Makefile: add "install" target

Makefile

@@ -6,6 +6,7 @@ PLUGIN_DIRECTORY ?= plugins
 PLUGIN_FILES = $(patsubst %,$(PLUGIN_DIRECTORY)/%,$(PLUGINS))
 VERSION ?= $(shell cat VERSION)
 DIST_DIR = releases
+DESTDIR ?= /usr/local/bin
 TGZ_FILE ?= $(DIST_DIR)/muninlite-$(VERSION).tar.gz
 
 
@@ -32,6 +33,7 @@ help:
 	@$(info   all         - assemble 'TARGET_FILE' ($(TARGET_FILE)))
 	@$(info   clean       - remove assembled 'TARGET_FILE' ($(TARGET_FILE)))
 	@$(info   clean-all   - remove old releases from 'DIST_DIR' ($(DIST_DIR)))
+	@$(info   install     - install the standalone shell script)
 	@$(info   help        - show this overview)
 	@$(info   lint        - code style checks)
 	@$(info   spelling    - check spelling)
@@ -66,6 +68,12 @@ $(TGZ_FILE):
 	git archive --prefix=muninlite-$(VERSION)/ --format=tar --output "$@.tmp" HEAD
 	mv "$@.tmp" "$@"
 
+.PHONY: install
+install: $(TARGET_FILE)
+	mkdir -p "$(dir $(DESTDIR))"
+	cp "$(TARGET_FILE)" "$(DESTDIR)/"
+
+
 .PHONY: lint
 lint:
 	shellcheck -s dash --exclude=SC2230 $(PLUGIN_FILES) "$(INPUT_FILE)"

README.md

@@ -55,11 +55,10 @@ You may assemble a reduced script by including only specific plugins:
 $ make PLUGINS="cpu load uptime"
 ```
 
-Copy munin-node to a suitable location (/usr/local/bin/) and make it
-executable (there will be a "make install" at a later release)
+Run `make install` or simply copy `munin-node` to a suitable location.
 
 ```shell
-cp munin-node /usr/local/bin
+make install
 ```
 
 Two typical ways of using MuninLite as a `munin-node` replacement are: