Use PODMAN_USERNS environment variable when running as a service

Fixes: https://github.com/containers/podman/issues/11350#issuecomment-1011562526

Also add inspect information about the idmappings if they exists.

Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>

2 files changed, 23 insertions, 1 deletions

diff --git a/libpod/container_inspect.go b/libpod/container_inspect.go
index 792dfc58e..5e63db0f2 100644
--- a/libpod/container_inspect.go
+++ b/libpod/container_inspect.go
@@ -9,6 +9,7 @@ import (
 	"github.com/containers/podman/v3/libpod/define"
 	"github.com/containers/podman/v3/libpod/driver"
 	"github.com/containers/podman/v3/pkg/util"
+	"github.com/containers/storage/types"
 	units "github.com/docker/go-units"
 	spec "github.com/opencontainers/runtime-spec/specs-go"
 	"github.com/opencontainers/runtime-tools/generate"
@@ -403,6 +404,17 @@ func (c *Container) generateInspectContainerConfig(spec *spec.Spec) *define.Insp
 	return ctrConfig
 }
 
+func generateIDMappings(idMappings types.IDMappingOptions) *define.InspectIDMappings {
+	var inspectMappings define.InspectIDMappings
+	for _, uid := range idMappings.UIDMap {
+		inspectMappings.UIDMap = append(inspectMappings.UIDMap, fmt.Sprintf("%d:%d:%d", uid.ContainerID, uid.HostID, uid.Size))
+	}
+	for _, gid := range idMappings.GIDMap {
+		inspectMappings.GIDMap = append(inspectMappings.GIDMap, fmt.Sprintf("%d:%d:%d", gid.ContainerID, gid.HostID, gid.Size))
+	}
+	return &inspectMappings
+}
+
 // Generate the InspectContainerHostConfig struct for the HostConfig field of
 // Inspect.
 func (c *Container) generateInspectContainerHostConfig(ctrSpec *spec.Spec, namedVolumes []*ContainerNamedVolume, mounts []spec.Mount) (*define.InspectContainerHostConfig, error) {
@@ -815,7 +827,9 @@ func (c *Container) generateInspectContainerHostConfig(ctrSpec *spec.Spec, named
 		}
 	}
 	hostConfig.UsernsMode = usernsMode
-
+	if c.config.IDMappings.UIDMap != nil && c.config.IDMappings.GIDMap != nil {
+		hostConfig.IDMappings = generateIDMappings(c.config.IDMappings)
+	}
 	// Devices
 	// Do not include if privileged - assumed that all devices will be
 	// included.
diff --git a/libpod/define/container_inspect.go b/libpod/define/container_inspect.go
index ba73e4196..a61f9e615 100644
--- a/libpod/define/container_inspect.go
+++ b/libpod/define/container_inspect.go
@@ -6,6 +6,11 @@ import (
 	"github.com/containers/image/v5/manifest"
 )
 
+type InspectIDMappings struct {
+	UIDMap []string `json:"UidMap"`
+	GIDMap []string `json:"GidMap"`
+}
+
 // InspectContainerConfig holds further data about how a container was initially
 // configured.
 type InspectContainerConfig struct {
@@ -401,7 +406,10 @@ type InspectContainerHostConfig struct {
 	// TODO Rootless has an additional 'keep-id' option, presently not
 	// reflected here.
 	UsernsMode string `json:"UsernsMode"`
+	// IDMappings is the UIDMapping and GIDMapping used within the container
+	IDMappings *InspectIDMappings `json:"IDMappings,omitempty"`
 	// ShmSize is the size of the container's SHM device.
+
 	ShmSize int64 `json:"ShmSize"`
 	// Runtime is provided purely for Docker compatibility.
 	// It is set unconditionally to "oci" as Podman does not presently