src/stripper

   1 #!/usr/bin/env bash
   2
   3 dirs=""
   4 excludes="/dev /proc /sys /run"
   5
   6 while [ $# -gt 0 ]; do
   7         case "${1}" in
   8                 --exclude=*)
   9                         excludes="${excludes} ${1#*=}"
  10                         ;;
  11                 *)
  12                         dirs="${dirs} ${1}"
  13                         ;;
  14         esac
  15         shift
  16 done
  17
  18 function _strip() {
  19         local file=${1}
  20         local strip="${STRIP-strip}"
  21
  22         local exclude l
  23         for exclude in ${excludes}; do
  24                 l=${#exclude}
  25                 if [ "${file:0:${l}}" = "${exclude}" ]; then
  26                         return 0
  27                 fi
  28         done
  29
  30         # Fetch any capabilities
  31         local capabilities="$(getfattr --no-dereference --name="security.capability" \
  32                 --absolute-names --dump "${file}")"
  33
  34         local cmd=( "${strip}" )
  35
  36         case "$(file -bi ${file})" in
  37                 application/x-archive*)
  38                         cmd+=( "--strip-debug" "--remove-section=.comment" "--remove-section=.note" )
  39                         ;;
  40                 *)
  41                         cmd+=( "--strip-all" )
  42                         ;;
  43         esac
  44
  45         echo "Stripping ${file}..."
  46         ${cmd[*]} ${file}
  47
  48         # Restore capabilities
  49         if [ -n "${capabilities}" ]; then
  50                 setfattr --no-dereference --restore=<(echo "${capabilities}")
  51         fi
  52 }
  53
  54 for dir in ${dirs}; do
  55         # Strip shared objects.
  56         find ${dir} -type f \( -perm -0100 -or -perm -0010 -or -perm -0001 \) \
  57                 | file -N -f - | sed -n -e 's/^\(.*\):[   ]*.*ELF.*, not stripped.*/\1/p' |
  58                 while read file; do
  59                         _strip ${file} || exit $?
  60                 done || exit $?
  61
  62         # Strip static archives.
  63         find ${dir} -name \*.a -a -exec file {} \; \
  64                 | grep 'current ar archive' | sed -n -e 's/^\(.*\):[    ]*current ar archive/\1/p' |
  65                 while read file; do
  66                         _strip ${file} || exit $?
  67                 done || exit $?
  68 done