support/dependencies/check-host-tar.sh

   1 #!/bin/sh
   2
   3 candidate="$1"
   4
   5 tar=`which $candidate`
   6 if [ ! -x "$tar" ]; then
   7         tar=`which tar`
   8         if [ ! -x "$tar" ]; then
   9                 # echo nothing: no suitable tar found
  10                 exit 1
  11         fi
  12 fi
  13
  14 # Output of 'tar --version' examples:
  15 # tar (GNU tar) 1.15.1
  16 # tar (GNU tar) 1.25
  17 # bsdtar 2.8.3 - libarchive 2.8.3
  18 version=`$tar --version | head -n 1 | sed 's/^.*\s\([0-9]\+\.\S\+\).*$/\1/'`
  19 major=`echo "$version" | cut -d. -f1`
  20 minor=`echo "$version" | cut -d. -f2`
  21 bugfix=`echo "$version" | cut -d. -f3`
  22 version_bsd=`$tar --version | grep 'bsdtar'`
  23 if [ ! -z "${version_bsd}" ] ; then
  24   # mark as invalid version - not all command line options are available
  25   major=0
  26   minor=0
  27 fi
  28
  29 # Minimal version = 1.17 (previous versions do not correctly unpack archives
  30 # containing hard-links if the --strip-components option is used).
  31 major_min=1
  32 minor_min=17
  33 if [ $major -gt $major_min ]; then
  34         echo $tar
  35 else
  36         if [ $major -eq $major_min -a $minor -ge $minor_min ]; then
  37                 echo $tar
  38         else
  39                 # echo nothing: no suitable tar found
  40                 exit 1
  41         fi
  42 fi