From 47f728718f2a0bf3df7ae748e689edd5dd8045ba Mon Sep 17 00:00:00 2001
From: Simon Butcher <simon.butcher@arm.com>
Date: Mon, 16 Mar 2020 11:30:46 +0000
Subject: [PATCH] Change the use of pylint to optionally use pylint3

Pylint when installed as a distro package can be installed as pylint3, whilst as
a PEP egg, it can be installed as pylint.

This commit changes the scripts to first use pylint if installed, and optionally
look for pylint3 if not installed. This is to allow a preference for the PEP
version over the distro version, assuming the PEP one is more likely to be
the correct one.

Signed-off-by: Simon Butcher <simon.butcher@arm.com>
---
 scripts/output_env.sh               | 11 ++++++++++-
 tests/scripts/all.sh                |  8 +++++++-
 tests/scripts/check-python-files.sh | 13 ++++++++++++-
 3 files changed, 29 insertions(+), 3 deletions(-)

diff --git a/scripts/output_env.sh b/scripts/output_env.sh
index 0e0679479..04edc3812 100755
--- a/scripts/output_env.sh
+++ b/scripts/output_env.sh
@@ -105,7 +105,16 @@ echo
 print_version "python" "--version" "" "head -n 1"
 echo
 
-print_version "pylint3" "--version" "" "sed /^.*config/d" "grep pylint"
+# Find the installed version of Pylint. Installed as a distro package this can
+# be pylint3 and as a PEP egg, pylint. In test scripts We prefer pylint over
+# pylint3
+if type pylint >/dev/null 2>/dev/null; then
+    print_version "pylint" "--version" "" "sed /^.*config/d" "grep pylint"
+elif type pylint3 >/dev/null 2>/dev/null; then
+    print_version "pylint3" "--version" "" "sed /^.*config/d" "grep pylint"
+else
+    echo " * pylint or pylint3: Not found."
+fi
 echo
 
 : ${OPENSSL:=openssl}
diff --git a/tests/scripts/all.sh b/tests/scripts/all.sh
index 062b2eb12..dd8f510dd 100755
--- a/tests/scripts/all.sh
+++ b/tests/scripts/all.sh
@@ -1410,7 +1410,13 @@ component_test_zeroize () {
 }
 
 support_check_python_files () {
-    type pylint3 >/dev/null 2>/dev/null
+    # Find the installed version of Pylint. Installed as a distro package this can
+    # be pylint3 and as a PEP egg, pylint.
+    if type pylint >/dev/null 2>/dev/null || type pylint3 >/dev/null 2>/dev/null; then
+        true;
+    else
+        false;
+    fi
 }
 component_check_python_files () {
     msg "Lint: Python scripts"
diff --git a/tests/scripts/check-python-files.sh b/tests/scripts/check-python-files.sh
index 929041822..6b864d264 100755
--- a/tests/scripts/check-python-files.sh
+++ b/tests/scripts/check-python-files.sh
@@ -9,4 +9,15 @@
 # Run 'pylint' on Python files for programming errors and helps enforcing
 # PEP8 coding standards.
 
-pylint3 -j 2 scripts/*.py tests/scripts/*.py
+# Find the installed version of Pylint. Installed as a distro package this can
+# be pylint3 and as a PEP egg, pylint. We prefer pylint over pylint3
+if type pylint >/dev/null 2>/dev/null; then
+    PYLINT=pylint
+elif type pylint3 >/dev/null 2>/dev/null; then
+    PYLINT=pylint3
+else
+    echo 'Pylint was not found.'
+    exit 1
+fi
+
+$PYLINT -j 2 scripts/*.py tests/scripts/*.py