remove executable

backup.go

@@ -1,42 +1,29 @@
 package main
 
 import (
+	"archive/zip"
 	"bufio"
-	"errors"
 	"fmt"
-	"io/fs"
-	"log"
+	"io"
 	"os"
 	"os/exec"
+	"path/filepath"
 	"strings"
+	"time"
+
+	"github.com/pelletier/go-toml"
 )
 
-func parseEnvironment(key string) string {
-	value := os.Getenv(key)
-	if value == "" {
-		log.Panicf("%s is not set\n", key)
-	}
-	if _, err := os.Stat(value); err != nil {
-		if errors.Is(err, fs.ErrNotExist) {
-			log.Panicf("%s does not point to a valid path\n", key)
-		}
-		log.Panicf("trying to stat %s produced an unkown error\n", value)
-	}
-	return value
-}
+var backup_locations []string
 
-func parsePacmanConf() string {
+func parsePacmanConf() (string, error) {
+	var err error
 	var path string
 
 	file, err := os.Open("/etc/pacman.conf")
 	if err != nil {
-		log.Panicln(err)
+		return "", err
 	}
-	defer func() {
-		if err := file.Close(); err != nil {
-			log.Panicln(err)
-		}
-	}()
 
 	scanner := bufio.NewScanner(file)
 	for scanner.Scan() {
@@ -48,73 +35,130 @@ func parsePacmanConf() string {
 		break
 	}
 
-	if _, err := os.Stat(path); err != nil {
-		if errors.Is(err, fs.ErrNotExist) {
-			log.Panicln("DBPath in /etc/pacman.conf does not point to a valid path")
-		}
-		log.Panicf("trying to stat %s produced an unkown error\n", path)
+	err = file.Close()
+	if err != nil {
+		return "", err
 	}
 
-	return fmt.Sprintf("%s%s", path, "local")
+	return fmt.Sprint(path, "local"), nil
 }
 
-func preBackup() {
-	pacmanDb := parsePacmanConf()
-	log.Printf("pacmanDb: %s\n", pacmanDb)
-	tmpPath := "/tmp/update/pre_backup"
+func zipIt(pathToZip string, pathToFiles string) error {
+	var err error
 
-	output, err := exec.Command("pacman",  "--verbose", "--query").Output()
+	zipFile, err := os.Create(pathToZip)
 	if err != nil {
-		log.Panicln(err)
+		return err
+	}
+
+	zipWriter := zip.NewWriter(zipFile)
+
+	walker := func(path string, info os.FileInfo, err error) error {
+		if err != nil {
+			return err
+		}
+		if info.IsDir() {
+			return nil
+		}
+		file, err := os.Open(path)
+		if err != nil {
+			return err
+		}
+		defer file.Close()
+
+		f, err := zipWriter.Create(path[len(pathToFiles):])
+		if err != nil {
+			return err
+		}
+
+		_, err = io.Copy(f, file)
+		if err != nil {
+			return err
+		}
+
+		return nil
+	}
+	err = filepath.Walk(pathToFiles, walker)
+	if err != nil {
+		return err
+	}
+
+	err = zipWriter.Close()
+	if err != nil {
+		return err
+	}
+	err = zipFile.Close()
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func backup(when string) error {
+	var err error
+	tmpPath := fmt.Sprint("/tmp/update/", when, "_backup")
+	pacmanDb, err := parsePacmanConf()
+	if err != nil {
+		return err
 	}
 
 	err = os.MkdirAll(tmpPath, 0755)
-
-	err = os.WriteFile(fmt.Sprintf("%s/%s", tmpPath, "pre_pacman.txt"), output, 0644)
 	if err != nil {
-		log.Panicln(err)
+		return err
 	}
-
 	defer func() {
-		if r := recover(); r != nil {
-			err := os.RemoveAll(tmpPath)
-			if err != nil {
-				log.Fatal(err)
-			}
-
-			err = CopyDir(pacmanDb, fmt.Sprintf("%s/%s", tmpPath, pacmanDb))
-			if err != nil {
-				log.Panicln(err)
-			}
-
-			log.Println("recovered successfully")
-		}
+		os.RemoveAll("/tmp/update")
 	}()
 
-	err = CopyDir(pacmanDb, fmt.Sprintf("%s/%s", tmpPath, pacmanDb))
+	output, err := exec.Command("pacman",  "--verbose", "--query").Output()
 	if err != nil {
-		log.Panicln(err)
+		return err
 	}
-}
 
-func postBackup() {
-	/*
-	 * basic logic for post:
-	 * create new pkg list and delete all lines which are the same as pre
-	 */
-	panic("unimplemented")
+	err = os.WriteFile(fmt.Sprint(tmpPath, fmt.Sprint(when, "_pacman.txt")), output, 0644)
+	if err != nil {
+		return err
+	}
+
+	if when != "post" {
+		err = CopyDir(pacmanDb, fmt.Sprint(tmpPath, "/", pacmanDb))
+		if err != nil {
+			return err
+		}
+	}
+
+	current_time := time.Now().Format(time.RFC3339)
+	pathToZip := fmt.Sprint(tmpPath, "_", current_time, ".zip")
+	err = zipIt(pathToZip, tmpPath)
+	if err != nil {
+		return err
+	}
+
+	for _, backup_location := range backup_locations {
+		err = CopyFile(pathToZip, fmt.Sprint(backup_location, "/",  when, "_backup_", current_time, ".zip"))
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
 }
 
 func main() {
-	// backup_dir := parseEnvironment("UPDATE_BACKUP_DIR")
-	cmdlineArg := os.Args[1]
-	log.Printf("cmdlineArg: %s\n", cmdlineArg)
+	os.RemoveAll("/tmp/update")
 
-	if cmdlineArg == "pre" {
-		preBackup()
-	} else if cmdlineArg == "post" {
-		postBackup()
-	} else {
-		log.Panicf("invalid cmdline argument. supplied value was: %s\n", cmdlineArg)
+	tree, err := toml.LoadFile("/etc/update.toml")
+	if err != nil {
+		fmt.Println("backup failed for the following reason: ", err)
+		os.Exit(1)
+	}
+
+	backup_locations = tree.GetArray("backup.locations").([]string)
+
+	err = backup(os.Args[1])
+	if err != nil {
+		fmt.Println("backup failed for the following reason: ", err)
+		os.Exit(1)
 	}
 }

go.mod

@@ -1,3 +1,5 @@
-module update
+module backup
 
 go 1.23.0
+
+require github.com/pelletier/go-toml v1.9.5

go.sum

@@ -0,0 +1,2 @@
+github.com/pelletier/go-toml v1.9.5 h1:4yBQzkHv+7BHq2PQUZF3Mx0IYxG7LsP222s7Agd3ve8=
+github.com/pelletier/go-toml v1.9.5/go.mod h1:u1nR/EPcESfeI/szUZKdtJ0xRNbUoANCkoOuaOx1Y+c=

makefile

@@ -1,10 +1,28 @@
-install:
-	@echo "==> Installing update into /usr/local/bin"
-	@sudo install -Dm755 update /usr/local/bin/update
-	@[[ -f ${HOME}/.config/update.conf ]] || cp update.conf ${HOME}/.config/
+help:
+	@echo "Usage: make [OPTION]"
+	@echo "Available options are:"
+	@echo "help"
+	@echo "install"
+	@echo "uninstall"
+
+compile:
+	@echo "==> Compiling backup"
+	go build .
+
+install: compile
+	@echo "==> Copying the hooks into /etc/pacman.d/hooks"
+	[[ -d /etc/pacman.d/hooks ]] || sudo mkdir /etc/pacman.d/hooks
+	sudo cp pre_backup.hook post_backup.hook /etc/pacman.d/hooks
+	@echo "==> Copying backup into /usr/local/bin"
+	sudo install -Dm755 backup /usr/local/bin/backup
+	@echo "==> Copying the config into /etc"
+	[[ -f /etc/update.toml ]] || sudo cp update.toml /etc
 	@echo "==> Finished."
 
 uninstall:
-	@echo "==> Uninstalling update from /usr/local/bin"
-	@sudo rm /usr/local/bin/update ${HOME}/.config/update.conf
+	@echo "==> Removing the hooks from /etc/pacman.d/hooks"
+	sudo rm /etc/pacman.d/hooks/pre_backup.hook /etc/pacman.d/hooks/post_backup.hook
+	@echo "==> Removing backup into /usr/local/bin"
+	sudo rm /usr/local/bin/backup
+	@echo "==> /etc/update.toml will remain"
 	@echo "==> Finished."

post_backup.hook

@@ -2,8 +2,8 @@
 Operation = Install
 Operation = Upgrade
 Operation = Remove
-Type = Path
-Target = /usr/local/bin/backup
+Type = Package
+Target = *
 
 [Action]
 Description = Backing up the pacman db...

pre_backup.hook

@@ -2,8 +2,8 @@
 Operation = Install
 Operation = Upgrade
 Operation = Remove
-Type = Path
-Target = /usr/local/bin/backup
+Type = Package
+Target = *
 
 [Action]
 Description = Backing up the pacman db...

update.toml

@@ -0,0 +1,4 @@
+# Config for update
+
+[backup]
+locations = ['/opt'] # All locations need to be an absolute path