implement podman update

podman update allows users to change the cgroup configuration of an existing container using the already defined resource limits flags
from podman create/run. The supported flags in crun are:

this command is also now supported in the libpod api via the /libpod/containers/<CID>/update endpoint where
the resource limits are passed inthe request body and follow the OCI resource spec format

–memory
–cpus
–cpuset-cpus
–cpuset-mems
–memory-swap
–memory-reservation
–cpu-shares
–cpu-quota
–cpu-period
–blkio-weight
–cpu-rt-period
–cpu-rt-runtime
-device-read-bps
-device-write-bps
-device-read-iops
-device-write-iops
-memory-swappiness
-blkio-weight-device

resolves #15067

Signed-off-by: Charlie Doern <cdoern@redhat.com>

1 files changed, 24 insertions, 0 deletions

diff --git a/pkg/domain/infra/abi/containers.go b/pkg/domain/infra/abi/containers.go
index 0a8e5bc2f..dfa3c5ba0 100644
--- a/pkg/domain/infra/abi/containers.go
+++ b/pkg/domain/infra/abi/containers.go
@@ -1715,3 +1715,27 @@ func (ic *ContainerEngine) ContainerClone(ctx context.Context, ctrCloneOpts enti
 
 	return &entities.ContainerCreateReport{Id: ctr.ID()}, nil
 }
+
+// ContainerUpdate finds and updates the given container's cgroup config with the specified options
+func (ic *ContainerEngine) ContainerUpdate(ctx context.Context, updateOptions *entities.ContainerUpdateOptions) (string, error) {
+	err := specgen.WeightDevices(updateOptions.Specgen)
+	if err != nil {
+		return "", err
+	}
+	err = specgen.FinishThrottleDevices(updateOptions.Specgen)
+	if err != nil {
+		return "", err
+	}
+	ctrs, err := getContainersByContext(false, false, []string{updateOptions.NameOrID}, ic.Libpod)
+	if err != nil {
+		return "", err
+	}
+	if len(ctrs) != 1 {
+		return "", fmt.Errorf("container not found")
+	}
+
+	if err = ctrs[0].Update(updateOptions.Specgen.ResourceLimits); err != nil {
+		return "", err
+	}
+	return ctrs[0].ID(), nil
+}