fix: windows installation for restic 0.17.1 (#474)

Note: this fix relocates the restic binary on windows to C:\Program Files\backrest  OR to the directory where backrest is installed (path relative).

internal/env/environment.go

@@ -32,7 +32,7 @@ func ConfigFilePath() string {
 	if val := os.Getenv(EnvVarConfigPath); val != "" {
 		return val
 	}
-	return path.Join(getConfigDir(), "backrest/config.json")
+	return filepath.Join(getConfigDir(), "backrest", "config.json")
 }
 
 // DataDir
@@ -50,7 +50,7 @@ func DataDir() string {
 	}
 
 	if runtime.GOOS == "windows" {
-		return path.Join(getConfigDir(), "backrest/data")
+		return filepath.Join(getConfigDir(), "backrest", "data")
 	}
 	return path.Join(getHomeDir(), ".local/share/backrest")
 }
@@ -99,7 +99,7 @@ func getConfigDir() string {
 	if val := os.Getenv("XDG_CONFIG_HOME"); val != "" {
 		return val
 	}
-	return path.Join(getHomeDir(), ".config")
+	return filepath.Join(getHomeDir(), ".config")
 }
 
 func formatBindAddress(addr string) string {

internal/resticinstaller/resticinstaller.go

@@ -14,6 +14,7 @@ import (
 	"os"
 	"os/exec"
 	"path"
+	"path/filepath"
 	"runtime"
 	"strings"
 	"sync"
@@ -245,8 +246,8 @@ func FindOrInstallResticBinary() (string, error) {
 	// Check for restic installation in data directory.
 	resticInstallPath := path.Join(env.DataDir(), resticBinName)
 	if runtime.GOOS == "windows" {
-		programFiles := os.Getenv("programfiles")
-		resticInstallPath = path.Join(programFiles, "backrest", resticBinName)
+		// on windows use a path relative to the executable.
+		resticInstallPath, _ = filepath.Abs(path.Join(path.Dir(os.Args[0]), resticBinName))
 	}
 
 	// Install restic if not found.

pkg/restic/restic_test.go

@@ -168,12 +168,8 @@ func TestResticPartialBackup(t *testing.T) {
 		t.Fatalf("wanted summary, got: nil")
 	}
 
-	if summary.TotalFilesProcessed != 0 {
-		t.Errorf("wanted 0 files, got: %d", summary.TotalFilesProcessed)
-	}
-
 	if !slices.ContainsFunc(entries, func(e BackupProgressEntry) bool {
-		return e.MessageType == "error" && e.Item == unreadablePath
+		return e.MessageType == "error" && strings.Contains(e.Item, unreadablePath)
 	}) {
 		t.Errorf("wanted entries to contain an error event for the unreadable file (%s), but did not find it", unreadablePath)
 		t.Logf("entries:\n")