Create base

.gitignore

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+vendor

.sail/Dockerfile

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+FROM codercom/ubuntu-dev-go
+
+LABEL project_root "~/go/src/go.coder.com"

README.md

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+# sshcode
+
+`sshcode` is a CLI to automatically install and run [code-server](https://github.com/codercom/code-server) over SSH.
+
+![Demo](/demo.gif)
+
+## Install
+
+Chrome is recommended.
+
+```bash
+go get go.coder.com/sshcode
+```
+
+## Usage
+
+```bash
+sshcode [email protected]
+# Starts code-server on dev.kwc.io and opens in a new browser window.
+```

go.mod

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+module go.coder.com/sshcode
+
+go 1.12
+
+require (
+	go.coder.com/flog v0.0.0-20190129195112-eaed154a0db8
+	golang.org/x/sys v0.0.0-20190418153312-f0ce4c0180be // indirect
+)

go.sum

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+github.com/fatih/color v1.7.0 h1:DkWD4oS2D8LGGgTQ6IvwJJXSL5Vp2ffcQg58nFV38Ys=
+github.com/fatih/color v1.7.0/go.mod h1:Zm6kSWBoL9eyXnKyktHP6abPY2pDugNf5KwzbycvMj4=
+github.com/mattn/go-colorable v0.0.9 h1:UVL0vNpWh04HeJXV0KLcaT7r06gOH2l4OW6ddYRUIY4=
+github.com/mattn/go-colorable v0.0.9/go.mod h1:9vuHe8Xs5qXnSaW/c/ABM9alt+Vo+STaOChaDxuIBZU=
+github.com/mattn/go-isatty v0.0.4 h1:bnP0vzxcAdeI1zdubAl5PjU6zsERjGZb7raWodagDYs=
+github.com/mattn/go-isatty v0.0.4/go.mod h1:M+lRXTBqGeGNdLjl/ufCoiOlB5xdOkqRJdNxMWT7Zi4=
+go.coder.com/flog v0.0.0-20190129195112-eaed154a0db8 h1:PtQ3moPi4EAz3cyQhkUs1IGIXa2QgJpP60yMjOdu0kk=
+go.coder.com/flog v0.0.0-20190129195112-eaed154a0db8/go.mod h1:83JsYgXYv0EOaXjIMnaZ1Fl6ddNB3fJnDZ/8845mUJ8=
+golang.org/x/sys v0.0.0-20190418153312-f0ce4c0180be h1:mI+jhqkn68ybP0ORJqunXn+fq+Eeb4hHKqLQcFICjAc=
+golang.org/x/sys v0.0.0-20190418153312-f0ce4c0180be/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=

main.go

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+package main
+
+import (
+	"context"
+	"errors"
+	"flag"
+	"fmt"
+	"net"
+	"net/http"
+	"os"
+	"os/exec"
+	"strconv"
+	"time"
+
+	"go.coder.com/flog"
+)
+
+func main() {
+	flag.Usage = func() {
+		fmt.Printf(`Usage: %v HOST [SSH ARGS...]
+
+Start code-server over SSH.
+More info: https://github.com/codercom/sshcode
+`, os.Args[0])
+	}
+
+	flag.Parse()
+	host := flag.Arg(0)
+
+	if host == "" {
+		// If no host is specified output the usage.
+		flag.Usage()
+		os.Exit(1)
+	}
+
+	flog.Info("ensuring code-server is updated...")
+
+	// Downloads the latest code-server and allows it to be executed.
+	sshCmd := exec.Command("ssh",
+		"-tt",
+		host,
+		`/bin/bash -c 'set -euxo pipefail || exit 1
+mkdir -p ~/bin
+wget -q https://codesrv-ci.cdr.sh/latest-linux -O ~/bin/code-server
+chmod +x ~/bin/code-server
+'`,
+	)
+	output, err := sshCmd.CombinedOutput()
+	if err != nil {
+		flog.Fatal("failed to update code-server: %v: %s", err, string(output))
+	}
+
+	flog.Info("starting code-server...")
+	localPort, err := scanAvailablePort()
+	if err != nil {
+		flog.Fatal("failed to scan available port: %v", err)
+	}
+
+	// Starts code-server and forwards the remote port.
+	sshCmd = exec.Command("ssh",
+		"-tt",
+		"-q",
+		"-L",
+		localPort+":localhost:"+localPort,
+		host,
+		"~/bin/code-server --host 127.0.0.1 --allow-http --no-auth --port="+localPort,
+	)
+	sshCmd.Stdout = os.Stdout
+	sshCmd.Stderr = os.Stderr
+	err = sshCmd.Start()
+	if err != nil {
+		flog.Fatal("failed to start code-server: %v", err)
+	}
+
+	var openCmd *exec.Cmd
+	url := "http://127.0.0.1:" + localPort
+	if commandExists("google-chrome") {
+		openCmd = exec.Command("google-chrome", "--app="+url, "--disable-extensions", "--disable-plugins")
+	} else if commandExists("firefox") {
+		openCmd = exec.Command("firefox", "--url="+url, "-safe-mode")
+	}
+
+	ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
+	defer cancel()
+	for {
+		err := ctx.Err()
+		if err != nil {
+			flog.Fatal("code-server didn't start in time %v", err)
+		}
+		// Waits for code-server to be available before opening the browser.
+		r, _ := http.NewRequest("GET", url, nil)
+		r = r.WithContext(ctx)
+		resp, err := http.DefaultClient.Do(r)
+		if err != nil {
+			continue
+		}
+		resp.Body.Close()
+		break
+	}
+
+	err = openCmd.Start()
+	if err != nil {
+		flog.Fatal("failed to open browser: %v", err)
+	}
+	sshCmd.Wait()
+}
+
+// Checks if a command exists locally.
+func commandExists(name string) bool {
+	_, err := exec.LookPath(name)
+	return err == nil
+}
+
+// scanAvailablePort scans 1024-4096 until an available port is found.
+func scanAvailablePort() (string, error) {
+	for port := 1024; port < 4096; port++ {
+		l, err := net.Listen("tcp", fmt.Sprintf(":%d", port))
+		if err != nil {
+			// If we have an error the port is taken.
+			port++
+			continue
+		}
+		_ = l.Close()
+
+		return strconv.Itoa(port), nil
+	}
+
+	return "", errors.New("no ports available")
+}