317 lines
8.3 KiB
Go
317 lines
8.3 KiB
Go
package sysfs
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import (
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"os"
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"path"
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"runtime"
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"testing"
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"time"
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experimentalsys "github.com/tetratelabs/wazero/experimental/sys"
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"github.com/tetratelabs/wazero/internal/testing/require"
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"github.com/tetratelabs/wazero/sys"
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)
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func TestStat(t *testing.T) {
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tmpDir := t.TempDir()
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_, errno := stat(path.Join(tmpDir, "cat"))
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require.EqualErrno(t, experimentalsys.ENOENT, errno)
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_, errno = stat(path.Join(tmpDir, "sub/cat"))
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require.EqualErrno(t, experimentalsys.ENOENT, errno)
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var st sys.Stat_t
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t.Run("empty dir", func(t *testing.T) {
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st, errno = stat(tmpDir)
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require.EqualErrno(t, 0, errno)
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require.True(t, st.Mode.IsDir())
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require.NotEqual(t, uint64(0), st.Ino)
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// We expect one link: the directory itself
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expectedNlink := uint64(1)
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if dirNlinkIncludesDot {
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expectedNlink++
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}
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require.Equal(t, expectedNlink, st.Nlink, runtime.GOOS)
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})
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subdir := path.Join(tmpDir, "sub")
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var stSubdir sys.Stat_t
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t.Run("subdir", func(t *testing.T) {
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require.NoError(t, os.Mkdir(subdir, 0o500))
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stSubdir, errno = stat(subdir)
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require.EqualErrno(t, 0, errno)
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require.True(t, stSubdir.Mode.IsDir())
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require.NotEqual(t, uint64(0), st.Ino)
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})
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t.Run("not empty dir", func(t *testing.T) {
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st, errno = stat(tmpDir)
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require.EqualErrno(t, 0, errno)
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// We expect two links: the directory itself and the subdir
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expectedNlink := uint64(2)
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if dirNlinkIncludesDot {
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expectedNlink++
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} else if runtime.GOOS == "windows" {
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expectedNlink = 1 // directory count is not returned.
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}
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require.Equal(t, expectedNlink, st.Nlink, runtime.GOOS)
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})
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// TODO: Investigate why Nlink increases on BSD when a file is added, but
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// not Linux.
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file := path.Join(tmpDir, "file")
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var stFile sys.Stat_t
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t.Run("file", func(t *testing.T) {
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require.NoError(t, os.WriteFile(file, nil, 0o400))
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stFile, errno = stat(file)
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require.EqualErrno(t, 0, errno)
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require.False(t, stFile.Mode.IsDir())
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require.NotEqual(t, uint64(0), st.Ino)
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})
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t.Run("link to file", func(t *testing.T) {
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link := path.Join(tmpDir, "file-link")
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require.NoError(t, os.Symlink(file, link))
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stLink, errno := stat(link)
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require.EqualErrno(t, 0, errno)
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require.Equal(t, stFile, stLink) // resolves to the file
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})
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t.Run("link to dir", func(t *testing.T) {
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link := path.Join(tmpDir, "dir-link")
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require.NoError(t, os.Symlink(subdir, link))
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stLink, errno := stat(link)
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require.EqualErrno(t, 0, errno)
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require.Equal(t, stSubdir, stLink) // resolves to the dir
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})
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}
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func TestStatFile(t *testing.T) {
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tmpDir := t.TempDir()
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tmpDirF := requireOpenFile(t, tmpDir, experimentalsys.O_RDONLY, 0)
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defer tmpDirF.Close()
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t.Run("dir", func(t *testing.T) {
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st, errno := tmpDirF.Stat()
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require.EqualErrno(t, 0, errno)
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requireDir(t, tmpDirF, st)
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requireDevIno(t, tmpDirF, st)
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})
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// Windows allows you to stat a closed dir because it is accessed by path,
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// not by file descriptor.
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if runtime.GOOS != "windows" {
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t.Run("closed dir", func(t *testing.T) {
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require.EqualErrno(t, 0, tmpDirF.Close())
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_, errno := tmpDirF.Stat()
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require.EqualErrno(t, experimentalsys.EBADF, errno)
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})
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}
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file := path.Join(tmpDir, "file")
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require.NoError(t, os.WriteFile(file, nil, 0o400))
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fileF := requireOpenFile(t, file, experimentalsys.O_RDONLY, 0)
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defer fileF.Close()
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t.Run("file", func(t *testing.T) {
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st, errno := fileF.Stat()
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require.EqualErrno(t, 0, errno)
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require.False(t, st.Mode.IsDir())
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require.NotEqual(t, uint64(0), st.Ino)
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})
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t.Run("closed fsFile", func(t *testing.T) {
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require.EqualErrno(t, 0, fileF.Close())
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_, errno := fileF.Stat()
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require.EqualErrno(t, experimentalsys.EBADF, errno)
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})
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subdir := path.Join(tmpDir, "sub")
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require.NoError(t, os.Mkdir(subdir, 0o500))
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subdirF := requireOpenFile(t, subdir, experimentalsys.O_RDONLY, 0)
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defer subdirF.Close()
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t.Run("subdir", func(t *testing.T) {
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st, errno := subdirF.Stat()
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require.EqualErrno(t, 0, errno)
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requireDir(t, subdirF, st)
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requireDevIno(t, subdirF, st)
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})
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if runtime.GOOS != "windows" { // windows allows you to stat a closed dir
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t.Run("closed subdir", func(t *testing.T) {
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require.EqualErrno(t, 0, subdirF.Close())
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_, errno := subdirF.Stat()
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require.EqualErrno(t, experimentalsys.EBADF, errno)
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})
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}
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}
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func Test_StatFile_times(t *testing.T) {
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tmpDir := t.TempDir()
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file := path.Join(tmpDir, "file")
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err := os.WriteFile(file, []byte{}, 0o700)
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require.NoError(t, err)
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type test struct {
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name string
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atimeNsec, mtimeNsec int64
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}
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// Note: This sets microsecond granularity because Windows doesn't support
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// nanosecond.
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tests := []test{
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{
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name: "positive",
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atimeNsec: time.Unix(123, 4*1e3).UnixNano(),
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mtimeNsec: time.Unix(567, 8*1e3).UnixNano(),
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},
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{name: "zero"},
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}
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// linux and freebsd report inaccurate results when the input ts is negative.
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if runtime.GOOS == "windows" || runtime.GOOS == "darwin" {
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tests = append(tests,
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test{
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name: "negative",
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atimeNsec: time.Unix(-123, -4*1e3).UnixNano(),
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mtimeNsec: time.Unix(-567, -8*1e3).UnixNano(),
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},
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)
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}
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for _, tt := range tests {
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tc := tt
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t.Run(tc.name, func(t *testing.T) {
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err := os.Chtimes(file, time.UnixMicro(tc.atimeNsec/1e3), time.UnixMicro(tc.mtimeNsec/1e3))
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require.NoError(t, err)
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f := requireOpenFile(t, file, experimentalsys.O_RDONLY, 0)
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defer f.Close()
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st, errno := f.Stat()
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require.EqualErrno(t, 0, errno)
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require.Equal(t, st.Atim, tc.atimeNsec)
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require.Equal(t, st.Mtim, tc.mtimeNsec)
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})
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}
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}
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func TestStatFile_dev_inode(t *testing.T) {
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tmpDir := t.TempDir()
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d := requireOpenFile(t, tmpDir, experimentalsys.O_RDONLY, 0)
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defer d.Close()
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path1 := path.Join(tmpDir, "1")
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f1 := requireOpenFile(t, path1, experimentalsys.O_CREAT, 0o666)
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defer f1.Close()
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path2 := path.Join(tmpDir, "2")
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f2 := requireOpenFile(t, path2, experimentalsys.O_CREAT, 0o666)
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defer f2.Close()
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pathLink2 := path.Join(tmpDir, "link2")
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err := os.Symlink(path2, pathLink2)
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require.NoError(t, err)
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l2 := requireOpenFile(t, pathLink2, experimentalsys.O_RDONLY, 0)
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defer l2.Close()
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// First, stat the directory
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st1, errno := d.Stat()
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require.EqualErrno(t, 0, errno)
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requireDir(t, d, st1)
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requireDevIno(t, d, st1)
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// Now, stat the files in it
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st1, errno = f1.Stat()
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require.EqualErrno(t, 0, errno)
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requireNotDir(t, f1, st1)
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requireDevIno(t, f1, st1)
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st2, errno := f2.Stat()
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require.EqualErrno(t, 0, errno)
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requireNotDir(t, f2, st2)
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requireDevIno(t, f2, st2)
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st3, errno := l2.Stat()
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require.EqualErrno(t, 0, errno)
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requireNotDir(t, l2, st3)
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requireDevIno(t, l2, st3)
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// The files should be on the same device, but different inodes
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require.Equal(t, st1.Dev, st2.Dev)
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require.NotEqual(t, st1.Ino, st2.Ino)
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require.Equal(t, st2, st3) // stat on a link is for its target
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// Redoing stat should result in the same inodes
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st1Again, errno := f1.Stat()
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require.EqualErrno(t, 0, errno)
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require.Equal(t, st1.Dev, st1Again.Dev)
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// On Windows, we cannot rename while opening.
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// So we manually close here before renaming.
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require.EqualErrno(t, 0, f1.Close())
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require.EqualErrno(t, 0, f2.Close())
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require.EqualErrno(t, 0, l2.Close())
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// Renaming a file shouldn't change its inodes.
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require.EqualErrno(t, 0, rename(path1, path2))
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f1 = requireOpenFile(t, path2, experimentalsys.O_RDONLY, 0)
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defer f1.Close()
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st1Again, errno = f1.Stat()
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require.EqualErrno(t, 0, errno)
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require.Equal(t, st1.Dev, st1Again.Dev)
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require.Equal(t, st1.Ino, st1Again.Ino)
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}
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func requireNotDir(t *testing.T, d experimentalsys.File, st sys.Stat_t) {
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// Verify cached state is correct
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isDir, errno := d.IsDir()
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require.EqualErrno(t, 0, errno)
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require.False(t, isDir)
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require.False(t, st.Mode.IsDir())
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}
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func requireDir(t *testing.T, d experimentalsys.File, st sys.Stat_t) {
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// Verify cached state is correct
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isDir, errno := d.IsDir()
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require.EqualErrno(t, 0, errno)
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require.True(t, isDir)
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require.True(t, st.Mode.IsDir())
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}
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func requireDevIno(t *testing.T, f experimentalsys.File, st sys.Stat_t) {
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// Results are inconsistent, so don't validate the opposite.
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if statSetsIno() {
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require.NotEqual(t, uint64(0), st.Dev)
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require.NotEqual(t, uint64(0), st.Ino)
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}
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// Verify the special-cased properties supporting wasip2 "is_same_object"
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// See https://github.com/WebAssembly/wasi-filesystem/pull/81
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dev, errno := f.Dev()
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require.EqualErrno(t, 0, errno)
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require.Equal(t, st.Dev, dev)
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ino, errno := f.Ino()
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require.EqualErrno(t, 0, errno)
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require.Equal(t, st.Ino, ino)
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}
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