scripts/bundle-libraries.sh

   1 #!/usr/bin/env bash
   2 #
   3 #   Script to install host system binaries along with required libraries.
   4 #
   5 #   Copyright (C) 2012-2017 Jo-Philipp Wich <jo@mein.io>
   6 #
   7 #   This program is free software; you can redistribute it and/or modify
   8 #   it under the terms of the GNU General Public License as published by
   9 #   the Free Software Foundation; either version 2 of the License, or
  10 #   (at your option) any later version.
  11 #
  12 #   This program is distributed in the hope that it will be useful,
  13 #   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 #   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 #   GNU General Public License for more details.
  16 #
  17 #   You should have received a copy of the GNU General Public License
  18 #   along with this program; if not, write to the Free Software
  19 #   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20
  21 DIR="$1"; shift
  22
  23 _cp() {
  24         cp ${VERBOSE:+-v} -L "$1" "$2" || {
  25                 echo "cp($1 $2) failed" >&2
  26                 exit 1
  27         }
  28 }
  29
  30 _mv() {
  31         mv ${VERBOSE:+-v} "$1" "$2" || {
  32                 echo "mv($1 $2) failed" >&2
  33                 exit 1
  34         }
  35 }
  36
  37 _md() {
  38         mkdir ${VERBOSE:+-v} -p "$1" || {
  39                 echo "mkdir($1) failed" >&2
  40                 exit 2
  41         }
  42 }
  43
  44 _ln() {
  45         ln ${VERBOSE:+-v} -sf "$1" "$2" || {
  46                 echo "ln($1 $2) failed" >&2
  47                 exit 3
  48         }
  49 }
  50
  51 _relpath() {
  52         local base="$(readlink -f "$1")"
  53         local dest="$(readlink -f "$2")"
  54         local up
  55
  56         [ -d "$base" ] || base="${base%/*}"
  57         [ -d "$dest" ] || dest="${dest%/*}"
  58
  59         while true; do
  60                 case "$base"
  61                         in "$dest"/*)
  62                                 echo "$up/${base#$dest/}"
  63                                 break
  64                         ;;
  65                         *)
  66                                 dest="${dest%/*}"
  67                                 up="${up:+$up/}.."
  68                         ;;
  69                 esac
  70         done
  71 }
  72
  73 _wrapper() {
  74         cat <<-EOT | ${CC:-gcc} -x c -o "$1" -
  75                 #include <unistd.h>
  76                 #include <stdio.h>
  77
  78                 int main(int argc, char **argv) {
  79                         const char *self   = argv[0];
  80                         const char *target = argv[1];
  81
  82                         if (argc < 3) {
  83                                 fprintf(stderr, "Usage: %s executable arg0 [args...]\n", self);
  84                                 return 1;
  85                         }
  86
  87                         return execv(target, argv + 2);
  88                 }
  89         EOT
  90
  91         [ -x "$1" ] || {
  92                 echo "compiling wrapper failed" >&2
  93                 exit 5
  94         }
  95 }
  96
  97 for LDD in ${PATH//://ldd }/ldd; do
  98         "$LDD" --version >/dev/null 2>/dev/null && break
  99         LDD=""
 100 done
 101
 102 [ -n "$LDD" -a -x "$LDD" ] || LDD=
 103
 104 for BIN in "$@"; do
 105         [ -n "$BIN" -a -n "$DIR" ] || {
 106                 echo "Usage: $0 <destdir> <executable> ..." >&2
 107                 exit 1
 108         }
 109
 110         [ ! -d "$DIR/lib" ] && {
 111                 _md "$DIR/lib"
 112                 _md "$DIR/usr"
 113                 _ln "../lib" "$DIR/usr/lib"
 114         }
 115
 116         [ ! -x "$DIR/lib/runas" ] && {
 117                 _wrapper "$DIR/lib/runas"
 118         }
 119
 120         LDSO=""
 121
 122         [ -n "$LDD" ] && [ -x "$BIN" ] && file "$BIN" | grep -sqE "ELF.*executable" && {
 123                 for token in $("$LDD" "$BIN" 2>/dev/null); do
 124                         case "$token" in */*.so*)
 125                                 case "$token" in
 126                                         *ld-*.so*) LDSO="${token##*/}" ;;
 127                                 esac
 128
 129                                 dest="$DIR/lib/${token##*/}"
 130                                 ddir="${dest%/*}"
 131
 132                                 [ -f "$token" -a ! -f "$dest" ] && {
 133                                         _md "$ddir"
 134                                         _cp "$token" "$dest"
 135                                 }
 136                         ;; esac
 137                 done
 138         }
 139
 140         # is a dynamically linked executable
 141         if [ -n "$LDSO" ]; then
 142                 echo "Bundling ${BIN##*/}"
 143
 144                 RUNDIR="$(readlink -f "$BIN")"; RUNDIR="${RUNDIR%/*}"
 145                 RUN="${LDSO#ld-}"; RUN="run-${RUN%%.so*}.sh"
 146                 REL="$(_relpath "$DIR/lib" "$BIN")"
 147
 148                 _mv "$BIN" "$RUNDIR/.${BIN##*/}.bin"
 149
 150                 cat <<-EOF > "$BIN"
 151                         #!/usr/bin/env bash
 152                         dir="\$(dirname "\$0")"
 153                         exec "\$dir/${REL:+$REL/}$LDSO" --library-path "\$dir/${REL:+$REL/}" "\$dir/${REL:+$REL/}runas" "\$dir/.${BIN##*/}.bin" "\$0" "\$@"
 154                 EOF
 155
 156                 chmod ${VERBOSE:+-v} 0755 "$BIN"
 157         fi
 158 done