support Go 1.11, disallow older versions. (micromdm#499)

Updates for Go versions with module support, deprecating the need for GOPATH, and removing dep as a tool for managing dependencies.

Author: groob

.circleci/config.yml

@@ -1,8 +1,8 @@
 version: 2
 jobs:
-  build-go1.10:
+  build-go1.11:
     docker:
-        - image: golang:1.10
+        - image: golang:1.11
     working_directory: /go/src/github.com/micromdm/micromdm
     steps: &steps
       - checkout
@@ -14,4 +14,4 @@ workflows:
   version: 2
   build:
     jobs:
-      - build-go1.10
+      - build-go1.11

CONTRIBUTING.md

@@ -15,33 +15,23 @@ Here's a few places to get started and find out what's outstanding.
 
 ## Building the project
 
-To build MicroMDM from source, you will need [Go 1.10](https://golang.org/dl/) or later installed.
+To build MicroMDM from source, you will need [Go 1.11](https://golang.org/dl/) or later installed.
 
 ```
-# if GOPATH is unset:
-# export GOPATH=${HOME}/go
-
-# clone repo into GOPATH:
-git clone git@github.com:micromdm/micromdm $GOPATH/src/github.com/micromdm/micromdm
-cd $GOPATH/src/github.com/micromdm/micromdm
-
-# download dependencies and build:
+git clone git@github.com:micromdm/micromdm && cd micromdm
 make deps
 make
 
 # run
 ./build/darwin/micromdm -h
+./build/darwin/mdmctl -h
 ```
 
 ## Git workflow
-Go requires that your repo lives in `$GOPATH/src/github.com/micromdm/micromdm` even if you're trying to push to your github fork. To work with a forked copy, use a git remote.
-Example:
 ```
-# clone repo into GOPATH:
-git clone git@github.com:micromdm/micromdm $GOPATH/src/github.com/micromdm/micromdm
-
+username=groob
 # add your remote/upstream
-git remote add groob git@github.com:groob/micromdm.git
+git remote add $username git@github.com:groob/micromdm.git
 
 # update from origin/master
 git pull --rebase
@@ -51,36 +41,18 @@ git checkout -b my_feature
 
 # push changes from my_feature to your fork.
 #    -u, --set-upstream    set upstream for git pull/status
-git push -u groob
+git push -u $username
 ```
 
 
-## If you're new to Go
-
-Go is a bit different from other languages in its requirements for how it expects its programmers to organize Go code files in directories.
-First, Go requires a folder, called a workspace (you can name it anything you'd like) to exist for go source, dependencies, etc. Before Go 1.8 the path to this folder must always be set in the environment variable `GOPATH` (example: `export GOPATH=/Users/groob/code/go`). As of Go 1.8 the default `GOPATH` is set to `$HOME/go` but you can still set it to whatever you like.
-Your `GOPATH` must have thee subfolders: `bin`, `pkg`, and `src`. Any code you create must live inside the `src` folder. It's also helpful to add `$GOPATH/bin` to your environment's `PATH` as that is where `go install` will place go binaries that you build. This makes it so that binaries that are insalled can just be invoked by name rather than their full page.
+## Go Resources
 
 A few helpful resources for getting started with Go:
 
 * [Writing, building, installing, and testing Go code](https://www.youtube.com/watch?v=XCsL89YtqCs)
 * [Resources for new Go programmers](http://dave.cheney.net/resources-for-new-go-programmers)
 * [How I start](https://howistart.org/posts/go/1)
 * [How to write Go code](https://golang.org/doc/code.html)
-* [GOPATH on the go wiki](https://github.com/golang/go/wiki/GOPATH)
-
-To build MicroMDM you will need to:
-
-1. Download and install [`Go`](https://golang.org/dl/)
-2. Make a workspace directory and set the `GOPATH` as explained above.
-3. Install [`dep`](https://github.com/golang/dep) via the command `go get -u github.com/golang/dep/...`
-Note that `dep` is a very new project itself. If you're running trouble with the `dep ensure` command, ping @groob in the #micromdm channel on Slack.
-4. `mkdir -p $GOPATH/src/github.com/micromdm`
-5. `git clone git@github.com:micromdm/micromdm.git` the project into the above folder.
-The repo must always be in the folder `$GOPATH/src/github.com/micromdm/micromdm` even if you forked the project. Add a git remote to your fork to track upstream.
-6. `dep ensure` The `dep` command will download and install all necessary dependencies for the project to compile.
-7. `go build` or `go install`
-8. File an issue or a pull request if the instructions are unclear or problems pop-up for you.
 
 ## Important libraries and frameworks