Add Homebrew formula

README.md

@@ -5,14 +5,18 @@ from a [Terraform] [tf] state file. It allows one to spawn a bunch of VMs with
 Terraform, then (re-)provision them with Ansible. It's pretty neat.
 
 
+# Installation
+
+On OSX, install it with Homebrew:
+
+	brew install https://raw.github.com/adammck/terraform-inventory/master/homebrew/terraform-inventory.rb
+
+This is only a tiny tool, so it's not in the main Homebrew repo. Feel free to
+add it, if you think that would be useful.
+
+
 ## Usage
 
-Just download the OSX binary and run it.
-
-	curl -L -O https://github.com/adammck/terraform-inventory/releases/download/v0.2/terraform-inventory
-	chmod u+x terraform-inventory
-	./terraform-inventory --list whatever.tfstate
-
 Ansible doesn't (seem to) support calling the inventory script with parameters
 (and this tool doesn't support configuration via environment variables yet), so
 I like to create a little shell script and call that. Something like:
@@ -27,10 +31,10 @@ Then run Ansible with the script as an inventory:
 
 ## Development
 
-[Install Terraform] [tfdev] from source, then:
+It's just a Go app, so the usual:
 
-	git clone https://github.com/adammck/terraform-inventory.git
+	go get github.com/adammck/terraform-inventory
-	cd terraform-inventory
+	cd $GOPATH/adammck/terraform-inventory
 	go build
 
 
@@ -43,4 +47,3 @@ MIT.
 
 [ansible]: http://www.ansible.com
 [tf]:      http://www.terraform.io
-[tfdev]:   https://github.com/hashicorp/terraform#developing-terraform

homebrew/terraform-inventory.rb

@@ -0,0 +1,32 @@
+class TerraformInventory < Formula
+  homepage "https://github.com/adammck/terraform-inventory"
+  head "https://github.com/adammck/terraform-inventory.git"
+
+  # Update these when a new version is released
+  url "https://github.com/adammck/terraform-inventory/archive/0.3.tar.gz"
+  sha1 "fc4d492e328255b422429e221ff7d31533da96f9"
+
+  depends_on "go" => :build
+
+  def install
+    ENV["GOPATH"] = buildpath
+
+    # Move the contents of the repo (which are currently in the buildpath) into
+    # a go-style subdir, so we can build it without spewing deps everywhere.
+    app_path = buildpath/"src/github.com/adammck/terraform-inventory"
+    app_path.install Dir["*"]
+
+    # Fetch the deps (into our temporary gopath) and build
+    cd "src/github.com/adammck/terraform-inventory" do
+      system "go", "get"
+      system "go", "build", "-ldflags", "-X main.build_version '#{version}'"
+    end
+
+    # Install the resulting binary
+    bin.install "bin/terraform-inventory"
+  end
+
+  test do
+    system "#{bin}/terraform-inventory", "version"
+  end
+end