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package ioutils
import (
"bytes"
"os"
"path/filepath"
"runtime"
"testing"
)
var testMode os.FileMode = 0o640
func init() {
// Windows does not support full Linux file mode
if runtime.GOOS == "windows" {
testMode = 0o666
}
}
func TestAtomicWriteToFile(t *testing.T) {
tmpDir := t.TempDir()
expected := []byte("barbaz")
if err := AtomicWriteFile(filepath.Join(tmpDir, "foo"), expected, testMode); err != nil {
t.Fatalf("Error writing to file: %v", err)
}
actual, err := os.ReadFile(filepath.Join(tmpDir, "foo"))
if err != nil {
t.Fatalf("Error reading from file: %v", err)
}
if !bytes.Equal(actual, expected) {
t.Fatalf("Data mismatch, expected %q, got %q", expected, actual)
}
st, err := os.Stat(filepath.Join(tmpDir, "foo"))
if err != nil {
t.Fatalf("Error statting file: %v", err)
}
if expected := testMode; st.Mode() != expected {
t.Fatalf("Mode mismatched, expected %o, got %o", expected, st.Mode())
}
}
func TestAtomicCommitAndRollbackFile(t *testing.T) {
tmpDir := t.TempDir()
path := filepath.Join(tmpDir, "foo")
oldData := "olddata"
newData := "newdata"
check := func(n int, initData string, writeData string, expected string, explicit bool, commit bool) {
if err := os.WriteFile(path, []byte(initData), 0o644); err != nil {
t.Fatalf("Failed creating initial file: %v", err)
}
opts := &AtomicFileWriterOptions{ExplicitCommit: explicit}
w, err := NewAtomicFileWriterWithOpts(filepath.Join(tmpDir, "foo"), 0o644, opts)
if err != nil {
t.Fatalf("(%d) Failed creating writer: %v", n, err)
}
if _, err := w.Write([]byte(writeData)); err != nil {
t.Fatalf("(%d) Failed writing content: %v", n, err)
}
if commit {
if err := w.Commit(); err != nil {
t.Fatalf("(%d) Failed committing writer: %v", n, err)
}
}
if err := w.Close(); err != nil {
t.Fatalf("(%d) Failed closing writer: %v", n, err)
}
actual, err := os.ReadFile(filepath.Join(tmpDir, "foo"))
if err != nil {
t.Fatalf("(%d) Error reading from file: %v", n, err)
}
// Verify write never happened since no call to commit
if !bytes.Equal(actual, []byte(expected)) {
t.Fatalf("(%d) Data mismatch, expected %q, got %q", n, expected, actual)
}
}
check(1, oldData, newData, oldData, true, false)
check(2, oldData, newData, newData, true, true)
check(3, oldData, newData, newData, false, false)
check(4, oldData, newData, newData, false, true)
}
func TestAtomicWriteSetCommit(t *testing.T) {
tmpDir := t.TempDir()
if err := os.Mkdir(filepath.Join(tmpDir, "tmp"), 0o700); err != nil {
t.Fatalf("Error creating tmp directory: %s", err)
}
targetDir := filepath.Join(tmpDir, "target")
ws, err := NewAtomicWriteSet(filepath.Join(tmpDir, "tmp"))
if err != nil {
t.Fatalf("Error creating atomic write set: %s", err)
}
expected := []byte("barbaz")
if err := ws.WriteFile("foo", expected, testMode); err != nil {
t.Fatalf("Error writing to file: %v", err)
}
if _, err := os.ReadFile(filepath.Join(targetDir, "foo")); err == nil {
t.Fatalf("Expected error reading file where should not exist")
}
if err := ws.Commit(targetDir); err != nil {
t.Fatalf("Error committing file: %s", err)
}
actual, err := os.ReadFile(filepath.Join(targetDir, "foo"))
if err != nil {
t.Fatalf("Error reading from file: %v", err)
}
if !bytes.Equal(actual, expected) {
t.Fatalf("Data mismatch, expected %q, got %q", expected, actual)
}
st, err := os.Stat(filepath.Join(targetDir, "foo"))
if err != nil {
t.Fatalf("Error statting file: %v", err)
}
if expected := testMode; st.Mode() != expected {
t.Fatalf("Mode mismatched, expected %o, got %o", expected, st.Mode())
}
}
func TestAtomicWriteSetCancel(t *testing.T) {
tmpDir := t.TempDir()
if err := os.Mkdir(filepath.Join(tmpDir, "tmp"), 0o700); err != nil {
t.Fatalf("Error creating tmp directory: %s", err)
}
ws, err := NewAtomicWriteSet(filepath.Join(tmpDir, "tmp"))
if err != nil {
t.Fatalf("Error creating atomic write set: %s", err)
}
expected := []byte("barbaz")
if err := ws.WriteFile("foo", expected, testMode); err != nil {
t.Fatalf("Error writing to file: %v", err)
}
if err := ws.Cancel(); err != nil {
t.Fatalf("Error committing file: %s", err)
}
if _, err := os.ReadFile(filepath.Join(tmpDir, "target", "foo")); err == nil {
t.Fatalf("Expected error reading file where should not exist")
} else if !os.IsNotExist(err) {
t.Fatalf("Unexpected error reading file: %s", err)
}
}
|
