kumquat-buildroot/support/dependencies/check-host-tar.sh
Thomas De Schampheleire fd10b42ab8 dependencies: build a host-tar if no suitable tar can be found
Some toolchains, like the one built with buildroot itself, use hardlinks (for
example to link between the c++ and g++ binary). Unpacking such a toolchain
with the --strip-components options does not work correctly if the system tar
is too old (<1.17). Even recent releases of RedHat/CentOS still ship with
tar 1.15.

This patch checks for a suitable tar version (tar 1.17+) on the host system,
and adds host-tar to the host dependencies if none can be found.

host-tar is download and extracted as cpio.gz instead of tar.gz, to prevent
chicken-egg problem.

Signed-off-by: Thomas De Schampheleire <thomas.de.schampheleire@gmail.com>
v4 Acked-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
2012-02-09 22:59:21 +01:00

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#!/bin/sh
candidate="$1"
tar=`which $candidate`
if [ ! -x "$tar" ]; then
tar=`which tar`
if [ ! -x "$tar" ]; then
# echo nothing: no suitable tar found
exit 1
fi
fi
# Output of 'tar --version' examples:
# tar (GNU tar) 1.15.1
# tar (GNU tar) 1.25
version=`$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`
# Minimal version = 1.17 (previous versions do not correctly unpack archives
# containing hard-links if the --strip-components option is used).
major_min=1
minor_min=17
if [ $major -gt $major_min ]; then
echo $tar
else
if [ $major -eq $major_min -a $minor -ge $minor_min ]; then
echo $tar
else
# echo nothing: no suitable tar found
exit 1
fi
fi