lib/overlay/overlay-functions.in

   1 # --- SDE-COPYRIGHT-NOTE-BEGIN ---
   2 # This copyright note is auto-generated by ./scripts/Create-CopyPatch.
   3 #
   4 # Filename: lib/overlay/overlay-functions.in
   5 # Copyright (C) 2007 - 2008 The OpenSDE Project
   6 #
   7 # More information can be found in the files COPYING and README.
   8 #
   9 # This program is free software; you can redistribute it and/or modify
  10 # it under the terms of the GNU General Public License as published by
  11 # the Free Software Foundation; version 2 of the License. A copy of the
  12 # GNU General Public License can be found in the file COPYING.
  13 # --- SDE-COPYRIGHT-NOTE-END ---
  14
  15 # returns the type of overlay based on the extension of the overlay file
  16 #
  17 overlay_get_type()
  18 {
  19         local ext="${1##*.}"
  20
  21         case "$ext" in
  22                 sh|exec)        echo "exec"     ;;
  23                 txt|patch|ln)   echo "$ext"     ;;
  24                 *)      # and skip anything else
  25                         ;;
  26         esac
  27 }
  28
  29 # returns the name of a target file based on the name overlay file
  30 #
  31 overlay_get_filename()
  32 {
  33         local filename="${1##*/}"; filename="${filename%.*}"
  34
  35         # rock_substitute will add a leading / for most translations
  36         echo "${filename}" | tr '_%' '/_' | rock_substitute | sed -e 's,^/,,'
  37 }
  38
  39 # apply an overlay dir
  40 overlay_apply() {
  41         local overlaydir="$1" rootfs="${2:-$root}"
  42         local file= source= target= ext=
  43         local type= mode= ref= targetdir=
  44
  45         for file in "$overlaydir"/*; do
  46                 # only consider known overlay types
  47                 type=$( overlay_get_type "$file" )
  48                 [ -n "$type" ] || continue
  49
  50                 # full filename of the target file, and it's directory
  51                 target=$( overlay_get_filename "$file" )
  52                 targetdir="$rootfs/$target"; targetdir="${targetdir%/*}"
  53
  54                 # final adjustments based on the type
  55                 case "$type" in
  56                         exec)   mode=0755 ;;
  57                         *)      mode=0644 ;;
  58                 esac
  59
  60                 # and finally inject the file
  61                 case "$type" in
  62                         exec|txt)
  63                                 echo_status "injecting $target ($type)"
  64                                 mkdir -p "$targetdir"
  65                                 [ ! -e "$rootfs/$target" ] || rm -f "$rootfs/$target"
  66                                 cp -f "$file" "$rootfs/$target"
  67                                 chmod $mode "$rootfs/$target"
  68                                 ;;
  69                         ln)     ref=$( cat "$file" )
  70                                 echo_status "injecting $target -> $ref"
  71                                 mkdir -p "$targetdir"
  72                                 ln -snf "$ref" "$rootfs/$target"
  73                                 ;;
  74                         patch)
  75                                 echo_status "$(patch -p1 -d "${rootfs}" 2>&1 < $file )"
  76                                 ;;
  77                 esac
  78         done
  79 }
  80