feat: allow compatibility with podman v4 machine

Signed-off-by: Florian Bezannier <florian.bezannier@hotmail.fr>

libpod/container_inspect.go

@@ -5,9 +5,7 @@ package libpod
 import (
 	"errors"
 	"fmt"
-	"strconv"
 	"strings"
-	"syscall"
 
 	"github.com/containers/podman/v5/libpod/define"
 	"github.com/containers/podman/v5/libpod/driver"
@@ -407,11 +405,7 @@ func (c *Container) generateInspectContainerConfig(spec *spec.Spec) *define.Insp
 			ctrConfig.Annotations[k] = v
 		}
 	}
-	var signal, err = signal.ParseSysSignalToName(syscall.Signal(c.config.StopSignal))
-	if err != nil {
-		signal = strconv.FormatUint(uint64(c.config.StopSignal), 10)
-	}
-	ctrConfig.StopSignal = fmt.Sprintf("SIG%s", signal)
+	ctrConfig.StopSignal = signal.ToDockerFormat(c.config.StopSignal)
 	// TODO: should JSON deep copy this to ensure internal pointers don't
 	// leak.
 	ctrConfig.Healthcheck = c.config.HealthCheckConfig

libpod/define/container_inspect.go

@@ -1,9 +1,12 @@
 package define
 
 import (
+	"encoding/json"
+	"fmt"
 	"time"
 
 	"github.com/containers/image/v5/manifest"
+	"github.com/containers/podman/v5/pkg/signal"
 )
 
 type InspectIDMappings struct {
@@ -87,6 +90,51 @@ type InspectContainerConfig struct {
 	SdNotifySocket string `json:"sdNotifySocket,omitempty"`
 }
 
+// UnmarshalJSON allow compatibility with podman V4 API
+func (insp *InspectContainerConfig) UnmarshalJSON(data []byte) error {
+	type Alias InspectContainerConfig
+	aux := &struct {
+		Entrypoint interface{} `json:"Entrypoint"`
+		StopSignal interface{} `json:"StopSignal"`
+		*Alias
+	}{
+		Alias: (*Alias)(insp),
+	}
+	if err := json.Unmarshal(data, &aux); err != nil {
+		return err
+	}
+
+	switch entrypoint := aux.Entrypoint.(type) {
+	case string:
+		insp.Entrypoint = []string{entrypoint}
+	case []string:
+		insp.Entrypoint = entrypoint
+	case []interface{}:
+		insp.Entrypoint = []string{}
+		for _, entry := range entrypoint {
+			if str, ok := entry.(string); ok {
+				insp.Entrypoint = append(insp.Entrypoint, str)
+			}
+		}
+	case nil:
+		insp.Entrypoint = []string{}
+	default:
+		return fmt.Errorf("cannot unmarshal Config.Entrypoint of type  %T", entrypoint)
+	}
+
+	switch stopsignal := aux.StopSignal.(type) {
+	case string:
+		insp.StopSignal = stopsignal
+	case float64:
+		insp.StopSignal = signal.ToDockerFormat(uint(stopsignal))
+	case nil:
+		break
+	default:
+		return fmt.Errorf("cannot unmarshal Config.StopSignal of type  %T", stopsignal)
+	}
+	return nil
+}
+
 // InspectRestartPolicy holds information about the container's restart policy.
 type InspectRestartPolicy struct {
 	// Name contains the container's restart policy.

pkg/signal/signal_common.go

@@ -71,3 +71,11 @@ func ParseSysSignalToName(s syscall.Signal) (string, error) {
 	}
 	return "", fmt.Errorf("unknown syscall signal: %s", s)
 }
+
+func ToDockerFormat(s uint) string {
+	var signalStr, err = ParseSysSignalToName(syscall.Signal(s))
+	if err != nil {
+		signalStr = strconv.FormatUint(uint64(s), 10)
+	}
+	return fmt.Sprintf("SIG%s", signalStr)
+}