buildah/pkg/cli/common.go

package cli

// the cli package contains urfave/cli related structs that help make up
// the command line for buildah commands. it resides here so other projects
// that vendor in this code can use them too.

import (
	"fmt"
	"os"
	"runtime"
	"strings"

	"github.com/containers/buildah/define"
	"github.com/containers/buildah/pkg/completion"
	"github.com/containers/buildah/pkg/parse"
	commonComp "github.com/containers/common/pkg/completion"
	"github.com/containers/common/pkg/config"
	"github.com/containers/storage/pkg/unshare"
	"github.com/opencontainers/runtime-spec/specs-go"
	"github.com/spf13/pflag"
)

// LayerResults represents the results of the layer flags
type LayerResults struct {
	ForceRm bool
	Layers  bool
}

// UserNSResults represents the results for the UserNS flags
type UserNSResults struct {
	UserNS            string
	UserNSUIDMap      []string
	UserNSGIDMap      []string
	UserNSUIDMapUser  string
	UserNSGIDMapGroup string
}

// NameSpaceResults represents the results for Namespace flags
type NameSpaceResults struct {
	Cgroup        string
	IPC           string
	Network       string
	CNIConfigDir  string
	CNIPlugInPath string
	PID           string
	UTS           string
}

// BudResults represents the results for Build flags
type BudResults struct {
	AllPlatforms        bool
	Annotation          []string
	Authfile            string
	BuildArg            []string
	BuildContext        []string
	CacheFrom           string
	CacheTo             string
	CacheTTL            string
	CertDir             string
	Compress            bool
	Creds               string
	CPPFlags            []string
	DisableCompression  bool
	DisableContentTrust bool
	IgnoreFile          string
	File                []string
	Format              string
	From                string
	Iidfile             string
	Label               []string
	Logfile             string
	LogSplitByPlatform  bool
	Manifest            string
	NoHosts             bool
	NoCache             bool
	Timestamp           int64
	OmitHistory         bool
	OCIHooksDir         []string
	Pull                string
	PullAlways          bool
	PullNever           bool
	Quiet               bool
	IdentityLabel       bool
	Rm                  bool
	Runtime             string
	RuntimeFlags        []string
	Secrets             []string
	SSH                 []string
	SignaturePolicy     string
	SignBy              string
	Squash              bool
	Stdin               bool
	Tag                 []string
	BuildOutput         string
	Target              string
	TLSVerify           bool
	Jobs                int
	LogRusage           bool
	RusageLogFile       string
	UnsetEnvs           []string
	Envs                []string
	OSFeatures          []string
	OSVersion           string
}

// FromAndBugResults represents the results for common flags
// in build and from
type FromAndBudResults struct {
	AddHost        []string
	BlobCache      string
	CapAdd         []string
	CapDrop        []string
	CgroupParent   string
	CPUPeriod      uint64
	CPUQuota       int64
	CPUSetCPUs     string
	CPUSetMems     string
	CPUShares      uint64
	DecryptionKeys []string
	Devices        []string
	DNSSearch      []string
	DNSServers     []string
	DNSOptions     []string
	HTTPProxy      bool
	Isolation      string
	Memory         string
	MemorySwap     string
	SecurityOpt    []string
	ShmSize        string
	Ulimit         []string
	Volumes        []string
}

// GetUserNSFlags returns the common flags for usernamespace
func GetUserNSFlags(flags *UserNSResults) pflag.FlagSet {
	usernsFlags := pflag.FlagSet{}
	usernsFlags.StringVar(&flags.UserNS, "userns", "", "'container', `path` of user namespace to join, or 'host'")
	usernsFlags.StringSliceVar(&flags.UserNSUIDMap, "userns-uid-map", []string{}, "`containerUID:hostUID:length` UID mapping to use in user namespace")
	usernsFlags.StringSliceVar(&flags.UserNSGIDMap, "userns-gid-map", []string{}, "`containerGID:hostGID:length` GID mapping to use in user namespace")
	usernsFlags.StringVar(&flags.UserNSUIDMapUser, "userns-uid-map-user", "", "`name` of entries from /etc/subuid to use to set user namespace UID mapping")
	usernsFlags.StringVar(&flags.UserNSGIDMapGroup, "userns-gid-map-group", "", "`name` of entries from /etc/subgid to use to set user namespace GID mapping")
	return usernsFlags
}

// GetUserNSFlagsCompletions returns the FlagCompletions for the userns flags
func GetUserNSFlagsCompletions() commonComp.FlagCompletions {
	flagCompletion := commonComp.FlagCompletions{}
	flagCompletion["userns"] = completion.AutocompleteNamespaceFlag
	flagCompletion["userns-uid-map"] = commonComp.AutocompleteNone
	flagCompletion["userns-gid-map"] = commonComp.AutocompleteNone
	flagCompletion["userns-uid-map-user"] = commonComp.AutocompleteSubuidName
	flagCompletion["userns-gid-map-group"] = commonComp.AutocompleteSubgidName
	return flagCompletion
}

// GetNameSpaceFlags returns the common flags for a namespace menu
func GetNameSpaceFlags(flags *NameSpaceResults) pflag.FlagSet {
	fs := pflag.FlagSet{}
	fs.StringVar(&flags.Cgroup, "cgroupns", "", "'private', or 'host'")
	fs.StringVar(&flags.IPC, string(specs.IPCNamespace), "", "'private', `path` of IPC namespace to join, or 'host'")
	fs.StringVar(&flags.Network, string(specs.NetworkNamespace), "", "'private', 'none', 'ns:path' of network namespace to join, or 'host'")
	fs.StringVar(&flags.CNIConfigDir, "cni-config-dir", "", "`directory` of CNI configuration files")
	_ = fs.MarkHidden("cni-config-dir")
	fs.StringVar(&flags.CNIPlugInPath, "cni-plugin-path", "", "`path` of CNI network plugins")
	_ = fs.MarkHidden("cni-plugin-path")
	fs.StringVar(&flags.PID, string(specs.PIDNamespace), "", "private, `path` of PID namespace to join, or 'host'")
	fs.StringVar(&flags.UTS, string(specs.UTSNamespace), "", "private, :`path` of UTS namespace to join, or 'host'")
	return fs
}

// GetNameSpaceFlagsCompletions returns the FlagCompletions for the namespace flags
func GetNameSpaceFlagsCompletions() commonComp.FlagCompletions {
	flagCompletion := commonComp.FlagCompletions{}
	flagCompletion["cgroupns"] = completion.AutocompleteNamespaceFlag
	flagCompletion[string(specs.IPCNamespace)] = completion.AutocompleteNamespaceFlag
	flagCompletion[string(specs.NetworkNamespace)] = completion.AutocompleteNamespaceFlag
	flagCompletion[string(specs.PIDNamespace)] = completion.AutocompleteNamespaceFlag
	flagCompletion[string(specs.UTSNamespace)] = completion.AutocompleteNamespaceFlag
	return flagCompletion
}

// GetLayerFlags returns the common flags for layers
func GetLayerFlags(flags *LayerResults) pflag.FlagSet {
	fs := pflag.FlagSet{}
	fs.BoolVar(&flags.ForceRm, "force-rm", false, "always remove intermediate containers after a build, even if the build is unsuccessful.")
	fs.BoolVar(&flags.Layers, "layers", UseLayers(), "cache intermediate layers during build. Use BUILDAH_LAYERS environment variable to override.")
	return fs
}

// Note: GetLayerFlagsCompletion is not needed since GetLayerFlags only contains bool flags

// GetBudFlags returns common build flags
func GetBudFlags(flags *BudResults) pflag.FlagSet {
	fs := pflag.FlagSet{}
	fs.BoolVar(&flags.AllPlatforms, "all-platforms", false, "attempt to build for all base image platforms")
	fs.String("arch", runtime.GOARCH, "set the ARCH of the image to the provided value instead of the architecture of the host")
	fs.StringArrayVar(&flags.Annotation, "annotation", []string{}, "set metadata for an image (default [])")
	fs.StringVar(&flags.Authfile, "authfile", "", "path of the authentication file.")
	fs.StringArrayVar(&flags.OCIHooksDir, "hooks-dir", []string{}, "set the OCI hooks directory path (may be set multiple times)")
	fs.StringArrayVar(&flags.BuildArg, "build-arg", []string{}, "`argument=value` to supply to the builder")
	fs.StringArrayVar(&flags.BuildContext, "build-context", []string{}, "`argument=value` to supply additional build context to the builder")
	fs.StringVar(&flags.CacheFrom, "cache-from", "", "remote repository to utilise as potential cache source.")
	fs.StringVar(&flags.CacheTo, "cache-to", "", "remote repository to utilise as potential cache destination.")
	fs.StringVar(&flags.CacheTTL, "cache-ttl", "", "only consider cache images under specified duration.")
	fs.StringVar(&flags.CertDir, "cert-dir", "", "use certificates at the specified path to access the registry")
	fs.BoolVar(&flags.Compress, "compress", false, "this is a legacy option, which has no effect on the image")
	fs.StringArrayVar(&flags.CPPFlags, "cpp-flag", []string{}, "set additional flag to pass to C preprocessor (cpp)")
	fs.StringVar(&flags.Creds, "creds", "", "use `[username[:password]]` for accessing the registry")
	fs.BoolVarP(&flags.DisableCompression, "disable-compression", "D", true, "don't compress layers by default")
	fs.BoolVar(&flags.DisableContentTrust, "disable-content-trust", false, "this is a Docker specific option and is a NOOP")
	fs.StringArrayVar(&flags.Envs, "env", []string{}, "set environment variable for the image")
	fs.StringVar(&flags.From, "from", "", "image name used to replace the value in the first FROM instruction in the Containerfile")
	fs.StringVar(&flags.IgnoreFile, "ignorefile", "", "path to an alternate .dockerignore file")
	fs.StringSliceVarP(&flags.File, "file", "f", []string{}, "`pathname or URL` of a Dockerfile")
	fs.StringVar(&flags.Format, "format", DefaultFormat(), "`format` of the built image's manifest and metadata. Use BUILDAH_FORMAT environment variable to override.")
	fs.StringVar(&flags.Iidfile, "iidfile", "", "`file` to write the image ID to")
	fs.IntVar(&flags.Jobs, "jobs", 1, "how many stages to run in parallel")
	fs.StringArrayVar(&flags.Label, "label", []string{}, "set metadata for an image (default [])")
	fs.StringVar(&flags.Logfile, "logfile", "", "log to `file` instead of stdout/stderr")
	fs.BoolVar(&flags.LogSplitByPlatform, "logsplit", false, "split logfile to different files for each platform")
	fs.Int("loglevel", 0, "NO LONGER USED, flag ignored, and hidden")
	if err := fs.MarkHidden("loglevel"); err != nil {
		panic(fmt.Sprintf("error marking the loglevel flag as hidden: %v", err))
	}
	fs.BoolVar(&flags.LogRusage, "log-rusage", false, "log resource usage at each build step")
	if err := fs.MarkHidden("log-rusage"); err != nil {
		panic(fmt.Sprintf("error marking the log-rusage flag as hidden: %v", err))
	}
	fs.StringVar(&flags.RusageLogFile, "rusage-logfile", "", "destination file to which rusage should be logged to instead of stdout (= the default).")
	if err := fs.MarkHidden("rusage-logfile"); err != nil {
		panic(fmt.Sprintf("error marking the rusage-logfile flag as hidden: %v", err))
	}
	fs.StringVar(&flags.Manifest, "manifest", "", "add the image to the specified manifest list. Creates manifest list if it does not exist")
	fs.BoolVar(&flags.NoHosts, "no-hosts", false, "do not create new /etc/hosts files for RUN instructions, use the one from the base image.")
	fs.BoolVar(&flags.NoCache, "no-cache", false, "do not use existing cached images for the container build. Build from the start with a new set of cached layers.")
	fs.String("os", runtime.GOOS, "set the OS to the provided value instead of the current operating system of the host")
	fs.StringArrayVar(&flags.OSFeatures, "os-feature", []string{}, "set required OS `feature` for the target image in addition to values from the base image")
	fs.StringVar(&flags.OSVersion, "os-version", "", "set required OS `version` for the target image instead of the value from the base image")
	fs.StringVar(&flags.Pull, "pull", "true", "pull the image from the registry if newer or not present in store, if false, only pull the image if not present, if always, pull the image even if the named image is present in store, if never, only use the image present in store if available")
	fs.Lookup("pull").NoOptDefVal = "true" //allow `--pull ` to be set to `true` as expected.
	fs.BoolVar(&flags.PullAlways, "pull-always", false, "pull the image even if the named image is present in store")
	if err := fs.MarkHidden("pull-always"); err != nil {
		panic(fmt.Sprintf("error marking the pull-always flag as hidden: %v", err))
	}
	fs.BoolVar(&flags.PullNever, "pull-never", false, "do not pull the image, use the image present in store if available")
	if err := fs.MarkHidden("pull-never"); err != nil {
		panic(fmt.Sprintf("error marking the pull-never flag as hidden: %v", err))
	}
	fs.BoolVarP(&flags.Quiet, "quiet", "q", false, "refrain from announcing build instructions and image read/write progress")
	fs.BoolVar(&flags.OmitHistory, "omit-history", false, "omit build history information from built image")
	fs.BoolVar(&flags.IdentityLabel, "identity-label", true, "add default identity label")
	fs.BoolVar(&flags.Rm, "rm", true, "remove intermediate containers after a successful build")
	// "runtime" definition moved to avoid name collision in podman build.  Defined in cmd/buildah/build.go.
	fs.StringSliceVar(&flags.RuntimeFlags, "runtime-flag", []string{}, "add global flags for the container runtime")
	fs.StringArrayVar(&flags.Secrets, "secret", []string{}, "secret file to expose to the build")
	fs.StringVar(&flags.SignBy, "sign-by", "", "sign the image using a GPG key with the specified `FINGERPRINT`")
	fs.StringVar(&flags.SignaturePolicy, "signature-policy", "", "`pathname` of signature policy file (not usually used)")
	if err := fs.MarkHidden("signature-policy"); err != nil {
		panic(fmt.Sprintf("error marking the signature-policy flag as hidden: %v", err))
	}
	fs.BoolVar(&flags.Squash, "squash", false, "squash newly built layers into a single new layer")
	fs.StringArrayVar(&flags.SSH, "ssh", []string{}, "SSH agent socket or keys to expose to the build. (format: default|<id>[=<socket>|<key>[,<key>]])")
	fs.BoolVar(&flags.Stdin, "stdin", false, "pass stdin into containers")
	fs.StringArrayVarP(&flags.Tag, "tag", "t", []string{}, "tagged `name` to apply to the built image")
	fs.StringVarP(&flags.BuildOutput, "output", "o", "", "output destination (format: type=local,dest=path)")
	fs.StringVar(&flags.Target, "target", "", "set the target build stage to build")
	fs.Int64Var(&flags.Timestamp, "timestamp", 0, "set created timestamp to the specified epoch seconds to allow for deterministic builds, defaults to current time")
	fs.BoolVar(&flags.TLSVerify, "tls-verify", true, "require HTTPS and verify certificates when accessing the registry")
	fs.String("variant", "", "override the `variant` of the specified image")
	fs.StringSliceVar(&flags.UnsetEnvs, "unsetenv", nil, "unset environment variable from final image")
	return fs
}

// GetBudFlagsCompletions returns the FlagCompletions for the common build flags
func GetBudFlagsCompletions() commonComp.FlagCompletions {
	flagCompletion := commonComp.FlagCompletions{}
	flagCompletion["annotation"] = commonComp.AutocompleteNone
	flagCompletion["arch"] = commonComp.AutocompleteNone
	flagCompletion["authfile"] = commonComp.AutocompleteDefault
	flagCompletion["build-arg"] = commonComp.AutocompleteNone
	flagCompletion["build-context"] = commonComp.AutocompleteNone
	flagCompletion["cache-from"] = commonComp.AutocompleteNone
	flagCompletion["cache-to"] = commonComp.AutocompleteNone
	flagCompletion["cache-ttl"] = commonComp.AutocompleteNone
	flagCompletion["cert-dir"] = commonComp.AutocompleteDefault
	flagCompletion["cpp-flag"] = commonComp.AutocompleteNone
	flagCompletion["creds"] = commonComp.AutocompleteNone
	flagCompletion["env"] = commonComp.AutocompleteNone
	flagCompletion["file"] = commonComp.AutocompleteDefault
	flagCompletion["format"] = commonComp.AutocompleteNone
	flagCompletion["from"] = commonComp.AutocompleteDefault
	flagCompletion["hooks-dir"] = commonComp.AutocompleteNone
	flagCompletion["ignorefile"] = commonComp.AutocompleteDefault
	flagCompletion["iidfile"] = commonComp.AutocompleteDefault
	flagCompletion["jobs"] = commonComp.AutocompleteNone
	flagCompletion["label"] = commonComp.AutocompleteNone
	flagCompletion["logfile"] = commonComp.AutocompleteDefault
	flagCompletion["manifest"] = commonComp.AutocompleteDefault
	flagCompletion["os"] = commonComp.AutocompleteNone
	flagCompletion["os-feature"] = commonComp.AutocompleteNone
	flagCompletion["os-version"] = commonComp.AutocompleteNone
	flagCompletion["output"] = commonComp.AutocompleteNone
	flagCompletion["pull"] = commonComp.AutocompleteDefault
	flagCompletion["runtime-flag"] = commonComp.AutocompleteNone
	flagCompletion["secret"] = commonComp.AutocompleteNone
	flagCompletion["sign-by"] = commonComp.AutocompleteNone
	flagCompletion["signature-policy"] = commonComp.AutocompleteNone
	flagCompletion["ssh"] = commonComp.AutocompleteNone
	flagCompletion["tag"] = commonComp.AutocompleteNone
	flagCompletion["target"] = commonComp.AutocompleteNone
	flagCompletion["timestamp"] = commonComp.AutocompleteNone
	flagCompletion["unsetenv"] = commonComp.AutocompleteNone
	flagCompletion["variant"] = commonComp.AutocompleteNone
	return flagCompletion
}

// GetFromAndBudFlags returns from and build flags
func GetFromAndBudFlags(flags *FromAndBudResults, usernsResults *UserNSResults, namespaceResults *NameSpaceResults) (pflag.FlagSet, error) {
	fs := pflag.FlagSet{}
	defaultContainerConfig, err := config.Default()
	if err != nil {
		return fs, fmt.Errorf("failed to get container config: %w", err)
	}

	fs.StringSliceVar(&flags.AddHost, "add-host", []string{}, "add a custom host-to-IP mapping (`host:ip`) (default [])")
	fs.StringVar(&flags.BlobCache, "blob-cache", "", "assume image blobs in the specified directory will be available for pushing")
	if err := fs.MarkHidden("blob-cache"); err != nil {
		panic(fmt.Sprintf("error marking net flag as hidden: %v", err))
	}
	fs.StringSliceVar(&flags.CapAdd, "cap-add", []string{}, "add the specified capability when running (default [])")
	fs.StringSliceVar(&flags.CapDrop, "cap-drop", []string{}, "drop the specified capability when running (default [])")
	fs.StringVar(&flags.CgroupParent, "cgroup-parent", "", "optional parent cgroup for the container")
	fs.Uint64Var(&flags.CPUPeriod, "cpu-period", 0, "limit the CPU CFS (Completely Fair Scheduler) period")
	fs.Int64Var(&flags.CPUQuota, "cpu-quota", 0, "limit the CPU CFS (Completely Fair Scheduler) quota")
	fs.Uint64VarP(&flags.CPUShares, "cpu-shares", "c", 0, "CPU shares (relative weight)")
	fs.StringVar(&flags.CPUSetCPUs, "cpuset-cpus", "", "CPUs in which to allow execution (0-3, 0,1)")
	fs.StringVar(&flags.CPUSetMems, "cpuset-mems", "", "memory nodes (MEMs) in which to allow execution (0-3, 0,1). Only effective on NUMA systems.")
	fs.StringSliceVar(&flags.DecryptionKeys, "decryption-key", nil, "key needed to decrypt the image")
	fs.StringArrayVar(&flags.Devices, "device", defaultContainerConfig.Containers.Devices, "additional devices to be used within containers (default [])")
	fs.StringSliceVar(&flags.DNSSearch, "dns-search", defaultContainerConfig.Containers.DNSSearches, "set custom DNS search domains")
	fs.StringSliceVar(&flags.DNSServers, "dns", defaultContainerConfig.Containers.DNSServers, "set custom DNS servers or disable it completely by setting it to 'none', which prevents the automatic creation of `/etc/resolv.conf`.")
	fs.StringSliceVar(&flags.DNSOptions, "dns-option", defaultContainerConfig.Containers.DNSOptions, "set custom DNS options")
	fs.BoolVar(&flags.HTTPProxy, "http-proxy", true, "pass through HTTP Proxy environment variables")
	fs.StringVar(&flags.Isolation, "isolation", DefaultIsolation(), "`type` of process isolation to use. Use BUILDAH_ISOLATION environment variable to override.")
	fs.StringVarP(&flags.Memory, "memory", "m", "", "memory limit (format: <number>[<unit>], where unit = b, k, m or g)")
	fs.StringVar(&flags.MemorySwap, "memory-swap", "", "swap limit equal to memory plus swap: '-1' to enable unlimited swap")
	fs.String("arch", runtime.GOARCH, "set the ARCH of the image to the provided value instead of the architecture of the host")
	fs.String("os", runtime.GOOS, "prefer `OS` instead of the running OS when pulling images")
	fs.StringSlice("platform", []string{parse.DefaultPlatform()}, "set the OS/ARCH/VARIANT of the image to the provided value instead of the current operating system and architecture of the host (for example `linux/arm`)")
	fs.String("variant", "", "override the `variant` of the specified image")
	fs.StringArrayVar(&flags.SecurityOpt, "security-opt", []string{}, "security options (default [])")
	fs.StringVar(&flags.ShmSize, "shm-size", defaultContainerConfig.Containers.ShmSize, "size of '/dev/shm'. The format is `<number><unit>`.")
	fs.StringSliceVar(&flags.Ulimit, "ulimit", defaultContainerConfig.Containers.DefaultUlimits, "ulimit options")
	fs.StringArrayVarP(&flags.Volumes, "volume", "v", defaultContainerConfig.Containers.Volumes, "bind mount a volume into the container")

	// Add in the usernamespace and namespaceflags
	usernsFlags := GetUserNSFlags(usernsResults)
	namespaceFlags := GetNameSpaceFlags(namespaceResults)
	fs.AddFlagSet(&usernsFlags)
	fs.AddFlagSet(&namespaceFlags)

	return fs, nil
}

// GetFromAndBudFlagsCompletions returns the FlagCompletions for the from and build flags
func GetFromAndBudFlagsCompletions() commonComp.FlagCompletions {
	flagCompletion := commonComp.FlagCompletions{}
	flagCompletion["arch"] = commonComp.AutocompleteNone
	flagCompletion["add-host"] = commonComp.AutocompleteNone
	flagCompletion["blob-cache"] = commonComp.AutocompleteNone
	flagCompletion["cap-add"] = commonComp.AutocompleteCapabilities
	flagCompletion["cap-drop"] = commonComp.AutocompleteCapabilities
	flagCompletion["cgroup-parent"] = commonComp.AutocompleteDefault // FIXME: This would be a path right?!
	flagCompletion["cpu-period"] = commonComp.AutocompleteNone
	flagCompletion["cpu-quota"] = commonComp.AutocompleteNone
	flagCompletion["cpu-shares"] = commonComp.AutocompleteNone
	flagCompletion["cpuset-cpus"] = commonComp.AutocompleteNone
	flagCompletion["cpuset-mems"] = commonComp.AutocompleteNone
	flagCompletion["decryption-key"] = commonComp.AutocompleteNone
	flagCompletion["device"] = commonComp.AutocompleteDefault
	flagCompletion["dns-search"] = commonComp.AutocompleteNone
	flagCompletion["dns"] = commonComp.AutocompleteNone
	flagCompletion["dns-option"] = commonComp.AutocompleteNone
	flagCompletion["isolation"] = commonComp.AutocompleteNone
	flagCompletion["memory"] = commonComp.AutocompleteNone
	flagCompletion["memory-swap"] = commonComp.AutocompleteNone
	flagCompletion["os"] = commonComp.AutocompleteNone
	flagCompletion["platform"] = commonComp.AutocompleteNone
	flagCompletion["security-opt"] = commonComp.AutocompleteNone
	flagCompletion["shm-size"] = commonComp.AutocompleteNone
	flagCompletion["ulimit"] = commonComp.AutocompleteNone
	flagCompletion["volume"] = commonComp.AutocompleteDefault
	flagCompletion["variant"] = commonComp.AutocompleteNone

	// Add in the usernamespace and namespace flag completions
	userNsComp := GetUserNSFlagsCompletions()
	for name, comp := range userNsComp {
		flagCompletion[name] = comp
	}
	namespaceComp := GetNameSpaceFlagsCompletions()
	for name, comp := range namespaceComp {
		flagCompletion[name] = comp
	}

	return flagCompletion
}

// UseLayers returns true if BUILDAH_LAYERS is set to "1" or "true"
// otherwise it returns false
func UseLayers() bool {
	layers := os.Getenv("BUILDAH_LAYERS")
	if strings.ToLower(layers) == "true" || layers == "1" {
		return true
	}
	return false
}

// DefaultFormat returns the default image format
func DefaultFormat() string {
	format := os.Getenv("BUILDAH_FORMAT")
	if format != "" {
		return format
	}
	return define.OCI
}

// DefaultIsolation returns the default image format
func DefaultIsolation() string {
	isolation := os.Getenv("BUILDAH_ISOLATION")
	if isolation != "" {
		return isolation
	}
	if unshare.IsRootless() {
		return "rootless"
	}
	return define.OCI
}

// DefaultHistory returns the default add-history setting
func DefaultHistory() bool {
	history := os.Getenv("BUILDAH_HISTORY")
	if strings.ToLower(history) == "true" || history == "1" {
		return true
	}
	return false
}

func VerifyFlagsArgsOrder(args []string) error {
	for _, arg := range args {
		if strings.HasPrefix(arg, "-") {
			return fmt.Errorf("no options (%s) can be specified after the image or container name", arg)
		}
	}
	return nil
}

// AliasFlags is a function to handle backwards compatibility with old flags
func AliasFlags(f *pflag.FlagSet, name string) pflag.NormalizedName {
	switch name {
	case "net":
		name = "network"
	case "override-arch":
		name = "arch"
	case "override-os":
		name = "os"
	case "purge":
		name = "rm"
	case "tty":
		name = "terminal"
	}
	return pflag.NormalizedName(name)
}