Lint fixes in gitlabshell packages

cmd/gitlab-shell-authorized-principals-check/command/command.go

+// Package command handles command creation and initialization in GitLab Shell.
 package command
 
 import (
@@ -9,6 +10,7 @@ import (
 	"gitlab.com/gitlab-org/gitlab-shell/v14/internal/config"
 )
 
+// New creates a new command based on provided arguments, config, and I/O.
 func New(arguments []string, config *config.Config, readWriter *readwriter.ReadWriter) (command.Command, error) {
 	args, err := Parse(arguments)
 	if err != nil {
@@ -22,6 +24,7 @@ func New(arguments []string, config *config.Config, readWriter *readwriter.ReadW
 	return nil, disallowedcommand.Error
 }
 
+// Parse parses command-line arguments into a CommandArgs structure.
 func Parse(arguments []string) (*commandargs.AuthorizedPrincipals, error) {
 	args := &commandargs.AuthorizedPrincipals{Arguments: arguments}
 

cmd/gitlab-shell-authorized-principals-check/main.go

+// Package main is the entry point for the GitLab Shell authorized principals check command.
 package main
 
 import (
@@ -21,6 +22,10 @@ var (
 )
 
 func main() {
+	os.Exit(run())
+}
+
+func run() int {
 	command.CheckForVersionFlag(os.Args, Version, BuildTime)
 
 	readWriter := &readwriter.ReadWriter{
@@ -31,32 +36,33 @@ func main() {
 
 	executable, err := executable.New(executable.AuthorizedPrincipalsCheck)
 	if err != nil {
-		fmt.Fprintln(readWriter.ErrOut, "Failed to determine executable, exiting")
-		os.Exit(1)
+		_, _ = fmt.Fprintln(readWriter.ErrOut, "Failed to determine executable, exiting")
+		return 1
 	}
 
 	config, err := config.NewFromDirExternal(executable.RootDir)
 	if err != nil {
-		fmt.Fprintln(readWriter.ErrOut, "Failed to read config, exiting")
-		os.Exit(1)
+		_, _ = fmt.Fprintln(readWriter.ErrOut, "Failed to read config, exiting")
+		return 1
 	}
 
 	logCloser := logger.Configure(config)
-	defer logCloser.Close()
+	defer logCloser.Close() //nolint:errcheck
 
 	cmd, err := cmd.New(os.Args[1:], config, readWriter)
 	if err != nil {
 		// For now this could happen if `SSH_CONNECTION` is not set on
 		// the environment
-		fmt.Fprintf(readWriter.ErrOut, "%v\n", err)
-		os.Exit(1)
+		_, _ = fmt.Fprintf(readWriter.ErrOut, "%v\n", err)
+		return 1
 	}
 
 	ctx, finished := command.Setup(executable.Name, config)
 	defer finished()
 
-	if ctx, err = cmd.Execute(ctx); err != nil {
+	if _, err = cmd.Execute(ctx); err != nil {
 		console.DisplayWarningMessage(err.Error(), readWriter.ErrOut)
-		os.Exit(1)
+		return 1
 	}
+	return 0
 }

cmd/gitlab-shell-check/main.go

+// Package main is the entry point for the GitLab Shell health check command.
 package main
 
 import (
@@ -20,6 +21,10 @@ var (
 )
 
 func main() {
+	os.Exit(run())
+}
+
+func run() int {
 	command.CheckForVersionFlag(os.Args, Version, BuildTime)
 
 	readWriter := &readwriter.ReadWriter{
@@ -28,32 +33,38 @@ func main() {
 		ErrOut: os.Stderr,
 	}
 
+	exitOnError := func(err error, message string) int {
+		if err != nil {
+			_, _ = fmt.Fprintf(readWriter.ErrOut, "%s: %v\n", message, err)
+			return 1
+		}
+		return 0
+	}
+
 	executable, err := executable.New(executable.Healthcheck)
-	if err != nil {
-		fmt.Fprintln(readWriter.ErrOut, "Failed to determine executable, exiting")
-		os.Exit(1)
+	if code := exitOnError(err, "Failed to determine executable, exiting"); code != 0 {
+		return code
 	}
 
 	config, err := config.NewFromDirExternal(executable.RootDir)
-	if err != nil {
-		fmt.Fprintln(readWriter.ErrOut, "Failed to read config, exiting")
-		os.Exit(1)
+	if code := exitOnError(err, "Failed to read config, exiting"); code != 0 {
+		return code
 	}
 
 	logCloser := logger.Configure(config)
-	defer logCloser.Close()
+	defer logCloser.Close() //nolint:errcheck
 
 	cmd, err := checkCmd.New(config, readWriter)
-	if err != nil {
-		fmt.Fprintf(readWriter.ErrOut, "%v\n", err)
-		os.Exit(1)
+	if code := exitOnError(err, "Failed to create command"); code != 0 {
+		return code
 	}
 
 	ctx, finished := command.Setup(executable.Name, config)
 	defer finished()
 
-	if ctx, err = cmd.Execute(ctx); err != nil {
-		fmt.Fprintf(readWriter.ErrOut, "%v\n", err)
-		os.Exit(1)
+	if _, err = cmd.Execute(ctx); err != nil {
+		_, _ = fmt.Fprintf(readWriter.ErrOut, "%v\n", err)
+		return 1
 	}
+	return 0
 }

support/lint_last_known_acceptable.txt

@@ -42,24 +42,6 @@ client/transport.go:58:1: exported: exported function DefaultTransport should ha
 client/transport.go:62:1: exported: exported function NewTransport should have comment or be unexported (revive)
 cmd/gitlab-shell-authorized-keys-check/main.go:40:14: Error return value of `fmt.Fprintf` is not checked (errcheck)
 cmd/gitlab-shell-authorized-keys-check/main.go:43:13: unnecessary conversion (unconvert)
-cmd/gitlab-shell-authorized-principals-check/command/command.go:1:1: package-comments: should have a package comment (revive)
-cmd/gitlab-shell-authorized-principals-check/command/command.go:12:1: exported: exported function New should have comment or be unexported (revive)
-cmd/gitlab-shell-authorized-principals-check/command/command.go:25:1: exported: exported function Parse should have comment or be unexported (revive)
-cmd/gitlab-shell-authorized-principals-check/main.go:1:1: package-comments: should have a package comment (revive)
-cmd/gitlab-shell-authorized-principals-check/main.go:34:15: Error return value of `fmt.Fprintln` is not checked (errcheck)
-cmd/gitlab-shell-authorized-principals-check/main.go:40:15: Error return value of `fmt.Fprintln` is not checked (errcheck)
-cmd/gitlab-shell-authorized-principals-check/main.go:45:23: Error return value of `logCloser.Close` is not checked (errcheck)
-cmd/gitlab-shell-authorized-principals-check/main.go:51:14: Error return value of `fmt.Fprintf` is not checked (errcheck)
-cmd/gitlab-shell-authorized-principals-check/main.go:52:3: exitAfterDefer: os.Exit will exit, and `defer logCloser.Close()` will not run (gocritic)
-cmd/gitlab-shell-authorized-principals-check/main.go:58:5: ineffectual assignment to ctx (ineffassign)
-cmd/gitlab-shell-check/main.go:1:1: package-comments: should have a package comment (revive)
-cmd/gitlab-shell-check/main.go:33:15: Error return value of `fmt.Fprintln` is not checked (errcheck)
-cmd/gitlab-shell-check/main.go:39:15: Error return value of `fmt.Fprintln` is not checked (errcheck)
-cmd/gitlab-shell-check/main.go:44:23: Error return value of `logCloser.Close` is not checked (errcheck)
-cmd/gitlab-shell-check/main.go:48:14: Error return value of `fmt.Fprintf` is not checked (errcheck)
-cmd/gitlab-shell-check/main.go:49:3: exitAfterDefer: os.Exit will exit, and `defer logCloser.Close()` will not run (gocritic)
-cmd/gitlab-shell-check/main.go:55:5: ineffectual assignment to ctx (ineffassign)
-cmd/gitlab-shell-check/main.go:56:14: Error return value of `fmt.Fprintf` is not checked (errcheck)
 cmd/gitlab-shell/command/command.go:74: cmd/gitlab-shell/command/command.go:74: Line contains TODO/BUG/FIXME/NOTE/OPTIMIZE/HACK: "FIXME: When 1.21+ only Golang is support..." (godox)
 cmd/gitlab-shell/main.go:1:1: package-comments: should have a package comment (revive)
 cmd/gitlab-shell/main.go:42:15: Error return value of `fmt.Fprintln` is not checked (errcheck)