Golang go-zfs.CreateFilesystem函數代碼示例

func TestRollback(t *testing.T) {
	zpoolTest(t, func() {
		f, err := zfs.CreateFilesystem("test/snapshot-test", nil)
		ok(t, err)

		filesystems, err := zfs.Filesystems("")
		ok(t, err)

		for _, filesystem := range filesystems {
			equals(t, zfs.DatasetFilesystem, filesystem.Type)
		}

		s1, err := f.Snapshot("test", false)
		ok(t, err)

		_, err = f.Snapshot("test2", false)
		ok(t, err)

		s3, err := f.Snapshot("test3", false)
		ok(t, err)

		err = s3.Rollback(false)
		ok(t, err)

		err = s1.Rollback(false)
		assert(t, err != nil, "should error when rolling back beyond most recent without destroyMoreRecent = true")

		err = s1.Rollback(true)
		ok(t, err)

		ok(t, s1.Destroy(zfs.DestroyDefault))

		ok(t, f.Destroy(zfs.DestroyDefault))
	})
}

func (d *Driver) create(id, parent string, storageOpt map[string]string) error {
	name := d.zfsPath(id)
	quota, err := parseStorageOpt(storageOpt)
	if err != nil {
		return err
	}
	if parent == "" {
		mountoptions := map[string]string{"mountpoint": "legacy"}
		fs, err := zfs.CreateFilesystem(name, mountoptions)
		if err == nil {
			err = setQuota(name, quota)
			if err == nil {
				d.Lock()
				d.filesystemsCache[fs.Name] = true
				d.Unlock()
			}
		}
		return err
	}
	err = d.cloneFilesystem(name, d.zfsPath(parent))
	if err == nil {
		err = setQuota(name, quota)
	}
	return err
}

func TestSendSnapshot(t *testing.T) {
	zpoolTest(t, func() {
		f, err := zfs.CreateFilesystem("test/snapshot-test", nil)
		ok(t, err)

		filesystems, err := zfs.Filesystems("")
		ok(t, err)

		for _, filesystem := range filesystems {
			equals(t, zfs.DatasetFilesystem, filesystem.Type)
		}

		s, err := f.Snapshot("test", false)
		ok(t, err)

		file, _ := ioutil.TempFile("/tmp/", "zfs-")
		defer file.Close()
		err = file.Truncate(pow2(30))
		ok(t, err)
		defer os.Remove(file.Name())

		err = s.SendSnapshot(file)
		ok(t, err)

		ok(t, s.Destroy(zfs.DestroyDefault))

		ok(t, f.Destroy(zfs.DestroyDefault))
	})
}

func TestClone(t *testing.T) {
	zpoolTest(t, func() {
		f, err := zfs.CreateFilesystem("test/snapshot-test", nil)
		ok(t, err)

		filesystems, err := zfs.Filesystems("")
		ok(t, err)

		for _, filesystem := range filesystems {
			equals(t, zfs.DatasetFilesystem, filesystem.Type)
		}

		s, err := f.Snapshot("test", false)
		ok(t, err)

		equals(t, zfs.DatasetSnapshot, s.Type)
		equals(t, "test/[email protected]", s.Name)

		c, err := s.Clone("test/clone-test", nil)
		ok(t, err)

		equals(t, zfs.DatasetFilesystem, c.Type)

		ok(t, c.Destroy(zfs.DestroyDefault))

		ok(t, s.Destroy(zfs.DestroyDefault))

		ok(t, f.Destroy(zfs.DestroyDefault))
	})
}

func (ZpoolTests) TestOrphanedZpoolFileAdoption(c *C) {
	dataset := "testpool-bananagram"

	backingFilePath := fmt.Sprintf("/tmp/zfs-%s", random.String(12))
	defer os.Remove(backingFilePath)

	provider, err := NewProvider(&ProviderConfig{
		DatasetName: dataset,
		Make: &MakeDev{
			BackingFilename: backingFilePath,
			Size:            one_gig,
		},
	})
	defer func() {
		pool, _ := gzfs.GetZpool(dataset)
		if pool != nil {
			pool.Destroy()
		}
	}()
	c.Assert(err, IsNil)
	c.Assert(provider, NotNil)

	// add a dataset to this zpool, so we can check for it on the flip side
	markerDatasetName := path.Join(dataset, "testfs")
	_, err = gzfs.CreateFilesystem(markerDatasetName, nil)
	c.Assert(err, IsNil)

	// do a 'zpool export'
	// this roughly approximates what we see after a host reboot
	// (though host reboots may leave it in an even more unclean state than this)
	err = exec.Command("zpool", "export", "-f", dataset).Run()
	c.Assert(err, IsNil)

	// sanity check that our test is doing the right thing: zpool forgot about these
	_, err = gzfs.GetDataset(dataset)
	c.Assert(err, NotNil)
	_, err = gzfs.GetDataset(markerDatasetName)
	c.Assert(err, NotNil)

	// if we create another provider with the same file vdev path, it should
	// pick up that file again without wrecking the dataset
	provider, err = NewProvider(&ProviderConfig{
		DatasetName: dataset,
		Make: &MakeDev{
			BackingFilename: backingFilePath,
			Size:            one_gig,
		},
	})
	c.Assert(err, IsNil)
	c.Assert(provider, NotNil)
	_, err = gzfs.GetDataset(markerDatasetName)
	c.Assert(err, IsNil)
}

func TestDiff(t *testing.T) {
	zpoolTest(t, func() {
		fs, err := zfs.CreateFilesystem("test/origin", nil)
		ok(t, err)

		linkedFile, err := os.Create(filepath.Join(fs.Mountpoint, "linked"))
		ok(t, err)

		movedFile, err := os.Create(filepath.Join(fs.Mountpoint, "file"))
		ok(t, err)

		snapshot, err := fs.Snapshot("snapshot", false)
		ok(t, err)

		unicodeFile, err := os.Create(filepath.Join(fs.Mountpoint, "i ❤ unicode"))
		ok(t, err)

		err = os.Rename(movedFile.Name(), movedFile.Name()+"-new")
		ok(t, err)

		err = os.Link(linkedFile.Name(), linkedFile.Name()+"_hard")
		ok(t, err)

		inodeChanges, err := fs.Diff(snapshot.Name)
		ok(t, err)
		equals(t, 4, len(inodeChanges))

		equals(t, "/test/origin/", inodeChanges[0].Path)
		equals(t, zfs.Directory, inodeChanges[0].Type)
		equals(t, zfs.Modified, inodeChanges[0].Change)

		equals(t, "/test/origin/linked", inodeChanges[1].Path)
		equals(t, zfs.File, inodeChanges[1].Type)
		equals(t, zfs.Modified, inodeChanges[1].Change)
		equals(t, 1, inodeChanges[1].ReferenceCountChange)

		equals(t, "/test/origin/file", inodeChanges[2].Path)
		equals(t, "/test/origin/file-new", inodeChanges[2].NewPath)
		equals(t, zfs.File, inodeChanges[2].Type)
		equals(t, zfs.Renamed, inodeChanges[2].Change)

		equals(t, "/test/origin/i ❤ unicode", inodeChanges[3].Path)
		equals(t, zfs.File, inodeChanges[3].Type)
		equals(t, zfs.Created, inodeChanges[3].Change)

		ok(t, movedFile.Close())
		ok(t, unicodeFile.Close())
		ok(t, linkedFile.Close())
		ok(t, snapshot.Destroy(zfs.DestroyForceUmount))
		ok(t, fs.Destroy(zfs.DestroyForceUmount))
	})
}

func (d *Driver) create(id, parent string) error {
	name := d.ZfsPath(id)
	if parent == "" {
		mountoptions := map[string]string{"mountpoint": "legacy"}
		fs, err := zfs.CreateFilesystem(name, mountoptions)
		if err == nil {
			d.Lock()
			d.filesystemsCache[fs.Name] = true
			d.Unlock()
		}
		return err
	}
	return d.cloneFilesystem(name, d.ZfsPath(parent))
}

func TestFilesystems(t *testing.T) {
	zpoolTest(t, func() {
		f, err := zfs.CreateFilesystem("test/filesystem-test", nil)
		ok(t, err)

		filesystems, err := zfs.Filesystems("")
		ok(t, err)

		for _, filesystem := range filesystems {
			equals(t, zfs.DatasetFilesystem, filesystem.Type)
		}

		ok(t, f.Destroy(zfs.DestroyDefault))
	})
}

func (p *Provider) NewVolume() (volume.Volume, error) {
	id := random.UUID()
	v := &zfsVolume{
		info:      &volume.Info{ID: id},
		provider:  p,
		basemount: p.mountPath(id),
	}
	var err error
	v.dataset, err = zfs.CreateFilesystem(path.Join(v.provider.dataset.Name, id), map[string]string{
		"mountpoint": v.basemount,
	})
	if err != nil {
		return nil, err
	}
	p.volumes[id] = v
	return v, nil
}

func TestChildren(t *testing.T) {
	zpoolTest(t, func() {
		f, err := zfs.CreateFilesystem("test/snapshot-test", nil)
		ok(t, err)

		s, err := f.Snapshot("test", false)
		ok(t, err)

		equals(t, zfs.DatasetSnapshot, s.Type)
		equals(t, "test/[email protected]", s.Name)

		children, err := f.Children(0)
		ok(t, err)

		equals(t, 1, len(children))
		equals(t, "test/[email protected]", children[0].Name)

		ok(t, s.Destroy(zfs.DestroyDefault))
		ok(t, f.Destroy(zfs.DestroyDefault))
	})
}

func TestCreateFilesystemWithProperties(t *testing.T) {
	zpoolTest(t, func() {
		props := map[string]string{
			"compression": "lz4",
		}

		f, err := zfs.CreateFilesystem("test/filesystem-test", props)
		ok(t, err)

		equals(t, "lz4", f.Compression)

		filesystems, err := zfs.Filesystems("")
		ok(t, err)

		for _, filesystem := range filesystems {
			equals(t, zfs.DatasetFilesystem, filesystem.Type)
		}

		ok(t, f.Destroy(zfs.DestroyDefault))
	})
}

func (p *Provider) NewVolume() (volume.Volume, error) {
	id := random.UUID()
	info := &volume.Info{
		ID:        id,
		Type:      volume.VolumeTypeData,
		CreatedAt: time.Now(),
	}
	v := &zfsVolume{
		info:      info,
		provider:  p,
		basemount: p.mountPath(info),
	}
	var err error
	v.dataset, err = zfs.CreateFilesystem(p.datasetPath(info), map[string]string{
		"mountpoint": v.basemount,
	})
	if err != nil {
		return nil, err
	}
	p.volumes[id] = v
	return v, nil
}

func NewProvider(config *ProviderConfig) (volume.Provider, error) {
	if _, err := exec.LookPath("zfs"); err != nil {
		return nil, fmt.Errorf("zfs command is not available")
	}
	dataset, err := zfs.GetDataset(config.DatasetName)
	if err != nil {
		if isDatasetNotExistsError(err) {
			// if the dataset doesn't exist...
			if config.Make == nil {
				// not much we can do without a dataset or pool to contain data
				return nil, err
			}
			// make a zpool backed by a sparse file.  it's the most portable thing we can do.
			if err := os.MkdirAll(filepath.Dir(config.Make.BackingFilename), 0755); err != nil {
				return nil, err
			}
			f, err := os.OpenFile(config.Make.BackingFilename, os.O_CREATE|os.O_EXCL|os.O_WRONLY, 0600)
			if err == nil {
				// if we've created a new file, size it and create a new zpool
				if err = f.Truncate(config.Make.Size); err != nil {
					return nil, err
				}
				f.Close()
				if _, err = zfs.CreateZpool(
					config.DatasetName,
					nil,
					"-mnone", // do not mount the root dataset.  (we'll mount our own datasets as necessary.)
					config.Make.BackingFilename,
				); err != nil {
					return nil, err
				}
			} else if err.(*os.PathError).Err == syscall.EEXIST {
				// if the file already exists, check it for existing zpool
				if err := zpoolImportFile(config.Make.BackingFilename); err != nil {
					// if 'zpool import' didn't believe it... halt here
					// we could overwrite but we'd rather stop and avoid potential data loss.
					return nil, fmt.Errorf("error attempting import of existing zpool file: %s", err)
				}
				// note: 'zpool import' recreated *all* the volume datasets in that pool.
				// currently, even if they're not known to a volume manager, they're not garbage collected.
			} else {
				return nil, err
			}
			// get the dataset again... `zfs.Zpool` isn't a `zfs.Dataset`
			dataset, err = zfs.GetDataset(config.DatasetName)
			if err != nil {
				return nil, err
			}
		} else {
			// any error more complicated than not_exists, and we're out of our depth
			return nil, err
		}
	}
	if config.WorkingDir == "" {
		config.WorkingDir = "/var/lib/flynn/volumes/zfs/"
	}
	for _, typ := range volume.VolumeTypes {
		if err := os.MkdirAll(filepath.Join(config.WorkingDir, "mnt", string(typ)), 0755); err != nil {
			return nil, err
		}
		dataset := filepath.Join(config.DatasetName, string(typ))
		if _, err := zfs.GetDataset(dataset); err != nil {
			if _, err := zfs.CreateFilesystem(dataset, nil); err != nil {
				return nil, err
			}
		}
	}
	return &Provider{
		config:  config,
		dataset: dataset,
		volumes: make(map[string]*zfsVolume),
	}, nil
}