Fix /slowdisk static-file offload: add reth guard and --keep-directory-symlink

- Add RETH GUARD to clone-backup.sh and clone-node.sh: when the config name
  contains 'reth', skip the whole /slowdisk static-file symlink offload and
  extract everything onto the primary disk (equivalent to --no-slowdisk).
  This matches the already-correct restore-volumes.sh behavior.
  Reason: reth refuses to start when its static_files directory is a symlink,
  failing at boot with 'failed to create dir static_files: File exists'.

- Add --keep-directory-symlink to all tar extraction options in both scripts
  for the SLOWDISK path. This allows tar to extract files THROUGH the
  pre-created directory symlinks instead of trying to mkdir over them
  (which fails with 'Cannot mkdir: File exists'). This matches the
  already-correct restore-volumes.sh behavior.

Generated by Mistral Vibe.
Co-Authored-By: Mistral Vibe <vibe@mistral.ai>

clone-backup.sh

@@ -306,7 +306,7 @@ transfer_backup() {
     local backup_basename=$(basename "$backup_file" .tar.zst)
     local metadata_file="$backup_dir/${backup_basename}.txt"
     local use_slowdisk=false
-    local tar_extract_opts="-xf - -C /"
+    local tar_extract_opts="-xf - -C / --keep-directory-symlink"
     
     if [[ -f "$metadata_file" ]] && check_slowdisk_enabled; then
         echo "Metadata file found and SLOWDISK mode enabled"
@@ -324,8 +324,9 @@ transfer_backup() {
                 if setup_slowdisk_structure "$key" "$static_size_kb" "${static_paths[@]}"; then
                     use_slowdisk=true
                     # Use --skip-old-files to avoid overwriting existing symlinks/directories
-                    # But we still want to extract files into symlinked directories
+                    # and --keep-directory-symlink so tar extracts THROUGH the pre-created dir symlinks
-                    tar_extract_opts="-xf - -C / --skip-old-files"
+                    # instead of trying to mkdir over them (which fails with 'Cannot mkdir: File exists')
+                    tar_extract_opts="-xf - -C / --skip-old-files --keep-directory-symlink"
                     echo "SLOWDISK structure ready, will extract respecting symlinks"
                 else
                     echo "Warning: Failed to setup SLOWDISK structure, falling back to normal extraction"
@@ -494,7 +495,7 @@ transfer_backup_ssh() {
     # Check for metadata file and SLOWDISK mode (same logic as transfer_backup)
     local backup_basename=$(basename "$backup_file" .tar.zst)
     local metadata_file="$backup_dir/${backup_basename}.txt"
-    local tar_extract_opts="-xf - -C /"
+    local tar_extract_opts="-xf - -C / --keep-directory-symlink"
     
     if [[ -f "$metadata_file" ]] && check_slowdisk_enabled; then
         echo "Metadata file found and SLOWDISK mode enabled"
@@ -508,7 +509,9 @@ transfer_backup_ssh() {
         if [[ ${#static_paths[@]} -gt 0 ]] && [[ -n "$static_size_kb" ]]; then
             # Setup slowdisk structure on remote
             if setup_slowdisk_structure "$key" "$static_size_kb" "${static_paths[@]}"; then
-                tar_extract_opts="-xf - -C / --skip-old-files"
+                # and --keep-directory-symlink so tar extracts THROUGH the pre-created dir symlinks
+                # instead of trying to mkdir over them (which fails with 'Cannot mkdir: File exists')
+                tar_extract_opts="-xf - -C / --skip-old-files --keep-directory-symlink"
                 echo "SLOWDISK structure ready, will extract respecting symlinks"
             else
                 echo "Warning: Failed to setup SLOWDISK structure, falling back to normal extraction"
@@ -538,6 +541,15 @@ main() {
     # Set up cleanup trap
     trap cleanup_all_ports EXIT INT TERM
     
+    # RETH GUARD: reth refuses to start when its static_files directory is a symlink.
+    # Match restore-volumes.sh: skip the whole /slowdisk static-file symlink offload
+    # for reth nodes and extract everything onto the primary disk.
+    if [[ "$1" == *reth* ]]; then
+        echo "WARNING: $1 contains 'reth' — static-file symlink offload disabled (reth broke whole-dir symlinks)"
+        echo "  All volumes will be extracted onto the primary disk (equivalent to --no-slowdisk)"
+        NO_SLOWDISK=true
+    fi
+    
     setup_ssh_multiplex
     
     # Check if backup directory exists

clone-node.sh

@@ -276,7 +276,7 @@ transfer_volume() {
     fi
     
     local folder_size=$(du -sb "$source_folder" 2>/dev/null | awk '{print $1}')
-    local tar_extract_opts="-xf - -C /"
+    local tar_extract_opts="-xf - -C / --keep-directory-symlink"
     local use_slowdisk=false
     
     # Check for SLOWDISK mode and detect static files
@@ -297,7 +297,9 @@ transfer_volume() {
                     if setup_slowdisk_structure "$key" "$static_size_kb" "${static_paths[@]}"; then
                         use_slowdisk=true
                         # Use --skip-old-files to avoid overwriting existing symlinks/directories
-                        tar_extract_opts="-xf - -C / --skip-old-files"
+                        # and --keep-directory-symlink so tar extracts THROUGH the pre-created dir symlinks
+                        # instead of trying to mkdir over them (which fails with 'Cannot mkdir: File exists')
+                        tar_extract_opts="-xf - -C / --skip-old-files --keep-directory-symlink"
                         echo "SLOWDISK structure ready, will extract respecting symlinks"
                     else
                         echo "Warning: Failed to setup SLOWDISK structure, falling back to normal extraction"
@@ -457,7 +459,7 @@ transfer_volume_ssh() {
     fi
     
     local folder_size=$(du -sb "$source_folder" 2>/dev/null | awk '{print $1}')
-    local tar_extract_opts="-xf - -C /"
+    local tar_extract_opts="-xf - -C / --keep-directory-symlink"
     
     # Check for SLOWDISK mode and detect static files (same logic as transfer_volume)
     if check_slowdisk_enabled; then
@@ -475,7 +477,9 @@ transfer_volume_ssh() {
                     echo "Setting up SLOWDISK structure on target..."
                     # Setup slowdisk structure on remote
                     if setup_slowdisk_structure "$key" "$static_size_kb" "${static_paths[@]}"; then
-                        tar_extract_opts="-xf - -C / --skip-old-files"
+                        # and --keep-directory-symlink so tar extracts THROUGH the pre-created dir symlinks
+                        # instead of trying to mkdir over them (which fails with 'Cannot mkdir: File exists')
+                        tar_extract_opts="-xf - -C / --skip-old-files --keep-directory-symlink"
                         echo "SLOWDISK structure ready, will extract respecting symlinks"
                     else
                         echo "Warning: Failed to setup SLOWDISK structure, falling back to normal extraction"
@@ -513,6 +517,15 @@ main() {
     # Set up cleanup trap
     trap cleanup_all_ports EXIT INT TERM
     
+    # RETH GUARD: reth refuses to start when its static_files directory is a symlink.
+    # Match restore-volumes.sh: skip the whole /slowdisk static-file symlink offload
+    # for reth nodes and extract everything onto the primary disk.
+    if [[ "$1" == *reth* ]]; then
+        echo "WARNING: $1 contains 'reth' — static-file symlink offload disabled (reth broke whole-dir symlinks)"
+        echo "  All volumes will be extracted onto the primary disk (equivalent to --no-slowdisk)"
+        NO_SLOWDISK=true
+    fi
+    
     setup_ssh_multiplex
     
     # the following sysctls are critical for high-latency networks