Add container runlabel command

Execute the command as described by a container image.  The value of the label is processed
into a command by:

1. Ensuring the first argument of the command is podman.
2. Substituting any variables with those defined by the environment or otherwise.

If no label exists in the container image, nothing is done.

podman container runlabel LABEL IMAGE extra_args
Signed-off-by: baude <bbaude@redhat.com>

2 files changed, 21 insertions, 7 deletions

diff --git a/libpod/image/image.go b/libpod/image/image.go
index 197a83dc1..f39b1d78d 100644
--- a/libpod/image/image.go
+++ b/libpod/image/image.go
@@ -744,6 +744,20 @@ func (i *Image) Labels(ctx context.Context) (map[string]string, error) {
 	return imgInspect.Labels, nil
 }
 
+// GetLabel Returns a case-insensitive match of a given label
+func (i *Image) GetLabel(ctx context.Context, label string) (string, error) {
+	imageLabels, err := i.Labels(ctx)
+	if err != nil {
+		return "", err
+	}
+	for k, v := range imageLabels {
+		if strings.ToLower(k) == strings.ToLower(label) {
+			return v, nil
+		}
+	}
+	return "", nil
+}
+
 // Annotations returns the annotations of an image
 func (i *Image) Annotations(ctx context.Context) (map[string]string, error) {
 	manifest, manifestType, err := i.Manifest(ctx)
diff --git a/libpod/oci.go b/libpod/oci.go
index 3838394cb..17f0630c4 100644
--- a/libpod/oci.go
+++ b/libpod/oci.go
@@ -535,7 +535,7 @@ func (r *OCIRuntime) updateContainerStatus(ctr *Container) error {
 // Sets time the container was started, but does not save it.
 func (r *OCIRuntime) startContainer(ctr *Container) error {
 	// TODO: streams should probably *not* be our STDIN/OUT/ERR - redirect to buffers?
-	if err := utils.ExecCmdWithStdStreams(os.Stdin, os.Stdout, os.Stderr, r.path, "start", ctr.ID()); err != nil {
+	if err := utils.ExecCmdWithStdStreams(os.Stdin, os.Stdout, os.Stderr, nil, r.path, "start", ctr.ID()); err != nil {
 		return err
 	}
 
@@ -547,7 +547,7 @@ func (r *OCIRuntime) startContainer(ctr *Container) error {
 // killContainer sends the given signal to the given container
 func (r *OCIRuntime) killContainer(ctr *Container, signal uint) error {
 	logrus.Debugf("Sending signal %d to container %s", signal, ctr.ID())
-	if err := utils.ExecCmdWithStdStreams(os.Stdin, os.Stdout, os.Stderr, r.path, "kill", ctr.ID(), fmt.Sprintf("%d", signal)); err != nil {
+	if err := utils.ExecCmdWithStdStreams(os.Stdin, os.Stdout, os.Stderr, nil, r.path, "kill", ctr.ID(), fmt.Sprintf("%d", signal)); err != nil {
 		return errors.Wrapf(err, "error sending signal to container %s", ctr.ID())
 	}
 
@@ -605,7 +605,7 @@ func (r *OCIRuntime) stopContainer(ctr *Container, timeout uint) error {
 		args = []string{"kill", "--all", ctr.ID(), "KILL"}
 	}
 
-	if err := utils.ExecCmdWithStdStreams(os.Stdin, os.Stdout, os.Stderr, r.path, args...); err != nil {
+	if err := utils.ExecCmdWithStdStreams(os.Stdin, os.Stdout, os.Stderr, nil, r.path, args...); err != nil {
 		// Again, check if the container is gone. If it is, exit cleanly.
 		err := unix.Kill(ctr.state.PID, 0)
 		if err == unix.ESRCH {
@@ -631,12 +631,12 @@ func (r *OCIRuntime) deleteContainer(ctr *Container) error {
 
 // pauseContainer pauses the given container
 func (r *OCIRuntime) pauseContainer(ctr *Container) error {
-	return utils.ExecCmdWithStdStreams(os.Stdin, os.Stdout, os.Stderr, r.path, "pause", ctr.ID())
+	return utils.ExecCmdWithStdStreams(os.Stdin, os.Stdout, os.Stderr, nil, r.path, "pause", ctr.ID())
 }
 
 // unpauseContainer unpauses the given container
 func (r *OCIRuntime) unpauseContainer(ctr *Container) error {
-	return utils.ExecCmdWithStdStreams(os.Stdin, os.Stdout, os.Stderr, r.path, "resume", ctr.ID())
+	return utils.ExecCmdWithStdStreams(os.Stdin, os.Stdout, os.Stderr, nil, r.path, "resume", ctr.ID())
 }
 
 // execContainer executes a command in a running container
@@ -740,7 +740,7 @@ func (r *OCIRuntime) execStopContainer(ctr *Container, timeout uint) error {
 		// Stop using SIGTERM by default
 		// Use SIGSTOP after a timeout
 		logrus.Debugf("Killing all processes in container %s with SIGTERM", ctr.ID())
-		if err := utils.ExecCmdWithStdStreams(os.Stdin, os.Stdout, os.Stderr, r.path, "kill", "--all", ctr.ID(), "TERM"); err != nil {
+		if err := utils.ExecCmdWithStdStreams(os.Stdin, os.Stdout, os.Stderr, nil, r.path, "kill", "--all", ctr.ID(), "TERM"); err != nil {
 			return errors.Wrapf(err, "error sending SIGTERM to container %s processes", ctr.ID())
 		}
 
@@ -755,7 +755,7 @@ func (r *OCIRuntime) execStopContainer(ctr *Container, timeout uint) error {
 
 	// Send SIGKILL
 	logrus.Debugf("Killing all processes in container %s with SIGKILL", ctr.ID())
-	if err := utils.ExecCmdWithStdStreams(os.Stdin, os.Stdout, os.Stderr, r.path, "kill", "--all", ctr.ID(), "KILL"); err != nil {
+	if err := utils.ExecCmdWithStdStreams(os.Stdin, os.Stdout, os.Stderr, nil, r.path, "kill", "--all", ctr.ID(), "KILL"); err != nil {
 		return errors.Wrapf(err, "error sending SIGKILL to container %s processes", ctr.ID())
 	}