makefile: decompose deps installation

Since it will be more convenient to see CI jobs making its own work, the
installation of rocks was rewriten to install rocks only for one task.

Author: themilchenko

Makefile

@@ -51,9 +51,24 @@ coveralls: $(LUACOV_STATS)
 	echo "Send code coverage data to the coveralls.io service"
 	luacov-coveralls --include ^roles --verbose --repo-token ${GITHUB_TOKEN}
 
-deps:
+deps-test:
 	tt rocks install luatest 1.0.1
-	tt rocks install luacheck 0.26.0
+
+deps-coverage: deps-test
 	tt rocks install luacov 0.13.0-1
 	tt rocks install luacov-coveralls 0.2.3-1 --server=http://luarocks.org
+
+deps-lint:
+	tt rocks install luacheck 0.26.0
+
+deps:
+ifeq ($(depname), test)
+	$(MAKE) deps-test
+else ifeq ($(depname), coverage)
+	$(MAKE) deps-coverage
+else ifeq ($(depname), lint)
+	$(MAKE) deps-lint
+else
+	$(MAKE) deps-coverage deps-lint
+endif
 	tt rocks make

README.md

@@ -206,12 +206,32 @@ git clone https://github.com/tarantool/metrics-export-role
 cd metrics-export-role
 ```
 
-After that you need to install dependencies (`tt` is required):
+After that you need to install dependencies (`tt` is required).
+To do it, run:
 
 ```shell
 make deps
 ```
 
+It's possible to install requirements only for running tests
+or linter check. To install only tests requirements, run:
+
+```shell
+make deps depname=test
+```
+
+To install tests with coverage requirements, run:
+
+```shell
+make deps depname=coverage
+```
+
+To install linter checks, run:
+
+```shell
+make deps depname=lint
+```
+
 At this point you could run tests (`tarantool` 3 is required):
 
 ```shell