Installing Golang on Ubuntu

We will be using snappy tool to install go on ubuntu.

Ref: snappy

• Get info for go packages availabe. ``` $ snap info go

  name: go summary: Go programming language compiler, linker, stdlib publisher: Michael Hudson-Doyle (mwhudson) contact: michael.hudson@ubuntu.com license: unset description: | This snap provides an assembler, compiler, linker, and compiled libraries for the Go programming language. commands:

  • go
  • go.gofmt snap-id: Md1HBASHzP4i0bniScAjXGnOII9cEK6e tracking: stable refresh-date: 2 days ago, at 07:00 IST channels: stable: 1.12.6 2019-06-13 (3947) 92MB classic candidate: ^
    beta: ^
    edge: devel-7a4d023 2019-06-17 (3978) 92MB classic 1.12/stable: 1.12.6 2019-06-13 (3947) 92MB classic 1.12/candidate: ^
    1.12/beta: ^
    1.12/edge: ^
    1.11/stable: 1.11.11 2019-06-13 (3945) 82MB classic 1.11/candidate: 1.11.11 2019-06-12 (3945) 82MB classic 1.11/beta: ^
    1.11/edge: ^
    1.10/stable: 1.10.8 2019-01-24 (3133) 58MB classic 1.10/candidate: ^
    1.10/beta: ^
    1.10/edge: ^
    ```

• Install go

  $ sudo snap install --classic --channel=1.11/stable go
      
  -- Option "--classic" disables security confinement; to let go have access to system resources.
  -- Otherwise(without option --classic) 
      snaps are installed and mounted in a tightly controlled space: they don’t have access to the vast majority of system resources, 
      they bundle libraries they need and have a read-only file-system. 
      In the snap world, this is the “strict” confinement policy, which is enforced by default.
  -- Option "--channel"
    allow you to specify a channel from which the package is downloaded and installed.
  

• vefiry go installation

  $ go version
  go version go1.12.6 linux/amd64
  

• GOROOT vs GOPATH env variables.

  -- GOROOT must be set only when installing to a custom location.
  -- The GOPATH environment variable lists places to look for Go code. 
  On Unix, the value is a colon-separated string. On Windows, the value is a semicolon-separated string. 
  On Plan 9, the value is a list. GOPATH must be set to get, build and install packages outside the standard Go tree.
  

GOOS & GOARCH build arguments

Go provides easy to build executable binary for any platform.

For e.g: To build binary for windows

-- builds main.exe
$ env GOOS=windows GOARCH=amd64 go build main.go 
$ ls
main.exe main.go

Go CLI

• Project initializatoin
• Build go project
• go gen to generate go code
• go get to retrieve dependencies
• go test
• profiling (like cheking cpu, network usage, memory)
• go doc for documentaion