Sketched invokeMountSample.
parent
9ae1064493
commit
5001868f24
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@ -15,9 +15,16 @@
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package samples
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import (
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"fmt"
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"io"
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"io/ioutil"
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"log"
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"os/exec"
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"strings"
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"time"
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"github.com/jacobsa/fuse"
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"github.com/jacobsa/bazilfuse"
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"github.com/jacobsa/ogletest"
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"golang.org/x/net/context"
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)
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@ -42,5 +49,110 @@ type SubprocessTest struct {
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// fail if closing fails.
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ToClose []io.Closer
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mfs *fuse.MountedFileSystem
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mountCmd *exec.Cmd
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}
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// Mount the file system and initialize the other exported fields of the
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// struct. Panics on error.
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//
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// REQUIRES: t.FileSystem has been set.
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func (t *SubprocessTest) SetUp(ti *ogletest.TestInfo) {
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err := t.initialize()
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if err != nil {
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panic(err)
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}
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}
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// Build the mount_sample tool if it has not yet been built for this process.
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// Return a path to the binary.
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func buildMountSample() (path string, err error)
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// Invoke mount_sample, returning a running command.
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func invokeMountSample(path string, args []string) (cmd *exec.Cmd, err error)
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// Like SetUp, but doens't panic.
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func (t *SubprocessTest) initialize() (err error) {
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// Initialize the context.
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t.Ctx = context.Background()
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// Set up a temporary directory.
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t.Dir, err = ioutil.TempDir("", "sample_test")
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if err != nil {
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err = fmt.Errorf("TempDir: %v", err)
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return
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}
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// Build the mount_sample tool.
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toolPath, err := buildMountSample()
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if err != nil {
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err = fmt.Errorf("buildMountSample: %v", err)
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return
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}
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// Invoke it.
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args := []string{"--type", t.MountType}
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args = append(args, t.MountFlags...)
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t.mountCmd, err = invokeMountSample(toolPath, args)
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if err != nil {
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err = fmt.Errorf("invokeMountSample: %v", err)
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return
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}
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// TODO(jacobsa): Probably need some sort of signalling (on stderr? write to
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// a flag-controlled file?) when WaitForReady has returned.
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return
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}
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// Unmount the file system and clean up. Panics on error.
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func (t *SubprocessTest) TearDown() {
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err := t.destroy()
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if err != nil {
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panic(err)
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}
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}
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// Like TearDown, but doesn't panic.
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func (t *SubprocessTest) destroy() (err error) {
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// Close what is necessary.
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for _, c := range t.ToClose {
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if c == nil {
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continue
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}
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ogletest.ExpectEq(nil, c.Close())
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}
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// Was the file system mounted?
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if t.mountCmd == nil {
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return
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}
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// Unmount the file system. Try again on "resource busy" errors.
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delay := 10 * time.Millisecond
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for {
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err = bazilfuse.Unmount(t.Dir)
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if err == nil {
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break
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}
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if strings.Contains(err.Error(), "resource busy") {
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log.Println("Resource busy error while unmounting; trying again")
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time.Sleep(delay)
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delay = time.Duration(1.3 * float64(delay))
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continue
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}
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err = fmt.Errorf("Unmount: %v", err)
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return
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}
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// Wait for the subprocess.
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if err = t.mountCmd.Wait(); err != nil {
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err = fmt.Errorf("Cmd.Wait: %v", err)
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return
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}
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return
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}
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