Add a make install command

Changelog: added

Makefile

-.PHONY: validate verify verify_ruby verify_golang test test_ruby test_golang coverage coverage_golang setup _install build compile check clean
+.PHONY: validate verify verify_ruby verify_golang test test_ruby test_golang coverage coverage_golang setup _script_install build compile check clean install
 
 GO_SOURCES := $(shell find . -name '*.go')
 VERSION_STRING := $(shell git describe --match v* 2>/dev/null || awk '$0="v"$0' VERSION 2>/dev/null || echo unknown)
@@ -6,6 +6,8 @@ BUILD_TIME := $(shell date -u +%Y%m%d.%H%M%S)
 BUILD_TAGS := tracer_static tracer_static_jaeger continuous_profiler_stackdriver
 GOBUILD_FLAGS := -ldflags "-X main.Version=$(VERSION_STRING) -X main.BuildTime=$(BUILD_TIME)" -tags "$(BUILD_TAGS)"
 
+PREFIX ?= /usr/local
+
 validate: verify test
 
 verify: verify_golang
@@ -30,9 +32,9 @@ coverage: coverage_golang
 coverage_golang:
 	[ -f cover.out ] && go tool cover -func cover.out
 
-setup: _install bin/gitlab-shell
+setup: _script_install bin/gitlab-shell
 
-_install:
+_script_install:
 	bin/install
 
 build: bin/gitlab-shell
@@ -45,3 +47,12 @@ check:
 
 clean:
 	rm -f bin/check bin/gitlab-shell bin/gitlab-shell-authorized-keys-check bin/gitlab-shell-authorized-principals-check bin/gitlab-sshd
+
+install: compile
+	mkdir -p $(DESTDIR)$(PREFIX)/bin/
+	install -m755 bin/check $(DESTDIR)$(PREFIX)/bin/check
+	install -m755 bin/gitlab-shell $(DESTDIR)$(PREFIX)/bin/gitlab-shell
+	install -m755 bin/gitlab-shell $(DESTDIR)$(PREFIX)/bin/gitlab-shell-authorized-keys-check
+	install -m755 bin/gitlab-shell $(DESTDIR)$(PREFIX)/bin/gitlab-shell-authorized-principals-check
+	install -m755 bin/gitlab-shell $(DESTDIR)$(PREFIX)/bin/gitlab-sshd
+

README.md

@@ -34,16 +34,36 @@ Download and install the current version of Go from https://golang.org/dl/
 We follow the [Golang Release Policy](https://golang.org/doc/devel/release.html#policy)
 of supporting the current stable version and the previous two major versions.
 
-## Setup
-
-    make setup
-
 ## Check
 
 Checks if GitLab API access and redis via internal API can be reached:
 
     make check
 
+## Compile
+
+Builds the `gitlab-shell` binaries, placing them into `bin/`.
+
+    make compile
+
+## Install
+
+Builds the `gitlab-shell` binaries and installs them onto the filesystem. The
+default location is `/usr/local`, but can be controlled by use of the `PREFIX`
+and `DESTDIR` environment variables.
+
+    make install
+
+## Setup
+
+This command is intended for use when installing GitLab from source on a single
+machine. In addition to compiling the gitlab-shell binaries, it ensures that
+various paths on the filesystem exist with the correct permissions. Do not run
+it unless instructed to by your installation method documentation.
+
+    make setup
+
+
 ## Testing
 
 Run tests: