rclone/vfs/vfstest/write.go

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package vfstest
import (
"os"
"runtime"
"testing"
"github.com/rclone/rclone/vfs/vfscommon"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
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// TestWriteFileNoWrite tests writing a file with no write()'s to it
func TestWriteFileNoWrite(t *testing.T) {
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run.skipIfNoFUSE(t)
fd, err := osCreate(run.path("testnowrite"))
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require.NoError(t, err)
err = fd.Close()
assert.NoError(t, err)
run.waitForWriters()
run.checkDir(t, "testnowrite 0")
run.rm(t, "testnowrite")
}
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// FIXMETestWriteOpenFileInDirListing tests open file in directory listing
func FIXMETestWriteOpenFileInDirListing(t *testing.T) {
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run.skipIfNoFUSE(t)
fd, err := osCreate(run.path("testnowrite"))
assert.NoError(t, err)
run.checkDir(t, "testnowrite 0")
err = fd.Close()
assert.NoError(t, err)
run.waitForWriters()
run.rm(t, "testnowrite")
}
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// TestWriteFileWrite tests writing a file and reading it back
func TestWriteFileWrite(t *testing.T) {
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run.skipIfNoFUSE(t)
run.createFile(t, "testwrite", "data")
run.checkDir(t, "testwrite 4")
contents := run.readFile(t, "testwrite")
assert.Equal(t, "data", contents)
run.rm(t, "testwrite")
}
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// TestWriteFileOverwrite tests overwriting a file
func TestWriteFileOverwrite(t *testing.T) {
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run.skipIfNoFUSE(t)
run.createFile(t, "testwrite", "data")
run.checkDir(t, "testwrite 4")
run.createFile(t, "testwrite", "potato")
contents := run.readFile(t, "testwrite")
assert.Equal(t, "potato", contents)
run.rm(t, "testwrite")
}
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// TestWriteFileFsync tests Fsync
//
// NB the code for this is in file.go rather than write.go
func TestWriteFileFsync(t *testing.T) {
run.skipIfNoFUSE(t)
filepath := run.path("to be synced")
fd, err := osCreate(filepath)
require.NoError(t, err)
_, err = fd.Write([]byte("hello"))
require.NoError(t, err)
err = fd.Sync()
require.NoError(t, err)
err = fd.Close()
require.NoError(t, err)
run.waitForWriters()
run.rm(t, "to be synced")
}
// TestWriteFileDup tests behavior of mmap() in Python by using dup() on a file handle
func TestWriteFileDup(t *testing.T) {
run.skipIfVFS(t)
run.skipIfNoFUSE(t)
if run.vfsOpt.CacheMode < vfscommon.CacheModeWrites {
t.Skip("not supported on vfs-cache-mode < writes")
return
}
filepath := run.path("to be synced")
fh, err := osCreate(filepath)
require.NoError(t, err)
testData := []byte("0123456789")
err = fh.Truncate(int64(len(testData) + 2))
require.NoError(t, err)
err = fh.Sync()
require.NoError(t, err)
var dupFd uintptr
dupFd, err = writeTestDup(fh.Fd())
require.NoError(t, err)
dupFile := os.NewFile(dupFd, fh.Name())
_, err = dupFile.Write(testData)
require.NoError(t, err)
err = dupFile.Close()
require.NoError(t, err)
_, err = fh.Seek(int64(len(testData)), 0)
require.NoError(t, err)
_, err = fh.Write([]byte("10"))
require.NoError(t, err)
err = fh.Close()
require.NoError(t, err)
run.waitForWriters()
run.rm(t, "to be synced")
}
// TestWriteFileAppend tests that O_APPEND works on cache backends >= writes
func TestWriteFileAppend(t *testing.T) {
run.skipIfNoFUSE(t)
if run.vfsOpt.CacheMode < vfscommon.CacheModeWrites {
t.Skip("not supported on vfs-cache-mode < writes")
return
}
// TODO: Windows needs the v1.5 release of WinFsp to handle O_APPEND properly.
// Until it gets released, skip this test on Windows.
if runtime.GOOS == "windows" {
t.Skip("currently unsupported on Windows")
}
filepath := run.path("to be synced")
fh, err := osCreate(filepath)
require.NoError(t, err)
testData := []byte("0123456789")
appendData := []byte("10")
_, err = fh.Write(testData)
require.NoError(t, err)
err = fh.Close()
require.NoError(t, err)
fh, err = osAppend(filepath)
require.NoError(t, err)
_, err = fh.Write(appendData)
require.NoError(t, err)
err = fh.Close()
require.NoError(t, err)
info, err := run.os.Stat(filepath)
require.NoError(t, err)
require.EqualValues(t, len(testData)+len(appendData), info.Size())
run.waitForWriters()
run.rm(t, "to be synced")
}