package main import ( "os" "path/filepath" "reflect" "regexp" "strconv" "strings" "time" "github.com/docker/go-units" specs "github.com/opencontainers/runtime-spec/specs-go" "github.com/sirupsen/logrus" "k8s.io/apimachinery/pkg/fields" "github.com/projectatomic/libpod/cmd/kpod/formats" "github.com/projectatomic/libpod/libkpod" "github.com/projectatomic/libpod/oci" "github.com/pkg/errors" "github.com/urfave/cli" ) type psOptions struct { all bool filter string format string last int latest bool noTrunc bool quiet bool size bool label string namespace bool } type psTemplateParams struct { ID string Image string Command string CreatedAt string RunningFor string Status string Ports string Size string Names string Labels string Mounts string PID int Cgroup string IPC string MNT string NET string PIDNS string User string UTS string } // psJSONParams is only used when the JSON format is specified, // and is better for data processing from JSON. // psJSONParams will be populated by data from libkpod.ContainerData, // the members of the struct are the sama data types as their sources. type psJSONParams struct { ID string `json:"id"` Image string `json:"image"` ImageID string `json:"image_id"` Command string `json:"command"` CreatedAt time.Time `json:"createdAt"` RunningFor time.Duration `json:"runningFor"` Status string `json:"status"` Ports map[string]struct{} `json:"ports"` Size uint `json:"size"` Names string `json:"names"` Labels fields.Set `json:"labels"` Mounts []specs.Mount `json:"mounts"` ContainerRunning bool `json:"ctrRunning"` Namespaces *namespace `json:"namespace,omitempty"` } type namespace struct { PID string `json:"pid,omitempty"` Cgroup string `json:"cgroup,omitempty"` IPC string `json:"ipc,omitempty"` MNT string `json:"mnt,omitempty"` NET string `json:"net,omitempty"` PIDNS string `json:"pidns,omitempty"` User string `json:"user,omitempty"` UTS string `json:"uts,omitempty"` } var ( psFlags = []cli.Flag{ cli.BoolFlag{ Name: "all, a", Usage: "Show all the containers, default is only running containers", }, cli.StringFlag{ Name: "filter, f", Usage: "Filter output based on conditions given", }, cli.StringFlag{ Name: "format", Usage: "Pretty-print containers to JSON or using a Go template", }, cli.IntFlag{ Name: "last, n", Usage: "Print the n last created containers (all states)", Value: -1, }, cli.BoolFlag{ Name: "latest, l", Usage: "Show the latest container created (all states)", }, cli.BoolFlag{ Name: "no-trunc", Usage: "Display the extended information", }, cli.BoolFlag{ Name: "quiet, q", Usage: "Print the numeric IDs of the containers only", }, cli.BoolFlag{ Name: "size, s", Usage: "Display the total file sizes", }, cli.BoolFlag{ Name: "namespace, ns", Usage: "Display namespace information", }, } psDescription = "Prints out information about the containers" psCommand = cli.Command{ Name: "ps", Usage: "List containers", Description: psDescription, Flags: psFlags, Action: psCmd, ArgsUsage: "", } ) func psCmd(c *cli.Context) error { if err := validateFlags(c, psFlags); err != nil { return err } config, err := getConfig(c) if err != nil { return errors.Wrapf(err, "could not get config") } server, err := libkpod.New(config) if err != nil { return errors.Wrapf(err, "error creating server") } if err := server.Update(); err != nil { return errors.Wrapf(err, "error updating list of containers") } if len(c.Args()) > 0 { return errors.Errorf("too many arguments, ps takes no arguments") } format := genPsFormat(c.Bool("quiet"), c.Bool("size"), c.Bool("namespace")) if c.IsSet("format") { format = c.String("format") } opts := psOptions{ all: c.Bool("all"), filter: c.String("filter"), format: format, last: c.Int("last"), latest: c.Bool("latest"), noTrunc: c.Bool("no-trunc"), quiet: c.Bool("quiet"), size: c.Bool("size"), namespace: c.Bool("namespace"), } // all, latest, and last are mutually exclusive. Only one flag can be used at a time exclusiveOpts := 0 if opts.last >= 0 { exclusiveOpts++ } if opts.latest { exclusiveOpts++ } if opts.all { exclusiveOpts++ } if exclusiveOpts > 1 { return errors.Errorf("Last, latest and all are mutually exclusive") } containers, err := server.ListContainers() if err != nil { return errors.Wrapf(err, "error getting containers from server") } var params *FilterParamsPS if opts.filter != "" { params, err = parseFilter(opts.filter, containers) if err != nil { return errors.Wrapf(err, "error parsing filter") } } else { params = nil } containerList := getContainersMatchingFilter(containers, params, server) return generatePsOutput(containerList, server, opts) } // generate the template based on conditions given func genPsFormat(quiet, size, namespace bool) (format string) { if quiet { return formats.IDString } if namespace { format = "table {{.ID}}\t{{.Names}}\t{{.PID}}\t{{.Cgroup}}\t{{.IPC}}\t{{.MNT}}\t{{.NET}}\t{{.PIDNS}}\t{{.User}}\t{{.UTS}}\t" return } format = "table {{.ID}}\t{{.Image}}\t{{.Command}}\t{{.CreatedAt}}\t{{.Status}}\t{{.Ports}}\t{{.Names}}\t" if size { format += "{{.Size}}\t" } return } func psToGeneric(templParams []psTemplateParams, JSONParams []psJSONParams) (genericParams []interface{}) { if len(templParams) > 0 { for _, v := range templParams { genericParams = append(genericParams, interface{}(v)) } return } for _, v := range JSONParams { genericParams = append(genericParams, interface{}(v)) } return } // generate the accurate header based on template given func (p *psTemplateParams) headerMap() map[string]string { v := reflect.Indirect(reflect.ValueOf(p)) values := make(map[string]string) for i := 0; i < v.NumField(); i++ { key := v.Type().Field(i).Name value := key if value == "ID" { value = "Container" + value } values[key] = strings.ToUpper(splitCamelCase(value)) } return values } // getContainers gets the containers that match the flags given func getContainers(containers []*libkpod.ContainerData, opts psOptions) []*libkpod.ContainerData { var containersOutput []*libkpod.ContainerData if opts.last >= 0 && opts.last < len(containers) { for i := 0; i < opts.last; i++ { containersOutput = append(containersOutput, containers[i]) } return containersOutput } if opts.latest { return []*libkpod.ContainerData{containers[0]} } if opts.all || opts.last >= len(containers) { return containers } for _, ctr := range containers { if ctr.State.Status == oci.ContainerStateRunning { containersOutput = append(containersOutput, ctr) } } return containersOutput } // getTemplateOutput returns the modified container information func getTemplateOutput(containers []*libkpod.ContainerData, opts psOptions) (psOutput []psTemplateParams) { var status string for _, ctr := range containers { ctrID := ctr.ID runningFor := units.HumanDuration(time.Since(ctr.State.Created)) createdAt := runningFor + " ago" command := getStrFromSquareBrackets(ctr.ImageCreatedBy) imageName := ctr.FromImage mounts := getMounts(ctr.Mounts, opts.noTrunc) ports := getPorts(ctr.Config.ExposedPorts) size := units.HumanSize(float64(ctr.SizeRootFs)) labels := getLabels(ctr.Labels) ns := getNamespaces(ctr.State.Pid) switch ctr.State.Status { case oci.ContainerStateStopped: status = "Exited (" + strconv.FormatInt(int64(ctr.State.ExitCode), 10) + ") " + runningFor + " ago" case oci.ContainerStateRunning: status = "Up " + runningFor + " ago" case oci.ContainerStatePaused: status = "Paused" default: status = "Created" } if !opts.noTrunc { ctrID = ctr.ID[:idTruncLength] imageName = getImageName(ctr.FromImage) } params := psTemplateParams{ ID: ctrID, Image: imageName, Command: command, CreatedAt: createdAt, RunningFor: runningFor, Status: status, Ports: ports, Size: size, Names: ctr.Name, Labels: labels, Mounts: mounts, PID: ctr.State.Pid, Cgroup: ns.Cgroup, IPC: ns.IPC, MNT: ns.MNT, NET: ns.NET, PIDNS: ns.PID, User: ns.User, UTS: ns.UTS, } psOutput = append(psOutput, params) } return } func getNamespaces(pid int) *namespace { ctrPID := strconv.Itoa(pid) cgroup, _ := getNamespaceInfo(filepath.Join("/proc", ctrPID, "ns", "cgroup")) ipc, _ := getNamespaceInfo(filepath.Join("/proc", ctrPID, "ns", "ipc")) mnt, _ := getNamespaceInfo(filepath.Join("/proc", ctrPID, "ns", "mnt")) net, _ := getNamespaceInfo(filepath.Join("/proc", ctrPID, "ns", "net")) pidns, _ := getNamespaceInfo(filepath.Join("/proc", ctrPID, "ns", "pid")) user, _ := getNamespaceInfo(filepath.Join("/proc", ctrPID, "ns", "user")) uts, _ := getNamespaceInfo(filepath.Join("/proc", ctrPID, "ns", "uts")) return &namespace{ PID: ctrPID, Cgroup: cgroup, IPC: ipc, MNT: mnt, NET: net, PIDNS: pidns, User: user, UTS: uts, } } func getNamespaceInfo(path string) (string, error) { val, err := os.Readlink(path) if err != nil { return "", errors.Wrapf(err, "error getting info from %q", path) } return getStrFromSquareBrackets(val), nil } // getJSONOutput returns the container info in its raw form func getJSONOutput(containers []*libkpod.ContainerData, nSpace bool) (psOutput []psJSONParams) { var ns *namespace for _, ctr := range containers { if nSpace { ns = getNamespaces(ctr.State.Pid) } params := psJSONParams{ ID: ctr.ID, Image: ctr.FromImage, ImageID: ctr.FromImageID, Command: getStrFromSquareBrackets(ctr.ImageCreatedBy), CreatedAt: ctr.State.Created, RunningFor: time.Since(ctr.State.Created), Status: ctr.State.Status, Ports: ctr.Config.ExposedPorts, Size: ctr.SizeRootFs, Names: ctr.Name, Labels: ctr.Labels, Mounts: ctr.Mounts, ContainerRunning: ctr.State.Status == oci.ContainerStateRunning, Namespaces: ns, } psOutput = append(psOutput, params) } return } func generatePsOutput(containers []*libkpod.ContainerData, server *libkpod.ContainerServer, opts psOptions) error { containersOutput := getContainers(containers, opts) // In the case of JSON, we want to continue so we at least pass // {} --valid JSON-- to the consumer if len(containersOutput) == 0 && opts.format != formats.JSONString { return nil } var out formats.Writer switch opts.format { case formats.JSONString: psOutput := getJSONOutput(containersOutput, opts.namespace) out = formats.JSONStructArray{Output: psToGeneric([]psTemplateParams{}, psOutput)} default: psOutput := getTemplateOutput(containersOutput, opts) out = formats.StdoutTemplateArray{Output: psToGeneric(psOutput, []psJSONParams{}), Template: opts.format, Fields: psOutput[0].headerMap()} } return formats.Writer(out).Out() } // getStrFromSquareBrackets gets the string inside [] from a string func getStrFromSquareBrackets(cmd string) string { reg, err := regexp.Compile(".*\\[|\\].*") if err != nil { return "" } arr := strings.Split(reg.ReplaceAllLiteralString(cmd, ""), ",") return strings.Join(arr, ",") } // getImageName shortens the image name func getImageName(img string) string { arr := strings.Split(img, "/") if arr[0] == "docker.io" && arr[1] == "library" { img = strings.Join(arr[2:], "/") } else if arr[0] == "docker.io" { img = strings.Join(arr[1:], "/") } return img } // getLabels converts the labels to a string of the form "key=value, key2=value2" func getLabels(labels fields.Set) string { var arr []string if len(labels) > 0 { for key, val := range labels { temp := key + "=" + val arr = append(arr, temp) } return strings.Join(arr, ",") } return "" } // getMounts converts the volumes mounted to a string of the form "mount1, mount2" // it truncates it if noTrunc is false func getMounts(mounts []specs.Mount, noTrunc bool) string { var arr []string if len(mounts) == 0 { return "" } for _, mount := range mounts { if noTrunc { arr = append(arr, mount.Source) continue } tempArr := strings.SplitAfter(mount.Source, "/") if len(tempArr) >= 3 { arr = append(arr, strings.Join(tempArr[:3], "")) } else { arr = append(arr, mount.Source) } } return strings.Join(arr, ",") } // getPorts converts the ports used to a string of the from "port1, port2" func getPorts(ports map[string]struct{}) string { var arr []string if len(ports) == 0 { return "" } for key := range ports { arr = append(arr, key) } return strings.Join(arr, ",") } // FilterParamsPS contains the filter options for ps type FilterParamsPS struct { id string label string name string exited int32 status string ancestor string before time.Time since time.Time volume string } // parseFilter takes a filter string and a list of containers and filters it func parseFilter(filter string, containers []*oci.Container) (*FilterParamsPS, error) { params := new(FilterParamsPS) allFilters := strings.Split(filter, ",") for _, param := range allFilters { pair := strings.SplitN(param, "=", 2) switch strings.TrimSpace(pair[0]) { case "id": params.id = pair[1] case "label": params.label = pair[1] case "name": params.name = pair[1] case "exited": exitedCode, err := strconv.ParseInt(pair[1], 10, 32) if err != nil { return nil, errors.Errorf("exited code out of range %q", pair[1]) } params.exited = int32(exitedCode) case "status": params.status = pair[1] case "ancestor": params.ancestor = pair[1] case "before": if ctr, err := findContainer(containers, pair[1]); err == nil { params.before = ctr.CreatedAt() } else { return nil, errors.Wrapf(err, "no such container %q", pair[1]) } case "since": if ctr, err := findContainer(containers, pair[1]); err == nil { params.before = ctr.CreatedAt() } else { return nil, errors.Wrapf(err, "no such container %q", pair[1]) } case "volume": params.volume = pair[1] default: return nil, errors.Errorf("invalid filter %q", pair[0]) } } return params, nil } // findContainer finds a container with a specific name or id from a list of containers func findContainer(containers []*oci.Container, ref string) (*oci.Container, error) { for _, ctr := range containers { if strings.HasPrefix(ctr.ID(), ref) || ctr.Name() == ref { return ctr, nil } } return nil, errors.Errorf("could not find container") } // matchesFilter checks if a container matches all the filter parameters func matchesFilter(ctrData *libkpod.ContainerData, params *FilterParamsPS) bool { if params == nil { return true } if params.id != "" && !matchesID(ctrData, params.id) { return false } if params.name != "" && !matchesName(ctrData, params.name) { return false } if !params.before.IsZero() && !matchesBeforeContainer(ctrData, params.before) { return false } if !params.since.IsZero() && !matchesSinceContainer(ctrData, params.since) { return false } if params.exited > 0 && !matchesExited(ctrData, params.exited) { return false } if params.status != "" && !matchesStatus(ctrData, params.status) { return false } if params.ancestor != "" && !matchesAncestor(ctrData, params.ancestor) { return false } if params.label != "" && !matchesLabel(ctrData, params.label) { return false } if params.volume != "" && !matchesVolume(ctrData, params.volume) { return false } return true } // GetContainersMatchingFilter returns a slice of all the containers that match the provided filter parameters func getContainersMatchingFilter(containers []*oci.Container, filter *FilterParamsPS, server *libkpod.ContainerServer) []*libkpod.ContainerData { var filteredCtrs []*libkpod.ContainerData for _, ctr := range containers { ctrData, err := server.GetContainerData(ctr.ID(), true) if err != nil { logrus.Warn("unable to get container data for matched container") } if filter == nil || matchesFilter(ctrData, filter) { filteredCtrs = append(filteredCtrs, ctrData) } } return filteredCtrs } // matchesID returns true if the id's match func matchesID(ctrData *libkpod.ContainerData, id string) bool { return strings.HasPrefix(ctrData.ID, id) } // matchesBeforeContainer returns true if the container was created before the filter image func matchesBeforeContainer(ctrData *libkpod.ContainerData, beforeTime time.Time) bool { return ctrData.State.Created.Before(beforeTime) } // matchesSincecontainer returns true if the container was created since the filter image func matchesSinceContainer(ctrData *libkpod.ContainerData, sinceTime time.Time) bool { return ctrData.State.Created.After(sinceTime) } // matchesLabel returns true if the container label matches that of the filter label func matchesLabel(ctrData *libkpod.ContainerData, label string) bool { pair := strings.SplitN(label, "=", 2) if val, ok := ctrData.Labels[pair[0]]; ok { if len(pair) == 2 && val == pair[1] { return true } if len(pair) == 1 { return true } return false } return false } // matchesName returns true if the names are identical func matchesName(ctrData *libkpod.ContainerData, name string) bool { return ctrData.Name == name } // matchesExited returns true if the exit codes are identical func matchesExited(ctrData *libkpod.ContainerData, exited int32) bool { return ctrData.State.ExitCode == exited } // matchesStatus returns true if the container status matches that of filter status func matchesStatus(ctrData *libkpod.ContainerData, status string) bool { return ctrData.State.Status == status } // matchesAncestor returns true if filter ancestor is in container image name func matchesAncestor(ctrData *libkpod.ContainerData, ancestor string) bool { return strings.Contains(ctrData.FromImage, ancestor) } // matchesVolue returns true if the volume mounted or path to volue of the container matches that of filter volume func matchesVolume(ctrData *libkpod.ContainerData, volume string) bool { for _, vol := range ctrData.Mounts { if strings.Contains(vol.Source, volume) { return true } } return false }