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