initramfs.sh

   1 #!/bin/bash
   2
   3 source sources/include.sh || exit 1
   4
   5 cd $TOP || dienow
   6
   7 # copy root overlay
   8
   9 tar -C "$ROOT_OVERLAY" -cf - . | tar -C "$ROOT_DIR" -xf -
  10
  11 libs=""
  12
  13 # remove all shared libraries which aren't needed
  14
  15 if [ -z "$NO_STRIP" ]; then
  16
  17 # get library dependencies of binaries
  18
  19 for f in `find $ROOT_DIR/usr/bin $ROOT_DIR/usr/sbin -type f -perm +0111`; do
  20         if [ ! -z "`file $f | grep ELF | grep executable`" ]; then
  21                 for l in `${CROSS}objdump -p $f | awk '/NEEDED/ { print $2 }'`; do
  22                         libs="$libs $l"
  23                 done
  24         fi
  25 done
  26
  27 # get dependencies of the dependencies (should use recursion)
  28
  29 for l in `find $ROOT_DIR/usr/lib -type f -perm +0111`; do
  30         soname="`${CROSS}objdump -p $l | awk '/SONAME/ { print $2 }'`"
  31         if [[ ! -z $soname && ! -z "`echo $libs | grep $soname`" ]]; then
  32                 needed="`${CROSS}objdump -p $l | awk '/NEEDED/ { print $2 }'`"
  33                 libs="$libs $needed"
  34         fi
  35 done
  36
  37 # remove unused sub directories which contain plugin/modules
  38
  39 for l in `find $ROOT_DIR/usr/lib -mindepth 1 -maxdepth 1 -type d -perm +0111`; do
  40         if [ ! -z "`echo $libs | grep $l`" ]; then
  41                 echo deleteing $l
  42                 rm -rf "$l"
  43         else
  44                 # modules required so get all dependencies
  45                 for m in `find $l -type f -perm +0111`; do
  46                         for ml in `${CROSS}objdump -p $m | awk '/NEEDED/ { print $2 }'`; do
  47                                 libs="$libs $ml"
  48                         done
  49                 done
  50         fi
  51 done
  52
  53 # delete all libraries which aren't referenced by others
  54
  55 for l in `find $ROOT_DIR/usr/lib -maxdepth 1 ! -type d -perm +0111`; do
  56         if [ ! -e "$l" ]; then # remove broken symlinks
  57                 rm -f "$l"
  58         else
  59                 soname="`${CROSS}objdump -p $l | awk '/SONAME/ { print $2 }' 2> /dev/null`"
  60                 if [[ ! -z $soname && -z "`echo $libs | grep $soname`" ]]; then
  61                         rm "$l"
  62                 fi
  63         fi
  64 done
  65
  66 # strip binaries and libraries
  67
  68 ${STRIP} -s -R .note -R .comment "$ROOT_DIR"/usr/{bin/*,sbin/*} 2> /dev/null
  69 find "$ROOT_DIR/usr/lib" -name '*.so' | xargs ${STRIP} --strip-unneeded 2>/dev/null
  70 [ -e "$ROOT_DIR/lib/modules" ] &&  find "$ROOT_DIR/lib/modules" -name '*.ko' | xargs ${STRIP}
  71
  72 # remove libthread_db which is used for cross debuging with gdb
  73 rm -f "$ROOT_DIR"/lib/libthread_db*
  74
  75 fi # $NO_STRIP
  76
  77 # generate file with the contents of the initramfs it's later used
  78 # by the kernel build system to create a gziped cpio archive which
  79 # is then embedded into the kernel binary.
  80
  81 $SCRIPTS/gen_initramfs_list.sh -u squash -g squash $ROOT_DIR > \
  82         initramfs-files
  83
  84 echo "Now run './build.sh kernel' which will build a kernel with initramfs-files as"
  85 echo "CONFIG_INITRAMFS_SOURCE or run ./package.sh to create a rootfs.tar.gz tarball"
  86 echo "that you can extract on a SD card."