Sync the grub cmdline changes before exiting (#24)

* Fix: exit on failures during defrag operation and add verbose logging

* After updating GRUB configuration to enable hibernation, the tool does not ensure that these changes
are fully committed to disk. On some filesystems, committing can take tens or even hundreds of seconds.
If a hibernation request occurs before the commit completes, the subsequent resume fails because the
resume and resume_offset parameters are missing from the kernel command line.

To prevent this, the changes to the GRUB cmdline must be explicitly committed to disk. This requires:

1. sync() to flush data buffers, and

2. fsfreeze/unfreeze to flush filesystem metadata and ensure the journal is clean.

---------

Co-authored-by: root <root@DESKTOP-UT47VEB>

Author: shradhagupta6

hibernation-setup-tool.c

@@ -1259,6 +1259,23 @@ static bool update_kernel_cmdline_params_for_grub(
         }
     }
 
+    if (is_exec_in_path("sync")) {
+	     log_info("sync the grub cmdline changes to disk");
+	     spawn_and_wait("sync", 0);
+    }
+    /*
+     * If the underlying filesystem is a journaling filesystem, and hibernation is triggered immediately
+     * after these updates are done, sometimes the initramfs during resume ends up reading the older grub
+     * cmdline(without the resume and resume_offset param). This is because the metadata for these files
+     * does not get updated immediately. We need to force this by flushing the fs journal after successfully
+     * making the grub cmdline changes
+     */
+    if (is_exec_in_path("fsfreeze")) {
+	    log_info("force fs journal flush by freezing/unfreezing filesystem using fsfreeze");
+	    spawn_and_wait("fsfreeze", 2, "-f", "/boot");
+	    spawn_and_wait("fsfreeze", 2, "-u", "/boot");
+    }
+
     free(args);
 
     return ret_value;