Export device rootfs

1. In the Ubuntu environment of the device, install fireflydev:

   sudo apt update
   sudo apt install fireflydev

2. After installing fireflydev, you can use the ff_export_rootfs script to export the root file system Exporting to external storage devices or the /userdata/ root directory is allowed only; exporting to other directories on the device is prohibited.！

   • It is recommended to use a mobile hard disk with a larger capacity

   • The exporter does things like apt clean to reduce the filesystem size

   • Export the root file system, for example, to the /media/firefly/AC91-C4AE/ directory (it takes a while):

   ff_export_rootfs /media/firefly/AC91-C4AE/

   • Compress the file system, delete unnecessary blank space to reduce memory resource usage:

   # Some customers said that the size of the exported rootfs is 3.3G, but actually only 3G is used, because the rootfs is not compressed
   e2fsck -p -f Firefly_Ubuntu_18.04.6_rootfs.img
   resize2fs -M Firefly_Ubuntu_18.04.6_rootfs.img

Next step: firmware repack

After exporting rootfs, only the rootfs image file is generated. To create a complete flashable firmware image, use the firmware repack tool on the PC for secondary packaging. See: Firmware Repack Tool.