From eff9c0c8c6d32c2060841a9b9b98d9d4b38540b2 Mon Sep 17 00:00:00 2001
From: Julien Dessaux
Date: Wed, 17 Nov 2021 10:30:17 +0100
Subject: Refactored to replace github pkg errors dependencies with fmt.Errorf

---
 go.mod                |  1 -
 go.sum                |  2 --
 pkg/client/input.go   |  5 ++---
 pkg/config/action.go  | 23 +++++++++++------------
 pkg/config/app.go     | 14 +++++++-------
 pkg/config/command.go | 13 ++++++-------
 pkg/config/config.go  | 12 ++++++------
 pkg/config/game.go    | 18 +++++++++---------
 pkg/config/menu.go    | 27 +++++++++++++--------------
 9 files changed, 54 insertions(+), 61 deletions(-)

diff --git a/go.mod b/go.mod
index 1bc7123..1b68bd1 100644
--- a/go.mod
+++ b/go.mod
@@ -3,7 +3,6 @@ module shell-game-launcher
 go 1.17
 
 require (
-	github.com/pkg/errors v0.9.1
 	golang.org/x/sys v0.0.0-20211116061358-0a5406a5449c
 	gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b
 )
diff --git a/go.sum b/go.sum
index 846bb3d..383a646 100644
--- a/go.sum
+++ b/go.sum
@@ -1,5 +1,3 @@
-github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
-github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 golang.org/x/sys v0.0.0-20211116061358-0a5406a5449c h1:DHcbWVXeY+0Y8HHKR+rbLwnoh2F4tNCY7rTiHJ30RmA=
 golang.org/x/sys v0.0.0-20211116061358-0a5406a5449c/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
diff --git a/pkg/client/input.go b/pkg/client/input.go
index 8c814a6..bcdab13 100644
--- a/pkg/client/input.go
+++ b/pkg/client/input.go
@@ -2,9 +2,8 @@ package client
 
 import (
 	"bufio"
+	"fmt"
 	"os"
-
-	"github.com/pkg/errors"
 )
 
 // getValidInput returns the selected menu command as a string or an error
@@ -15,7 +14,7 @@ func (s *State) getValidInput() (string, error) {
 	for {
 		input, err := reader.ReadByte()
 		if err != nil {
-			return "", errors.Wrapf(err, "Could not read byte from stdin")
+			return "", fmt.Errorf("Could not read byte from stdin : %w", err)
 		}
 		for _, menuEntry := range menu.MenuEntries {
 			if []byte(menuEntry.Key)[0] == input {
diff --git a/pkg/config/action.go b/pkg/config/action.go
index c63308e..4693040 100644
--- a/pkg/config/action.go
+++ b/pkg/config/action.go
@@ -1,9 +1,8 @@
 package config
 
 import (
+	"fmt"
 	"strings"
-
-	"github.com/pkg/errors"
 )
 
 func validateAction(action string) error {
@@ -11,44 +10,44 @@ func validateAction(action string) error {
 	switch tokens[0] {
 	case "chmail":
 		if len(tokens) != 1 {
-			return errors.New("chmail action takes no arguments")
+			return fmt.Errorf("chmail action takes no arguments")
 		}
 	case "login":
 		if len(tokens) != 1 {
-			return errors.New("login action takes no arguments")
+			return fmt.Errorf("login action takes no arguments")
 		}
 	case "menu":
 		if len(tokens) != 2 {
-			return errors.New("menu action takes exactly one argument")
+			return fmt.Errorf("menu action takes exactly one argument")
 		}
 		// menu existence is tested in global config
 	case "passwd":
 		if len(tokens) != 1 {
-			return errors.New("passwd action takes no arguments")
+			return fmt.Errorf("passwd action takes no arguments")
 		}
 	case "play":
 		if len(tokens) != 2 {
-			return errors.New("play action takes exactly one argument")
+			return fmt.Errorf("play action takes exactly one argument")
 		}
 		// game existence is tested in global config
 	case "register":
 		if len(tokens) != 1 {
-			return errors.New("register action takes no arguments")
+			return fmt.Errorf("register action takes no arguments")
 		}
 	case "replay":
 		if len(tokens) != 1 {
-			return errors.New("replay action takes no arguments")
+			return fmt.Errorf("replay action takes no arguments")
 		}
 	case "watch":
 		if len(tokens) != 1 {
-			return errors.New("watch action takes no arguments")
+			return fmt.Errorf("watch action takes no arguments")
 		}
 	case "quit":
 		if len(tokens) != 1 {
-			return errors.New("quit action takes no arguments")
+			return fmt.Errorf("quit action takes no arguments")
 		}
 	default:
-		return errors.New("Invalid action : " + tokens[0])
+		return fmt.Errorf("Invalid action : " + tokens[0])
 	}
 	return nil
 }
diff --git a/pkg/config/app.go b/pkg/config/app.go
index 2787517..d7024c7 100644
--- a/pkg/config/app.go
+++ b/pkg/config/app.go
@@ -1,9 +1,9 @@
 package config
 
 import (
+	"fmt"
 	"os"
 
-	"github.com/pkg/errors"
 	"golang.org/x/sys/unix"
 )
 
@@ -27,28 +27,28 @@ type App struct {
 func (a *App) validate() error {
 	// WorkingDirectory
 	if err := os.MkdirAll(a.WorkingDirectory, 0700); err != nil {
-		return errors.Wrapf(err, "Invalid WorkingDirectory : %s", a.WorkingDirectory)
+		return fmt.Errorf("Invalid WorkingDirectory %s : %w", a.WorkingDirectory, err)
 	}
 	if err := unix.Access(a.WorkingDirectory, unix.W_OK|unix.R_OK|unix.X_OK); err != nil {
-		return errors.Wrapf(err, "invalid WorkingDirectory : %s", a.WorkingDirectory)
+		return fmt.Errorf("invalid WorkingDirectory %s : %w", a.WorkingDirectory, err)
 	}
 	// MaxUsers
 	if a.MaxUsers <= 0 {
-		return errors.New("MaxUsers must be a positive integer")
+		return fmt.Errorf("MaxUsers must be a positive integer")
 	}
 	// AllowRegistration is just a bool, nothing to validate
 	// MaxNickLen
 	if a.MaxNickLen <= 0 {
-		return errors.New("MaxNickLen must be a positive integer")
+		return fmt.Errorf("MaxNickLen must be a positive integer")
 	}
 	// MenuMaxIdleTime
 	if a.MenuMaxIdleTime <= 0 {
-		return errors.New("MenuMaxIdleTime must be a positive integer")
+		return fmt.Errorf("MenuMaxIdleTime must be a positive integer")
 	}
 	// PostLoginCommands
 	for i := 0; i < len(a.PostLoginCommands); i++ {
 		if err := validateCommand(a.PostLoginCommands[i]); err != nil {
-			return errors.Wrap(err, "Failed to validate PostLoginCommands")
+			return fmt.Errorf("Failed to validate PostLoginCommands : %w", err)
 		}
 	}
 	return nil
diff --git a/pkg/config/command.go b/pkg/config/command.go
index 34142cd..ad19142 100644
--- a/pkg/config/command.go
+++ b/pkg/config/command.go
@@ -1,9 +1,8 @@
 package config
 
 import (
+	"fmt"
 	"strings"
-
-	"github.com/pkg/errors"
 )
 
 func validateCommand(cmd string) error {
@@ -11,22 +10,22 @@ func validateCommand(cmd string) error {
 	switch tokens[0] {
 	case "cp":
 		if len(tokens) != 3 {
-			return errors.New("cp command takes exactly two arguments")
+			return fmt.Errorf("cp command takes exactly two arguments")
 		}
 	case "exec":
 		if len(tokens) <= 1 {
-			return errors.New("exec command needs arguments")
+			return fmt.Errorf("exec command needs arguments")
 		}
 	case "mkdir":
 		if len(tokens) != 2 {
-			return errors.New("mkdir command takes exactly one argument")
+			return fmt.Errorf("mkdir command takes exactly one argument")
 		}
 	case "wait":
 		if len(tokens) != 1 {
-			return errors.New("wait command takes no arguments")
+			return fmt.Errorf("wait command takes no arguments")
 		}
 	default:
-		return errors.New("Invalid command : " + tokens[0])
+		return fmt.Errorf("Invalid command : " + tokens[0])
 	}
 	return nil
 }
diff --git a/pkg/config/config.go b/pkg/config/config.go
index b68a26a..b363a0c 100644
--- a/pkg/config/config.go
+++ b/pkg/config/config.go
@@ -1,9 +1,9 @@
 package config
 
 import (
+	"fmt"
 	"os"
 
-	"github.com/pkg/errors"
 	"gopkg.in/yaml.v3"
 )
 
@@ -23,7 +23,7 @@ func (c *Config) validate() error {
 	}
 	// Menus
 	if len(c.Menus) < 2 {
-		return errors.New("A valid configuration needs at least two menu entries named anonymous and logged_in")
+		return fmt.Errorf("A valid configuration needs at least two menu entries named anonymous and logged_in")
 	}
 	for k, v := range c.Menus {
 		if err := v.validate(k); err != nil {
@@ -44,20 +44,20 @@ func LoadFile(path string) (*Config, error) {
 	var c *Config
 	f, errOpen := os.Open(path)
 	if errOpen != nil {
-		return nil, errors.Wrapf(errOpen, "Failed to open configuration file %s", path)
+		return nil, fmt.Errorf("Failed to open configuration file %s : %w", path, errOpen)
 	}
 	defer f.Close()
 	decoder := yaml.NewDecoder(f)
 	if err := decoder.Decode(&c); err != nil {
-		return nil, errors.Wrap(err, "Failed to decode configuration file")
+		return nil, fmt.Errorf("Failed to decode configuration file : %w", err)
 	}
 	if err := c.validate(); err != nil {
-		return nil, errors.Wrap(err, "Failed to validate configuration")
+		return nil, fmt.Errorf("Failed to validate configuration : %w", err)
 	}
 	// If all looks good we validate menu consistency
 	for _, v := range c.Menus {
 		if err := v.validateConsistency(c); err != nil {
-			return nil, errors.Wrap(err, "Failed menu consistency checks")
+			return nil, fmt.Errorf("Failed menu consistency checks : %w", err)
 		}
 	}
 	return c, nil
diff --git a/pkg/config/game.go b/pkg/config/game.go
index b5f4d39..5326073 100644
--- a/pkg/config/game.go
+++ b/pkg/config/game.go
@@ -1,9 +1,9 @@
 package config
 
 import (
+	"fmt"
 	"regexp"
 
-	"github.com/pkg/errors"
 	"golang.org/x/sys/unix"
 )
 
@@ -26,23 +26,23 @@ type Game struct {
 func (g *Game) validate(name string) error {
 	// Game name
 	if ok := reValidGameName.MatchString(name); !ok {
-		return errors.New("Invalid Game name, must match regex `^[\\w\\._]+$` : " + name)
+		return fmt.Errorf("Invalid Game name, must match regex `^[\\w\\._]+$` : " + name)
 	}
 	// ChrootPath  TODO
 	if err := unix.Access(g.ChrootPath, unix.R_OK|unix.X_OK); err != nil {
-		return errors.Wrapf(err, "Invalid ChrootPath : %s", g.ChrootPath)
+		return fmt.Errorf("Invalid ChrootPath %s : %w", g.ChrootPath, err)
 	}
 	// FileMode
 	if ok := reValidFileMode.MatchString(g.FileMode); !ok {
-		return errors.New("Invalid File Mode, must match regex `^0[\\d]{3}$` : " + name)
+		return fmt.Errorf("Invalid File Mode, must match regex `^0[\\d]{3}$` : " + name)
 	}
 	// Commands
 	if len(g.Commands) == 0 {
-		return errors.New("Invalid game " + name + " has no commands")
+		return fmt.Errorf("Invalid game " + name + " has no commands")
 	}
 	for i := 0; i < len(g.Commands); i++ {
 		if err := validateCommand(g.Commands[i]); err != nil {
-			return errors.Wrapf(err, "Failed to validate Commands for game %s", name)
+			return fmt.Errorf("Failed to validate Commands for game %s : %w", name, err)
 		}
 	}
 	// Env
@@ -50,12 +50,12 @@ func (g *Game) validate(name string) error {
 		for _, c := range k {
 			switch c {
 			case '=':
-				return errors.New("Environment variable key must not contain equal sign")
+				return fmt.Errorf("Environment variable key must not contain equal sign")
 			case '\000':
-				return errors.New("Environment variable key must not contain null character")
+				return fmt.Errorf("Environment variable key must not contain null character")
 			}
 			if reSpace.MatchString(string(c)) {
-				return errors.New("Environment variable key must not contain spaces")
+				return fmt.Errorf("Environment variable key must not contain spaces")
 			}
 		}
 	}
diff --git a/pkg/config/menu.go b/pkg/config/menu.go
index 7321c7b..a2c5e1e 100644
--- a/pkg/config/menu.go
+++ b/pkg/config/menu.go
@@ -1,10 +1,9 @@
 package config
 
 import (
+	"fmt"
 	"regexp"
 	"strings"
-
-	"github.com/pkg/errors"
 )
 
 var reValidMenuName = regexp.MustCompile(`^[\w\._]+$`)
@@ -31,18 +30,18 @@ type MenuEntry struct {
 func (m *Menu) validate(name string) error {
 	// validate name
 	if ok := reValidMenuName.MatchString(name); !ok {
-		return errors.New("Invalid menu name, must be an alphanumeric word and match regex `^[\\w\\._]+$` : " + name)
+		return fmt.Errorf("Invalid menu name, must be an alphanumeric word and match regex `^[\\w\\._]+$` : " + name)
 	}
 	// Banner is just any string, nothing to validate
 	// MenuEntries
 	if len(m.MenuEntries) == 0 {
-		return errors.New("A Menu needs MenuEntries to be valid")
+		return fmt.Errorf("A Menu needs MenuEntries to be valid")
 	}
 	// Duplicate detection is natively handled by the yaml parser
 	for i := 0; i < len(m.MenuEntries); i++ {
 		m.MenuEntries[i].validate()
 		if m.MenuEntries[i].Action == "menu "+name {
-			return errors.New("A menu shall not loop on itself")
+			return fmt.Errorf("A menu shall not loop on itself")
 		}
 	}
 	// Loop test
@@ -52,10 +51,10 @@ func (m *Menu) validate(name string) error {
 func (m *Menu) validateConsistency(c *Config) error {
 	// Necessary menus
 	if _, ok := c.Menus["anonymous"]; !ok {
-		return errors.New("No anonymous menu declared")
+		return fmt.Errorf("No anonymous menu declared")
 	}
 	if _, ok := c.Menus["logged_in"]; !ok {
-		return errors.New("No logged_in menu declared")
+		return fmt.Errorf("No logged_in menu declared")
 	}
 	// Validate actions
 	menus := map[string]bool{
@@ -71,13 +70,13 @@ func (m *Menu) validateConsistency(c *Config) error {
 				if _, ok := c.Menus[tokens[1]]; ok {
 					menus[tokens[1]] = true
 				} else {
-					return errors.New("menu action " + tokens[1] + " in menu " + k + " does not exist")
+					return fmt.Errorf("menu action " + tokens[1] + " in menu " + k + " does not exist")
 				}
 			case "play":
 				if _, ok := c.Games[tokens[1]]; ok {
 					playable[tokens[1]] = true
 				} else {
-					return errors.New("play action " + tokens[1] + " in menu " + k + " does not exist")
+					return fmt.Errorf("play action " + tokens[1] + " in menu " + k + " does not exist")
 				}
 			}
 		}
@@ -85,12 +84,12 @@ func (m *Menu) validateConsistency(c *Config) error {
 	// Check for unreachables
 	for k, _ := range c.Menus {
 		if _, ok := menus[k]; !ok {
-			return errors.New("unreachable menu : " + k)
+			return fmt.Errorf("unreachable menu : " + k)
 		}
 	}
 	for k, _ := range c.Games {
 		if _, ok := playable[k]; !ok {
-			return errors.New("unplayable game : " + k)
+			return fmt.Errorf("unplayable game : " + k)
 		}
 	}
 	return nil
@@ -99,15 +98,15 @@ func (m *Menu) validateConsistency(c *Config) error {
 func (m *MenuEntry) validate() error {
 	// Key
 	if ok := reValidKey.MatchString(m.Key); !ok {
-		return errors.New("Invalid Key, must be exactly one alphanumeric character and match regex `^\\w$` : " + m.Key)
+		return fmt.Errorf("Invalid Key, must be exactly one alphanumeric character and match regex `^\\w$` : " + m.Key)
 	}
 	// Label
 	if len(m.Label) <= 0 {
-		return errors.New("Invalid Label, cannot be empty")
+		return fmt.Errorf("Invalid Label, cannot be empty")
 	}
 	// Action
 	if err := validateAction(m.Action); err != nil {
-		return errors.Wrap(err, "Invalid Action in MenuEntry")
+		return fmt.Errorf("Invalid Action in MenuEntry : %w", err)
 	}
 	return nil
 }
-- 
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