terraform/internal/states/statemgr/filesystem_test.go

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package statemgr
import (
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"strings"
"sync"
"testing"
"github.com/go-test/deep"
version "github.com/hashicorp/go-version"
"github.com/zclconf/go-cty/cty"
"github.com/hashicorp/terraform/internal/addrs"
"github.com/hashicorp/terraform/internal/states"
"github.com/hashicorp/terraform/internal/states/statefile"
tfversion "github.com/hashicorp/terraform/version"
)
func TestFilesystem(t *testing.T) {
defer testOverrideVersion(t, "1.2.3")()
ls := testFilesystem(t)
defer os.Remove(ls.readPath)
TestFull(t, ls)
}
func TestFilesystemRace(t *testing.T) {
defer testOverrideVersion(t, "1.2.3")()
ls := testFilesystem(t)
defer os.Remove(ls.readPath)
current := TestFullInitialState()
var wg sync.WaitGroup
for i := 0; i < 100; i++ {
wg.Add(1)
go func() {
defer wg.Done()
ls.WriteState(current)
}()
}
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wg.Wait()
}
func TestFilesystemLocks(t *testing.T) {
defer testOverrideVersion(t, "1.2.3")()
s := testFilesystem(t)
defer os.Remove(s.readPath)
// lock first
info := NewLockInfo()
info.Operation = "test"
lockID, err := s.Lock(info)
if err != nil {
t.Fatal(err)
}
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out, err := exec.Command("go", "run", "testdata/lockstate.go", s.path).CombinedOutput()
if err != nil {
t.Fatal("unexpected lock failure", err, string(out))
}
if !strings.Contains(string(out), "lock failed") {
t.Fatal("expected 'locked failed', got", string(out))
}
// check our lock info
lockInfo, err := s.lockInfo()
if err != nil {
t.Fatal(err)
}
if lockInfo.Operation != "test" {
t.Fatalf("invalid lock info %#v\n", lockInfo)
}
// a noop, since we unlock on exit
if err := s.Unlock(lockID); err != nil {
t.Fatal(err)
}
// local locks can re-lock
lockID, err = s.Lock(info)
if err != nil {
t.Fatal(err)
}
if err := s.Unlock(lockID); err != nil {
t.Fatal(err)
}
// we should not be able to unlock the same lock twice
if err := s.Unlock(lockID); err == nil {
t.Fatal("unlocking an unlocked state should fail")
}
// make sure lock info is gone
lockInfoPath := s.lockInfoPath()
if _, err := os.Stat(lockInfoPath); !os.IsNotExist(err) {
t.Fatal("lock info not removed")
}
}
// Verify that we can write to the state file, as Windows' mandatory locking
// will prevent writing to a handle different than the one that hold the lock.
func TestFilesystem_writeWhileLocked(t *testing.T) {
defer testOverrideVersion(t, "1.2.3")()
s := testFilesystem(t)
defer os.Remove(s.readPath)
// lock first
info := NewLockInfo()
info.Operation = "test"
lockID, err := s.Lock(info)
if err != nil {
t.Fatal(err)
}
defer func() {
if err := s.Unlock(lockID); err != nil {
t.Fatal(err)
}
}()
if err := s.WriteState(TestFullInitialState()); err != nil {
t.Fatal(err)
}
}
func TestFilesystem_pathOut(t *testing.T) {
defer testOverrideVersion(t, "1.2.3")()
f, err := ioutil.TempFile("", "tf")
if err != nil {
t.Fatalf("err: %s", err)
}
f.Close()
defer os.Remove(f.Name())
ls := testFilesystem(t)
ls.path = f.Name()
defer os.Remove(ls.path)
TestFull(t, ls)
}
func TestFilesystem_backup(t *testing.T) {
defer testOverrideVersion(t, "1.2.3")()
f, err := ioutil.TempFile("", "tf")
if err != nil {
t.Fatalf("err: %s", err)
}
f.Close()
defer os.Remove(f.Name())
ls := testFilesystem(t)
backupPath := f.Name()
ls.SetBackupPath(backupPath)
TestFull(t, ls)
// The backup functionality should've saved a copy of the original state
// prior to all of the modifications that TestFull does.
bfh, err := os.Open(backupPath)
if err != nil {
t.Fatal(err)
}
bf, err := statefile.Read(bfh)
if err != nil {
t.Fatal(err)
}
origState := TestFullInitialState()
if !bf.State.Equal(origState) {
for _, problem := range deep.Equal(origState, bf.State) {
t.Error(problem)
}
}
}
// This test verifies a particularly tricky behavior where the input file
// is overridden and backups are enabled at the same time. This combination
// requires special care because we must ensure that when we create a backup
// it is of the original contents of the output file (which we're overwriting),
// not the contents of the input file (which is left unchanged).
func TestFilesystem_backupAndReadPath(t *testing.T) {
defer testOverrideVersion(t, "1.2.3")()
workDir, err := ioutil.TempDir("", "tf")
if err != nil {
t.Fatalf("failed to create temporary directory: %s", err)
}
defer os.RemoveAll(workDir)
markerOutput := addrs.OutputValue{Name: "foo"}.Absolute(addrs.RootModuleInstance)
outState := states.BuildState(func(ss *states.SyncState) {
ss.SetOutputValue(
markerOutput,
cty.StringVal("from-output-state"),
false, // not sensitive
)
})
outFile, err := os.Create(filepath.Join(workDir, "output.tfstate"))
if err != nil {
t.Fatalf("failed to create temporary outFile %s", err)
}
defer outFile.Close()
err = statefile.Write(&statefile.File{
Lineage: "-",
Serial: 0,
TerraformVersion: version.Must(version.NewVersion("1.2.3")),
State: outState,
}, outFile)
if err != nil {
t.Fatalf("failed to write initial outfile state to %s: %s", outFile.Name(), err)
}
inState := states.BuildState(func(ss *states.SyncState) {
ss.SetOutputValue(
markerOutput,
cty.StringVal("from-input-state"),
false, // not sensitive
)
})
inFile, err := os.Create(filepath.Join(workDir, "input.tfstate"))
if err != nil {
t.Fatalf("failed to create temporary inFile %s", err)
}
defer inFile.Close()
err = statefile.Write(&statefile.File{
Lineage: "-",
Serial: 0,
TerraformVersion: version.Must(version.NewVersion("1.2.3")),
State: inState,
}, inFile)
if err != nil {
t.Fatalf("failed to write initial infile state to %s: %s", inFile.Name(), err)
}
backupPath := outFile.Name() + ".backup"
ls := NewFilesystemBetweenPaths(inFile.Name(), outFile.Name())
ls.SetBackupPath(backupPath)
newState := states.BuildState(func(ss *states.SyncState) {
ss.SetOutputValue(
markerOutput,
cty.StringVal("from-new-state"),
false, // not sensitive
)
})
err = ls.WriteState(newState)
if err != nil {
t.Fatalf("failed to write new state: %s", err)
}
// The backup functionality should've saved a copy of the original contents
// of the _output_ file, even though the first snapshot was read from
// the _input_ file.
t.Run("backup file", func(t *testing.T) {
bfh, err := os.Open(backupPath)
if err != nil {
t.Fatal(err)
}
bf, err := statefile.Read(bfh)
if err != nil {
t.Fatal(err)
}
os := bf.State.OutputValue(markerOutput)
if got, want := os.Value, cty.StringVal("from-output-state"); !want.RawEquals(got) {
t.Errorf("wrong marker value in backup state file\ngot: %#v\nwant: %#v", got, want)
}
})
t.Run("output file", func(t *testing.T) {
ofh, err := os.Open(outFile.Name())
if err != nil {
t.Fatal(err)
}
of, err := statefile.Read(ofh)
if err != nil {
t.Fatal(err)
}
os := of.State.OutputValue(markerOutput)
if got, want := os.Value, cty.StringVal("from-new-state"); !want.RawEquals(got) {
t.Errorf("wrong marker value in backup state file\ngot: %#v\nwant: %#v", got, want)
}
})
}
func TestFilesystem_nonExist(t *testing.T) {
defer testOverrideVersion(t, "1.2.3")()
ls := NewFilesystem("ishouldntexist")
if err := ls.RefreshState(); err != nil {
t.Fatalf("err: %s", err)
}
if state := ls.State(); state != nil {
t.Fatalf("bad: %#v", state)
}
}
func TestFilesystem_lockUnlockWithoutWrite(t *testing.T) {
info := NewLockInfo()
info.Operation = "test"
ls := testFilesystem(t)
// Delete the just-created tempfile so that Lock recreates it
os.Remove(ls.path)
// Lock the state, and in doing so recreate the tempfile
lockID, err := ls.Lock(info)
if err != nil {
t.Fatal(err)
}
if !ls.created {
t.Fatal("should have marked state as created")
}
if err := ls.Unlock(lockID); err != nil {
t.Fatal(err)
}
_, err = os.Stat(ls.path)
if os.IsNotExist(err) {
// Success! Unlocking the state successfully deleted the tempfile
return
} else if err != nil {
t.Fatalf("unexpected error from os.Stat: %s", err)
} else {
os.Remove(ls.readPath)
t.Fatal("should have removed path, but exists")
}
}
func TestFilesystem_impl(t *testing.T) {
defer testOverrideVersion(t, "1.2.3")()
var _ Reader = new(Filesystem)
var _ Writer = new(Filesystem)
var _ Persister = new(Filesystem)
var _ Refresher = new(Filesystem)
var _ Locker = new(Filesystem)
}
func testFilesystem(t *testing.T) *Filesystem {
f, err := ioutil.TempFile("", "tf")
if err != nil {
t.Fatalf("failed to create temporary file %s", err)
}
t.Logf("temporary state file at %s", f.Name())
err = statefile.Write(&statefile.File{
Lineage: "test-lineage",
Serial: 0,
TerraformVersion: version.Must(version.NewVersion("1.2.3")),
State: TestFullInitialState(),
}, f)
if err != nil {
t.Fatalf("failed to write initial state to %s: %s", f.Name(), err)
}
f.Close()
ls := NewFilesystem(f.Name())
if err := ls.RefreshState(); err != nil {
t.Fatalf("initial refresh failed: %s", err)
}
return ls
}
// Make sure we can refresh while the state is locked
func TestFilesystem_refreshWhileLocked(t *testing.T) {
defer testOverrideVersion(t, "1.2.3")()
f, err := ioutil.TempFile("", "tf")
if err != nil {
t.Fatalf("err: %s", err)
}
err = statefile.Write(&statefile.File{
Lineage: "test-lineage",
Serial: 0,
TerraformVersion: version.Must(version.NewVersion("1.2.3")),
State: TestFullInitialState(),
}, f)
if err != nil {
t.Fatalf("err: %s", err)
}
f.Close()
s := NewFilesystem(f.Name())
defer os.Remove(s.path)
// lock first
info := NewLockInfo()
info.Operation = "test"
lockID, err := s.Lock(info)
if err != nil {
t.Fatal(err)
}
defer func() {
if err := s.Unlock(lockID); err != nil {
t.Fatal(err)
}
}()
if err := s.RefreshState(); err != nil {
t.Fatal(err)
}
readState := s.State()
if readState == nil {
t.Fatal("missing state")
}
}
func testOverrideVersion(t *testing.T, v string) func() {
oldVersionStr := tfversion.Version
oldPrereleaseStr := tfversion.Prerelease
oldSemVer := tfversion.SemVer
var newPrereleaseStr string
if dash := strings.Index(v, "-"); dash != -1 {
newPrereleaseStr = v[dash+1:]
v = v[:dash]
}
newSemVer, err := version.NewVersion(v)
if err != nil {
t.Errorf("invalid override version %q: %s", v, err)
}
newVersionStr := newSemVer.String()
tfversion.Version = newVersionStr
tfversion.Prerelease = newPrereleaseStr
tfversion.SemVer = newSemVer
return func() { // reset function
tfversion.Version = oldVersionStr
tfversion.Prerelease = oldPrereleaseStr
tfversion.SemVer = oldSemVer
}
}