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packer: remove Command

This commit is contained in:
Mitchell Hashimoto 2014-10-27 20:37:11 -07:00
parent fa36cf82ee
commit 3e1f4ae1d2
4 changed files with 0 additions and 342 deletions
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23
packer/command.go
View File

@ -1,23 +0,0 @@
package packer
// A command is a runnable sub-command of the `packer` application.
// When `packer` is called with the proper subcommand, this will be
// called.
//
// The mapping of command names to command interfaces is in the
// Environment struct.
type Command interface {
// Help should return long-form help text that includes the command-line
// usage, a brief few sentences explaining the function of the command,
// and the complete list of flags the command accepts.
Help() string
// Run should run the actual command with the given environmet and
// command-line arguments. It should return the exit status when it is
// finished.
Run(env Environment, args []string) int
// Synopsis should return a one-line, short synopsis of the command.
// This should be less than 50 characters ideally.
Synopsis() string
}

22
packer/command_test.go
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@ -1,22 +0,0 @@
package packer
type TestCommand struct {
runArgs []string
runCalled bool
runEnv Environment
}
func (tc *TestCommand) Help() string {
return "bar"
}
func (tc *TestCommand) Run(env Environment, args []string) int {
tc.runCalled = true
tc.runArgs = args
tc.runEnv = env
return 0
}
func (tc *TestCommand) Synopsis() string {
return "foo"
}

176
packer/environment.go
View File

@ -4,19 +4,12 @@ package packer
import (
"errors"
"fmt"
"log"
"os"
"sort"
"strings"
"sync"
)
// The function type used to lookup Builder implementations.
type BuilderFunc func(name string) (Builder, error)
// The function type used to lookup Command implementations.
type CommandFunc func(name string) (Command, error)
// The function type used to lookup Hook implementations.
type HookFunc func(name string) (Hook, error)
@ -31,7 +24,6 @@ type ProvisionerFunc func(name string) (Provisioner, error)
// commands, etc.
type ComponentFinder struct {
Builder BuilderFunc
Command CommandFunc
Hook HookFunc
PostProcessor PostProcessorFunc
Provisioner ProvisionerFunc
@ -45,7 +37,6 @@ type ComponentFinder struct {
type Environment interface {
Builder(string) (Builder, error)
Cache() Cache
Cli([]string) (int, error)
Hook(string) (Hook, error)
PostProcessor(string) (PostProcessor, error)
Provisioner(string) (Provisioner, error)
@ -56,7 +47,6 @@ type Environment interface {
// environment.
type coreEnvironment struct {
cache Cache
commands []string
components ComponentFinder
ui Ui
}
@ -64,22 +54,14 @@ type coreEnvironment struct {
// This struct configures new environments.
type EnvironmentConfig struct {
Cache Cache
Commands []string
Components ComponentFinder
Ui Ui
}
type helpCommandEntry struct {
i int
key string
synopsis string
}
// DefaultEnvironmentConfig returns a default EnvironmentConfig that can
// be used to create a new enviroment with NewEnvironment with sane defaults.
func DefaultEnvironmentConfig() *EnvironmentConfig {
config := &EnvironmentConfig{}
config.Commands = make([]string, 0)
config.Ui = &BasicUi{
Reader: os.Stdin,
Writer: os.Stdout,
@ -98,7 +80,6 @@ func NewEnvironment(config *EnvironmentConfig) (resultEnv Environment, err error
env := &coreEnvironment{}
env.cache = config.Cache
env.commands = config.Commands
env.components = config.Components
env.ui = config.Ui
@ -109,10 +90,6 @@ func NewEnvironment(config *EnvironmentConfig) (resultEnv Environment, err error
env.components.Builder = func(string) (Builder, error) { return nil, nil }
}
if env.components.Command == nil {
env.components.Command = func(string) (Command, error) { return nil, nil }
}
if env.components.Hook == nil {
env.components.Hook = func(string) (Hook, error) { return nil, nil }
}
@ -199,159 +176,6 @@ func (e *coreEnvironment) Provisioner(name string) (p Provisioner, err error) {
return
}
// Executes a command as if it was typed on the command-line interface.
// The return value is the exit code of the command.
func (e *coreEnvironment) Cli(args []string) (result int, err error) {
log.Printf("Environment.Cli: %#v\n", args)
// If we have no arguments, just short-circuit here and print the help
if len(args) == 0 {
e.printHelp()
return 1, nil
}
// This variable will track whether or not we're supposed to print
// the help or not.
isHelp := false
for _, arg := range args {
if arg == "-h" || arg == "--help" {
isHelp = true
break
}
}
// Trim up to the command name
for i, v := range args {
if len(v) > 0 && v[0] != '-' {
args = args[i:]
break
}
}
log.Printf("command + args: %#v", args)
version := args[0] == "version"
if !version {
for _, arg := range args {
if arg == "--version" || arg == "-v" {
version = true
break
}
}
}
var command Command
if version {
command = new(versionCommand)
}
if command == nil {
command, err = e.components.Command(args[0])
if err != nil {
return
}
// If we still don't have a command, show the help.
if command == nil {
e.ui.Error(fmt.Sprintf("Unknown command: %s\n", args[0]))
e.printHelp()
return 1, nil
}
}
// If we're supposed to print help, then print the help of the
// command rather than running it.
if isHelp {
e.ui.Say(command.Help())
return 0, nil
}
log.Printf("Executing command: %s\n", args[0])
return command.Run(e, args[1:]), nil
}
// Prints the CLI help to the UI.
func (e *coreEnvironment) printHelp() {
// Created a sorted slice of the map keys and record the longest
// command name so we can better format the output later.
maxKeyLen := 0
for _, command := range e.commands {
if len(command) > maxKeyLen {
maxKeyLen = len(command)
}
}
// Sort the keys
sort.Strings(e.commands)
// Create the communication/sync mechanisms to get the synopsis' of
// the various commands. We do this in parallel since the overhead
// of the subprocess underneath is very expensive and this speeds things
// up an incredible amount.
var wg sync.WaitGroup
ch := make(chan *helpCommandEntry)
for i, key := range e.commands {
wg.Add(1)
// Get the synopsis in a goroutine since it may take awhile
// to subprocess out.
go func(i int, key string) {
defer wg.Done()
var synopsis string
command, err := e.components.Command(key)
if err != nil {
synopsis = fmt.Sprintf("Error loading command: %s", err.Error())
} else if command == nil {
return
} else {
synopsis = command.Synopsis()
}
// Pad the key with spaces so that they're all the same width
key = fmt.Sprintf("%s%s", key, strings.Repeat(" ", maxKeyLen-len(key)))
// Output the command and the synopsis
ch <- &helpCommandEntry{
i: i,
key: key,
synopsis: synopsis,
}
}(i, key)
}
e.ui.Say("usage: packer [--version] [--help] <command> [<args>]\n")
e.ui.Say("Available commands are:")
// Make a goroutine that just waits for all the synopsis gathering
// to complete, and then output it.
synopsisDone := make(chan struct{})
go func() {
defer close(synopsisDone)
entries := make([]string, len(e.commands))
for entry := range ch {
e.ui.Machine("command", entry.key, entry.synopsis)
message := fmt.Sprintf(" %s %s", entry.key, entry.synopsis)
entries[entry.i] = message
}
for _, message := range entries {
if message != "" {
e.ui.Say(message)
}
}
}()
// Wait to complete getting the synopsis' then close the channel
wg.Wait()
close(ch)
<-synopsisDone
e.ui.Say("\nGlobally recognized options:")
e.ui.Say(" -machine-readable Machine-readable output format.")
}
// Returns the UI for the environment. The UI is the interface that should
// be used for all communication with the outside world.
func (e *coreEnvironment) Ui() Ui {

121
packer/environment_test.go
View File

@ -6,8 +6,6 @@ import (
"io/ioutil"
"log"
"os"
"reflect"
"strings"
"testing"
)
@ -43,13 +41,6 @@ func testEnvironment() Environment {
return env
}
func TestEnvironment_DefaultConfig_Commands(t *testing.T) {
config := DefaultEnvironmentConfig()
if len(config.Commands) != 0 {
t.Fatalf("bad: %#v", config.Commands)
}
}
func TestEnvironment_DefaultConfig_Ui(t *testing.T) {
config := DefaultEnvironmentConfig()
if config.Ui == nil {
@ -91,7 +82,6 @@ func TestEnvironment_NilComponents(t *testing.T) {
// anything but if there is a panic in the test then yeah, something
// went wrong.
env.Builder("foo")
env.Cli([]string{"foo"})
env.Hook("foo")
env.PostProcessor("foo")
env.Provisioner("foo")
@ -154,117 +144,6 @@ func TestEnvironment_Cache(t *testing.T) {
}
}
func TestEnvironment_Cli_Error(t *testing.T) {
config := DefaultEnvironmentConfig()
config.Components.Command = func(n string) (Command, error) { return nil, errors.New("foo") }
env, _ := NewEnvironment(config)
_, err := env.Cli([]string{"foo"})
if err == nil {
t.Fatal("should have error")
}
if err.Error() != "foo" {
t.Fatalf("bad: %s", err)
}
}
func TestEnvironment_Cli_CallsRun(t *testing.T) {
command := &TestCommand{}
commands := make(map[string]Command)
commands["foo"] = command
config := &EnvironmentConfig{}
config.Commands = []string{"foo"}
config.Components.Command = func(n string) (Command, error) { return commands[n], nil }
env, _ := NewEnvironment(config)
exitCode, err := env.Cli([]string{"foo", "bar", "baz"})
if err != nil {
t.Fatalf("err: %s", err)
}
if exitCode != 0 {
t.Fatalf("bad: %d", exitCode)
}
if !command.runCalled {
t.Fatal("command should be run")
}
if command.runEnv != env {
t.Fatalf("bad env: %#v", command.runEnv)
}
if !reflect.DeepEqual(command.runArgs, []string{"bar", "baz"}) {
t.Fatalf("bad: %#v", command.runArgs)
}
}
func TestEnvironment_DefaultCli_Empty(t *testing.T) {
defaultEnv := testEnvironment()
// Test with no args
exitCode, _ := defaultEnv.Cli([]string{})
if exitCode != 1 {
t.Fatalf("bad: %d", exitCode)
}
// Test with only blank args
exitCode, _ = defaultEnv.Cli([]string{""})
if exitCode != 1 {
t.Fatalf("bad: %d", exitCode)
}
}
func TestEnvironment_DefaultCli_Help(t *testing.T) {
defaultEnv := testEnvironment()
// A little lambda to help us test the output actually contains help
testOutput := func() {
buffer := defaultEnv.Ui().(*BasicUi).Writer.(*bytes.Buffer)
output := buffer.String()
buffer.Reset()
if !strings.Contains(output, "usage: packer") {
t.Fatalf("should contain help: %#v", output)
}
}
// Test "--help"
exitCode, _ := defaultEnv.Cli([]string{"--help"})
if exitCode != 1 {
t.Fatalf("bad: %d", exitCode)
}
testOutput()
// Test "-h"
exitCode, _ = defaultEnv.Cli([]string{"--help"})
if exitCode != 1 {
t.Fatalf("bad: %d", exitCode)
}
testOutput()
}
func TestEnvironment_DefaultCli_Version(t *testing.T) {
defaultEnv := testEnvironment()
versionCommands := []string{"version", "--version", "-v"}
for _, command := range versionCommands {
exitCode, _ := defaultEnv.Cli([]string{command})
if exitCode != 0 {
t.Fatalf("bad: %d", exitCode)
}
// Test the --version and -v can appear anywhere
exitCode, _ = defaultEnv.Cli([]string{"bad", command})
if command != "version" {
if exitCode != 0 {
t.Fatalf("bad: %d", exitCode)
}
} else {
if exitCode != 1 {
t.Fatalf("bad: %d", exitCode)
}
}
}
}
func TestEnvironment_Hook(t *testing.T) {
hook := &MockHook{}
hooks := make(map[string]Hook)