forked from canonical/lxd
/
list.go
667 lines (542 loc) · 16.2 KB
/
list.go
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package main
import (
"encoding/csv"
"encoding/json"
"fmt"
"os"
"regexp"
"sort"
"strconv"
"strings"
"sync"
"github.com/olekukonko/tablewriter"
"gopkg.in/yaml.v2"
"github.com/lxc/lxd"
"github.com/lxc/lxd/shared"
"github.com/lxc/lxd/shared/api"
"github.com/lxc/lxd/shared/gnuflag"
"github.com/lxc/lxd/shared/i18n"
)
type column struct {
Name string
Data columnData
NeedsState bool
NeedsSnapshots bool
}
type columnData func(api.Container, *api.ContainerState, []api.ContainerSnapshot) string
type listCmd struct {
columnsRaw string
fast bool
format string
}
func (c *listCmd) showByDefault() bool {
return true
}
func (c *listCmd) usage() string {
return i18n.G(
`Usage: lxc list [<remote>:] [filters] [--format csv|json|table|yaml] [-c <columns>] [--fast]
List the existing containers.
Default column layout: ns46tS
Fast column layout: nsacPt
*Filters*
A single keyword like "web" which will list any container with a name starting by "web".
A regular expression on the container name. (e.g. .*web.*01$).
A key/value pair referring to a configuration item. For those, the namespace can be abbreviated to the smallest unambiguous identifier.
- "user.blah=abc" will list all containers with the "blah" user property set to "abc".
- "u.blah=abc" will do the same
- "security.privileged=1" will list all privileged containers
- "s.privileged=1" will do the same
A regular expression matching a configuration item or its value. (e.g. volatile.eth0.hwaddr=00:16:3e:.*).
*Columns*
The -c option takes a comma separated list of arguments that control
which container attributes to output when displaying in table or csv
format.
Column arguments are either pre-defined shorthand chars (see below),
or (extended) config keys.
Commas between consecutive shorthand chars are optional.
Pre-defined column shorthand chars:
4 - IPv4 address
6 - IPv6 address
a - Architecture
b - Storage pool
c - Creation date
d - Description
l - Last used date
n - Name
p - PID of the container's init process
P - Profiles
s - State
S - Number of snapshots
t - Type (persistent or ephemeral)
Custom columns are defined with "key[:name][:maxWidth]":
KEY: The (extended) config key to display
NAME: Name to display in the column header.
Defaults to the key if not specified or empty.
MAXWIDTH: Max width of the column (longer results are truncated).
Defaults to -1 (unlimited). Use 0 to limit to the column header size.
*Examples*
lxc list -c n,volatile.base_image:"BASE IMAGE":0,s46,volatile.eth0.hwaddr:MAC
Shows a list of containers using the "NAME", "BASE IMAGE", "STATE", "IPV4",
"IPV6" and "MAC" columns.
"BASE IMAGE" and "MAC" are custom columns generated from container configuration keys.
lxc list -c ns,user.comment:comment
List images with their running state and user comment. `)
}
func (c *listCmd) flags() {
gnuflag.StringVar(&c.columnsRaw, "c", "ns46tS", i18n.G("Columns"))
gnuflag.StringVar(&c.columnsRaw, "columns", "ns46tS", i18n.G("Columns"))
gnuflag.StringVar(&c.format, "format", "table", i18n.G("Format (csv|json|table|yaml)"))
gnuflag.BoolVar(&c.fast, "fast", false, i18n.G("Fast mode (same as --columns=nsacPt)"))
}
// This seems a little excessive.
func (c *listCmd) dotPrefixMatch(short string, full string) bool {
fullMembs := strings.Split(full, ".")
shortMembs := strings.Split(short, ".")
if len(fullMembs) != len(shortMembs) {
return false
}
for i := range fullMembs {
if !strings.HasPrefix(fullMembs[i], shortMembs[i]) {
return false
}
}
return true
}
func (c *listCmd) shouldShow(filters []string, state *api.Container) bool {
for _, filter := range filters {
if strings.Contains(filter, "=") {
membs := strings.SplitN(filter, "=", 2)
key := membs[0]
var value string
if len(membs) < 2 {
value = ""
} else {
value = membs[1]
}
found := false
for configKey, configValue := range state.ExpandedConfig {
if c.dotPrefixMatch(key, configKey) {
//try to test filter value as a regexp
regexpValue := value
if !(strings.Contains(value, "^") || strings.Contains(value, "$")) {
regexpValue = "^" + regexpValue + "$"
}
r, err := regexp.Compile(regexpValue)
//if not regexp compatible use original value
if err != nil {
if value == configValue {
found = true
break
} else {
// the property was found but didn't match
return false
}
} else if r.MatchString(configValue) == true {
found = true
break
}
}
}
if state.ExpandedConfig[key] == value {
return true
}
if !found {
return false
}
} else {
regexpValue := filter
if !(strings.Contains(filter, "^") || strings.Contains(filter, "$")) {
regexpValue = "^" + regexpValue + "$"
}
r, err := regexp.Compile(regexpValue)
if err == nil && r.MatchString(state.Name) == true {
return true
}
if !strings.HasPrefix(state.Name, filter) {
return false
}
}
}
return true
}
func (c *listCmd) listContainers(d *lxd.Client, cinfos []api.Container, filters []string, columns []column) error {
headers := []string{}
for _, column := range columns {
headers = append(headers, column.Name)
}
threads := 10
if len(cinfos) < threads {
threads = len(cinfos)
}
cStates := map[string]*api.ContainerState{}
cStatesLock := sync.Mutex{}
cStatesQueue := make(chan string, threads)
cStatesWg := sync.WaitGroup{}
cSnapshots := map[string][]api.ContainerSnapshot{}
cSnapshotsLock := sync.Mutex{}
cSnapshotsQueue := make(chan string, threads)
cSnapshotsWg := sync.WaitGroup{}
for i := 0; i < threads; i++ {
cStatesWg.Add(1)
go func() {
d, err := lxd.NewClient(&d.Config, d.Name)
if err != nil {
cStatesWg.Done()
return
}
for {
cName, more := <-cStatesQueue
if !more {
break
}
state, err := d.ContainerState(cName)
if err != nil {
continue
}
cStatesLock.Lock()
cStates[cName] = state
cStatesLock.Unlock()
}
cStatesWg.Done()
}()
cSnapshotsWg.Add(1)
go func() {
d, err := lxd.NewClient(&d.Config, d.Name)
if err != nil {
cSnapshotsWg.Done()
return
}
for {
cName, more := <-cSnapshotsQueue
if !more {
break
}
snaps, err := d.ListSnapshots(cName)
if err != nil {
continue
}
cSnapshotsLock.Lock()
cSnapshots[cName] = snaps
cSnapshotsLock.Unlock()
}
cSnapshotsWg.Done()
}()
}
for _, cInfo := range cinfos {
for _, column := range columns {
if column.NeedsState && cInfo.IsActive() {
cStatesLock.Lock()
_, ok := cStates[cInfo.Name]
cStatesLock.Unlock()
if ok {
continue
}
cStatesLock.Lock()
cStates[cInfo.Name] = nil
cStatesLock.Unlock()
cStatesQueue <- cInfo.Name
}
if column.NeedsSnapshots {
cSnapshotsLock.Lock()
_, ok := cSnapshots[cInfo.Name]
cSnapshotsLock.Unlock()
if ok {
continue
}
cSnapshotsLock.Lock()
cSnapshots[cInfo.Name] = nil
cSnapshotsLock.Unlock()
cSnapshotsQueue <- cInfo.Name
}
}
}
close(cStatesQueue)
close(cSnapshotsQueue)
cStatesWg.Wait()
cSnapshotsWg.Wait()
tableData := func() [][]string {
data := [][]string{}
for _, cInfo := range cinfos {
if !c.shouldShow(filters, &cInfo) {
continue
}
col := []string{}
for _, column := range columns {
col = append(col, column.Data(cInfo, cStates[cInfo.Name], cSnapshots[cInfo.Name]))
}
data = append(data, col)
}
sort.Sort(byName(data))
return data
}
switch c.format {
case listFormatCSV:
w := csv.NewWriter(os.Stdout)
w.WriteAll(tableData())
if err := w.Error(); err != nil {
return err
}
case listFormatTable:
table := tablewriter.NewWriter(os.Stdout)
table.SetAutoWrapText(false)
table.SetAlignment(tablewriter.ALIGN_LEFT)
table.SetRowLine(true)
table.SetHeader(headers)
table.AppendBulk(tableData())
table.Render()
case listFormatJSON:
data := make([]listContainerItem, len(cinfos))
for i := range cinfos {
data[i].Container = &cinfos[i]
data[i].State = cStates[cinfos[i].Name]
data[i].Snapshots = cSnapshots[cinfos[i].Name]
}
enc := json.NewEncoder(os.Stdout)
err := enc.Encode(data)
if err != nil {
return err
}
case listFormatYAML:
data := make([]listContainerItem, len(cinfos))
for i := range cinfos {
data[i].Container = &cinfos[i]
data[i].State = cStates[cinfos[i].Name]
data[i].Snapshots = cSnapshots[cinfos[i].Name]
}
out, err := yaml.Marshal(data)
if err != nil {
return err
}
fmt.Printf("%s", out)
default:
return fmt.Errorf("invalid format %q", c.format)
}
return nil
}
type listContainerItem struct {
*api.Container
State *api.ContainerState `json:"state" yaml:"state"`
Snapshots []api.ContainerSnapshot `json:"snapshots" yaml:"snapshots"`
}
func (c *listCmd) run(config *lxd.Config, args []string) error {
var remote string
name := ""
filters := []string{}
if len(args) != 0 {
filters = args
if strings.Contains(args[0], ":") && !strings.Contains(args[0], "=") {
remote, name = config.ParseRemoteAndContainer(args[0])
filters = args[1:]
} else if !strings.Contains(args[0], "=") {
remote = config.DefaultRemote
name = args[0]
}
}
filters = append(filters, name)
if remote == "" {
remote = config.DefaultRemote
}
d, err := lxd.NewClient(config, remote)
if err != nil {
return err
}
var cts []api.Container
ctslist, err := d.ListContainers()
if err != nil {
return err
}
for _, cinfo := range ctslist {
if !c.shouldShow(filters, &cinfo) {
continue
}
cts = append(cts, cinfo)
}
columns, err := c.parseColumns()
if err != nil {
return err
}
return c.listContainers(d, cts, filters, columns)
}
func (c *listCmd) parseColumns() ([]column, error) {
columnsShorthandMap := map[rune]column{
'4': {i18n.G("IPV4"), c.IP4ColumnData, true, false},
'6': {i18n.G("IPV6"), c.IP6ColumnData, true, false},
'a': {i18n.G("ARCHITECTURE"), c.ArchitectureColumnData, false, false},
'c': {i18n.G("CREATED AT"), c.CreatedColumnData, false, false},
'd': {i18n.G("DESCRIPTION"), c.descriptionColumnData, false, false},
'l': {i18n.G("LAST USED AT"), c.LastUsedColumnData, false, false},
'n': {i18n.G("NAME"), c.nameColumnData, false, false},
'p': {i18n.G("PID"), c.PIDColumnData, true, false},
'P': {i18n.G("PROFILES"), c.ProfilesColumnData, false, false},
'S': {i18n.G("SNAPSHOTS"), c.numberSnapshotsColumnData, false, true},
's': {i18n.G("STATE"), c.statusColumnData, false, false},
't': {i18n.G("TYPE"), c.typeColumnData, false, false},
'b': {i18n.G("STORAGE POOL"), c.StoragePoolColumnData, false, false},
}
if c.fast {
c.columnsRaw = "nsacPt"
}
columnList := strings.Split(c.columnsRaw, ",")
columns := []column{}
for _, columnEntry := range columnList {
if columnEntry == "" {
return nil, fmt.Errorf("Empty column entry (redundant, leading or trailing command) in '%s'", c.columnsRaw)
}
// Config keys always contain a period, parse anything without a
// period as a series of shorthand runes.
if !strings.Contains(columnEntry, ".") {
for _, columnRune := range columnEntry {
if column, ok := columnsShorthandMap[columnRune]; ok {
columns = append(columns, column)
} else {
return nil, fmt.Errorf("Unknown column shorthand char '%c' in '%s'", columnRune, columnEntry)
}
}
} else {
cc := strings.Split(columnEntry, ":")
if len(cc) > 3 {
return nil, fmt.Errorf("Invalid config key column format (too many fields): '%s'", columnEntry)
}
k := cc[0]
if _, err := shared.ConfigKeyChecker(k); err != nil {
return nil, fmt.Errorf("Invalid config key '%s' in '%s'", k, columnEntry)
}
column := column{Name: k}
if len(cc) > 1 {
if len(cc[1]) == 0 && len(cc) != 3 {
return nil, fmt.Errorf("Invalid name in '%s', empty string is only allowed when defining maxWidth", columnEntry)
}
column.Name = cc[1]
}
maxWidth := -1
if len(cc) > 2 {
temp, err := strconv.ParseInt(cc[2], 10, 64)
if err != nil {
return nil, fmt.Errorf("Invalid max width (must be an integer) '%s' in '%s'", cc[2], columnEntry)
}
if temp < -1 {
return nil, fmt.Errorf("Invalid max width (must -1, 0 or a positive integer) '%s' in '%s'", cc[2], columnEntry)
}
if temp == 0 {
maxWidth = len(column.Name)
} else {
maxWidth = int(temp)
}
}
column.Data = func(cInfo api.Container, cState *api.ContainerState, cSnaps []api.ContainerSnapshot) string {
v, ok := cInfo.Config[k]
if !ok {
v, _ = cInfo.ExpandedConfig[k]
}
// Truncate the data according to the max width. A negative max width
// indicates there is no effective limit.
if maxWidth > 0 && len(v) > maxWidth {
return v[:maxWidth]
}
return v
}
columns = append(columns, column)
}
}
return columns, nil
}
func (c *listCmd) nameColumnData(cInfo api.Container, cState *api.ContainerState, cSnaps []api.ContainerSnapshot) string {
return cInfo.Name
}
func (c *listCmd) descriptionColumnData(cInfo api.Container, cState *api.ContainerState, cSnaps []api.ContainerSnapshot) string {
return cInfo.Description
}
func (c *listCmd) statusColumnData(cInfo api.Container, cState *api.ContainerState, cSnaps []api.ContainerSnapshot) string {
return strings.ToUpper(cInfo.Status)
}
func (c *listCmd) IP4ColumnData(cInfo api.Container, cState *api.ContainerState, cSnaps []api.ContainerSnapshot) string {
if cInfo.IsActive() && cState != nil && cState.Network != nil {
ipv4s := []string{}
for netName, net := range cState.Network {
if net.Type == "loopback" {
continue
}
for _, addr := range net.Addresses {
if shared.StringInSlice(addr.Scope, []string{"link", "local"}) {
continue
}
if addr.Family == "inet" {
ipv4s = append(ipv4s, fmt.Sprintf("%s (%s)", addr.Address, netName))
}
}
}
sort.Sort(sort.Reverse(sort.StringSlice(ipv4s)))
return strings.Join(ipv4s, "\n")
} else {
return ""
}
}
func (c *listCmd) IP6ColumnData(cInfo api.Container, cState *api.ContainerState, cSnaps []api.ContainerSnapshot) string {
if cInfo.IsActive() && cState != nil && cState.Network != nil {
ipv6s := []string{}
for netName, net := range cState.Network {
if net.Type == "loopback" {
continue
}
for _, addr := range net.Addresses {
if shared.StringInSlice(addr.Scope, []string{"link", "local"}) {
continue
}
if addr.Family == "inet6" {
ipv6s = append(ipv6s, fmt.Sprintf("%s (%s)", addr.Address, netName))
}
}
}
sort.Sort(sort.Reverse(sort.StringSlice(ipv6s)))
return strings.Join(ipv6s, "\n")
} else {
return ""
}
}
func (c *listCmd) typeColumnData(cInfo api.Container, cState *api.ContainerState, cSnaps []api.ContainerSnapshot) string {
if cInfo.Ephemeral {
return i18n.G("EPHEMERAL")
} else {
return i18n.G("PERSISTENT")
}
}
func (c *listCmd) numberSnapshotsColumnData(cInfo api.Container, cState *api.ContainerState, cSnaps []api.ContainerSnapshot) string {
if cSnaps != nil {
return fmt.Sprintf("%d", len(cSnaps))
}
return ""
}
func (c *listCmd) PIDColumnData(cInfo api.Container, cState *api.ContainerState, cSnaps []api.ContainerSnapshot) string {
if cInfo.IsActive() && cState != nil {
return fmt.Sprintf("%d", cState.Pid)
}
return ""
}
func (c *listCmd) ArchitectureColumnData(cInfo api.Container, cState *api.ContainerState, cSnaps []api.ContainerSnapshot) string {
return cInfo.Architecture
}
func (c *listCmd) StoragePoolColumnData(cInfo api.Container, cState *api.ContainerState, cSnaps []api.ContainerSnapshot) string {
for _, v := range cInfo.ExpandedDevices {
if v["type"] == "disk" && v["path"] == "/" {
return v["pool"]
}
}
return ""
}
func (c *listCmd) ProfilesColumnData(cInfo api.Container, cState *api.ContainerState, cSnaps []api.ContainerSnapshot) string {
return strings.Join(cInfo.Profiles, "\n")
}
func (c *listCmd) CreatedColumnData(cInfo api.Container, cState *api.ContainerState, cSnaps []api.ContainerSnapshot) string {
layout := "2006/01/02 15:04 UTC"
if shared.TimeIsSet(cInfo.CreatedAt) {
return cInfo.CreatedAt.UTC().Format(layout)
}
return ""
}
func (c *listCmd) LastUsedColumnData(cInfo api.Container, cState *api.ContainerState, cSnaps []api.ContainerSnapshot) string {
layout := "2006/01/02 15:04 UTC"
if !cInfo.LastUsedAt.IsZero() && shared.TimeIsSet(cInfo.LastUsedAt) {
return cInfo.LastUsedAt.UTC().Format(layout)
}
return ""
}