;
  56                 "nod")
  57                         local dev_type=
  58                         local maj=$(LC_ALL=C ls -l "${location}" | \
  59                                         gawk '{sub(/,/, "", $5); print $5}')
  60                         local min=$(LC_ALL=C ls -l "${location}" | \
  61                                         gawk '{print $6}')
  62
  63                         if [ -b "${location}" ]; then
  64                                 dev_type="b"
  65                         else
  66                                 dev_type="c"
  67                         fi
  68                         str="${ftype} ${name} ${str} ${dev_type} ${maj} ${min}"
  69                         ;;
  70                 *)
  71                         str="${ftype} ${name} ${str}"
  72                         ;;
  73         esac
  74
  75         echo "${str}"
  76
  77         return 0
  78 }
  79
  80 if [ -z $1 ]; then
  81         simple_initramfs
  82 elif [ -f $1 ]; then
  83         cat $1
  84 elif [ -d $1 ]; then
  85         srcdir=$(echo "$1" | sed -e 's://*:/:g')
  86         dirlist=$(find "${srcdir}" -printf "%p %m %U %G\n" 2>/dev/null)
  87
  88         # If $dirlist is only one line, then the directory is empty
  89         if [  "$(echo "${dirlist}" | wc -l)" -gt 1 ]; then
  90                 echo "${dirlist}" | \
  91                 while read x; do
  92                         parse ${x}
  93                 done
  94         else
  95                 # Failsafe in case directory is empty
  96                 simple_initramfs
  97         fi
  98 else
  99         echo "  $0: Cannot open '$1' (CONFIG_INITRAMFS_SOURCE)" >&2
 100         exit 1
 101 fi
 102
 103 exit 0