[PATCH] Support python in other than /usr/bin/python

[Ed Maste]

Hi samsonov,

Use /usr/local/bin/python if it exists and /usr/bin/python does not.  If that also does not exist, try python from $PATH.

This allows check_lint.sh to work on FreeBSD without the need to manually specify PYTHON_EXECUTABLE.

http://reviews.llvm.org/D9914

Files:
  lib/sanitizer_common/scripts/check_lint.sh

Index: lib/sanitizer_common/scripts/check_lint.sh
===================================================================
--- lib/sanitizer_common/scripts/check_lint.sh
+++ lib/sanitizer_common/scripts/check_lint.sh
@@ -10,6 +10,17 @@
 # python tools setup
 CPPLINT=${SCRIPT_DIR}/cpplint.py
 LITLINT=${SCRIPT_DIR}/litlint.py
+if [ -z "${PYTHON_EXECUTABLE}" ] && [ ! -x /usr/bin/python ]; then
+  if [ -x /usr/local/bin/python ]; then
+    PYTHON_EXECUTABLE=/usr/local/bin/python
+  elif PYTHON_EXECUTABLE=$(which python 2>/dev/null); then
+    echo "Using python executable $PYTHON_EXECUTABLE from \$PATH."
+  else
+    echo "Python not found in /usr/bin/python, /usr/local/bin/python, or \$PATH."
+    echo "Set the PYTHON_EXECUTABLE environment variable to the path to your python."
+    exit 1
+  fi
+fi
 if [ "${PYTHON_EXECUTABLE}" != "" ]; then
   CPPLINT="${PYTHON_EXECUTABLE} ${CPPLINT}"
   LITLINT="${PYTHON_EXECUTABLE} ${LITLINT}"

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