terraform/command/command_test.go

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package command
import (
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"bytes"
"crypto/md5"
"encoding/base64"
"encoding/json"
"flag"
"fmt"
"io"
"io/ioutil"
"log"
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"net/http"
"net/http/httptest"
"os"
"os/exec"
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"path/filepath"
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"strings"
"syscall"
"testing"
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"github.com/zclconf/go-cty/cty"
"github.com/hashicorp/terraform/addrs"
"github.com/hashicorp/terraform/configs"
"github.com/hashicorp/terraform/configs/configload"
"github.com/hashicorp/terraform/configs/configschema"
"github.com/hashicorp/terraform/helper/logging"
"github.com/hashicorp/terraform/plans"
"github.com/hashicorp/terraform/plans/planfile"
"github.com/hashicorp/terraform/providers"
"github.com/hashicorp/terraform/provisioners"
"github.com/hashicorp/terraform/states"
"github.com/hashicorp/terraform/states/statefile"
"github.com/hashicorp/terraform/states/statemgr"
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"github.com/hashicorp/terraform/terraform"
"github.com/hashicorp/terraform/version"
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)
// This is the directory where our test fixtures are.
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var fixtureDir = "./test-fixtures"
// a top level temp directory which will be cleaned after all tests
var testingDir string
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func init() {
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test = true
// Initialize the backends
backendInit.Init(nil)
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// Expand the fixture dir on init because we change the working
// directory in some tests.
var err error
fixtureDir, err = filepath.Abs(fixtureDir)
if err != nil {
panic(err)
}
testingDir, err = ioutil.TempDir(testingDir, "tf")
if err != nil {
panic(err)
}
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}
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func TestMain(m *testing.M) {
defer os.RemoveAll(testingDir)
flag.Parse()
if testing.Verbose() {
// if we're verbose, use the logging requested by TF_LOG
logging.SetOutput()
} else {
// otherwise silence all logs
log.SetOutput(ioutil.Discard)
}
os.Exit(m.Run())
}
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func tempDir(t *testing.T) string {
t.Helper()
dir, err := ioutil.TempDir(testingDir, "tf")
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if err != nil {
t.Fatalf("err: %s", err)
}
if err := os.RemoveAll(dir); err != nil {
t.Fatalf("err: %s", err)
}
return dir
}
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func testFixturePath(name string) string {
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return filepath.Join(fixtureDir, name)
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}
func metaOverridesForProvider(p providers.Interface) *testingOverrides {
return &testingOverrides{
ProviderResolver: providers.ResolverFixed(
map[string]providers.Factory{
"test": providers.FactoryFixed(p),
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},
),
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}
}
func metaOverridesForProviderAndProvisioner(p providers.Interface, pr provisioners.Interface) *testingOverrides {
return &testingOverrides{
ProviderResolver: providers.ResolverFixed(
map[string]providers.Factory{
"test": providers.FactoryFixed(p),
},
),
Provisioners: map[string]provisioners.Factory{
"shell": provisioners.FactoryFixed(pr),
},
}
}
func testModule(t *testing.T, name string) *configs.Config {
t.Helper()
c, _ := testModuleWithSnapshot(t, name)
return c
}
func testModuleWithSnapshot(t *testing.T, name string) (*configs.Config, *configload.Snapshot) {
t.Helper()
dir := filepath.Join(fixtureDir, name)
// FIXME: We're not dealing with the cleanup function here because
// this testModule function is used all over and so we don't want to
// change its interface at this late stage.
loader, _ := configload.NewLoaderForTests(t)
// Test modules usually do not refer to remote sources, and for local
// sources only this ultimately just records all of the module paths
// in a JSON file so that we can load them below.
diags := loader.InstallModules(dir, true, configload.InstallHooksImpl{})
if diags.HasErrors() {
t.Fatal(diags.Error())
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}
config, snap, diags := loader.LoadConfigWithSnapshot(dir)
if diags.HasErrors() {
t.Fatal(diags.Error())
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}
return config, snap
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}
// testPlan returns a non-nil noop plan.
func testPlan(t *testing.T) *plans.Plan {
t.Helper()
// This is what an empty configuration block would look like after being
// decoded with the schema of the "local" backend.
backendConfig := cty.ObjectVal(map[string]cty.Value{
"path": cty.NullVal(cty.String),
"workspace_dir": cty.NullVal(cty.String),
})
backendConfigRaw, err := plans.NewDynamicValue(backendConfig, backendConfig.Type())
if err != nil {
t.Fatal(err)
}
return &plans.Plan{
Backend: plans.Backend{
// This is just a placeholder so that the plan file can be written
// out. Caller may wish to override it to something more "real"
// where the plan will actually be subsequently applied.
Type: "local",
Config: backendConfigRaw,
},
Changes: plans.NewChanges(),
}
}
func testPlanFile(t *testing.T, configSnap *configload.Snapshot, state *states.State, plan *plans.Plan) string {
t.Helper()
stateFile := &statefile.File{
Lineage: "",
State: state,
TerraformVersion: version.SemVer,
}
path := testTempFile(t)
err := planfile.Create(path, configSnap, stateFile, plan)
if err != nil {
t.Fatalf("failed to create temporary plan file: %s", err)
}
return path
}
// testPlanFileNoop is a shortcut function that creates a plan file that
// represents no changes and returns its path. This is useful when a test
// just needs any plan file, and it doesn't matter what is inside it.
func testPlanFileNoop(t *testing.T) string {
snap := &configload.Snapshot{
Modules: map[string]*configload.SnapshotModule{
"": {
Dir: ".",
Files: map[string][]byte{
"main.tf": nil,
},
},
},
}
state := states.NewState()
plan := testPlan(t)
return testPlanFile(t, snap, state, plan)
}
func testReadPlan(t *testing.T, path string) *plans.Plan {
t.Helper()
f, err := planfile.Open(path)
if err != nil {
t.Fatalf("error opening plan file %q: %s", path, err)
}
defer f.Close()
p, err := f.ReadPlan()
if err != nil {
t.Fatalf("error reading plan from plan file %q: %s", path, err)
}
return p
}
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// testState returns a test State structure that we use for a lot of tests.
func testState() *states.State {
return states.BuildState(func(s *states.SyncState) {
s.SetResourceInstanceCurrent(
addrs.Resource{
Mode: addrs.ManagedResourceMode,
Type: "test_instance",
Name: "foo",
}.Instance(addrs.NoKey).Absolute(addrs.RootModuleInstance),
&states.ResourceInstanceObjectSrc{
// The weird whitespace here is reflective of how this would
// get written out in a real state file, due to the indentation
// of all of the containing wrapping objects and arrays.
AttrsJSON: []byte("{\n \"id\": \"bar\"\n }"),
Status: states.ObjectReady,
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},
addrs.ProviderConfig{
Type: "test",
}.Absolute(addrs.RootModuleInstance),
)
})
}
// writeStateForTesting is a helper that writes the given naked state to the
// given writer, generating a stub *statefile.File wrapper which is then
// immediately discarded.
func writeStateForTesting(state *states.State, w io.Writer) error {
sf := &statefile.File{
Serial: 0,
Lineage: "fake-for-testing",
State: state,
}
return statefile.Write(sf, w)
}
// testStateMgrCurrentLineage returns the current lineage for the given state
// manager, or the empty string if it does not use lineage. This is primarily
// for testing against the local backend, which always supports lineage.
func testStateMgrCurrentLineage(mgr statemgr.Persistent) string {
if pm, ok := mgr.(statemgr.PersistentMeta); ok {
m := pm.StateSnapshotMeta()
return m.Lineage
}
return ""
}
// markStateForMatching is a helper that writes a specific marker value to
// a state so that it can be recognized later with getStateMatchingMarker.
//
// Internally this just sets a root module output value called "testing_mark"
// to the given string value. If the state is being checked in other ways,
// the test code may need to compensate for the addition or overwriting of this
// special output value name.
//
// The given mark string is returned verbatim, to allow the following pattern
// in tests:
//
// mark := markStateForMatching(state, "foo")
// // (do stuff to the state)
// assertStateHasMarker(state, mark)
func markStateForMatching(state *states.State, mark string) string {
state.RootModule().SetOutputValue("testing_mark", cty.StringVal(mark), false)
return mark
}
// getStateMatchingMarker is used with markStateForMatching to retrieve the
// mark string previously added to the given state. If no such mark is present,
// the result is an empty string.
func getStateMatchingMarker(state *states.State) string {
os := state.RootModule().OutputValues["testing_mark"]
if os == nil {
return ""
}
v := os.Value
if v.Type() == cty.String && v.IsKnown() && !v.IsNull() {
return v.AsString()
}
return ""
}
// stateHasMarker is a helper around getStateMatchingMarker that also includes
// the equality test, for more convenient use in test assertion branches.
func stateHasMarker(state *states.State, want string) bool {
return getStateMatchingMarker(state) == want
}
// assertStateHasMarker wraps stateHasMarker to automatically generate a
// fatal test result (i.e. t.Fatal) if the marker doesn't match.
func assertStateHasMarker(t *testing.T, state *states.State, want string) {
if !stateHasMarker(state, want) {
t.Fatalf("wrong state marker\ngot: %q\nwant: %q", getStateMatchingMarker(state), want)
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}
}
func testStateFile(t *testing.T, s *states.State) string {
t.Helper()
path := testTempFile(t)
f, err := os.Create(path)
if err != nil {
t.Fatalf("failed to create temporary state file %s: %s", path, err)
}
defer f.Close()
err = writeStateForTesting(s, f)
if err != nil {
t.Fatalf("failed to write state to temporary file %s: %s", path, err)
}
return path
}
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// testStateFileDefault writes the state out to the default statefile
// in the cwd. Use `testCwd` to change into a temp cwd.
func testStateFileDefault(t *testing.T, s *terraform.State) string {
t.Helper()
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f, err := os.Create(DefaultStateFilename)
if err != nil {
t.Fatalf("err: %s", err)
}
defer f.Close()
if err := terraform.WriteState(s, f); err != nil {
t.Fatalf("err: %s", err)
}
return DefaultStateFilename
}
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// testStateFileRemote writes the state out to the remote statefile
// in the cwd. Use `testCwd` to change into a temp cwd.
func testStateFileRemote(t *testing.T, s *terraform.State) string {
t.Helper()
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path := filepath.Join(DefaultDataDir, DefaultStateFilename)
if err := os.MkdirAll(filepath.Dir(path), 0755); err != nil {
t.Fatalf("err: %s", err)
}
f, err := os.Create(path)
if err != nil {
t.Fatalf("err: %s", err)
}
defer f.Close()
if err := terraform.WriteState(s, f); err != nil {
t.Fatalf("err: %s", err)
}
return path
}
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// testStateRead reads the state from a file
func testStateRead(t *testing.T, path string) *states.State {
t.Helper()
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f, err := os.Open(path)
if err != nil {
t.Fatalf("err: %s", err)
}
defer f.Close()
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sf, err := statefile.Read(f)
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if err != nil {
t.Fatalf("err: %s", err)
}
return sf.State
}
// testDataStateRead reads a "data state", which is a file format resembling
// our state format v3 that is used only to track current backend settings.
//
// This old format still uses *terraform.State, but should be replaced with
// a more specialized type in a later release.
func testDataStateRead(t *testing.T, path string) *terraform.State {
t.Helper()
f, err := os.Open(path)
if err != nil {
t.Fatalf("err: %s", err)
}
defer f.Close()
s, err := terraform.ReadState(f)
if err != nil {
t.Fatalf("err: %s", err)
}
return s
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}
// testStateOutput tests that the state at the given path contains
// the expected state string.
func testStateOutput(t *testing.T, path string, expected string) {
t.Helper()
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newState := testStateRead(t, path)
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actual := strings.TrimSpace(newState.String())
expected = strings.TrimSpace(expected)
if actual != expected {
t.Fatalf("expected:\n%s\nactual:\n%s", expected, actual)
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}
}
func testProvider() *terraform.MockProvider {
p := new(terraform.MockProvider)
p.PlanResourceChangeResponse = providers.PlanResourceChangeResponse{
PlannedState: cty.EmptyObjectVal,
}
p.ReadResourceFn = func(req providers.ReadResourceRequest) providers.ReadResourceResponse {
return providers.ReadResourceResponse{
NewState: req.PriorState,
}
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}
return p
}
func testTempFile(t *testing.T) string {
t.Helper()
return filepath.Join(testTempDir(t), "state.tfstate")
}
func testTempDir(t *testing.T) string {
t.Helper()
d, err := ioutil.TempDir(testingDir, "tf")
if err != nil {
t.Fatalf("err: %s", err)
}
return d
}
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// testRename renames the path to new and returns a function to defer to
// revert the rename.
func testRename(t *testing.T, base, path, new string) func() {
t.Helper()
if base != "" {
path = filepath.Join(base, path)
new = filepath.Join(base, new)
}
if err := os.Rename(path, new); err != nil {
t.Fatalf("err: %s", err)
}
return func() {
// Just re-rename and ignore the return value
testRename(t, "", new, path)
}
}
// testChdir changes the directory and returns a function to defer to
// revert the old cwd.
func testChdir(t *testing.T, new string) func() {
t.Helper()
old, err := os.Getwd()
if err != nil {
t.Fatalf("err: %s", err)
}
if err := os.Chdir(new); err != nil {
t.Fatalf("err: %v", err)
}
return func() {
// Re-run the function ignoring the defer result
testChdir(t, old)
}
}
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// testCwd is used to change the current working directory
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// into a test directory that should be remoted after
func testCwd(t *testing.T) (string, string) {
t.Helper()
tmp, err := ioutil.TempDir(testingDir, "tf")
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if err != nil {
t.Fatalf("err: %v", err)
}
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cwd, err := os.Getwd()
if err != nil {
t.Fatalf("err: %v", err)
}
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if err := os.Chdir(tmp); err != nil {
t.Fatalf("err: %v", err)
}
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return tmp, cwd
}
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// testFixCwd is used to as a defer to testDir
func testFixCwd(t *testing.T, tmp, cwd string) {
t.Helper()
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if err := os.Chdir(cwd); err != nil {
t.Fatalf("err: %v", err)
}
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if err := os.RemoveAll(tmp); err != nil {
t.Fatalf("err: %v", err)
}
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}
// testStdinPipe changes os.Stdin to be a pipe that sends the data from
// the reader before closing the pipe.
//
// The returned function should be deferred to properly clean up and restore
// the original stdin.
func testStdinPipe(t *testing.T, src io.Reader) func() {
t.Helper()
r, w, err := os.Pipe()
if err != nil {
t.Fatalf("err: %s", err)
}
// Modify stdin to point to our new pipe
old := os.Stdin
os.Stdin = r
// Copy the data from the reader to the pipe
go func() {
defer w.Close()
io.Copy(w, src)
}()
return func() {
// Close our read end
r.Close()
// Reset stdin
os.Stdin = old
}
}
// Modify os.Stdout to write to the given buffer. Note that this is generally
// not useful since the commands are configured to write to a cli.Ui, not
// Stdout directly. Commands like `console` though use the raw stdout.
func testStdoutCapture(t *testing.T, dst io.Writer) func() {
t.Helper()
r, w, err := os.Pipe()
if err != nil {
t.Fatalf("err: %s", err)
}
// Modify stdout
old := os.Stdout
os.Stdout = w
// Copy
doneCh := make(chan struct{})
go func() {
defer close(doneCh)
defer r.Close()
io.Copy(dst, r)
}()
return func() {
// Close the writer end of the pipe
w.Sync()
w.Close()
// Reset stdout
os.Stdout = old
// Wait for the data copy to complete to avoid a race reading data
<-doneCh
}
}
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// testInteractiveInput configures tests so that the answers given are sent
// in order to interactive prompts. The returned function must be called
// in a defer to clean up.
func testInteractiveInput(t *testing.T, answers []string) func() {
t.Helper()
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// Disable test mode so input is called
test = false
// Setup reader/writers
testInputResponse = answers
defaultInputReader = bytes.NewBufferString("")
defaultInputWriter = new(bytes.Buffer)
// Return the cleanup
return func() {
test = true
testInputResponse = nil
}
}
// testInputMap configures tests so that the given answers are returned
// for calls to Input when the right question is asked. The key is the
// question "Id" that is used.
func testInputMap(t *testing.T, answers map[string]string) func() {
t.Helper()
// Disable test mode so input is called
test = false
// Setup reader/writers
defaultInputReader = bytes.NewBufferString("")
defaultInputWriter = new(bytes.Buffer)
// Setup answers
testInputResponse = nil
testInputResponseMap = answers
// Return the cleanup
return func() {
test = true
testInputResponseMap = nil
}
}
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// testBackendState is used to make a test HTTP server to test a configured
// backend. This returns the complete state that can be saved. Use
// `testStateFileRemote` to write the returned state.
func testBackendState(t *testing.T, s *terraform.State, c int) (*terraform.State, *httptest.Server) {
t.Helper()
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var b64md5 string
buf := bytes.NewBuffer(nil)
cb := func(resp http.ResponseWriter, req *http.Request) {
if req.Method == "PUT" {
resp.WriteHeader(c)
return
}
if s == nil {
resp.WriteHeader(404)
return
}
resp.Header().Set("Content-MD5", b64md5)
resp.Write(buf.Bytes())
}
// If a state was given, make sure we calculate the proper b64md5
if s != nil {
enc := json.NewEncoder(buf)
if err := enc.Encode(s); err != nil {
t.Fatalf("err: %v", err)
}
md5 := md5.Sum(buf.Bytes())
b64md5 = base64.StdEncoding.EncodeToString(md5[:16])
}
srv := httptest.NewServer(http.HandlerFunc(cb))
state := terraform.NewState()
state.Backend = &terraform.BackendState{
Type: "http",
ConfigRaw: json.RawMessage(fmt.Sprintf(`{"address":%q}`, srv.URL)),
Hash: 2529831861221416334,
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}
return state, srv
}
// testRemoteState is used to make a test HTTP server to return a given
// state file that can be used for testing legacy remote state.
//
// The return values are a *terraform.State instance that should be written
// as the "data state" (really: backend state) and the server that the
// returned data state refers to.
func testRemoteState(t *testing.T, s *states.State, c int) (*terraform.State, *httptest.Server) {
t.Helper()
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var b64md5 string
buf := bytes.NewBuffer(nil)
cb := func(resp http.ResponseWriter, req *http.Request) {
if req.Method == "PUT" {
resp.WriteHeader(c)
return
}
if s == nil {
resp.WriteHeader(404)
return
}
resp.Header().Set("Content-MD5", b64md5)
resp.Write(buf.Bytes())
}
retState := terraform.NewState()
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srv := httptest.NewServer(http.HandlerFunc(cb))
b := &terraform.BackendState{
Type: "http",
}
b.SetConfig(cty.ObjectVal(map[string]cty.Value{
"address": cty.StringVal(srv.URL),
}), &configschema.Block{
Attributes: map[string]*configschema.Attribute{
"address": {
Type: cty.String,
Required: true,
},
},
})
retState.Backend = b
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if s != nil {
err := statefile.Write(&statefile.File{State: s}, buf)
if err != nil {
t.Fatalf("failed to write initial state: %v", err)
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}
}
return retState, srv
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}
// testlockState calls a separate process to the lock the state file at path.
// deferFunc should be called in the caller to properly unlock the file.
// Since many tests change the working durectory, the sourcedir argument must be
// supplied to locate the statelocker.go source.
func testLockState(sourceDir, path string) (func(), error) {
// build and run the binary ourselves so we can quickly terminate it for cleanup
buildDir, err := ioutil.TempDir(testingDir, "locker")
if err != nil {
return nil, err
}
cleanFunc := func() {
os.RemoveAll(buildDir)
}
source := filepath.Join(sourceDir, "statelocker.go")
lockBin := filepath.Join(buildDir, "statelocker")
out, err := exec.Command("go", "build", "-o", lockBin, source).CombinedOutput()
if err != nil {
cleanFunc()
return nil, fmt.Errorf("%s %s", err, out)
}
locker := exec.Command(lockBin, path)
pr, pw, err := os.Pipe()
if err != nil {
cleanFunc()
return nil, err
}
defer pr.Close()
defer pw.Close()
locker.Stderr = pw
locker.Stdout = pw
if err := locker.Start(); err != nil {
return nil, err
}
deferFunc := func() {
cleanFunc()
locker.Process.Signal(syscall.SIGTERM)
locker.Wait()
}
// wait for the process to lock
buf := make([]byte, 1024)
n, err := pr.Read(buf)
if err != nil {
return deferFunc, fmt.Errorf("read from statelocker returned: %s", err)
}
output := string(buf[:n])
if !strings.HasPrefix(output, "LOCKID") {
return deferFunc, fmt.Errorf("statelocker wrote: %s", string(buf[:n]))
}
return deferFunc, nil
}
// normalizeJSON removes all insignificant whitespace from the given JSON buffer
// and returns it as a string for easier comparison.
func normalizeJSON(t *testing.T, src []byte) string {
t.Helper()
var buf bytes.Buffer
err := json.Compact(&buf, src)
if err != nil {
t.Fatalf("error normalizing JSON: %s", err)
}
return buf.String()
}