APIv2 compatibility rootless network fix

when using the compatibility mode as rootless, containers that were created were not setting their host names correctly due to the netmode not being set.

Fixes: #7934

Signed-off-by: baude <bbaude@redhat.com>

pkg/api/handlers/compat/containers_create.go

@@ -14,8 +14,10 @@ import (
 	"github.com/containers/podman/v2/pkg/api/handlers"
 	"github.com/containers/podman/v2/pkg/api/handlers/utils"
 	"github.com/containers/podman/v2/pkg/namespaces"
+	"github.com/containers/podman/v2/pkg/rootless"
 	"github.com/containers/podman/v2/pkg/signal"
 	createconfig "github.com/containers/podman/v2/pkg/spec"
+	"github.com/containers/podman/v2/pkg/specgen"
 	"github.com/containers/storage"
 	"github.com/gorilla/schema"
 	"github.com/pkg/errors"
@@ -134,6 +136,11 @@ func makeCreateConfig(ctx context.Context, containerConfig *config.Config, input
 		Sysctl:             input.HostConfig.Sysctls,
 	}
 
+	var netmode namespaces.NetworkMode
+	if rootless.IsRootless() {
+		netmode = namespaces.NetworkMode(specgen.Slirp)
+	}
+
 	network := createconfig.NetworkConfig{
 		DNSOpt:       input.HostConfig.DNSOptions,
 		DNSSearch:    input.HostConfig.DNSSearch,
@@ -144,7 +151,7 @@ func makeCreateConfig(ctx context.Context, containerConfig *config.Config, input
 		IPAddress:    "",
 		LinkLocalIP:  nil, // docker-only
 		MacAddress:   input.MacAddress,
-		// NetMode:      nil,
+		NetMode:      netmode,
 		Network:      input.HostConfig.NetworkMode.NetworkName(),
 		NetworkAlias: nil, // docker-only now
 		PortBindings: input.HostConfig.PortBindings,