[yocto] [opkg-utils PATCH] opkg-build: add detection if using GNU tar.

[tom at ewsting.org]

From: Thomas Ingleby <thomas.c.ingleby at intel.com>

* Some options of GNU tar do not exist on other implementations

Signed-off-by: Thomas Ingleby <thomas.c.ingleby at intel.com>
---
 opkg-build | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/opkg-build b/opkg-build
index e314712..8abc14d 100755
--- a/opkg-build
+++ b/opkg-build
@@ -159,6 +159,17 @@ ogargs=""
 outer=ar
 noclean=0
 opkext=0
+
+tarformat=""
+#Probably not the best way to detect if running on a system without full GNU tar
+set +e
+tar --help | grep "format" &> /dev/null
+if [ $? -eq 0 ]
+then
+    tarformat="--format=gnu"
+fi
+set -e
+
 usage="Usage: $0 [-c] [-C] [-O] [-o owner] [-g group] <pkg_directory> [<destination_directory>]"
 while getopts "cCg:ho:vO" opt; do
     case $opt in
@@ -233,8 +244,8 @@ tmp_dir=$dest_dir/IPKG_BUILD.$$
 mkdir $tmp_dir
 
 echo $CONTROL > $tmp_dir/tarX
-( cd $pkg_dir && tar $ogargs -X $tmp_dir/tarX -cz --format=gnu -f $tmp_dir/data.tar.gz . )
-( cd $pkg_dir/$CONTROL && tar $ogargs -cz --format=gnu -f $tmp_dir/control.tar.gz . )
+( cd $pkg_dir && tar $ogargs -X $tmp_dir/tarX -cz $tarformat -f $tmp_dir/data.tar.gz . )
+( cd $pkg_dir/$CONTROL && tar $ogargs -cz $tarformat -f $tmp_dir/control.tar.gz . )
 rm $tmp_dir/tarX
 
 echo "2.0" > $tmp_dir/debian-binary
@@ -249,7 +260,7 @@ rm -f $pkg_file
 if [ "$outer" = "ar" ] ; then
   ( cd $tmp_dir && ar -crf $pkg_file ./debian-binary ./control.tar.gz ./data.tar.gz )
 else
-  ( cd $tmp_dir && tar -cz --format=gnu -f $pkg_file ./debian-binary ./control.tar.gz ./data.tar.gz )
+  ( cd $tmp_dir && tar -cz $tarformat -f $pkg_file ./debian-binary ./control.tar.gz ./data.tar.gz )
 fi
 
 rm $tmp_dir/debian-binary $tmp_dir/data.tar.gz $tmp_dir/control.tar.gz
-- 
1.9.2