v2: implement log{in,out}

Implement podman login and logout.  Smoke tests were successful but the
system tests are currently failing as we seem unable to run a registry
at the moment.

Signed-off-by: Valentin Rothberg <rothberg@redhat.com>

vendor/github.com/containers/common/pkg/auth/cli.go

@@ -0,0 +1,47 @@
+package auth
+
+import (
+	"io"
+
+	"github.com/spf13/pflag"
+)
+
+// LoginOptions represents common flags in login
+// caller should define bool or optionalBool fields for flags --get-login and --tls-verify
+type LoginOptions struct {
+	AuthFile      string
+	CertDir       string
+	GetLoginSet   bool
+	Password      string
+	Username      string
+	StdinPassword bool
+	Stdin         io.Reader
+	Stdout        io.Writer
+}
+
+// LogoutOptions represents the results for flags in logout
+type LogoutOptions struct {
+	AuthFile string
+	All      bool
+	Stdin    io.Reader
+	Stdout   io.Writer
+}
+
+// GetLoginFlags defines and returns login flags for containers tools
+func GetLoginFlags(flags *LoginOptions) *pflag.FlagSet {
+	fs := pflag.FlagSet{}
+	fs.StringVar(&flags.AuthFile, "authfile", GetDefaultAuthFile(), "path of the authentication file. Use REGISTRY_AUTH_FILE environment variable to override")
+	fs.StringVar(&flags.CertDir, "cert-dir", "", "use certificates at the specified path to access the registry")
+	fs.StringVarP(&flags.Password, "password", "p", "", "Password for registry")
+	fs.StringVarP(&flags.Username, "username", "u", "", "Username for registry")
+	fs.BoolVar(&flags.StdinPassword, "password-stdin", false, "Take the password from stdin")
+	return &fs
+}
+
+// GetLogoutFlags defines and returns logout flags for containers tools
+func GetLogoutFlags(flags *LogoutOptions) *pflag.FlagSet {
+	fs := pflag.FlagSet{}
+	fs.StringVar(&flags.AuthFile, "authfile", GetDefaultAuthFile(), "path of the authentication file. Use REGISTRY_AUTH_FILE environment variable to override")
+	fs.BoolVarP(&flags.All, "all", "a", false, "Remove the cached credentials for all registries in the auth file")
+	return &fs
+}