add option to skip loading config file

config.go

@@ -29,14 +29,15 @@ import (
 	_ "embed"
 	"errors"
 	"fmt"
-	"github.com/anmitsu/go-shlex"
-	"github.com/spf13/pflag"
-	"gopkg.in/ini.v1"
 	"os"
 	"runtime"
 	"strconv"
 	"strings"
 	"time"
+
+	"github.com/anmitsu/go-shlex"
+	"github.com/spf13/pflag"
+	"gopkg.in/ini.v1"
 )
 
 var defaultCfgFile = "/etc/pg_back/pg_back.conf"
@@ -46,6 +47,7 @@ var defaultCfg string
 
 // options struct holds command line and configuration file options
 type options struct {
+	NoConfigFile     bool
 	BinDirectory     string
 	Directory        string
 	Host             string
@@ -112,6 +114,7 @@ func defaultOptions() options {
 	}
 
 	return options{
+		NoConfigFile:  false,
 		Directory:     "/var/backups/postgresql",
 		Format:        'c',
 		DirJobs:       1,
@@ -245,6 +248,7 @@ func parseCli(args []string) (options, []string, error) {
 		pflag.PrintDefaults()
 	}
 
+	pflag.BoolVar(&opts.NoConfigFile, "no-config-file", false, "skip reading config file\n")
 	pflag.StringVarP(&opts.BinDirectory, "bin-directory", "B", "", "PostgreSQL binaries directory. Empty to search $PATH")
 	pflag.StringVarP(&opts.Directory, "backup-directory", "b", "/var/backups/postgresql", "store dump files there")
 	pflag.StringVarP(&opts.CfgFile, "config", "c", defaultCfgFile, "alternate config file")

config_test.go

@@ -28,15 +28,16 @@ package main
 import (
 	"errors"
 	"fmt"
-	"github.com/google/go-cmp/cmp"
-	"github.com/google/go-cmp/cmp/cmpopts"
-	"github.com/spf13/pflag"
-	"gopkg.in/ini.v1"
 	"io/ioutil"
 	"os"
 	"runtime"
 	"testing"
 	"time"
+
+	"github.com/google/go-cmp/cmp"
+	"github.com/google/go-cmp/cmp/cmpopts"
+	"github.com/spf13/pflag"
+	"gopkg.in/ini.v1"
 )
 
 func TestValidateDumpFormat(t *testing.T) {

main.go

@@ -148,16 +148,23 @@ func run() (retVal error) {
 	// Enable verbose mode or quiet mode as soon as possible
 	l.SetVerbosity(cliOpts.Verbose, cliOpts.Quiet)
 
-	// Load configuration file and allow the default configuration
-	// file to be absent
-	configOpts, err := loadConfigurationFile(cliOpts.CfgFile)
-	if err != nil {
-		return err
+	var cliOptions options
+
+	if cliOpts.NoConfigFile {
+		l.Infoln("*** Skipping reading config file")
+		cliOptions = defaultOptions()
+	} else {
+		// Load configuration file and allow the default configuration
+		// file to be absent
+		cliOptions, err = loadConfigurationFile(cliOpts.CfgFile)
+		if err != nil {
+			return err
+		}
 	}
 
 	// override options from the configuration file with ones from
 	// the command line
-	opts := mergeCliAndConfigOptions(cliOpts, configOpts, cliOptList)
+	opts := mergeCliAndConfigOptions(cliOpts, cliOptions, cliOptList)
 
 	// Ensure a non-empty passphrase is set when asking for encryption
 	if (opts.Encrypt || opts.Decrypt) && len(opts.CipherPassphrase) == 0 {