feat: Add update command to coder-cli (#417)

* feat: Add update command to coder-cli

This commit adds a new update subcommand that queries a Coder instance
for its current version, fetches the corresponding version from
GitHub releases if required, and updates the binary in-place.

Author: johnstcn

docs/coder.md

@@ -20,6 +20,7 @@ coder provides a CLI for working with an existing Coder installation
 * [coder ssh](coder_ssh.md)	 - Enter a shell of execute a command over SSH into a Coder workspace
 * [coder sync](coder_sync.md)	 - Establish a one way directory sync to a Coder workspace
 * [coder tokens](coder_tokens.md)	 - manage Coder API tokens for the active user
+* [coder update](coder_update.md)	 - Update coder binary
 * [coder urls](coder_urls.md)	 - Interact with workspace DevURLs
 * [coder users](coder_users.md)	 - Interact with Coder user accounts
 * [coder workspaces](coder_workspaces.md)	 - Interact with Coder workspaces

docs/coder_update.md

@@ -0,0 +1,31 @@
+## coder update
+
+Update coder binary
+
+### Synopsis
+
+Update coder to the version matching a given coder instance.
+
+```
+coder update [flags]
+```
+
+### Options
+
+```
+      --coder string     query this coder instance for the matching version
+      --force            do not prompt for confirmation
+  -h, --help             help for update
+      --version string   explicitly specify which version to fetch and install
+```
+
+### Options inherited from parent commands
+
+```
+  -v, --verbose   show verbose output
+```
+
+### SEE ALSO
+
+* [coder](coder.md)	 - coder provides a CLI for working with an existing Coder installation
+

go.mod

@@ -5,6 +5,7 @@ go 1.14
 require (
 	cdr.dev/slog v1.4.1
 	cdr.dev/wsep v0.0.0-20200728013649-82316a09813f
+	github.com/Masterminds/semver/v3 v3.1.1
 	github.com/briandowns/spinner v1.16.0
 	github.com/cli/safeexec v1.0.0
 	github.com/fatih/color v1.12.0
@@ -23,6 +24,7 @@ require (
 	github.com/pion/webrtc/v3 v3.0.32
 	github.com/pkg/browser v0.0.0-20180916011732-0a3d74bf9ce4
 	github.com/rjeczalik/notify v0.9.2
+	github.com/spf13/afero v1.6.0
 	github.com/spf13/cobra v1.2.1
 	github.com/stretchr/testify v1.7.0
 	golang.org/x/crypto v0.0.0-20210711020723-a769d52b0f97

go.sum

@@ -49,6 +49,8 @@ github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03
 github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
 github.com/GeertJohan/go.incremental v1.0.0/go.mod h1:6fAjUhbVuX1KcMD3c8TEgVUqmo4seqhv0i0kdATSkM0=
 github.com/GeertJohan/go.rice v1.0.0/go.mod h1:eH6gbSOAUv07dQuZVnBmoDP8mgsM1rtixis4Tib9if0=
+github.com/Masterminds/semver/v3 v3.1.1 h1:hLg3sBzpNErnxhQtUy/mmLR2I9foDujNK030IGemrRc=
+github.com/Masterminds/semver/v3 v3.1.1/go.mod h1:VPu/7SZ7ePZ3QOrcuXROw5FAcLl4a0cBrbBpGY/8hQs=
 github.com/akavel/rsrc v0.8.0/go.mod h1:uLoCtb9J+EyAqh+26kdrTgmzRBFPGOolLWKpdxkKq+c=
 github.com/alecthomas/assert v0.0.0-20170929043011-405dbfeb8e38 h1:smF2tmSOzy2Mm+0dGI2AIUHY+w0BUc+4tn40djz7+6U=
 github.com/alecthomas/assert v0.0.0-20170929043011-405dbfeb8e38/go.mod h1:r7bzyVFMNntcxPZXK3/+KdruV1H5KSlyVY0gc+NgInI=
@@ -378,6 +380,7 @@ github.com/shurcooL/sanitized_anchor_name v1.0.0 h1:PdmoCO6wvbs+7yrJyMORt4/BmY5I
 github.com/shurcooL/sanitized_anchor_name v1.0.0/go.mod h1:1NzhyTcUVG4SuEtjjoZeVRXNmyL/1OwPU0+IJeTBvfc=
 github.com/smartystreets/assertions v0.0.0-20180927180507-b2de0cb4f26d/go.mod h1:OnSkiWE9lh6wB0YB77sQom3nweQdgAjqCqsofrRNTgc=
 github.com/smartystreets/goconvey v1.6.4/go.mod h1:syvi0/a8iFYH4r/RixwvyeAJjdLS9QV7WQ/tjFTllLA=
+github.com/spf13/afero v1.6.0 h1:xoax2sJ2DT8S8xA2paPFjDCScCNeWsg75VG0DLRreiY=
 github.com/spf13/afero v1.6.0/go.mod h1:Ai8FlHk4v/PARR026UzYexafAt9roJ7LcLMAmO6Z93I=
 github.com/spf13/cast v1.3.1/go.mod h1:Qx5cxh0v+4UWYiBimWS+eyWzqEqokIECu5etghLkUJE=
 github.com/spf13/cobra v1.2.1 h1:+KmjbUw1hriSNMF55oPrkZcb27aECyrj8V2ytv7kWDw=

internal/cmd/cmd.go

@@ -38,6 +38,7 @@ func Make() *cobra.Command {
 		tagsCmd(),
 		tokensCmd(),
 		tunnelCmd(),
+		updateCmd(),
 		urlCmd(),
 		usersCmd(),
 		workspacesCmd(),