Add a script to run checkbashisms on codebase

Requires the devscripts
https://github.com/Debian/devscripts
and git installed

Closes-bug: #1511721

Change-Id: I0da88d1dfcf82f57806d1753995719d785d8080a
Signed-off-by: Bogdan Dobrelya <bdobrelia@mirantis.com>

Makefile

@@ -26,3 +26,6 @@ install:
 	for file in ocf/*; do \
 		$(INSTALL) -t $(DESTDIR)/usr/lib/ocf/resource.d/openstack -m 0755 $${file} ; \
 	done
+
+syntax-check:
+	utils/syntax_check.sh -a -p

utils/syntax_check.sh

@@ -0,0 +1,107 @@
+#!/bin/bash
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+usage="$(basename "$0") [-h] [-m MODULE] [-a] [-p] -- runs syntax check with
+the checkbashisms tool. By default checks only changed and unstaged files.
+
+where:
+    -h|--help             show this help text
+    -a|--all              check all files in the CHECK_PATH (default ./ocf) dir
+    -p|--POSIX            run POSIX:2001 checks against bash shebangs as well
+"
+
+CHECK_PATH="${CHECK_PATH:-./ocf}"
+POSIX_CHECKS=1
+ALL=1
+while [ $# -gt 0 ] ; do
+    key="$1"
+
+    case $key in
+        -h|--help)
+            echo "$usage" >&2
+            exit 0
+        ;;
+        -a|--all)
+            ALL=0
+        ;;
+        -p|--POSIX)
+            POSIX_CHECKS=0
+        ;;
+        *)
+        ;;
+    esac
+    shift
+done
+
+TMPFILE=$(mktemp /tmp/tmp.XXXXXXXXXX)
+# Register exit trap for removing temporary files
+trap 'rm -rf $TMPFILE' EXIT INT HUP
+
+# Function for check shell scripts
+check_bash() {
+    local rc
+    bash -n "$1"
+    rc=$?
+    [ $rc -ne 0 ] && return $rc
+
+    if [ $POSIX_CHECKS -eq 0 ]; then
+        cat "$1" > "${TMPFILE}"
+        sed -i -e 's%^#!/bin/bash%#!/bin/sh%g' "${TMPFILE}" >/dev/null 2>&1
+        /usr/bin/checkbashisms "${TMPFILE}"
+        rc=$?
+    else
+        /usr/bin/checkbashisms "$1"
+        rc=$?
+    fi
+    [ $rc -eq 4 ] && rc=0
+    return $rc
+}
+
+# Function that checks syntax
+check_syntax() {
+    local rc
+    local exit_code
+    local all_files
+    local failed_files
+    local x
+    exit_code=0
+    if [ $ALL -eq 0 ]; then
+        all_files="$(find ${CHECK_PATH} -type f -o -type f -path ${CHECK_PATH})"
+    else
+        # Get a list of files changed in this transaction
+        all_files="$(git diff --name-only HEAD)"
+    fi
+    for x in $all_files; do
+        case $(file --mime --brief $x) in
+            *x-shellscript*)
+                check_bash "${x}"
+                rc=$?
+                if [ $rc -ne 0 ] ; then
+                    exit_code=1
+                    failed_files=$(printf "%b\n" "${failed_files}" "${x}")
+                fi
+            ;;
+        esac
+    done
+    echo "${failed_files}"
+    return $exit_code
+}
+
+if results=$(check_syntax); then
+    echo "Syntax Test SUCCEEDED: no syntax errors found"
+    exit 0
+else
+    echo "Syntax Test FAILED: syntax errors found in the following files:"
+    printf "%b\n" "${results}"
+    exit 1
+fi