oe-init-build-env*: Allow $OEROOT to be predefined

The current implementation of oe-init-build-env and
oe-init-build-env-memres requires that they are sourced from the
directory that will be known as $OEROOT. This makes it hard to write a
wrapper script with the same name as the original OE script which,
e.g., sources the original OE script from a sub-directory.

With this change, $OEROOT can be predefined when oe-init-build-env or
oe-init-build-env-memres is sourced, allowing the original OE scripts
to be anywhere.

(From OE-Core rev: 3327e2a9222004d8ac7974cb1d9fe77c81176cfc)

Signed-off-by: Peter Kjellerstedt <peter.kjellerstedt@axis.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

oe-init-build-env

@@ -26,30 +26,32 @@
 # to sourcing this script.
 #
 if [ -n "$BASH_SOURCE" ]; then
-   OEROOT="`dirname $BASH_SOURCE`"
+    THIS_SCRIPT=$BASH_SOURCE
 elif [ -n "$ZSH_NAME" ]; then
-   OEROOT="`dirname $0`"
+    THIS_SCRIPT=$0
 else
-   OEROOT="`pwd`"
+    THIS_SCRIPT="$(pwd)/oe-init-build-env"
 fi
 if [ -n "$BBSERVER" ]; then
    unset BBSERVER
 fi
-THIS_SCRIPT=$OEROOT/oe-init-build-env
 
 if [ -z "$ZSH_NAME" ] && [ "$0" = "$THIS_SCRIPT" ]; then
    echo "Error: This script needs to be sourced. Please run as '. $THIS_SCRIPT'"
    exit 1
 fi
 
-OEROOT=`readlink -f "$OEROOT"`
+if [ -z "$OEROOT" ]; then
+    OEROOT=$(dirname "$THIS_SCRIPT")
+    OEROOT=$(readlink -f "$OEROOT")
+fi
+unset THIS_SCRIPT
+
 export OEROOT
 . $OEROOT/scripts/oe-buildenv-internal && \
      TEMPLATECONF="$TEMPLATECONF" $OEROOT/scripts/oe-setup-builddir && \
      [ -n "$BUILDDIR" ] && cd "$BUILDDIR"
 unset OEROOT
-unset BBPATH
-unset THIS_SCRIPT
 
 # Shutdown any bitbake server if the BBSERVER variable is not set
 if [ -z "$BBSERVER" ] && [ -f bitbake.lock ] ; then

oe-init-build-env-memres

@@ -34,30 +34,32 @@ else
 fi
 
 if [ -n "$BASH_SOURCE" ]; then
-  OEROOT="`dirname $BASH_SOURCE`"
+    THIS_SCRIPT=$BASH_SOURCE
 elif [ -n "$ZSH_NAME" ]; then
-  OEROOT="`dirname $0`"
+    THIS_SCRIPT=$0
 else
-  OEROOT="`pwd`"
+    THIS_SCRIPT="$(pwd)/oe-init-build-env"
 fi
 if [ -n "$BBSERVER" ]; then
   unset BBSERVER
 fi
 
-THIS_SCRIPT=$OEROOT/oe-init-build-env-memres
 if [ -z "$ZSH_NAME" ] && [ "x$0" = "x$THIS_SCRIPT" ]; then
    echo "Error: This script needs to be sourced. Please run as '. $THIS_SCRIPT'"
    exit 1
 fi
 
-OEROOT=`readlink -f "$OEROOT"`
+if [ -z "$OEROOT" ]; then
+    OEROOT=$(dirname "$THIS_SCRIPT")
+    OEROOT=$(readlink -f "$OEROOT")
+fi
+unset THIS_SCRIPT
+
 export OEROOT
 . $OEROOT/scripts/oe-buildenv-internal && \
     $OEROOT/scripts/oe-setup-builddir && \
     [ -n "$BUILDDIR" ] && cd $BUILDDIR
 unset OEROOT
-unset BBPATH
-unset THIS_SCRIPT
 
 res=1
 if [ -e bitbake.lock ] && grep : bitbake.lock > /dev/null ; then