Skip checking free space on macOS during restore

Stopgap for #124.

Author: mrrfv

functions/restore_func.sh

@@ -34,11 +34,14 @@ function restore_func() {
 
   # Ensure there's enough space to extract the archive on the device
   # Note: this is a very rough estimate as we're not taking the compression ratio into account
-  archive_size_kb=$(stat --printf="%s" "$archive_path" | awk '{print $1/1024}')
-  if ! enough_free_space "." "$archive_size_kb"; then
-    cecho "Less than $archive_size_kb KB of free space available on the current directory - not enough to extract this backup."
-    cecho "Please free up some space and try again."
-    exit 1
+  # This doesn't work on macOS so we'll skip it there
+  if [[ "$(uname)" != "Darwin" ]]; then
+    archive_size_kb=$(stat --printf="%s" "$archive_path" | awk '{print $1/1024}')
+    if ! enough_free_space "." "$archive_size_kb"; then
+      cecho "Less than $archive_size_kb KB of free space available on the current directory - not enough to extract this backup."
+      cecho "Please free up some space and try again."
+      exit 1
+    fi
   fi
 
   cecho "Extracting archive."