Export device system

When the user has completed the deployment of the working environment
on one device, the current environment needs to be exported completely
to deploy to other devices in batches. The current development
environment can be backed up by exporting the device file system.

Exporting the device system is divided into two steps:

Export the Ubuntu root file system rootfs on the device;

Repackage the complete firmware, combine Ubuntu rootfs with other
partitions where the firmware is released, complete the secondary
packaging, and generate a new complete firmware.

Export device rootfs

Note that the following operations are all performed on the device
side.

In the Ubuntu environment of the device, install fireflydev:  sudo apt
update sudo apt install fireflydev

After installing fireflydev, you can use the ff_export_rootfs script
to export the root file system  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

Second package complete firmware

Note that the following operations are all performed on the PC (x86-64
architecture).

Install the necessary packages: sudo apt-get install lib32stdc++6

Download the secondary packaging tool: firefly-linux-repack

Unzip the secondary packaging tool:  tar -xzf firefly-linux-repack.tgz
cd firefly-linux-repack  The directory is as follows:  firefly-linux-
repack     ├── bin     │   ├── afptool     │   └── rkImageMaker
├── pack.sh # packaging script     ├── Readme_en.md     ├── Readme.md
└── unpack.sh # unpack script

Unpacking operation: Copy the official Ubuntu firmware to the firefly-
linux-repack root directory, rename it to update.img, and execute the
unpacking script unpack.sh. After the unpacking is complete, the
partition files are in the output directory.  mv /path/to/ROC-
RK3566-PC_Ubuntu18.04-r21156_v1.2.4a_220519.img update.img ./unpack.sh

Packaging operation: Keep the current directory structure and file
name unchanged, connect the mobile hard disk to the PC, replace
output/Image/rootfs.img with the Ubuntu rootfs exported earlier, and
then execute the packaging script pack.sh .  cp
/media/customer/1878-4615/Firefly_Ubuntu_18.04.6_rootfs.img /path/to
/firefly-linux-repack/output/Image/rootfs.img ./pack.sh

The new full firmware is new_update.img in the current directory.