implement backup system

pkg/fileio/fileio.go

@@ -4,13 +4,17 @@ import (
 	"bufio"
 	"errors"
 	"fmt"
+	"io"
 	"os"
 
 	"github.com/HikariKnight/ls-iommu/pkg/errorcheck"
 )
 
-// This just implements repetetive tasks I have to do with files
+/*
+ * This just implements repetetive tasks I have to do with files
+ */
 
+// Creates a file and appends the content to the file (ending newline must be supplied with content string)
 func AppendContent(content string, fileName string) {
 	// Open the file
 	f, err := os.OpenFile(fileName, os.O_CREATE|os.O_APPEND|os.O_WRONLY, os.ModePerm)
@@ -22,6 +26,7 @@ func AppendContent(content string, fileName string) {
 	errorcheck.ErrorCheck(err, fmt.Sprintf("Error writing to %s", fileName))
 }
 
+// Reads the file and returns a stringlist with each line
 func ReadLines(fileName string) []string {
 	content, err := os.Open(fileName)
 	errorcheck.ErrorCheck(err, fmt.Sprintf("Error reading file %s", fileName))
@@ -41,6 +46,7 @@ func ReadLines(fileName string) []string {
 
 }
 
+// Reads a file and returns all the content as a string
 func ReadFile(fileName string) string {
 	// Read the whole file
 	content, err := os.ReadFile(fileName)
@@ -51,6 +57,7 @@ func ReadFile(fileName string) string {
 
 }
 
+// Checks if a file exists and returns a bool
 func FileExist(fileName string) bool {
 	var exist bool
 
@@ -66,3 +73,27 @@ func FileExist(fileName string) bool {
 	// Return if the file exists
 	return exist
 }
+
+// Copies a FILE from source to dest
+func FileCopy(sourceFile, destFile string) {
+	// Get the file info
+	filestat, err := os.Stat(sourceFile)
+	errorcheck.ErrorCheck(err, "Error getting fileinfo of: %s", sourceFile)
+
+	// If the file is a regular file
+	if filestat.Mode().IsRegular() {
+		// Open the source file for reading
+		source, err := os.Open(sourceFile)
+		errorcheck.ErrorCheck(err, "Error opening %s for copying", sourceFile)
+		defer source.Close()
+
+		// Create the destination file
+		dest, err := os.Create(destFile)
+		errorcheck.ErrorCheck(err, "Error creating %s", destFile)
+		defer dest.Close()
+
+		// Copy the contents of source to dest using io
+		_, err = io.Copy(dest, source)
+		errorcheck.ErrorCheck(err, "Failed to copy \"%s\" to \"%s\"", sourceFile, destFile)
+	}
+}