podman/libpod/container_top_linux.go

// +build linux

package libpod

import (
	"strconv"
	"strings"

	"github.com/containers/psgo"
)

// GetContainerPidInformation returns process-related data of all processes in
// the container.  The output data can be controlled via the `descriptors`
// argument which expects format descriptors and supports all AIXformat
// descriptors of ps (1) plus some additional ones to for instance inspect the
// set of effective capabilities.  Eeach element in the returned string slice
// is a tab-separated string.
//
// For more details, please refer to github.com/containers/psgo.
func (c *Container) GetContainerPidInformation(descriptors []string) ([]string, error) {
	pid := strconv.Itoa(c.state.PID)
	// TODO: psgo returns a [][]string to give users the ability to apply
	//       filters on the data.  We need to change the API here and the
	//       varlink API to return a [][]string if we want to make use of
	//       filtering.
	psgoOutput, err := psgo.JoinNamespaceAndProcessInfo(pid, descriptors)
	if err != nil {
		return nil, err
	}
	res := []string{}
	for _, out := range psgoOutput {
		res = append(res, strings.Join(out, "\t"))
	}
	return res, nil
}

// GetContainerPidInformationDescriptors returns a string slice of all supported
// format descriptors of GetContainerPidInformation.
func GetContainerPidInformationDescriptors() ([]string, error) {
	return psgo.ListDescriptors(), nil
}