Add --include-unreachable flag and related processing

git/git.go

@@ -189,13 +189,17 @@
 // batch mode to efficiently retrieve their sizes.
 func (repo *Repository) GetUnreachableStats() (UnreachableStats, error) {
 	// Run git fsck. Using CombinedOutput captures both stdout and stderr.
-	cmd := exec.Command(repo.gitBin, "-C", repo.gitDir, "fsck", "--unreachable", "--no-reflogs", "--full")
+	gitDir, err := repo.GitDir()
+	if err != nil {
+		return UnreachableStats{Count: 0, Size: 0}, fmt.Errorf("failed to retrieve Git directory: %w", err)
+	}
+	cmd := exec.Command(repo.gitBin, "-C", gitDir, "fsck", "--unreachable", "--no-reflogs", "--full")
 	cmd.Env = os.Environ()
 	output, err := cmd.CombinedOutput()
 	if err != nil {
 		fmt.Fprintln(os.Stderr)
 		fmt.Fprintln(os.Stderr, "An error occurred trying to process unreachable objects.")
 		os.Stderr.Write(output)
 		fmt.Fprintln(os.Stderr)
 		return UnreachableStats{Count: 0, Size: 0}, err
 	}
@@ -225,7 +229,7 @@
 // the provided OIDs. It writes each OID to stdin and reads back lines in the
 // format: "<oid> <type> <size>".
 func (repo *Repository) getTotalSizeFromOids(oids []string) (int64, error) {
 	cmd := exec.Command(repo.gitBin, "-C", repo.gitDir, "cat-file", "--batch-check")
 	stdinPipe, err := cmd.StdinPipe()
 	if err != nil {
 		return 0, fmt.Errorf("failed to get stdin pipe: %w", err)
@@ -241,9 +245,9 @@
 
 	// Write all OIDs to the batch process.
 	go func() {
 		defer stdinPipe.Close()
 		for _, oid := range oids {
 			io.WriteString(stdinPipe, oid+"\n")
 		}
 	}()
 
@@ -254,7 +258,7 @@
 		parts := strings.Fields(scanner.Text())
 		if len(parts) == 3 {
 			var size int64
 			fmt.Sscanf(parts[2], "%d", &size)
 			totalSize += size
 		} else {
 			return 0, fmt.Errorf("unexpected output format: %s", scanner.Text())