restructure packages and start picking apart functions

cmd/cetcher/main.go

@@ -0,0 +1,283 @@
+// package cetcher is the cli app for the go-etcher project
+package cetcher
+
+import (
+	"crypto/sha256"
+	"fmt"
+	"io"
+	"log"
+	"os"
+	"strings"
+	"time"
+
+	ac "github.com/JoaoDanielRufino/go-input-autocomplete"
+	"github.com/briandowns/spinner"
+	"github.com/byReqz/go-etcher/etcher"
+	"github.com/fatih/color"
+	"github.com/schollz/progressbar/v3"
+	flag "github.com/spf13/pflag"
+)
+
+var device string
+var input string
+var force bool
+var disable_hash bool
+
+func init() {
+	flag.StringVarP(&device, "device", "d", "", "target device")
+	flag.StringVarP(&input, "input", "i", "", "input file")
+	flag.BoolVarP(&force, "force", "f", false, "override safety features")
+	flag.BoolVarP(&disable_hash, "no-hash", "n", false, "disable hash verification")
+	flag.Parse()
+}
+
+func GetPath() string {
+	path, err := ac.Read("[ " + color.YellowString("i") + " ]  Please input your image file: ")
+	if err != nil {
+		log.Fatal(err)
+	}
+	path = strings.TrimSpace(path)
+	if strings.HasPrefix(path, "~/") {
+		homedir, err := os.UserHomeDir()
+		if err != nil {
+			log.Fatal(err)
+		}
+		return homedir + path[1:]
+	}
+	if path == "" {
+		fmt.Println("[", color.RedString("!"), "]  No image given, retrying.")
+		path = GetPath()
+	}
+	return path
+}
+
+func GetDest() string {
+	PrintAvail()
+	dest, err := ac.Read("[ " + color.YellowString("i") + " ]  Please input destination: ")
+	if err != nil {
+		log.Fatal(err)
+	}
+	dest = strings.TrimSpace(dest)
+	if strings.HasPrefix(dest, "~/") {
+		homedir, err := os.UserHomeDir()
+		if err != nil {
+			log.Fatal(err)
+		}
+		return homedir + dest[1:]
+	}
+	if dest == "" {
+		fmt.Println("[", color.RedString("!"), "]  No destination given, retrying.")
+		dest = GetDest()
+	}
+	return dest
+}
+
+func WriteImage(image *os.File, target *os.File, size int64) (int64, error) {
+	bar := progressbar.NewOptions(int(size),
+		progressbar.OptionSetWriter(os.Stderr),
+		progressbar.OptionShowBytes(true),
+		progressbar.OptionSetWidth(25),
+		progressbar.OptionSetDescription("Writing image file..."),
+		progressbar.OptionSetTheme(progressbar.Theme{
+			Saucer:        "=",
+			SaucerHead:    ">",
+			SaucerPadding: " ",
+			BarStart:      "[",
+			BarEnd:        "]",
+		}))
+	writer := io.MultiWriter(target, bar)
+	written, err := io.Copy(writer, image)
+	if err != nil {
+		return 0, err
+	}
+	return written, err
+}
+
+func PrintAvail() {
+	devices, err := etcher.GetBlockdevices()
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	fmt.Println("Available devices:")
+
+	for _, dev := range devices {
+		fmt.Print("     * ", dev.Path)
+		if dev.Size > 0 {
+			fmt.Print(" [", (dev.Size / 1024 / 1024 / 1024), "GB]\n")
+		} else {
+			fmt.Println("")
+		}
+	}
+}
+
+func Main() {
+	s := spinner.New(spinner.CharSets[14], 100*time.Millisecond)
+
+	if input == "" {
+		if len(flag.Args()) == 0 {
+			input = GetPath()
+		} else if len(flag.Args()) > 0 {
+			input = flag.Args()[0]
+		}
+	}
+
+	if device == "" {
+		if len(flag.Args()) == 0 {
+			device = GetDest()
+		} else if len(flag.Args()) > 0 {
+			if input == flag.Args()[0] && len(flag.Args()) > 1 {
+				device = flag.Args()[1]
+			} else if input != flag.Args()[0] && len(flag.Args()) > 0 {
+				device = flag.Args()[0]
+			}
+		}
+	}
+
+	s.Prefix = "[ "
+	s.Suffix = " ]  Getting file details"
+	s.Start()
+	statinput, err := os.Stat(input)
+	if err != nil {
+		s.Stop()
+		fmt.Println("\r[", color.RedString("✘"), "]  Getting file details                     ")
+		log.Fatal(err)
+	}
+	statdevice, err := os.Stat(device)
+	if err != nil {
+		s.Stop()
+		fmt.Println("\r[", color.RedString("✘"), "]  Getting file details                     ")
+		log.Fatal(err)
+	}
+	image, err := os.Open(input)
+	if err != nil {
+		s.Stop()
+		fmt.Println("\r[", color.RedString("✘"), "]  Getting file details                     ")
+		log.Fatal(err)
+	}
+	var inputsize int64
+	var inputisblock bool
+	if statinput.Size() != 0 {
+		inputsize = statinput.Size()
+		inputisblock = false
+	} else {
+		inputsize, _ = image.Seek(0, io.SeekEnd)
+		inputisblock = true
+		_, _ = image.Seek(0, 0)
+	}
+	target, err := os.OpenFile(device, os.O_RDWR, 0660)
+	if err != nil {
+		s.Stop()
+		fmt.Println("\r[", color.RedString("✘"), "]  Getting file details                     ")
+		log.Fatal(err)
+	}
+	var targetsize int64
+	var targetisblock bool
+	if statdevice.Size() != 0 {
+		targetsize = statdevice.Size()
+		targetisblock = false
+	} else {
+		targetsize, err = target.Seek(0, io.SeekEnd)
+		targetisblock = true
+		_, _ = target.Seek(0, 0)
+	}
+	prehash := sha256.New()
+	if !(force || disable_hash) {
+		if err != nil {
+			s.Stop()
+			fmt.Println("\r[", color.RedString("✘"), "]  Getting file details                     ")
+			log.Fatal(err)
+		}
+
+		_, err = io.Copy(prehash, image)
+		_, _ = image.Seek(0, 0)
+	}
+	if err != nil {
+		s.Stop()
+		fmt.Println("\r[", color.RedString("✘"), "]  Getting file details                     ")
+		log.Fatal(err)
+	} else {
+		s.Stop()
+		fmt.Println("\r[", color.GreenString("✓"), "]  Getting file details                     ")
+	}
+	inputmb := fmt.Sprint("[", inputsize/1024/1024, "MB]")
+	devicemb := fmt.Sprint("[", targetsize/1024/1024, "MB]")
+	var inputblock string
+	var targetblock string
+	if inputisblock {
+		inputblock = "[Blockdevice]"
+	} else {
+		inputblock = "[File]"
+	}
+	if targetisblock {
+		targetblock = "[Blockdevice]"
+	} else {
+		targetblock = "[File]"
+	}
+	fmt.Println("[", color.BlueString("i"), "]  Input device/file: "+input, inputmb, inputblock)
+	fmt.Println("[", color.BlueString("i"), "]  Output device/file: "+device, devicemb, targetblock)
+	if !force {
+		if inputsize > targetsize {
+			fmt.Println("[", color.RedString("w"), "]", color.RedString(" Warning:"), "Input file seems to be bigger than the destination!")
+		}
+		fmt.Print(color.HiWhiteString("Do you want to continue? [y/N]: "))
+		var yesno string
+		_, _ = fmt.Scanln(&yesno)
+		yesno = strings.TrimSpace(yesno)
+		if !(yesno == "y" || yesno == "Y") {
+			log.Fatal("aborted")
+		}
+	}
+	written, err := WriteImage(image, target, inputsize)
+	_, _ = target.Seek(0, 0)
+	if err != nil {
+		fmt.Println("\r[", color.RedString("✘"), "]  Writing image,", written, "bytes written                                                    ")
+		log.Fatal(err)
+	} else {
+		fmt.Println("\r[", color.GreenString("✓"), "]  Writing image,", written, "bytes written                                                   ")
+	}
+
+	s.Prefix = "[ "
+	s.Suffix = " ]  Syncing"
+	s.Start()
+	err = image.Sync()
+	if err != nil {
+		s.Stop()
+		fmt.Println("\r[", color.RedString("✘"), "]  Syncing                    ")
+		log.Fatal(err)
+	}
+	err = target.Sync()
+	if err != nil {
+		s.Stop()
+		fmt.Println("\r[", color.RedString("✘"), "]  Syncing                    ")
+		log.Fatal(err)
+	} else {
+		s.Stop()
+		fmt.Println("\r[", color.GreenString("✓"), "]  Syncing                  ")
+	}
+	if !(force || disable_hash) {
+		s.Prefix = "[ "
+		s.Suffix = " ]  Verifying"
+		s.Start()
+		posthash := sha256.New()
+		_, err = io.CopyN(posthash, target, inputsize)
+		presum := fmt.Sprintf("%x", prehash.Sum(nil))
+		postsum := fmt.Sprintf("%x", posthash.Sum(nil))
+		if err != nil || presum != postsum {
+			s.Stop()
+			fmt.Println("\r[", color.RedString("✘"), "]  Verifying                    ")
+			log.Fatal(err)
+		} else {
+			s.Stop()
+			fmt.Println("\r[", color.GreenString("✓"), "]  Verifying                  ")
+		}
+	}
+	err = image.Close()
+	if err != nil {
+		log.Fatal(err)
+	}
+	err = target.Close()
+	if err != nil {
+		log.Fatal(err)
+	}
+}

etcher/etcher.go

@@ -0,0 +1,11 @@
+package etcher
+
+type Blockdevice struct {
+	Path string
+	Size int
+	Type string
+	//ID   string
+}
+
+// CheckHash checks if the given file has been properly applied to the given blockdevice.
+//func CheckHash(f os.File, b Blockdevice) error {}

etcher/etcher_linux.go

@@ -0,0 +1,68 @@
+package etcher
+
+import (
+	"fmt"
+	"io"
+	"os"
+	"strconv"
+	"strings"
+)
+
+// getBlockdeviceSize gets the size of a blockdevice from the kernel filesystem.
+func getBlockdeviceSize(name string) (size int, err error) {
+	sizefile, err := os.Open("/sys/block/" + name + "/size")
+	if err != nil {
+		return
+	}
+	sizeread, err := io.ReadAll(sizefile)
+	if err != nil {
+		return
+	}
+	_ = sizefile.Close()
+
+	sizestring := strings.TrimSuffix(string(sizeread), "\n")
+	size, err = strconv.Atoi(sizestring)
+	if err != nil {
+		return
+	}
+	size = size * 512 // multiply blockcount by blocksize
+
+	return size, err
+}
+
+// GetBlockdevices gets the available blockdevices for reading from/writing to.
+func GetBlockdevices() (devices []Blockdevice, err error) {
+	block, err := os.ReadDir("/sys/block")
+	if err != nil {
+		return
+	} else if len(block) == 0 {
+		return devices, fmt.Errorf("no blockdevices found")
+	}
+
+	for _, device := range block {
+		var dev Blockdevice
+
+		dev.Path = "/dev/" + device.Name()
+
+		if strings.Contains(device.Name(), "sd") {
+			dev.Type = "sata"
+		} else if strings.Contains(device.Name(), "hd") {
+			dev.Type = "ide"
+		} else if strings.Contains(device.Name(), "nvme") {
+			dev.Type = "nvme"
+		} else if strings.Contains(device.Name(), "dm") {
+			dev.Type = "dmcrypt"
+		} else if strings.Contains(device.Name(), "md") {
+			dev.Type = "raid"
+		}
+
+		dev.Size, err = getBlockdeviceSize(device.Name())
+		if err != nil {
+			return
+		}
+
+		devices = append(devices, dev)
+	}
+
+	return devices, nil
+}

main.go

@@ -1,302 +1,7 @@
 package main
 
-import (
+import "github.com/byReqz/go-etcher/cmd/cetcher"
-	"crypto/sha256"
-	"fmt"
-	ac "github.com/JoaoDanielRufino/go-input-autocomplete"
-	"github.com/briandowns/spinner"
-	"github.com/fatih/color"
-	"github.com/schollz/progressbar/v3"
-	flag "github.com/spf13/pflag"
-	"io"
-	"log"
-	"os"
-	"runtime"
-	"strconv"
-	"strings"
-	"time"
-)
-
-var device string
-var input string
-var force bool
-var disable_hash bool
-
-func init() {
-	flag.StringVarP(&device, "device", "d", "", "target device")
-	flag.StringVarP(&input, "input", "i", "", "input file")
-	flag.BoolVarP(&force, "force", "f", false, "override safety features")
-	flag.BoolVarP(&disable_hash, "no-hash", "n", false, "disable hash verification")
-	flag.Parse()
-}
-
-func GetPath() string {
-	path, err := ac.Read("[ " + color.YellowString("i") + " ]  Please input your image file: ")
-	if err != nil {
-		log.Fatal(err)
-	}
-	path = strings.TrimSpace(path)
-	if strings.HasPrefix(path, "~/") {
-		homedir, err := os.UserHomeDir()
-		if err != nil {
-			log.Fatal(err)
-		}
-		return homedir + path[1:]
-	}
-	if path == "" {
-		fmt.Println("[", color.RedString("!"), "]  No image given, retrying.")
-		path = GetPath()
-	}
-	return path
-}
-
-func GetDest() string {
-	PrintAvail()
-	dest, err := ac.Read("[ " + color.YellowString("i") + " ]  Please input destination: ")
-	if err != nil {
-		log.Fatal(err)
-	}
-	dest = strings.TrimSpace(dest)
-	if strings.HasPrefix(dest, "~/") {
-		homedir, err := os.UserHomeDir()
-		if err != nil {
-			log.Fatal(err)
-		}
-		return homedir + dest[1:]
-	}
-	if dest == "" {
-		fmt.Println("[", color.RedString("!"), "]  No destination given, retrying.")
-		dest = GetDest()
-	}
-	return dest
-}
-
-func WriteImage(image *os.File, target *os.File, size int64) (int64, error) {
-	bar := progressbar.NewOptions(int(size),
-		progressbar.OptionSetWriter(os.Stderr),
-		progressbar.OptionShowBytes(true),
-		progressbar.OptionSetWidth(25),
-		progressbar.OptionSetDescription("Writing image file..."),
-		progressbar.OptionSetTheme(progressbar.Theme{
-			Saucer:        "=",
-			SaucerHead:    ">",
-			SaucerPadding: " ",
-			BarStart:      "[",
-			BarEnd:        "]",
-		}))
-	writer := io.MultiWriter(target, bar)
-	written, err := io.Copy(writer, image)
-	if err != nil {
-		return 0, err
-	}
-	return written, err
-}
-
-func PrintAvail() {
-	if runtime.GOOS == "linux" {
-		block, _ := os.ReadDir("/sys/block")
-		if len(block) == 0 {
-			return
-		}
-		var targets []string
-		for _, device := range block {
-			if strings.HasPrefix(device.Name(), "sd") {
-				targets = append(targets, device.Name())
-			}
-			if strings.HasPrefix(device.Name(), "nvme") {
-				targets = append(targets, device.Name())
-			}
-			if strings.HasPrefix(device.Name(), "vd") {
-				targets = append(targets, device.Name())
-			}
-		}
-		fmt.Println("Available devices:")
-		for _, target := range targets {
-			sizefile, _ := os.Open("/sys/block/" + target + "/size")
-			sizeread, _ := io.ReadAll(sizefile)
-			_ = sizefile.Close()
-			sizestring := strings.ReplaceAll(string(sizeread), "\n", "")
-			size, _ := strconv.Atoi(sizestring)
-			size = size * 512
-			size = size / 1024 / 1024 / 1024
-
-			fmt.Print("     * ", "/dev/"+target)
-			if size > 0 {
-				fmt.Print(" [", size, "GB]\n")
-			} else {
-				fmt.Println("")
-			}
-		}
-	}
-}
 
 func main() {
-	s := spinner.New(spinner.CharSets[14], 100*time.Millisecond)
+	cetcher.Main()
-
-	if input == "" {
-		if len(flag.Args()) == 0 {
-			input = GetPath()
-		} else if len(flag.Args()) > 0 {
-			input = flag.Args()[0]
-		}
-	}
-
-	if device == "" {
-		if len(flag.Args()) == 0 {
-			device = GetDest()
-		} else if len(flag.Args()) > 0 {
-			if input == flag.Args()[0] && len(flag.Args()) > 1 {
-				device = flag.Args()[1]
-			} else if input != flag.Args()[0] && len(flag.Args()) > 0 {
-				device = flag.Args()[0]
-			}
-		}
-	}
-
-	s.Prefix = "[ "
-	s.Suffix = " ]  Getting file details"
-	s.Start()
-	statinput, err := os.Stat(input)
-	if err != nil {
-		s.Stop()
-		fmt.Println("\r[", color.RedString("✘"), "]  Getting file details                     ")
-		log.Fatal(err)
-	}
-	statdevice, err := os.Stat(device)
-	if err != nil {
-		s.Stop()
-		fmt.Println("\r[", color.RedString("✘"), "]  Getting file details                     ")
-		log.Fatal(err)
-	}
-	image, err := os.Open(input)
-	if err != nil {
-		s.Stop()
-		fmt.Println("\r[", color.RedString("✘"), "]  Getting file details                     ")
-		log.Fatal(err)
-	}
-	var inputsize int64
-	var inputisblock bool
-	if statinput.Size() != 0 {
-		inputsize = statinput.Size()
-		inputisblock = false
-	} else {
-		inputsize, _ = image.Seek(0, io.SeekEnd)
-		inputisblock = true
-		_, _ = image.Seek(0, 0)
-	}
-	target, err := os.OpenFile(device, os.O_RDWR, 0660)
-	if err != nil {
-		s.Stop()
-		fmt.Println("\r[", color.RedString("✘"), "]  Getting file details                     ")
-		log.Fatal(err)
-	}
-	var targetsize int64
-	var targetisblock bool
-	if statdevice.Size() != 0 {
-		targetsize = statdevice.Size()
-		targetisblock = false
-	} else {
-		targetsize, err = target.Seek(0, io.SeekEnd)
-		targetisblock = true
-		_, _ = target.Seek(0, 0)
-	}
-	prehash := sha256.New()
-	if !(force || disable_hash) {
-		if err != nil {
-			s.Stop()
-			fmt.Println("\r[", color.RedString("✘"), "]  Getting file details                     ")
-			log.Fatal(err)
-		}
-
-		_, err = io.Copy(prehash, image)
-		_, _ = image.Seek(0, 0)
-	}
-	if err != nil {
-		s.Stop()
-		fmt.Println("\r[", color.RedString("✘"), "]  Getting file details                     ")
-		log.Fatal(err)
-	} else {
-		s.Stop()
-		fmt.Println("\r[", color.GreenString("✓"), "]  Getting file details                     ")
-	}
-	inputmb := fmt.Sprint("[", inputsize/1024/1024, "MB]")
-	devicemb := fmt.Sprint("[", targetsize/1024/1024, "MB]")
-	var inputblock string
-	var targetblock string
-	if inputisblock {
-		inputblock = "[Blockdevice]"
-	} else {
-		inputblock = "[File]"
-	}
-	if targetisblock {
-		targetblock = "[Blockdevice]"
-	} else {
-		targetblock = "[File]"
-	}
-	fmt.Println("[", color.BlueString("i"), "]  Input device/file: "+input, inputmb, inputblock)
-	fmt.Println("[", color.BlueString("i"), "]  Output device/file: "+device, devicemb, targetblock)
-	if !force {
-		if inputsize > targetsize {
-			fmt.Println("[", color.RedString("w"), "]", color.RedString(" Warning:"), "Input file seems to be bigger than the destination!")
-		}
-		fmt.Print(color.HiWhiteString("Do you want to continue? [y/N]: "))
-		var yesno string
-		_, _ = fmt.Scanln(&yesno)
-		yesno = strings.TrimSpace(yesno)
-		if !(yesno == "y" || yesno == "Y") {
-			log.Fatal("aborted")
-		}
-	}
-	written, err := WriteImage(image, target, inputsize)
-	_, _ = target.Seek(0, 0)
-	if err != nil {
-		fmt.Println("\r[", color.RedString("✘"), "]  Writing image,", written, "bytes written                                                    ")
-		log.Fatal(err)
-	} else {
-		fmt.Println("\r[", color.GreenString("✓"), "]  Writing image,", written, "bytes written                                                   ")
-	}
-
-	s.Prefix = "[ "
-	s.Suffix = " ]  Syncing"
-	s.Start()
-	err = image.Sync()
-	if err != nil {
-		s.Stop()
-		fmt.Println("\r[", color.RedString("✘"), "]  Syncing                    ")
-		log.Fatal(err)
-	}
-	err = target.Sync()
-	if err != nil {
-		s.Stop()
-		fmt.Println("\r[", color.RedString("✘"), "]  Syncing                    ")
-		log.Fatal(err)
-	} else {
-		s.Stop()
-		fmt.Println("\r[", color.GreenString("✓"), "]  Syncing                  ")
-	}
-	if !(force || disable_hash) {
-		s.Prefix = "[ "
-		s.Suffix = " ]  Verifying"
-		s.Start()
-		posthash := sha256.New()
-		_, err = io.CopyN(posthash, target, inputsize)
-		presum := fmt.Sprintf("%x", prehash.Sum(nil))
-		postsum := fmt.Sprintf("%x", posthash.Sum(nil))
-		if err != nil || presum != postsum {
-			s.Stop()
-			fmt.Println("\r[", color.RedString("✘"), "]  Verifying                    ")
-			log.Fatal(err)
-		} else {
-			s.Stop()
-			fmt.Println("\r[", color.GreenString("✓"), "]  Verifying                  ")
-		}
-	}
-	err = image.Close()
-	if err != nil {
-		log.Fatal(err)
-	}
-	err = target.Close()
-	if err != nil {
-		log.Fatal(err)
-	}
 }