Makefile: Add helper script for CI or devs

This file will be used by CI (github) to factorize opperations that
can be also run on developer workstation.

Origin: https://github.com/xcp-ng/xcp/pull/803
Signed-off-by: Philippe Coval <[email protected]>

Makefile

@@ -0,0 +1,33 @@
+#!/usr/bin/make -f
+# -*- makefile -*-
+# ex: set tabstop=4 noexpandtab:
+# -*- coding: utf-8 -*
+
+default: help
+
+jq?=jq --indent 4
+
+help: README.md
+	@echo "Please read $^"
+	@echo ""
+	@head $^
+	@echo ""
+	@echo "More details in $^"
+
+setup:
+	@echo "info: $@: Checking presence of tools if not please install them"
+	${jq} --version
+
+lint: setup
+	@echo "info: $@: json files"
+	find . \
+		-iname "*_cache" -type d -prune -false \
+		-o -iname "*.json" -type f \
+		-print \
+	| while read file ; do \
+		${jq} . "$${file}" > "$${file}.tmp" && mv "$${file}.tmp" "$${file}" ; \
+	done
+
+check: lint
+	@echo "info: $@: will pass if sources are linted, if not please lint and commit"
+	git diff --stat --exit-code