perf test: Add an 'import perf' test shell script

The 'import perf' test needs to set up a path to the python module as
well as to know the python command to invoke.

These are hard coded at build time to be build a directory and the
python used in the build, which is less than desirable.

Avoid the hard coded values by reusing the existing shell script python
setup and determine a potential built python module via the path of the
perf executable.

Signed-off-by: Ian Rogers <[e-mail]>
Tested-by: Arnaldo Carvalho de Melo <[e-mail]>
Cc: Adrian Hunter <[e-mail]>
Cc: Alexander Shishkin <[e-mail]>
Cc: Collin Funk <[e-mail]>
Cc: Ingo Molnar <[e-mail]>
Cc: James Clark <[e-mail]>
Cc: Jiri Olsa <[e-mail]>
Cc: Kan Liang <[e-mail]>
Cc: Mark Rutland <[e-mail]>
Cc: Namhyung Kim <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Cc: Ravi Bangoria <[e-mail]>
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/tests/shell/python-use.sh

···
+#!/bin/bash
+# 'import perf' in python
+# SPDX-License-Identifier: GPL-2.0
+# Just test if we can load the python binding.
+set -e
+
+shelldir=$(dirname "$0")
+# shellcheck source=lib/setup_python.sh
+. "${shelldir}"/lib/setup_python.sh
+
+MODULE_DIR=$(dirname "$(which perf)")/python
+
+if [ -d "$MODULE_DIR" ]
+then
+    CMD=$(cat <<EOF
+import sys
+sys.path.insert(0, '$MODULE_DIR')
+import perf
+print('success!')
+EOF
+    )
+else
+    CMD=$(cat <<EOF
+import perf
+print('success!')
+EOF
+    )
+fi
+
+echo -e "Testing 'import perf' with:\n$CMD"
+
+if ! echo "$CMD" | $PYTHON | grep -q "success!"
+then
+  exit 1
+fi
+exit 0