tools/libclean.sh

   1 #!/bin/sh
   2 #
   3 # find unused shared libraries and remove them, repeat until there are no
   4 # more to remove - david.mccullough@accelecon.com
   5 #
   6
   7 if [ $# -ne 1 ]; then
   8         echo "usage: $0 <romfsdir>" >&2
   9         exit 1
  10 fi
  11
  12 ROMFS="${1:-romfs}"
  13 if [ ! -d "$ROMFS" ]; then
  14         echo "Target directory $ROMFS does nto exist." >&2
  15         exit 1
  16 fi
  17
  18 TMPF=/tmp/$$.find-unused
  19 TMPS=/tmp/$$.find-so
  20 TMPW=/tmp/$$.find-work
  21 trap "rm -f $TMPW $TMPS $TMPF $TMPF.1; exit  0" 0
  22
  23 echo "Cleaning rootfs ($ROMFS) of unused .so files ..."
  24
  25 # find all the shared libs used bya a file
  26 find "$ROMFS" -type f | while read t; do
  27         readelf -d $t 2> /dev/null | grep 'Shared lib' |
  28                 sed -e 's/^.*\[//' -e 's/]$//' | while read c
  29                 do
  30                         echo "$c: $t"
  31                 done
  32 done > $TMPF
  33 find "$ROMFS" -type f -a \( -name '*.so' -o -name '*.so.*' \) > $TMPS
  34
  35 find_symlinks()
  36 {
  37         find=`basename "$1"`
  38         find "$ROMFS" -type l -a \( -name '*.so' -o -name '*.so.*' \) | while read lnk
  39         do
  40                 rf=`readlink -f $lnk`
  41                 #echo "`basename $rf` ---- $find"
  42                 [ "`basename $rf`" = "$find" ] && echo "$lnk"
  43         done
  44 }
  45
  46 find_pattern_in_files()
  47 {
  48         for i in $*
  49         do
  50                 egrep "^$i: " $TMPF
  51         done | awk '{ printf $2 }'
  52         echo
  53 }
  54
  55 while :; do
  56         rm -f $TMPW
  57         while read so; do
  58                 [ -f "$so" ] || continue
  59                 LNKS="`find_symlinks \"$so\"`"
  60
  61                 LOOK="`basename $so`"
  62                 for i in $LNKS
  63                 do
  64                         LOOK="$LOOK `basename $i`"
  65                 done
  66
  67                 # echo "checking $so - $LOOK ..."
  68
  69                 USERS=`find_pattern_in_files "$LOOK"`
  70
  71                 #echo "$so:" $USERS
  72                 if [ -z "$USERS" ]
  73                 then
  74                         case "$so" in
  75                         *plugin*)
  76                                 echo "Skipping plugin file $so"
  77                                 echo "`basename $so`: plugin" >> $TMPF
  78                                 ;;
  79                         *pam_*)
  80                                 echo "Skipping PAM file $so"
  81                                 echo "`basename $so`: PAM" >> $TMPF
  82                                 ;;
  83                         *netfilter*)
  84                                 echo "Skipping netfilter file $so"
  85                                 echo "`basename $so`: netfilter" >> $TMPF
  86                                 ;;
  87                         *)
  88                                 touch $TMPW
  89                                 echo "Removing $so ..."
  90                                 rm -f "$so"
  91                                 # remove reference this file has
  92                                 egrep -v ": $so\$" $TMPF > $TMPF.1
  93                                 cp $TMPF.1 $TMPF
  94                                 rm -f $TMPF.1
  95                                 ;;
  96                         esac
  97                 fi
  98         done < $TMPS
  99         [ -f "$TMPW" ] || break
 100 done
 101
 102 exit 0