Move configuration work to library

Signed-off-by: jcsiadal <jeremy.c.siadal@intel.com>

Update to support show correctly

Signed-off-by: jcsiadal <jeremy.c.siadal@intel.com>

internal/pkg/configure/ssh.go

@@ -0,0 +1,72 @@
+package configure
+
+import (
+	"fmt"
+	"os"
+	"path"
+
+	"github.com/hpcng/warewulf/internal/pkg/buildconfig"
+	"github.com/hpcng/warewulf/internal/pkg/util"
+	"github.com/hpcng/warewulf/internal/pkg/wwlog"
+	"github.com/pkg/errors"
+)
+
+func configureSSH(show bool) error {
+	if !show {
+		if os.Getuid() == 0 {
+			fmt.Printf("Updating system keys\n")
+
+			wwkeydir := path.Join(buildconfig.SYSCONFDIR(), "warewulf/keys") + "/"
+
+			err := os.MkdirAll(path.Join(buildconfig.SYSCONFDIR(), "warewulf/keys"), 0755)
+			if err != nil {
+				wwlog.Printf(wwlog.ERROR, "Could not create base directory: %s\n", err)
+				os.Exit(1)
+			}
+
+			for _, k := range [4]string{"rsa", "dsa", "ecdsa", "ed25519"} {
+				keytype := "ssh_host_" + k + "_key"
+				if !util.IsFile(path.Join(wwkeydir, keytype)) {
+					fmt.Printf("Setting up key: %s\n", keytype)
+					wwlog.Printf(wwlog.DEBUG, "Creating new %s key\n", keytype)
+					err = util.ExecInteractive("ssh-keygen", "-q", "-t", k, "-f", path.Join(wwkeydir, keytype), "-C", "", "-N", "")
+					if err != nil {
+						wwlog.Printf(wwlog.ERROR, "Failed to exec ssh-keygen: %s\n", err)
+						return errors.Wrap(err, "failed to exec ssh-keygen command")
+					}
+				} else {
+					fmt.Printf("Skipping, key already exists: %s\n", keytype)
+				}
+			}
+		} else {
+			fmt.Printf("Updating user's keys\n")
+		}
+
+		homeDir, err := os.UserHomeDir()
+		if err != nil {
+			wwlog.Printf(wwlog.ERROR, "Could not obtain the user's home directory: %s\n", err)
+			os.Exit(1)
+		}
+
+		authorizedKeys := path.Join(homeDir, "/.ssh/authorized_keys")
+		rsaPriv := path.Join(homeDir, "/.ssh/id_rsa")
+		rsaPub := path.Join(homeDir, "/.ssh/id_rsa.pub")
+
+		if !util.IsFile(authorizedKeys) {
+			fmt.Printf("Setting up: %s\n", authorizedKeys)
+			err = util.ExecInteractive("ssh-keygen", "-q", "-t", "rsa", "-f", rsaPriv, "-C", "", "-N", "")
+			if err != nil {
+				return errors.Wrap(err, "failed to exec ssh-keygen command")
+			}
+			err := util.CopyFile(rsaPub, authorizedKeys)
+			if err != nil {
+				return errors.Wrap(err, "failed to copy keys")
+			}
+		} else {
+			fmt.Printf("Skipping, authorized_keys already exists: %s\n", authorizedKeys)
+		}
+	} else {
+		fmt.Printf("'ssh -s' is not yet implemented.\n")
+	}
+	return nil
+}