Shortcircuit commands with version or help flags (#7683)

* Shortcircuit search with help and version flag

Signed-off-by: Derek Nola <derek.nola@suse.com>

* Keep functions seperate

Signed-off-by: Derek Nola <derek.nola@suse.com>

---------

Signed-off-by: Derek Nola <derek.nola@suse.com>

pkg/configfilearg/defaultparser.go

@@ -9,7 +9,7 @@ import (
 
 var DefaultParser = &Parser{
 	After:         []string{"server", "agent", "etcd-snapshot:1"},
-	FlagNames:     []string{"--config", "-c"},
+	ConfigFlags:   []string{"--config", "-c"},
 	EnvName:       version.ProgramUpper + "_CONFIG_FILE",
 	DefaultConfig: "/etc/rancher/" + version.Program + "/config.yaml",
 	ValidFlags:    map[string][]cli.Flag{"server": cmds.ServerFlags, "etcd-snapshot": cmds.EtcdSnapshotFlags},
@@ -25,8 +25,7 @@ func MustParse(args []string) []string {
 
 func MustFindString(args []string, target string) string {
 	parser := &Parser{
-		After:         []string{},
-		FlagNames:     []string{},
+		OverrideFlags: []string{"--help", "-h", "--version", "-v"},
 		EnvName:       version.ProgramUpper + "_CONFIG_FILE",
 		DefaultConfig: "/etc/rancher/" + version.Program + "/config.yaml",
 	}

pkg/configfilearg/parser.go

@@ -20,9 +20,12 @@ import (
 
 type Parser struct {
 	After         []string
-	FlagNames     []string
+	ConfigFlags   []string
+	OverrideFlags []string
 	EnvName       string
 	DefaultConfig string
+	// ValidFlags are maps of flags that are valid for that particular conmmand. This enables us to ignore flags in
+	// the config file that do no apply to the current command.
 	ValidFlags map[string][]cli.Flag
 }
 
@@ -97,6 +100,12 @@ func (p *Parser) stripInvalidFlags(command string, args []string) ([]string, err
 }
 
 func (p *Parser) FindString(args []string, target string) (string, error) {
+
+	// Check for --help or --version flags, which override any other flags
+	if val, found := p.findOverrideFlag(args); found {
+		return val, nil
+	}
+
 	configFile, isSet := p.findConfigFileFlag(args)
 	var lastVal string
 	if configFile != "" {
@@ -140,13 +149,25 @@ func (p *Parser) FindString(args []string, target string) (string, error) {
 	return lastVal, nil
 }
 
+func (p *Parser) findOverrideFlag(args []string) (string, bool) {
+	for _, arg := range args {
+		for _, flagName := range p.OverrideFlags {
+			if flagName == arg {
+				return arg, true
+			}
+		}
+	}
+
+	return "", false
+}
+
 func (p *Parser) findConfigFileFlag(args []string) (string, bool) {
 	if envVal := os.Getenv(p.EnvName); p.EnvName != "" && envVal != "" {
 		return envVal, true
 	}
 
 	for i, arg := range args {
-		for _, flagName := range p.FlagNames {
+		for _, flagName := range p.ConfigFlags {
 			if flagName == arg {
 				if len(args) > i+1 {
 					return args[i+1], true

pkg/configfilearg/parser_test.go

@@ -199,7 +199,7 @@ func Test_UnitParser_findConfigFileFlag(t *testing.T) {
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
 			p := Parser{
-				FlagNames:     []string{"--config", "-c"},
+				ConfigFlags:   []string{"--config", "-c"},
 				EnvName:       "_TEST_FLAG_ENV",
 				DefaultConfig: tt.fields.DefaultConfig,
 			}
@@ -328,7 +328,7 @@ func Test_UnitParser_Parse(t *testing.T) {
 		t.Run(tt.name, func(t *testing.T) {
 			p := &Parser{
 				After:         tt.fields.After,
-				FlagNames:     tt.fields.FlagNames,
+				ConfigFlags:   tt.fields.FlagNames,
 				EnvName:       tt.fields.EnvName,
 				DefaultConfig: tt.fields.DefaultConfig,
 			}
@@ -447,7 +447,7 @@ func Test_UnitParser_FindString(t *testing.T) {
 		t.Run(tt.name, func(t *testing.T) {
 			p := &Parser{
 				After:         tt.fields.After,
-				FlagNames:     tt.fields.FlagNames,
+				ConfigFlags:   tt.fields.FlagNames,
 				EnvName:       tt.fields.EnvName,
 				DefaultConfig: tt.fields.DefaultConfig,
 			}