Return better errors from Mount, instead of dumping them to stderr.
For googlecloudplatform/gcsfuse#161.geesefs-0-30-9
commit
652a72aae2
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@ -1,37 +1,14 @@
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package fuse
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import (
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"bufio"
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"bytes"
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"fmt"
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"io"
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"log"
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"net"
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"os"
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"os/exec"
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"sync"
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"syscall"
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)
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func lineLogger(wg *sync.WaitGroup, prefix string, r io.ReadCloser) {
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defer wg.Done()
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scanner := bufio.NewScanner(r)
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for scanner.Scan() {
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switch line := scanner.Text(); line {
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case `fusermount: failed to open /etc/fuse.conf: Permission denied`:
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// Silence this particular message, it occurs way too
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// commonly and isn't very relevant to whether the mount
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// succeeds or not.
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continue
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default:
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log.Printf("%s: %s", prefix, line)
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}
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}
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if err := scanner.Err(); err != nil {
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log.Printf("%s, error reading: %v", prefix, err)
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}
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}
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// Begin the process of mounting at the given directory, returning a connection
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// to the kernel. Mounting continues in the background, and is complete when an
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// error is written to the supplied channel. The file system may need to
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@ -57,7 +34,9 @@ func mount(
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readFile := os.NewFile(uintptr(fds[1]), "fusermount-parent-reads")
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defer readFile.Close()
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// Start fusermount, passing it pipes for stdout and stderr.
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// Start fusermount, passing it a buffer in which to write stderr.
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var stderr bytes.Buffer
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cmd := exec.Command(
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"fusermount",
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"-o", cfg.toOptionsString(),
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@ -67,36 +46,12 @@ func mount(
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cmd.Env = append(os.Environ(), "_FUSE_COMMFD=3")
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cmd.ExtraFiles = []*os.File{writeFile}
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cmd.Stderr = &stderr
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stdout, err := cmd.StdoutPipe()
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// Run the command.
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err = cmd.Run()
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if err != nil {
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err = fmt.Errorf("StdoutPipe: %v", err)
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return
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}
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stderr, err := cmd.StderrPipe()
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if err != nil {
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err = fmt.Errorf("StderrPipe: %v", err)
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return
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}
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err = cmd.Start()
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if err != nil {
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err = fmt.Errorf("Starting fusermount: %v", err)
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return
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}
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// Log fusermount output until it closes stdout and stderr.
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var wg sync.WaitGroup
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wg.Add(2)
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go lineLogger(&wg, "mount helper output", stdout)
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go lineLogger(&wg, "mount helper error", stderr)
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wg.Wait()
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// Wait for the command.
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err = cmd.Wait()
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if err != nil {
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err = fmt.Errorf("fusermount: %v", err)
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err = fmt.Errorf("running fusermount: %v\n\nstderr:\n%s", err, stderr.Bytes())
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return
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}
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@ -0,0 +1,142 @@
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package fuse_test
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import (
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"io/ioutil"
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"os"
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"path"
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"runtime"
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"strings"
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"testing"
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"golang.org/x/net/context"
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"github.com/jacobsa/fuse"
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"github.com/jacobsa/fuse/fuseops"
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"github.com/jacobsa/fuse/fuseutil"
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)
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////////////////////////////////////////////////////////////////////////
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// minimalFS
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////////////////////////////////////////////////////////////////////////
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// A minimal fuseutil.FileSystem that can successfully mount but do nothing
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// else.
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type minimalFS struct {
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fuseutil.NotImplementedFileSystem
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}
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func (fs *minimalFS) StatFS(
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ctx context.Context,
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op *fuseops.StatFSOp) (err error) {
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return
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}
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////////////////////////////////////////////////////////////////////////
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// Tests
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////////////////////////////////////////////////////////////////////////
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func TestSuccessfulMount(t *testing.T) {
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ctx := context.Background()
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// Set up a temporary directory.
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dir, err := ioutil.TempDir("", "mount_test")
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if err != nil {
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t.Fatal("ioutil.TempDir: %v", err)
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}
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defer os.RemoveAll(dir)
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// Mount.
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fs := &minimalFS{}
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mfs, err := fuse.Mount(
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dir,
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fuseutil.NewFileSystemServer(fs),
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&fuse.MountConfig{})
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if err != nil {
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t.Fatalf("fuse.Mount: %v", err)
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}
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defer func() {
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if err := mfs.Join(ctx); err != nil {
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t.Errorf("Joining: %v", err)
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}
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}()
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defer fuse.Unmount(mfs.Dir())
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}
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func TestNonEmptyMountPoint(t *testing.T) {
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ctx := context.Background()
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// osxfuse appears to be happy to mount over a non-empty mount point.
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//
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// We leave this test in for Linux, because it tickles the behavior of
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// fusermount writing to stderr and exiting with an error code. We want to
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// make sure that a descriptive error makes it back to the user.
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if runtime.GOOS == "darwin" {
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return
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}
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// Set up a temporary directory.
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dir, err := ioutil.TempDir("", "mount_test")
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if err != nil {
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t.Fatal("ioutil.TempDir: %v", err)
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}
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defer os.RemoveAll(dir)
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// Add a file within it.
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err = ioutil.WriteFile(path.Join(dir, "foo"), []byte{}, 0600)
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if err != nil {
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t.Fatalf("ioutil.WriteFile: %v", err)
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}
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// Attempt to mount.
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fs := &minimalFS{}
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mfs, err := fuse.Mount(
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dir,
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fuseutil.NewFileSystemServer(fs),
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&fuse.MountConfig{})
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if err == nil {
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fuse.Unmount(mfs.Dir())
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mfs.Join(ctx)
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t.Fatal("fuse.Mount returned nil")
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}
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const want = "not empty"
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if got := err.Error(); !strings.Contains(got, want) {
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t.Errorf("Unexpected error: %v", got)
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}
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}
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func TestNonexistentMountPoint(t *testing.T) {
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ctx := context.Background()
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// Set up a temporary directory.
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dir, err := ioutil.TempDir("", "mount_test")
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if err != nil {
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t.Fatal("ioutil.TempDir: %v", err)
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}
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defer os.RemoveAll(dir)
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// Attempt to mount into a sub-directory that doesn't exist.
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fs := &minimalFS{}
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mfs, err := fuse.Mount(
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path.Join(dir, "foo"),
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fuseutil.NewFileSystemServer(fs),
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&fuse.MountConfig{})
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if err == nil {
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fuse.Unmount(mfs.Dir())
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mfs.Join(ctx)
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t.Fatal("fuse.Mount returned nil")
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}
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const want = "no such file"
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if got := err.Error(); !strings.Contains(got, want) {
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t.Errorf("Unexpected error: %v", got)
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}
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}
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