[PATCH v2] scripts: Avoid adding duplicate entries to PATH

[vijaikumar.kanagarajan@gmail.com]

From: Vijai Kumar K <Vijaikumar_Kanagarajan@mentor.com>

If the setup script is run multiple times in the same shell session,
PATH variable gets overpopulated with duplicate entries. Remove any
existing entries before adding.

Signed-off-by: Vijai Kumar K <Vijaikumar_Kanagarajan@mentor.com>
---
Changes in v2:
- Unset newpath

 scripts/isar-buildenv-internal | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/scripts/isar-buildenv-internal b/scripts/isar-buildenv-internal
index 2186e40..72a91ab 100755
--- a/scripts/isar-buildenv-internal
+++ b/scripts/isar-buildenv-internal
@@ -60,7 +60,15 @@ unset BDIR
 
 export BUILDDIR
 
-PATH=$ISARROOT/bitbake/bin:$ISARROOT/scripts:$PATH
+for newpath in "$ISARROOT/bitbake/bin" "$ISARROOT/scripts"; do
+    # Remove any existences of $newpath from $PATH
+    PATH=$(echo $PATH | sed -re "s#(^|:)$newpath(:|$)#\2#g;s#^:##")
+
+    # Add $newpath to $PATH
+    PATH="$newpath:$PATH"
+done
+unset newpath
+
 export PATH
 
 BBPATH="${BUILDDIR}"
-- 
2.17.1