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Add snapshot walk implementations

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Temporarily remove zfs and aufs until interface update

Signed-off-by: Derek McGowan <derek@mcgstyle.net>
This commit is contained in:
Derek McGowan
2019-10-16 16:42:05 -07:00
parent e8c14c07c6
commit 66aa1d3ef6
30 changed files with 261 additions and 2544 deletions
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201
vendor/github.com/mistifyio/go-zfs/LICENSE generated vendored
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@@ -1,201 +0,0 @@
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54
vendor/github.com/mistifyio/go-zfs/README.md generated vendored
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# Go Wrapper for ZFS #
Simple wrappers for ZFS command line tools.
[![GoDoc](https://godoc.org/github.com/mistifyio/go-zfs?status.svg)](https://godoc.org/github.com/mistifyio/go-zfs)
## Requirements ##
You need a working ZFS setup. To use on Ubuntu 14.04, setup ZFS:
sudo apt-get install python-software-properties
sudo apt-add-repository ppa:zfs-native/stable
sudo apt-get update
sudo apt-get install ubuntu-zfs libzfs-dev
Developed using Go 1.3, but currently there isn't anything 1.3 specific. Don't use Ubuntu packages for Go, use http://golang.org/doc/install
Generally you need root privileges to use anything zfs related.
## Status ##
This has been only been tested on Ubuntu 14.04
In the future, we hope to work directly with libzfs.
# Hacking #
The tests have decent examples for most functions.
```go
//assuming a zpool named test
//error handling omitted
f, err := zfs.CreateFilesystem("test/snapshot-test", nil)
ok(t, err)
s, err := f.Snapshot("test", nil)
ok(t, err)
// snapshot is named "test/snapshot-test@test"
c, err := s.Clone("test/clone-test", nil)
err := c.Destroy()
err := s.Destroy()
err := f.Destroy()
```
# Contributing #
See the [contributing guidelines](./CONTRIBUTING.md)

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vendor/github.com/mistifyio/go-zfs/error.go generated vendored
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package zfs
import (
"fmt"
)
// Error is an error which is returned when the `zfs` or `zpool` shell
// commands return with a non-zero exit code.
type Error struct {
Err error
Debug string
Stderr string
}
// Error returns the string representation of an Error.
func (e Error) Error() string {
return fmt.Sprintf("%s: %q => %s", e.Err, e.Debug, e.Stderr)
}

360
vendor/github.com/mistifyio/go-zfs/utils.go generated vendored
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package zfs
import (
"bytes"
"errors"
"fmt"
"io"
"os/exec"
"regexp"
"runtime"
"strconv"
"strings"
"github.com/google/uuid"
)
type command struct {
Command string
Stdin io.Reader
Stdout io.Writer
}
func (c *command) Run(arg ...string) ([][]string, error) {
cmd := exec.Command(c.Command, arg...)
var stdout, stderr bytes.Buffer
if c.Stdout == nil {
cmd.Stdout = &stdout
} else {
cmd.Stdout = c.Stdout
}
if c.Stdin != nil {
cmd.Stdin = c.Stdin
}
cmd.Stderr = &stderr
id := uuid.New().String()
joinedArgs := strings.Join(cmd.Args, " ")
logger.Log([]string{"ID:" + id, "START", joinedArgs})
err := cmd.Run()
logger.Log([]string{"ID:" + id, "FINISH"})
if err != nil {
return nil, &Error{
Err: err,
Debug: strings.Join([]string{cmd.Path, joinedArgs[1:]}, " "),
Stderr: stderr.String(),
}
}
// assume if you passed in something for stdout, that you know what to do with it
if c.Stdout != nil {
return nil, nil
}
lines := strings.Split(stdout.String(), "\n")
//last line is always blank
lines = lines[0 : len(lines)-1]
output := make([][]string, len(lines))
for i, l := range lines {
output[i] = strings.Fields(l)
}
return output, nil
}
func setString(field *string, value string) {
v := ""
if value != "-" {
v = value
}
*field = v
}
func setUint(field *uint64, value string) error {
var v uint64
if value != "-" {
var err error
v, err = strconv.ParseUint(value, 10, 64)
if err != nil {
return err
}
}
*field = v
return nil
}
func (ds *Dataset) parseLine(line []string) error {
var err error
if len(line) != len(dsPropList) {
return errors.New("Output does not match what is expected on this platform")
}
setString(&ds.Name, line[0])
setString(&ds.Origin, line[1])
if err = setUint(&ds.Used, line[2]); err != nil {
return err
}
if err = setUint(&ds.Avail, line[3]); err != nil {
return err
}
setString(&ds.Mountpoint, line[4])
setString(&ds.Compression, line[5])
setString(&ds.Type, line[6])
if err = setUint(&ds.Volsize, line[7]); err != nil {
return err
}
if err = setUint(&ds.Quota, line[8]); err != nil {
return err
}
if err = setUint(&ds.Referenced, line[9]); err != nil {
return err
}
if runtime.GOOS == "solaris" {
return nil
}
if err = setUint(&ds.Written, line[10]); err != nil {
return err
}
if err = setUint(&ds.Logicalused, line[11]); err != nil {
return err
}
if err = setUint(&ds.Usedbydataset, line[12]); err != nil {
return err
}
return nil
}
/*
* from zfs diff`s escape function:
*
* Prints a file name out a character at a time. If the character is
* not in the range of what we consider "printable" ASCII, display it
* as an escaped 3-digit octal value. ASCII values less than a space
* are all control characters and we declare the upper end as the
* DELete character. This also is the last 7-bit ASCII character.
* We choose to treat all 8-bit ASCII as not printable for this
* application.
*/
func unescapeFilepath(path string) (string, error) {
buf := make([]byte, 0, len(path))
llen := len(path)
for i := 0; i < llen; {
if path[i] == '\\' {
if llen < i+4 {
return "", fmt.Errorf("Invalid octal code: too short")
}
octalCode := path[(i + 1):(i + 4)]
val, err := strconv.ParseUint(octalCode, 8, 8)
if err != nil {
return "", fmt.Errorf("Invalid octal code: %v", err)
}
buf = append(buf, byte(val))
i += 4
} else {
buf = append(buf, path[i])
i++
}
}
return string(buf), nil
}
var changeTypeMap = map[string]ChangeType{
"-": Removed,
"+": Created,
"M": Modified,
"R": Renamed,
}
var inodeTypeMap = map[string]InodeType{
"B": BlockDevice,
"C": CharacterDevice,
"/": Directory,
">": Door,
"|": NamedPipe,
"@": SymbolicLink,
"P": EventPort,
"=": Socket,
"F": File,
}
// matches (+1) or (-1)
var referenceCountRegex = regexp.MustCompile("\\(([+-]\\d+?)\\)")
func parseReferenceCount(field string) (int, error) {
matches := referenceCountRegex.FindStringSubmatch(field)
if matches == nil {
return 0, fmt.Errorf("Regexp does not match")
}
return strconv.Atoi(matches[1])
}
func parseInodeChange(line []string) (*InodeChange, error) {
llen := len(line)
if llen < 1 {
return nil, fmt.Errorf("Empty line passed")
}
changeType := changeTypeMap[line[0]]
if changeType == 0 {
return nil, fmt.Errorf("Unknown change type '%s'", line[0])
}
switch changeType {
case Renamed:
if llen != 4 {
return nil, fmt.Errorf("Mismatching number of fields: expect 4, got: %d", llen)
}
case Modified:
if llen != 4 && llen != 3 {
return nil, fmt.Errorf("Mismatching number of fields: expect 3..4, got: %d", llen)
}
default:
if llen != 3 {
return nil, fmt.Errorf("Mismatching number of fields: expect 3, got: %d", llen)
}
}
inodeType := inodeTypeMap[line[1]]
if inodeType == 0 {
return nil, fmt.Errorf("Unknown inode type '%s'", line[1])
}
path, err := unescapeFilepath(line[2])
if err != nil {
return nil, fmt.Errorf("Failed to parse filename: %v", err)
}
var newPath string
var referenceCount int
switch changeType {
case Renamed:
newPath, err = unescapeFilepath(line[3])
if err != nil {
return nil, fmt.Errorf("Failed to parse filename: %v", err)
}
case Modified:
if llen == 4 {
referenceCount, err = parseReferenceCount(line[3])
if err != nil {
return nil, fmt.Errorf("Failed to parse reference count: %v", err)
}
}
default:
newPath = ""
}
return &InodeChange{
Change: changeType,
Type: inodeType,
Path: path,
NewPath: newPath,
ReferenceCountChange: referenceCount,
}, nil
}
// example input
//M / /testpool/bar/
//+ F /testpool/bar/hello.txt
//M / /testpool/bar/hello.txt (+1)
//M / /testpool/bar/hello-hardlink
func parseInodeChanges(lines [][]string) ([]*InodeChange, error) {
changes := make([]*InodeChange, len(lines))
for i, line := range lines {
c, err := parseInodeChange(line)
if err != nil {
return nil, fmt.Errorf("Failed to parse line %d of zfs diff: %v, got: '%s'", i, err, line)
}
changes[i] = c
}
return changes, nil
}
func listByType(t, filter string) ([]*Dataset, error) {
args := []string{"list", "-rHp", "-t", t, "-o", dsPropListOptions}
if filter != "" {
args = append(args, filter)
}
out, err := zfs(args...)
if err != nil {
return nil, err
}
var datasets []*Dataset
name := ""
var ds *Dataset
for _, line := range out {
if name != line[0] {
name = line[0]
ds = &Dataset{Name: name}
datasets = append(datasets, ds)
}
if err := ds.parseLine(line); err != nil {
return nil, err
}
}
return datasets, nil
}
func propsSlice(properties map[string]string) []string {
args := make([]string, 0, len(properties)*3)
for k, v := range properties {
args = append(args, "-o")
args = append(args, fmt.Sprintf("%s=%s", k, v))
}
return args
}
func (z *Zpool) parseLine(line []string) error {
prop := line[1]
val := line[2]
var err error
switch prop {
case "name":
setString(&z.Name, val)
case "health":
setString(&z.Health, val)
case "allocated":
err = setUint(&z.Allocated, val)
case "size":
err = setUint(&z.Size, val)
case "free":
err = setUint(&z.Free, val)
case "fragmentation":
// Trim trailing "%" before parsing uint
i := strings.Index(val, "%")
if i < 0 {
i = len(val)
}
err = setUint(&z.Fragmentation, val[:i])
case "readonly":
z.ReadOnly = val == "on"
case "freeing":
err = setUint(&z.Freeing, val)
case "leaked":
err = setUint(&z.Leaked, val)
case "dedupratio":
// Trim trailing "x" before parsing float64
z.DedupRatio, err = strconv.ParseFloat(val[:len(val)-1], 64)
}
return err
}

17
vendor/github.com/mistifyio/go-zfs/utils_notsolaris.go generated vendored
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// +build !solaris
package zfs
import (
"strings"
)
// List of ZFS properties to retrieve from zfs list command on a non-Solaris platform
var dsPropList = []string{"name", "origin", "used", "available", "mountpoint", "compression", "type", "volsize", "quota", "referenced", "written", "logicalused", "usedbydataset"}
var dsPropListOptions = strings.Join(dsPropList, ",")
// List of Zpool properties to retrieve from zpool list command on a non-Solaris platform
var zpoolPropList = []string{"name", "health", "allocated", "size", "free", "readonly", "dedupratio", "fragmentation", "freeing", "leaked"}
var zpoolPropListOptions = strings.Join(zpoolPropList, ",")
var zpoolArgs = []string{"get", "-p", zpoolPropListOptions}

17
vendor/github.com/mistifyio/go-zfs/utils_solaris.go generated vendored
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// +build solaris
package zfs
import (
"strings"
)
// List of ZFS properties to retrieve from zfs list command on a Solaris platform
var dsPropList = []string{"name", "origin", "used", "available", "mountpoint", "compression", "type", "volsize", "quota", "referenced"}
var dsPropListOptions = strings.Join(dsPropList, ",")
// List of Zpool properties to retrieve from zpool list command on a non-Solaris platform
var zpoolPropList = []string{"name", "health", "allocated", "size", "free", "readonly", "dedupratio"}
var zpoolPropListOptions = strings.Join(zpoolPropList, ",")
var zpoolArgs = []string{"get", "-p", zpoolPropListOptions}

452
vendor/github.com/mistifyio/go-zfs/zfs.go generated vendored
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// Package zfs provides wrappers around the ZFS command line tools.
package zfs
import (
"errors"
"fmt"
"io"
"strconv"
"strings"
)
// ZFS dataset types, which can indicate if a dataset is a filesystem,
// snapshot, or volume.
const (
DatasetFilesystem = "filesystem"
DatasetSnapshot = "snapshot"
DatasetVolume = "volume"
)
// Dataset is a ZFS dataset. A dataset could be a clone, filesystem, snapshot,
// or volume. The Type struct member can be used to determine a dataset's type.
//
// The field definitions can be found in the ZFS manual:
// http://www.freebsd.org/cgi/man.cgi?zfs(8).
type Dataset struct {
Name string
Origin string
Used uint64
Avail uint64
Mountpoint string
Compression string
Type string
Written uint64
Volsize uint64
Logicalused uint64
Usedbydataset uint64
Quota uint64
Referenced uint64
}
// InodeType is the type of inode as reported by Diff
type InodeType int
// Types of Inodes
const (
_ = iota // 0 == unknown type
BlockDevice InodeType = iota
CharacterDevice
Directory
Door
NamedPipe
SymbolicLink
EventPort
Socket
File
)
// ChangeType is the type of inode change as reported by Diff
type ChangeType int
// Types of Changes
const (
_ = iota // 0 == unknown type
Removed ChangeType = iota
Created
Modified
Renamed
)
// DestroyFlag is the options flag passed to Destroy
type DestroyFlag int
// Valid destroy options
const (
DestroyDefault DestroyFlag = 1 << iota
DestroyRecursive = 1 << iota
DestroyRecursiveClones = 1 << iota
DestroyDeferDeletion = 1 << iota
DestroyForceUmount = 1 << iota
)
// InodeChange represents a change as reported by Diff
type InodeChange struct {
Change ChangeType
Type InodeType
Path string
NewPath string
ReferenceCountChange int
}
// Logger can be used to log commands/actions
type Logger interface {
Log(cmd []string)
}
type defaultLogger struct{}
func (*defaultLogger) Log(cmd []string) {
return
}
var logger Logger = &defaultLogger{}
// SetLogger set a log handler to log all commands including arguments before
// they are executed
func SetLogger(l Logger) {
if l != nil {
logger = l
}
}
// zfs is a helper function to wrap typical calls to zfs.
func zfs(arg ...string) ([][]string, error) {
c := command{Command: "zfs"}
return c.Run(arg...)
}
// Datasets returns a slice of ZFS datasets, regardless of type.
// A filter argument may be passed to select a dataset with the matching name,
// or empty string ("") may be used to select all datasets.
func Datasets(filter string) ([]*Dataset, error) {
return listByType("all", filter)
}
// Snapshots returns a slice of ZFS snapshots.
// A filter argument may be passed to select a snapshot with the matching name,
// or empty string ("") may be used to select all snapshots.
func Snapshots(filter string) ([]*Dataset, error) {
return listByType(DatasetSnapshot, filter)
}
// Filesystems returns a slice of ZFS filesystems.
// A filter argument may be passed to select a filesystem with the matching name,
// or empty string ("") may be used to select all filesystems.
func Filesystems(filter string) ([]*Dataset, error) {
return listByType(DatasetFilesystem, filter)
}
// Volumes returns a slice of ZFS volumes.
// A filter argument may be passed to select a volume with the matching name,
// or empty string ("") may be used to select all volumes.
func Volumes(filter string) ([]*Dataset, error) {
return listByType(DatasetVolume, filter)
}
// GetDataset retrieves a single ZFS dataset by name. This dataset could be
// any valid ZFS dataset type, such as a clone, filesystem, snapshot, or volume.
func GetDataset(name string) (*Dataset, error) {
out, err := zfs("list", "-Hp", "-o", dsPropListOptions, name)
if err != nil {
return nil, err
}
ds := &Dataset{Name: name}
for _, line := range out {
if err := ds.parseLine(line); err != nil {
return nil, err
}
}
return ds, nil
}
// Clone clones a ZFS snapshot and returns a clone dataset.
// An error will be returned if the input dataset is not of snapshot type.
func (d *Dataset) Clone(dest string, properties map[string]string) (*Dataset, error) {
if d.Type != DatasetSnapshot {
return nil, errors.New("can only clone snapshots")
}
args := make([]string, 2, 4)
args[0] = "clone"
args[1] = "-p"
if properties != nil {
args = append(args, propsSlice(properties)...)
}
args = append(args, []string{d.Name, dest}...)
_, err := zfs(args...)
if err != nil {
return nil, err
}
return GetDataset(dest)
}
// Unmount unmounts currently mounted ZFS file systems.
func (d *Dataset) Unmount(force bool) (*Dataset, error) {
if d.Type == DatasetSnapshot {
return nil, errors.New("cannot unmount snapshots")
}
args := make([]string, 1, 3)
args[0] = "umount"
if force {
args = append(args, "-f")
}
args = append(args, d.Name)
_, err := zfs(args...)
if err != nil {
return nil, err
}
return GetDataset(d.Name)
}
// Mount mounts ZFS file systems.
func (d *Dataset) Mount(overlay bool, options []string) (*Dataset, error) {
if d.Type == DatasetSnapshot {
return nil, errors.New("cannot mount snapshots")
}
args := make([]string, 1, 5)
args[0] = "mount"
if overlay {
args = append(args, "-O")
}
if options != nil {
args = append(args, "-o")
args = append(args, strings.Join(options, ","))
}
args = append(args, d.Name)
_, err := zfs(args...)
if err != nil {
return nil, err
}
return GetDataset(d.Name)
}
// ReceiveSnapshot receives a ZFS stream from the input io.Reader, creates a
// new snapshot with the specified name, and streams the input data into the
// newly-created snapshot.
func ReceiveSnapshot(input io.Reader, name string) (*Dataset, error) {
c := command{Command: "zfs", Stdin: input}
_, err := c.Run("receive", name)
if err != nil {
return nil, err
}
return GetDataset(name)
}
// SendSnapshot sends a ZFS stream of a snapshot to the input io.Writer.
// An error will be returned if the input dataset is not of snapshot type.
func (d *Dataset) SendSnapshot(output io.Writer) error {
if d.Type != DatasetSnapshot {
return errors.New("can only send snapshots")
}
c := command{Command: "zfs", Stdout: output}
_, err := c.Run("send", d.Name)
return err
}
// CreateVolume creates a new ZFS volume with the specified name, size, and
// properties.
// A full list of available ZFS properties may be found here:
// https://www.freebsd.org/cgi/man.cgi?zfs(8).
func CreateVolume(name string, size uint64, properties map[string]string) (*Dataset, error) {
args := make([]string, 4, 5)
args[0] = "create"
args[1] = "-p"
args[2] = "-V"
args[3] = strconv.FormatUint(size, 10)
if properties != nil {
args = append(args, propsSlice(properties)...)
}
args = append(args, name)
_, err := zfs(args...)
if err != nil {
return nil, err
}
return GetDataset(name)
}
// Destroy destroys a ZFS dataset. If the destroy bit flag is set, any
// descendents of the dataset will be recursively destroyed, including snapshots.
// If the deferred bit flag is set, the snapshot is marked for deferred
// deletion.
func (d *Dataset) Destroy(flags DestroyFlag) error {
args := make([]string, 1, 3)
args[0] = "destroy"
if flags&DestroyRecursive != 0 {
args = append(args, "-r")
}
if flags&DestroyRecursiveClones != 0 {
args = append(args, "-R")
}
if flags&DestroyDeferDeletion != 0 {
args = append(args, "-d")
}
if flags&DestroyForceUmount != 0 {
args = append(args, "-f")
}
args = append(args, d.Name)
_, err := zfs(args...)
return err
}
// SetProperty sets a ZFS property on the receiving dataset.
// A full list of available ZFS properties may be found here:
// https://www.freebsd.org/cgi/man.cgi?zfs(8).
func (d *Dataset) SetProperty(key, val string) error {
prop := strings.Join([]string{key, val}, "=")
_, err := zfs("set", prop, d.Name)
return err
}
// GetProperty returns the current value of a ZFS property from the
// receiving dataset.
// A full list of available ZFS properties may be found here:
// https://www.freebsd.org/cgi/man.cgi?zfs(8).
func (d *Dataset) GetProperty(key string) (string, error) {
out, err := zfs("get", "-H", key, d.Name)
if err != nil {
return "", err
}
return out[0][2], nil
}
// Rename renames a dataset.
func (d *Dataset) Rename(name string, createParent bool, recursiveRenameSnapshots bool) (*Dataset, error) {
args := make([]string, 3, 5)
args[0] = "rename"
args[1] = d.Name
args[2] = name
if createParent {
args = append(args, "-p")
}
if recursiveRenameSnapshots {
args = append(args, "-r")
}
_, err := zfs(args...)
if err != nil {
return d, err
}
return GetDataset(name)
}
// Snapshots returns a slice of all ZFS snapshots of a given dataset.
func (d *Dataset) Snapshots() ([]*Dataset, error) {
return Snapshots(d.Name)
}
// CreateFilesystem creates a new ZFS filesystem with the specified name and
// properties.
// A full list of available ZFS properties may be found here:
// https://www.freebsd.org/cgi/man.cgi?zfs(8).
func CreateFilesystem(name string, properties map[string]string) (*Dataset, error) {
args := make([]string, 1, 4)
args[0] = "create"
if properties != nil {
args = append(args, propsSlice(properties)...)
}
args = append(args, name)
_, err := zfs(args...)
if err != nil {
return nil, err
}
return GetDataset(name)
}
// Snapshot creates a new ZFS snapshot of the receiving dataset, using the
// specified name. Optionally, the snapshot can be taken recursively, creating
// snapshots of all descendent filesystems in a single, atomic operation.
func (d *Dataset) Snapshot(name string, recursive bool) (*Dataset, error) {
args := make([]string, 1, 4)
args[0] = "snapshot"
if recursive {
args = append(args, "-r")
}
snapName := fmt.Sprintf("%s@%s", d.Name, name)
args = append(args, snapName)
_, err := zfs(args...)
if err != nil {
return nil, err
}
return GetDataset(snapName)
}
// Rollback rolls back the receiving ZFS dataset to a previous snapshot.
// Optionally, intermediate snapshots can be destroyed. A ZFS snapshot
// rollback cannot be completed without this option, if more recent
// snapshots exist.
// An error will be returned if the input dataset is not of snapshot type.
func (d *Dataset) Rollback(destroyMoreRecent bool) error {
if d.Type != DatasetSnapshot {
return errors.New("can only rollback snapshots")
}
args := make([]string, 1, 3)
args[0] = "rollback"
if destroyMoreRecent {
args = append(args, "-r")
}
args = append(args, d.Name)
_, err := zfs(args...)
return err
}
// Children returns a slice of children of the receiving ZFS dataset.
// A recursion depth may be specified, or a depth of 0 allows unlimited
// recursion.
func (d *Dataset) Children(depth uint64) ([]*Dataset, error) {
args := []string{"list"}
if depth > 0 {
args = append(args, "-d")
args = append(args, strconv.FormatUint(depth, 10))
} else {
args = append(args, "-r")
}
args = append(args, "-t", "all", "-Hp", "-o", dsPropListOptions)
args = append(args, d.Name)
out, err := zfs(args...)
if err != nil {
return nil, err
}
var datasets []*Dataset
name := ""
var ds *Dataset
for _, line := range out {
if name != line[0] {
name = line[0]
ds = &Dataset{Name: name}
datasets = append(datasets, ds)
}
if err := ds.parseLine(line); err != nil {
return nil, err
}
}
return datasets[1:], nil
}
// Diff returns changes between a snapshot and the given ZFS dataset.
// The snapshot name must include the filesystem part as it is possible to
// compare clones with their origin snapshots.
func (d *Dataset) Diff(snapshot string) ([]*InodeChange, error) {
args := []string{"diff", "-FH", snapshot, d.Name}[:]
out, err := zfs(args...)
if err != nil {
return nil, err
}
inodeChanges, err := parseInodeChanges(out)
if err != nil {
return nil, err
}
return inodeChanges, nil
}

112
vendor/github.com/mistifyio/go-zfs/zpool.go generated vendored
View File

@@ -1,112 +0,0 @@
package zfs
// ZFS zpool states, which can indicate if a pool is online, offline,
// degraded, etc. More information regarding zpool states can be found here:
// https://docs.oracle.com/cd/E19253-01/819-5461/gamno/index.html.
const (
ZpoolOnline = "ONLINE"
ZpoolDegraded = "DEGRADED"
ZpoolFaulted = "FAULTED"
ZpoolOffline = "OFFLINE"
ZpoolUnavail = "UNAVAIL"
ZpoolRemoved = "REMOVED"
)
// Zpool is a ZFS zpool. A pool is a top-level structure in ZFS, and can
// contain many descendent datasets.
type Zpool struct {
Name string
Health string
Allocated uint64
Size uint64
Free uint64
Fragmentation uint64
ReadOnly bool
Freeing uint64
Leaked uint64
DedupRatio float64
}
// zpool is a helper function to wrap typical calls to zpool.
func zpool(arg ...string) ([][]string, error) {
c := command{Command: "zpool"}
return c.Run(arg...)
}
// GetZpool retrieves a single ZFS zpool by name.
func GetZpool(name string) (*Zpool, error) {
args := zpoolArgs
args = append(args, name)
out, err := zpool(args...)
if err != nil {
return nil, err
}
// there is no -H
out = out[1:]
z := &Zpool{Name: name}
for _, line := range out {
if err := z.parseLine(line); err != nil {
return nil, err
}
}
return z, nil
}
// Datasets returns a slice of all ZFS datasets in a zpool.
func (z *Zpool) Datasets() ([]*Dataset, error) {
return Datasets(z.Name)
}
// Snapshots returns a slice of all ZFS snapshots in a zpool.
func (z *Zpool) Snapshots() ([]*Dataset, error) {
return Snapshots(z.Name)
}
// CreateZpool creates a new ZFS zpool with the specified name, properties,
// and optional arguments.
// A full list of available ZFS properties and command-line arguments may be
// found here: https://www.freebsd.org/cgi/man.cgi?zfs(8).
func CreateZpool(name string, properties map[string]string, args ...string) (*Zpool, error) {
cli := make([]string, 1, 4)
cli[0] = "create"
if properties != nil {
cli = append(cli, propsSlice(properties)...)
}
cli = append(cli, name)
cli = append(cli, args...)
_, err := zpool(cli...)
if err != nil {
return nil, err
}
return &Zpool{Name: name}, nil
}
// Destroy destroys a ZFS zpool by name.
func (z *Zpool) Destroy() error {
_, err := zpool("destroy", z.Name)
return err
}
// ListZpools list all ZFS zpools accessible on the current system.
func ListZpools() ([]*Zpool, error) {
args := []string{"list", "-Ho", "name"}
out, err := zpool(args...)
if err != nil {
return nil, err
}
var pools []*Zpool
for _, line := range out {
z, err := GetZpool(line[0])
if err != nil {
return nil, err
}
pools = append(pools, z)
}
return pools, nil
}