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https://github.com/containers/podman.git
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c2284962c7
This is mostly used with Systemd, which really wants to manage CGroups itself when managing containers via unit file. Signed-off-by: Matthew Heon <matthew.heon@pm.me>
68 lines
2.2 KiB
Go
68 lines
2.2 KiB
Go
// +build linux
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package libpod
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import (
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"strconv"
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"strings"
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"github.com/containers/libpod/libpod/define"
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"github.com/containers/libpod/pkg/rootless"
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"github.com/containers/psgo"
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"github.com/pkg/errors"
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)
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// Top gathers statistics about the running processes in a container. It returns a
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// []string for output
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func (c *Container) Top(descriptors []string) ([]string, error) {
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if c.config.NoCgroups {
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return nil, errors.Wrapf(define.ErrNoCgroups, "cannot run top on container %s as it did not create a cgroup", c.ID())
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}
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conStat, err := c.State()
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if err != nil {
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return nil, errors.Wrapf(err, "unable to look up state for %s", c.ID())
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}
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if conStat != define.ContainerStateRunning {
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return nil, errors.Errorf("top can only be used on running containers")
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}
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// Also support comma-separated input.
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psgoDescriptors := []string{}
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for _, d := range descriptors {
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for _, s := range strings.Split(d, ",") {
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if s != "" {
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psgoDescriptors = append(psgoDescriptors, s)
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}
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}
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}
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return c.GetContainerPidInformation(psgoDescriptors)
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}
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// GetContainerPidInformation returns process-related data of all processes in
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// the container. The output data can be controlled via the `descriptors`
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// argument which expects format descriptors and supports all AIXformat
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// descriptors of ps (1) plus some additional ones to for instance inspect the
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// set of effective capabilities. Each element in the returned string slice
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// is a tab-separated string.
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//
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// For more details, please refer to github.com/containers/psgo.
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func (c *Container) GetContainerPidInformation(descriptors []string) ([]string, error) {
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pid := strconv.Itoa(c.state.PID)
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// TODO: psgo returns a [][]string to give users the ability to apply
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// filters on the data. We need to change the API here and the
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// varlink API to return a [][]string if we want to make use of
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// filtering.
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opts := psgo.JoinNamespaceOpts{FillMappings: rootless.IsRootless()}
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psgoOutput, err := psgo.JoinNamespaceAndProcessInfoWithOptions(pid, descriptors, &opts)
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if err != nil {
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return nil, err
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}
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res := []string{}
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for _, out := range psgoOutput {
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res = append(res, strings.Join(out, "\t"))
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}
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return res, nil
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}
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