refactor: use constants for OSs (#448)

Author: greyscaled

internal/cmd/configssh.go

@@ -160,7 +160,7 @@ func binPath() (string, error) {
 	// Bash and OpenSSH for Windows (used by Powershell and VS Code) to function
 	// correctly. Check if the current executable is in $PATH, and warn the user
 	// if it isn't.
-	if runtime.GOOS == "windows" {
+	if runtime.GOOS == goosWindows {
 		binName := filepath.Base(exePath)
 
 		// We use safeexec instead of os/exec because os/exec returns paths in
@@ -268,7 +268,7 @@ func makeSSHConfig(binPath, workspaceName, privateKeyFilepath string, additional
 		fmt.Sprintf("IdentityFile=%q", privateKeyFilepath),
 	)
 
-	if runtime.GOOS == "linux" || runtime.GOOS == "darwin" {
+	if runtime.GOOS == goosLinux || runtime.GOOS == goosDarwin {
 		options = append(options,
 			"ControlMaster auto",
 			"ControlPath ~/.ssh/.connection-%r@%h:%p",

internal/cmd/update.go

@@ -36,6 +36,7 @@ import (
 const (
 	goosWindows       = "windows"
 	goosLinux         = "linux"
+	goosDarwin        = "darwin"
 	apiPrivateVersion = "/api/private/version"
 )
 
@@ -181,7 +182,7 @@ func (u *updater) Run(ctx context.Context, force bool, coderURLArg string, versi
 	// TODO: validate the checksum of the downloaded file. GitHub does not currently provide this information
 	// and we do not generate them yet.
 	var updatedBinaryName string
-	if u.osF() == "windows" {
+	if u.osF() == goosWindows {
 		updatedBinaryName = "coder.exe"
 	} else {
 		updatedBinaryName = "coder"