Default Authfile to proper path

cmd/buildah/commit.go

@@ -55,7 +55,7 @@ func init() {
 	flags := commitCommand.Flags()
 	flags.SetInterspersed(false)
 
-	flags.StringVar(&opts.authfile, "authfile", "", "path of the authentication file. Default is ${XDG_RUNTIME_DIR}/containers/auth.json")
+	flags.StringVar(&opts.authfile, "authfile", buildahcli.GetDefaultAuthFile(), "path of the authentication file. Use REGISTRY_AUTH_FILE environment variable to override")
 	flags.StringVar(&opts.blobCache, "blob-cache", "", "assume image blobs in the specified directory will be available for pushing")
 
 	flags.MarkHidden("blob-cache")

cmd/buildah/from.go

@@ -58,7 +58,7 @@ func init() {
 
 	flags := fromCommand.Flags()
 	flags.SetInterspersed(false)
-	flags.StringVar(&opts.authfile, "authfile", "", "path of the authentication file. Default is ${XDG_RUNTIME_DIR}/containers/auth.json")
+	flags.StringVar(&opts.authfile, "authfile", buildahcli.GetDefaultAuthFile(), "path of the authentication file. Use REGISTRY_AUTH_FILE environment variable to override")
 	flags.StringVar(&opts.certDir, "cert-dir", "", "use certificates at the specified path to access the registry")
 	flags.StringVar(&opts.cidfile, "cidfile", "", "write the container ID to the file")
 	flags.StringVar(&opts.creds, "creds", "", "use `[username[:password]]` for accessing the registry")

cmd/buildah/login.go

@@ -6,6 +6,7 @@ import (
 	"os"
 	"strings"
 
+	buildahcli "github.com/containers/buildah/pkg/cli"
 	"github.com/containers/buildah/pkg/parse"
 	"github.com/containers/image/docker"
 	"github.com/containers/image/pkg/docker/config"
@@ -42,7 +43,7 @@ func init() {
 
 	flags := loginCommand.Flags()
 	flags.SetInterspersed(false)
-	flags.StringVar(&opts.authfile, "authfile", "", "path of the authentication file. Default is ${XDG_RUNTIME_DIR}/containers/auth.json. Use REGISTRY_AUTH_FILE environment variable to override")
+	flags.StringVar(&opts.authfile, "authfile", buildahcli.GetDefaultAuthFile(), "path of the authentication file. Use REGISTRY_AUTH_FILE environment variable to override")
 	flags.StringVar(&opts.certDir, "cert-dir", "", "use certificates at the specified path to access the registry")
 	flags.StringVarP(&opts.password, "password", "p", "", "Password for registry")
 	flags.BoolVar(&opts.tlsVerify, "tls-verify", true, "require HTTPS and verify certificates when accessing the registry")

cmd/buildah/logout.go

@@ -3,6 +3,7 @@ package main
 import (
 	"fmt"
 
+	buildahcli "github.com/containers/buildah/pkg/cli"
 	"github.com/containers/buildah/pkg/parse"
 	"github.com/containers/image/pkg/docker/config"
 	"github.com/pkg/errors"
@@ -32,7 +33,7 @@ func init() {
 
 	flags := logoutCommand.Flags()
 	flags.SetInterspersed(false)
-	flags.StringVar(&opts.authfile, "authfile", "", "path of the authentication file. Default is ${XDG_RUNTIME_DIR}/containers/auth.json. Use REGISTRY_AUTH_FILE environment variable to override")
+	flags.StringVar(&opts.authfile, "authfile", buildahcli.GetDefaultAuthFile(), "path of the authentication file. Use REGISTRY_AUTH_FILE environment variable to override")
 	flags.BoolVarP(&opts.all, "all", "a", false, "Remove the cached credentials for all registries in the auth file")
 	rootCmd.AddCommand(logoutCommand)
 }

cmd/buildah/pull.go

@@ -46,7 +46,7 @@ func init() {
 	flags := pullCommand.Flags()
 	flags.SetInterspersed(false)
 	flags.BoolVarP(&opts.allTags, "all-tags", "a", false, "download all tagged images in the repository")
-	flags.StringVar(&opts.authfile, "authfile", "", "path of the authentication file. Default is ${XDG_RUNTIME_DIR}/containers/auth.json")
+	flags.StringVar(&opts.authfile, "authfile", buildahcli.GetDefaultAuthFile(), "path of the authentication file. Use REGISTRY_AUTH_FILE environment variable to override")
 	flags.StringVar(&opts.blobCache, "blob-cache", "", "store copies of pulled image blobs in the specified directory")
 	flags.StringVar(&opts.certDir, "cert-dir", "", "use certificates at the specified path to access the registry")
 	flags.StringVar(&opts.creds, "creds", "", "use `[username[:password]]` for accessing the registry")

cmd/buildah/push.go

@@ -61,7 +61,7 @@ func init() {
 
 	flags := pushCommand.Flags()
 	flags.SetInterspersed(false)
-	flags.StringVar(&opts.authfile, "authfile", "", "path of the authentication file. Default is ${XDG_RUNTIME_DIR}/containers/auth.json")
+	flags.StringVar(&opts.authfile, "authfile", buildahcli.GetDefaultAuthFile(), "path of the authentication file. Use REGISTRY_AUTH_FILE environment variable to override")
 	flags.StringVar(&opts.blobCache, "blob-cache", "", "assume image blobs in the specified directory will be available for pushing")
 	flags.StringVar(&opts.certDir, "cert-dir", "", "use certificates at the specified path to access the registry")
 	flags.StringVar(&opts.creds, "creds", "", "use `[username[:password]]` for accessing the registry")

pkg/cli/common.go

@@ -7,6 +7,7 @@ package cli
 import (
 	"fmt"
 	"os"
+	"path/filepath"
 	"strings"
 
 	"github.com/containers/buildah"
@@ -137,7 +138,7 @@ func GetLayerFlags(flags *LayerResults) pflag.FlagSet {
 func GetBudFlags(flags *BudResults) pflag.FlagSet {
 	fs := pflag.FlagSet{}
 	fs.StringArrayVar(&flags.Annotation, "annotation", []string{}, "Set metadata for an image (default [])")
-	fs.StringVar(&flags.Authfile, "authfile", "", "path of the authentication file. Default is ${XDG_RUNTIME_DIR}/containers/auth.json")
+	fs.StringVar(&flags.Authfile, "authfile", GetDefaultAuthFile(), "path of the authentication file.")
 	fs.StringArrayVar(&flags.BuildArg, "build-arg", []string{}, "`argument=value` to supply to the builder")
 	fs.StringVar(&flags.CacheFrom, "cache-from", "", "Images to utilise as potential cache sources. The build process does not currently support caching so this is a NOOP.")
 	fs.StringVar(&flags.CertDir, "cert-dir", "", "use certificates at the specified path to access the registry")
@@ -246,3 +247,15 @@ func VerifyFlagsArgsOrder(args []string) error {
 	}
 	return nil
 }
+
+func GetDefaultAuthFile() string {
+	authfile := os.Getenv("REGISTRY_AUTH_FILE")
+	if authfile != "" {
+		return authfile
+	}
+	runtimeDir := os.Getenv("XDG_RUNTIME_DIR")
+	if runtimeDir != "" {
+		return filepath.Join(runtimeDir, "containers/auth.json")
+	}
+	return ""
+}