restructure packages and start picking apart functions

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
+}