poky-init-build-env: Enable all POSIX shells

Update the script so that it will work in more then just bash.  If bash
is not used, it will assume the PWD is the Poky location.  (This is because
BASH_SOURCE is a bash-ism, and equivalent functionality is not available in
other shells).

This has been verified with dash (see comment in the code), ksh, zsh and
of course bash.

Signed-off-by: Mark Hatle <mark.hatle@windriver.com>

poky-init-build-env

@@ -18,13 +18,21 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 
-
+#
+# Normally this is called as '. ./poky-init-buildenv builddir'
+#
+# This works in most shells (not dash), but not all of them pass arg1 when
+# being sourced.   To workaround the shell limitation use "set arg1" prior 
+# to sourcing this script.
+#
 if [ "x$0" = "x./poky-init-build-env" ]; then
    echo "Error: This script needs to be sourced. Please run as '. ./poky-init-build-env'"
-elif [ "x$BASH_SOURCE" = "x" ]; then
-   echo "Error: You are not running a Bash shell. Please use Bash or add support for your shell to the init scripts"
 else
-   OEROOT="`dirname $BASH_SOURCE`"
+   if [ -n "$BASH_SOURCE" ]; then
+      OEROOT="`dirname $BASH_SOURCE`"
+   else
+      OEROOT="`pwd`"
+   fi
    OEROOT=`readlink -f "$OEROOT"`
    export OEROOT
    . $OEROOT/scripts/poky-env-internal

scripts/poky-env-internal

@@ -31,7 +31,7 @@ if [ "x$BDIR" = "x" ]; then
         BDIR=`readlink -f "$1"`
     fi
 fi
-if [[ "$BDIR" = /* ]] ; then
+if expr "$BDIR" : '/.*' > /dev/null ; then
     BUILDDIR="$BDIR"
 else
     BUILDDIR="`pwd`/$BDIR"