added support scripts

Change-Id: I875972813927dd4ace2c7f710b73085ba16ba45c

tools/pre-commit-hook

@@ -0,0 +1,28 @@
+#!/bin/sh
+
+TOPLEVEL=$(git rev-parse --show-toplevel)
+RES=0
+
+cd $TOPLEVEL
+
+if [ "$1" = "--install" ]; then
+    ln -sf ../../tools/pre-commit-hook .git/hooks/pre-commit
+    exit
+fi
+
+tmpdir=$(mktemp -d precommit.XXXXXX) || exit 1
+trap "rm -rf $TOPLEVEL/$tmpdir" 0
+
+git diff --cached --name-only --diff-filter=ACMR |
+    xargs git checkout-index --prefix=$tmpdir/ --
+
+cd $tmpdir
+
+echo "=== yaml checks ==="
+
+(
+find . -name '*.yaml' -print0
+[ -d fragments ] &&
+	find fragments -type f | xargs grep -l '^#cloud-config'
+) | xargs -0 python ${TOPLEVEL}/tools/validate-yaml.py -v || exit 1
+

tools/validate-all-yaml.sh

@@ -0,0 +1,9 @@
+#!/bin/sh
+
+TOPLEVEL=$(git rev-parse --show-toplevel)
+cd $TOPLEVEL
+
+git ls-files |
+	grep '\.yaml' |
+	xargs python ${TOPLEVEL}/tools/validate-yaml.py -v || exit 1
+

tools/validate-yaml.py

@@ -0,0 +1,38 @@
+#!/usr/bin/python
+
+import sys
+import argparse
+import yaml
+import logging
+
+
+def parse_args():
+    p = argparse.ArgumentParser()
+    p.add_argument('--verbose', '-v',
+                   action='store_const',
+                   const='INFO',
+                   dest='loglevel')
+    p.add_argument('input', nargs='*')
+    p.set_defaults(loglevel='WARN')
+    return p.parse_args()
+
+
+def main():
+    args = parse_args()
+    logging.basicConfig(level=args.loglevel)
+    res = 0
+
+    for filename in args.input:
+        with open(filename) as fd:
+            try:
+                yaml.load(fd)
+                logging.info('%s: passed', filename)
+            except yaml.error.YAMLError as error:
+                res = 1
+                logging.error('%s: failed: %s',
+                              filename, error)
+
+    return res
+
+if __name__ == '__main__':
+    sys.exit(main())