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, 31 insertions, 0 deletions

diff --git a/pkg/bindings/containers/update.go b/pkg/bindings/containers/update.go
new file mode 100644
index 000000000..7cda7c306
--- /dev/null
+++ b/pkg/bindings/containers/update.go
@@ -0,0 +1,31 @@
+package containers
+
+import (
+	"context"
+	"net/http"
+	"strings"
+
+	"github.com/containers/podman/v4/pkg/bindings"
+	"github.com/containers/podman/v4/pkg/domain/entities"
+	jsoniter "github.com/json-iterator/go"
+)
+
+func Update(ctx context.Context, options *entities.ContainerUpdateOptions) (string, error) {
+	conn, err := bindings.GetClient(ctx)
+	if err != nil {
+		return "", err
+	}
+
+	resources, err := jsoniter.MarshalToString(options.Specgen.ResourceLimits)
+	if err != nil {
+		return "", err
+	}
+	stringReader := strings.NewReader(resources)
+	response, err := conn.DoRequest(ctx, stringReader, http.MethodPost, "/containers/%s/update", nil, nil, options.NameOrID)
+	if err != nil {
+		return "", err
+	}
+	defer response.Body.Close()
+
+	return options.NameOrID, response.Process(nil)
+}