ci: run more tests on boards that have changed

Check if any board files have changed and build more tests with this
board to uncover any build regressions.

Signed-off-by: Anas Nashif <anas.nashif@intel.com>
diff --git a/scripts/ci/get_modified_boards.py b/scripts/ci/get_modified_boards.py
new file mode 100755
index 0000000..5265a07
--- /dev/null
+++ b/scripts/ci/get_modified_boards.py
@@ -0,0 +1,74 @@
+#!/usr/bin/env python3
+
+# A script to generate a list of boards that have changed or added and create an
+# arguemnts file for sanitycheck to allow running more tests for those boards.
+
+import sys
+import re, os
+from email.utils import parseaddr
+import sh
+import logging
+import argparse
+
+if "ZEPHYR_BASE" not in os.environ:
+    logging.error("$ZEPHYR_BASE environment variable undefined.\n")
+    exit(1)
+
+logger = None
+
+repository_path = os.environ['ZEPHYR_BASE']
+sh_special_args = {
+    '_tty_out': False,
+    '_cwd': repository_path
+}
+
+def init_logs():
+    log_lev = os.environ.get('LOG_LEVEL', None)
+    level = logging.INFO
+    global logger
+
+    if log_lev == "DEBUG":
+        level = logging.DEBUG
+    elif log_lev == "ERROR":
+        level = logging.ERROR
+
+    console = logging.StreamHandler()
+    format = logging.Formatter('%(levelname)-8s: %(message)s')
+    console.setFormatter(format)
+    logger = logging.getLogger('')
+    logger.addHandler(console)
+    logger.setLevel(level)
+
+    logging.debug("Log init completed")
+
+def parse_args():
+    parser = argparse.ArgumentParser(
+                description="Generate a sanitycheck argument for for boards "
+                            " that have changed")
+    parser.add_argument('-c', '--commits', default=None,
+            help="Commit range in the form: a..b")
+    return parser.parse_args()
+
+def main():
+    boards = set()
+
+    args = parse_args()
+    if not args.commits:
+        exit(1)
+
+    commit = sh.git("diff","--name-only", args.commits, **sh_special_args)
+    files = commit.split("\n")
+
+    for f in files:
+        p = re.match("^boards\/[^/]+\/([^/]+)\/", f)
+        if p and p.groups():
+            boards.add(p.group(1))
+
+    if boards:
+        print("-p\n%s" %("\n-p\n".join(boards)))
+
+
+
+if __name__ == "__main__":
+    main()
+