oe-buildenv-internal: Only add to $PATH if needed

If $PATH already has the needed paths at the beginning, there is no need
to add them again. This allows rerunning oe-init-build-env for the same
directory without having $PATH increase unnecessarily every time.

(From OE-Core rev: 161abcd3672f83990ede03d67b7388678c07150e)

Signed-off-by: Peter Kjellerstedt <pkj@axis.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

diff --git a/scripts/oe-buildenv-internal b/scripts/oe-buildenv-internal
index 0a4d324..df95389 100755 (executable)
--- a/scripts/oe-buildenv-internal
+++ b/scripts/oe-buildenv-internal
@@ -74,8 +74,9 @@ if ! (test -d "$BITBAKEDIR"); then
     return 1
 fi
 
-PATH="${OEROOT}/scripts:$BITBAKEDIR/bin/:$PATH"
-unset BITBAKEDIR
+NEWPATHS="${OEROOT}/scripts:$BITBAKEDIR/bin/:"
+[ "${PATH#$NEWPATHS}" != "$PATH" ] || PATH="$NEWPATHS$PATH"
+unset BITBAKEDIR NEWPATHS
 
 # Used by the runqemu script
 export BUILDDIR