V2 Enable rootless

* Enable running podman V2 rootless
* Fixed cobra.PersistentPreRunE usage in all the commands
* Leveraged cobra.PersistentPreRunE/cobra.PersistentPostRunE to manage:
  * rootless
  * trace (--trace)
  * profiling (--cpu-profile)
  * initializing the registry copies of Image/Container engines
* Help and Usage templates autoset for all sub-commands

Signed-off-by: Jhon Honce <jhonce@redhat.com>

7 files changed, 17 insertions, 260 deletions

diff --git a/pkg/domain/entities/engine.go b/pkg/domain/entities/engine.go
index 3b971a1e8..f45218d14 100644
--- a/pkg/domain/entities/engine.go
+++ b/pkg/domain/entities/engine.go
@@ -2,17 +2,9 @@ package entities
 
 import (
 	"context"
-	"fmt"
 	"io"
-	"os"
 
-	"github.com/containers/buildah/pkg/parse"
 	"github.com/containers/common/pkg/config"
-	"github.com/containers/common/pkg/sysinfo"
-	"github.com/containers/libpod/pkg/apparmor"
-	"github.com/containers/libpod/pkg/cgroups"
-	"github.com/containers/libpod/pkg/rootless"
-	"github.com/opencontainers/selinux/go-selinux"
 	"github.com/opentracing/opentracing-go"
 	"github.com/spf13/pflag"
 )
@@ -54,214 +46,3 @@ type PodmanConfig struct {
 	StorageDriver string
 	StorageOpts   []string
 }
-
-// DefaultSecurityOptions: getter for security options from configuration
-func (c PodmanConfig) DefaultSecurityOptions() []string {
-	securityOpts := []string{}
-	if c.Containers.SeccompProfile != "" && c.Containers.SeccompProfile != parse.SeccompDefaultPath {
-		securityOpts = append(securityOpts, fmt.Sprintf("seccomp=%s", c.Containers.SeccompProfile))
-	}
-	if apparmor.IsEnabled() && c.Containers.ApparmorProfile != "" {
-		securityOpts = append(securityOpts, fmt.Sprintf("apparmor=%s", c.Containers.ApparmorProfile))
-	}
-	if selinux.GetEnabled() && !c.Containers.EnableLabeling {
-		securityOpts = append(securityOpts, fmt.Sprintf("label=%s", selinux.DisableSecOpt()[0]))
-	}
-	return securityOpts
-}
-
-// DefaultSysctls
-func (c PodmanConfig) DefaultSysctls() []string {
-	return c.Containers.DefaultSysctls
-}
-
-func (c PodmanConfig) DefaultVolumes() []string {
-	return c.Containers.Volumes
-}
-
-func (c PodmanConfig) DefaultDevices() []string {
-	return c.Containers.Devices
-}
-
-func (c PodmanConfig) DefaultDNSServers() []string {
-	return c.Containers.DNSServers
-}
-
-func (c PodmanConfig) DefaultDNSSearches() []string {
-	return c.Containers.DNSSearches
-}
-
-func (c PodmanConfig) DefaultDNSOptions() []string {
-	return c.Containers.DNSOptions
-}
-
-func (c PodmanConfig) DefaultEnv() []string {
-	return c.Containers.Env
-}
-
-func (c PodmanConfig) DefaultInitPath() string {
-	return c.Containers.InitPath
-}
-
-func (c PodmanConfig) DefaultIPCNS() string {
-	return c.Containers.IPCNS
-}
-
-func (c PodmanConfig) DefaultPidNS() string {
-	return c.Containers.PidNS
-}
-
-func (c PodmanConfig) DefaultNetNS() string {
-	if c.Containers.NetNS == "private" && rootless.IsRootless() {
-		return "slirp4netns"
-	}
-	return c.Containers.NetNS
-}
-
-func (c PodmanConfig) DefaultCgroupNS() string {
-	return c.Containers.CgroupNS
-}
-
-func (c PodmanConfig) DefaultUTSNS() string {
-	return c.Containers.UTSNS
-}
-
-func (c PodmanConfig) DefaultShmSize() string {
-	return c.Containers.ShmSize
-}
-
-func (c PodmanConfig) DefaultUlimits() []string {
-	return c.Containers.DefaultUlimits
-}
-
-func (c PodmanConfig) DefaultUserNS() string {
-	if v, found := os.LookupEnv("PODMAN_USERNS"); found {
-		return v
-	}
-	return c.Containers.UserNS
-}
-
-func (c PodmanConfig) DefaultPidsLimit() int64 {
-	if rootless.IsRootless() {
-		cgroup2, _ := cgroups.IsCgroup2UnifiedMode()
-		if cgroup2 {
-			return c.Containers.PidsLimit
-		}
-	}
-	return sysinfo.GetDefaultPidsLimit()
-}
-
-func (c PodmanConfig) DefaultPidsDescription() string {
-	return "Tune container pids limit (set 0 for unlimited)"
-}
-
-func (c PodmanConfig) DefaultDetachKeys() string {
-	return c.Engine.DetachKeys
-}
-
-// TODO: Remove in rootless support PR
-// // EngineOptions holds the environment for running the engines
-// type EngineOptions struct {
-// 	// Introduced with V2
-// 	Uri         string
-// 	Identities  []string
-// 	FlagSet     *pflag.FlagSet
-// 	EngineMode  EngineMode
-// 	CGroupUsage string
-//
-// 	// Introduced with V1
-// 	CGroupManager     string   // config.EngineConfig
-// 	CniConfigDir      string   // config.NetworkConfig.NetworkConfigDir
-// 	ConmonPath        string   // config.EngineConfig
-// 	DefaultMountsFile string   // config.ContainersConfig
-// 	EventsBackend     string   // config.EngineConfig.EventsLogger
-// 	HooksDir          []string // config.EngineConfig
-// 	MaxWorks          int
-// 	Namespace         string // config.EngineConfig
-// 	Root              string //
-// 	Runroot           string // config.EngineConfig.StorageConfigRunRootSet??
-// 	Runtime           string // config.EngineConfig.OCIRuntime
-// 	StorageDriver     string // config.EngineConfig.StorageConfigGraphDriverNameSet??
-// 	StorageOpts       []string
-// 	Syslog            bool
-// 	Trace             bool
-// 	NetworkCmdPath    string // config.EngineConfig
-//
-// 	Config     string
-// 	CpuProfile string
-// 	LogLevel   string
-// 	TmpDir     string // config.EngineConfig
-//
-// 	RemoteUserName       string // deprecated
-// 	RemoteHost           string // deprecated
-// 	VarlinkAddress       string // deprecated
-// 	ConnectionName       string
-// 	RemoteConfigFilePath string
-// 	Port                 int    // deprecated
-// 	IdentityFile         string // deprecated
-// 	IgnoreHosts          bool
-// }
-//
-// func NewEngineOptions(opts EngineOptions) (EngineOptions, error) {
-// 	ctnrCfg, err := config.Default()
-// 	if err != nil {
-// 		logrus.Error(err)
-// 		os.Exit(1)
-// 	}
-//
-// 	cgroupManager := ctnrCfg.Engine.CgroupManager
-// 	cgroupUsage := `Cgroup manager to use ("cgroupfs"|"systemd")`
-// 	cgroupv2, _ := cgroups.IsCgroup2UnifiedMode()
-// 	cniPluginDir := ctnrCfg.Network.CNIPluginDirs[0]
-//
-// 	cfg, err := config.NewConfig("")
-// 	if err != nil {
-// 		logrus.Errorf("Error loading container config %v\n", err)
-// 		os.Exit(1)
-// 	}
-// 	cfg.CheckCgroupsAndAdjustConfig()
-//
-// 	if rootless.IsRootless() {
-// 		if !cgroupv2 {
-// 			cgroupManager = ""
-// 			cgroupUsage = "Cgroup manager is not supported in rootless mode"
-// 		}
-// 		cniPluginDir = ""
-// 	}
-//
-// 	return EngineOptions{
-// 		CGroupManager:        cgroupManager,
-// 		CGroupUsage:          cgroupUsage,
-// 		CniConfigDir:         cniPluginDir,
-// 		Config:               opts.Config, // TODO: deprecate
-// 		ConmonPath:           opts.ConmonPath,
-// 		ConnectionName:       opts.ConnectionName,
-// 		CpuProfile:           opts.CpuProfile,
-// 		DefaultMountsFile:    ctnrCfg.Containers.DefaultMountsFile,
-// 		EngineMode:           opts.EngineMode,
-// 		EventsBackend:        ctnrCfg.Engine.EventsLogger,
-// 		FlagSet:              opts.FlagSet, // TODO: deprecate
-// 		HooksDir:             append(ctnrCfg.Engine.HooksDir[:0:0], ctnrCfg.Engine.HooksDir...),
-// 		Identities:           append(opts.Identities[:0:0], opts.Identities...),
-// 		IdentityFile:         opts.IdentityFile, // TODO: deprecate
-// 		IgnoreHosts:          opts.IgnoreHosts,
-// 		LogLevel:             opts.LogLevel,
-// 		MaxWorks:             opts.MaxWorks,
-// 		Namespace:            ctnrCfg.Engine.Namespace,
-// 		NetworkCmdPath:       ctnrCfg.Engine.NetworkCmdPath,
-// 		Port:                 opts.Port,
-// 		RemoteConfigFilePath: opts.RemoteConfigFilePath,
-// 		RemoteHost:           opts.RemoteHost,     // TODO: deprecate
-// 		RemoteUserName:       opts.RemoteUserName, // TODO: deprecate
-// 		Root:                 opts.Root,
-// 		Runroot:              opts.Runroot,
-// 		Runtime:              opts.Runtime,
-// 		StorageDriver:        opts.StorageDriver,
-// 		StorageOpts:          append(opts.StorageOpts[:0:0], opts.StorageOpts...),
-// 		Syslog:               opts.Syslog,
-// 		TmpDir:               opts.TmpDir,
-// 		Trace:                opts.Trace,
-// 		Uri:                  opts.Uri,
-// 		VarlinkAddress:       opts.VarlinkAddress,
-// 	}, nil
-// }
diff --git a/pkg/domain/entities/engine_container.go b/pkg/domain/entities/engine_container.go
index c3092a98a..02938413a 100644
--- a/pkg/domain/entities/engine_container.go
+++ b/pkg/domain/entities/engine_container.go
@@ -6,6 +6,7 @@ import (
 	"github.com/containers/common/pkg/config"
 	"github.com/containers/libpod/libpod/define"
 	"github.com/containers/libpod/pkg/specgen"
+	"github.com/spf13/cobra"
 )
 
 type ContainerEngine interface {
@@ -24,9 +25,9 @@ type ContainerEngine interface {
 	ContainerInspect(ctx context.Context, namesOrIds []string, options InspectOptions) ([]*ContainerInspectReport, error)
 	ContainerKill(ctx context.Context, namesOrIds []string, options KillOptions) ([]*KillReport, error)
 	ContainerList(ctx context.Context, options ContainerListOptions) ([]ListContainer, error)
+	ContainerLogs(ctx context.Context, containers []string, options ContainerLogsOptions) error
 	ContainerMount(ctx context.Context, nameOrIds []string, options ContainerMountOptions) ([]*ContainerMountReport, error)
 	ContainerPause(ctx context.Context, namesOrIds []string, options PauseUnPauseOptions) ([]*PauseUnpauseReport, error)
-	ContainerLogs(ctx context.Context, containers []string, options ContainerLogsOptions) error
 	ContainerRestart(ctx context.Context, namesOrIds []string, options RestartOptions) ([]*RestartReport, error)
 	ContainerRestore(ctx context.Context, namesOrIds []string, options RestoreOptions) ([]*RestoreReport, error)
 	ContainerRm(ctx context.Context, namesOrIds []string, options RmOptions) ([]*RmReport, error)
@@ -53,6 +54,7 @@ type ContainerEngine interface {
 	PodTop(ctx context.Context, options PodTopOptions) (*StringSliceReport, error)
 	PodUnpause(ctx context.Context, namesOrIds []string, options PodunpauseOptions) ([]*PodUnpauseReport, error)
 	RestService(ctx context.Context, opts ServiceOptions) error
+	SetupRootless(ctx context.Context, cmd *cobra.Command) error
 	VarlinkService(ctx context.Context, opts ServiceOptions) error
 	VolumeCreate(ctx context.Context, opts VolumeCreateOptions) (*IdOrNameResponse, error)
 	VolumeInspect(ctx context.Context, namesOrIds []string, opts VolumeInspectOptions) ([]*VolumeInspectReport, error)
diff --git a/pkg/domain/entities/engine_image.go b/pkg/domain/entities/engine_image.go
index 3a051ab9b..e3b606550 100644
--- a/pkg/domain/entities/engine_image.go
+++ b/pkg/domain/entities/engine_image.go
@@ -20,7 +20,7 @@ type ImageEngine interface {
 	Pull(ctx context.Context, rawImage string, opts ImagePullOptions) (*ImagePullReport, error)
 	Push(ctx context.Context, source string, destination string, opts ImagePushOptions) error
 	Save(ctx context.Context, nameOrId string, tags []string, options ImageSaveOptions) error
+	Search(ctx context.Context, term string, opts ImageSearchOptions) ([]ImageSearchReport, error)
 	Tag(ctx context.Context, nameOrId string, tags []string, options ImageTagOptions) error
 	Untag(ctx context.Context, nameOrId string, tags []string, options ImageUntagOptions) error
-	Search(ctx context.Context, term string, opts ImageSearchOptions) ([]ImageSearchReport, error)
 }
diff --git a/pkg/domain/infra/abi/containers.go b/pkg/domain/infra/abi/containers.go
index 4279fb756..c9df72f2d 100644
--- a/pkg/domain/infra/abi/containers.go
+++ b/pkg/domain/infra/abi/containers.go
@@ -668,9 +668,6 @@ func (ic *ContainerEngine) ContainerDiff(ctx context.Context, nameOrId string, o
 }
 
 func (ic *ContainerEngine) ContainerRun(ctx context.Context, opts entities.ContainerRunOptions) (*entities.ContainerRunReport, error) {
-	var (
-		joinPod bool
-	)
 	if err := generate.CompleteSpec(ctx, ic.Libpod, opts.Spec); err != nil {
 		return nil, err
 	}
@@ -679,6 +676,7 @@ func (ic *ContainerEngine) ContainerRun(ctx context.Context, opts entities.Conta
 		return nil, err
 	}
 
+	var joinPod bool
 	if len(ctr.PodID()) > 0 {
 		joinPod = true
 	}
diff --git a/pkg/domain/infra/abi/system.go b/pkg/domain/infra/abi/system.go
index 10872144b..67593b2dd 100644
--- a/pkg/domain/infra/abi/system.go
+++ b/pkg/domain/infra/abi/system.go
@@ -100,7 +100,7 @@ func (ic *ContainerEngine) VarlinkService(_ context.Context, opts entities.Servi
 	return nil
 }
 
-func (ic *ContainerEngine) SetupRootless(cmd *cobra.Command) error {
+func (ic *ContainerEngine) SetupRootless(_ context.Context, cmd *cobra.Command) error {
 	// do it only after podman has already re-execed and running with uid==0.
 	if os.Geteuid() == 0 {
 		ownsCgroup, err := cgroups.UserOwnsCurrentSystemdCgroup()
@@ -123,10 +123,6 @@ func (ic *ContainerEngine) SetupRootless(cmd *cobra.Command) error {
 		}
 	}
 
-	if !executeCommandInUserNS(cmd) {
-		return nil
-	}
-
 	pausePidPath, err := util.GetRootlessPauseProcessPidPath()
 	if err != nil {
 		return errors.Wrapf(err, "could not get pause process pid file path")
@@ -143,7 +139,8 @@ func (ic *ContainerEngine) SetupRootless(cmd *cobra.Command) error {
 	// if there is no pid file, try to join existing containers, and create a pause process.
 	ctrs, err := ic.Libpod.GetRunningContainers()
 	if err != nil {
-		logrus.WithError(err).Fatal("")
+		logrus.Error(err.Error())
+		os.Exit(1)
 	}
 
 	paths := []string{}
@@ -164,7 +161,8 @@ func (ic *ContainerEngine) SetupRootless(cmd *cobra.Command) error {
 		}
 	}
 	if err != nil {
-		logrus.WithError(err).Fatal("")
+		logrus.Error(err)
+		os.Exit(1)
 	}
 	if became {
 		os.Exit(ret)
@@ -172,25 +170,6 @@ func (ic *ContainerEngine) SetupRootless(cmd *cobra.Command) error {
 	return nil
 }
 
-// Most podman commands when run in rootless mode, need to be executed in the
-// users usernamespace.  This function is updated with a  list of commands that
-// should NOT be run within the user namespace.
-func executeCommandInUserNS(cmd *cobra.Command) bool {
-	return os.Geteuid() == 0
-	// if os.Geteuid() == 0 {
-	// 	return false
-	// }
-	// switch cmd {
-	// case _migrateCommand,
-	// 	_mountCommand,
-	// 	_renumberCommand,
-	// 	_searchCommand,
-	// 	_versionCommand:
-	// 	return false
-	// }
-	// return true
-}
-
 func movePauseProcessToScope() error {
 	pausePidPath, err := util.GetRootlessPauseProcessPidPath()
 	if err != nil {
@@ -234,11 +213,3 @@ func setUMask() { // nolint:deadcode,unused
 func checkInput() error { // nolint:deadcode,unused
 	return nil
 }
-
-// func getCNIPluginsDir() string {
-// 	if rootless.IsRootless() {
-// 		return ""
-// 	}
-//
-// 	return registry.PodmanOptions.Network.CNIPluginDirs[0]
-// }
diff --git a/pkg/domain/infra/tunnel/system.go b/pkg/domain/infra/tunnel/system.go
index 7c7a55c05..f373525c5 100644
--- a/pkg/domain/infra/tunnel/system.go
+++ b/pkg/domain/infra/tunnel/system.go
@@ -7,6 +7,7 @@ import (
 	"github.com/containers/libpod/libpod/define"
 	"github.com/containers/libpod/pkg/bindings/system"
 	"github.com/containers/libpod/pkg/domain/entities"
+	"github.com/spf13/cobra"
 )
 
 func (ic *ContainerEngine) Info(ctx context.Context) (*define.Info, error) {
@@ -20,3 +21,7 @@ func (ic *ContainerEngine) RestService(_ context.Context, _ entities.ServiceOpti
 func (ic *ContainerEngine) VarlinkService(_ context.Context, _ entities.ServiceOptions) error {
 	panic(errors.New("varlink service is not supported when tunneling"))
 }
+
+func (ic *ContainerEngine) SetupRootless(_ context.Context, cmd *cobra.Command) error {
+	panic(errors.New("rootless engine mode is not supported when tunneling"))
+}
diff --git a/pkg/specgen/namespaces.go b/pkg/specgen/namespaces.go
index 2ef5bc229..2e7f80fe8 100644
--- a/pkg/specgen/namespaces.go
+++ b/pkg/specgen/namespaces.go
@@ -28,9 +28,9 @@ const (
 	// Bridge indicates that a CNI network stack
 	// should be used
 	Bridge NamespaceMode = "bridge"
-	// Slirp indicates that a slirp4ns network stack should
+	// Slirp indicates that a slirp4netns network stack should
 	// be used
-	Slirp NamespaceMode = "slirp4ns"
+	Slirp NamespaceMode = "slirp4netns"
 )
 
 // Namespace describes the namespace