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, 25 insertions, 0 deletions

diff --git a/pkg/api/handlers/libpod/containers.go b/pkg/api/handlers/libpod/containers.go
index 5d85d4009..d1460569f 100644
--- a/pkg/api/handlers/libpod/containers.go
+++ b/pkg/api/handlers/libpod/containers.go
@@ -1,6 +1,7 @@
 package libpod
 
 import (
+	"encoding/json"
 	"errors"
 	"fmt"
 	"io/ioutil"
@@ -10,6 +11,7 @@ import (
 
 	"github.com/containers/podman/v4/libpod"
 	"github.com/containers/podman/v4/libpod/define"
+	"github.com/containers/podman/v4/pkg/api/handlers"
 	"github.com/containers/podman/v4/pkg/api/handlers/compat"
 	"github.com/containers/podman/v4/pkg/api/handlers/utils"
 	api "github.com/containers/podman/v4/pkg/api/types"
@@ -17,6 +19,7 @@ import (
 	"github.com/containers/podman/v4/pkg/domain/infra/abi"
 	"github.com/containers/podman/v4/pkg/util"
 	"github.com/gorilla/schema"
+	"github.com/opencontainers/runtime-spec/specs-go"
 	"github.com/sirupsen/logrus"
 )
 
@@ -391,6 +394,28 @@ func InitContainer(w http.ResponseWriter, r *http.Request) {
 	utils.WriteResponse(w, http.StatusNoContent, "")
 }
 
+func UpdateContainer(w http.ResponseWriter, r *http.Request) {
+	name := utils.GetName(r)
+	runtime := r.Context().Value(api.RuntimeKey).(*libpod.Runtime)
+	ctr, err := runtime.LookupContainer(name)
+	if err != nil {
+		utils.ContainerNotFound(w, name, err)
+		return
+	}
+
+	options := &handlers.UpdateEntities{Resources: &specs.LinuxResources{}}
+	if err := json.NewDecoder(r.Body).Decode(&options.Resources); err != nil {
+		utils.Error(w, http.StatusInternalServerError, fmt.Errorf("decode(): %w", err))
+		return
+	}
+	err = ctr.Update(options.Resources)
+	if err != nil {
+		utils.InternalServerError(w, err)
+		return
+	}
+	utils.WriteResponse(w, http.StatusCreated, ctr.ID())
+}
+
 func ShouldRestart(w http.ResponseWriter, r *http.Request) {
 	runtime := r.Context().Value(api.RuntimeKey).(*libpod.Runtime)
 	// Now use the ABI implementation to prevent us from having duplicate