| #!/bin/sh |
| |
| candidate="$1" |
| |
| tar=`which $candidate` |
| if [ ! -x "$tar" ]; then |
| tar=`which tar` |
| if [ ! -x "$tar" ]; then |
| # echo nothing: no suitable tar found |
| exit 1 |
| fi |
| fi |
| |
| # Output of 'tar --version' examples: |
| # tar (GNU tar) 1.15.1 |
| # tar (GNU tar) 1.25 |
| # bsdtar 2.8.3 - libarchive 2.8.3 |
| version=`$tar --version | head -n 1 | sed 's/^.*\s\([0-9]\+\.\S\+\).*$/\1/'` |
| major=`echo "$version" | cut -d. -f1` |
| minor=`echo "$version" | cut -d. -f2` |
| bugfix=`echo "$version" | cut -d. -f3` |
| version_bsd=`$tar --version | grep 'bsdtar'` |
| |
| # BSD tar does not have all the command-line options |
| if [ -n "${version_bsd}" ] ; then |
| # echo nothing: no suitable tar found |
| exit 1 |
| fi |
| |
| # Minimal version = 1.27 (previous versions do not correctly unpack archives |
| # containing hard-links if the --strip-components option is used or create |
| # different gnu long link headers for path elements > 100 characters). |
| major_min=1 |
| minor_min=27 |
| |
| if [ $major -lt $major_min ]; then |
| # echo nothing: no suitable tar found |
| exit 1 |
| fi |
| |
| if [ $major -eq $major_min -a $minor -lt $minor_min ]; then |
| # echo nothing: no suitable tar found |
| exit 1 |
| fi |
| |
| # valid |
| echo $tar |
