add install function

install pem files directly to an apc ups

pkg/app/config.go

@@ -2,6 +2,7 @@ package app
 
 import (
 	"errors"
+	"os"
 
 	"github.com/peterbourgon/ff/v4"
 )
@@ -18,18 +19,26 @@ type config struct {
 		certPemFilePath *string
 		outFilePath     *string
 	}
+	install struct {
+		keyPemFilePath  *string
+		certPemFilePath *string
+		hostAndPort     *string
+		fingerprint     *string
+		username        *string
+		password        *string
+	}
 }
 
 // getConfig returns the app's configuration from either command line args,
 // or environment variables
-func (app *app) getConfig() {
+func (app *app) getConfig() error {
 	// make config
 	cfg := &config{}
 
 	// commands:
 	// create
+	// install
 	// TODO:
-	// upload
 	// unpack (both key & key+cert)
 
 	// apc-p15-tool -- root command
@@ -61,7 +70,33 @@ func (app *app) getConfig() {
 
 	rootCmd.Subcommands = append(rootCmd.Subcommands, createCmd)
 
-	// set app cmd & cfg
-	app.cmd = rootCmd
+	// install -- subcommand
+	installFlags := ff.NewFlagSet("install").SetParent(rootFlags)
+
+	cfg.install.keyPemFilePath = installFlags.StringLong("keyfile", "", "path and filename of the rsa-2048 key in pem format")
+	cfg.install.certPemFilePath = installFlags.StringLong("certfile", "", "path and filename of the certificate in pem format")
+	cfg.install.hostAndPort = installFlags.StringLong("apchost", "", "hostname:port of the apc ups to install the certificate on")
+	cfg.install.fingerprint = installFlags.StringLong("fingerprint", "", "the SHA256 fingerprint value of the ups' ssh server")
+	cfg.install.username = installFlags.StringLong("username", "", "username to login to the apc ups")
+	cfg.install.password = installFlags.StringLong("password", "", "password to login to the apc ups")
+
+	installCmd := &ff.Command{
+		Name:      "install",
+		Usage:     "apc-p15-tool upload --keyfile key.pem --certfile cert.pem --apchost example.com:22 --fingerprint 123abc --username apc --password test",
+		ShortHelp: "install the specified key and cert pem files on an apc ups (they will be converted to a comaptible p15 file)",
+		Flags:     installFlags,
+		Exec:      app.cmdInstall,
+	}
+
+	rootCmd.Subcommands = append(rootCmd.Subcommands, installCmd)
+
+	// set cfg & parse
 	app.config = cfg
+	app.cmd = rootCmd
+	err := app.cmd.Parse(os.Args[1:], ff.WithEnvVarPrefix(environmentVarPrefix))
+	if err != nil {
+		return err
+	}
+
+	return nil
 }