Expanding OpenWrt squashfs image? (SDcard)

Installing and Using OpenWrt
7

I follow the instructions here with some modification.

  1. Install required PKGs
opkg update && opkg install block-mount kmod-fs-ext4 kmod-usb-storage kmod-usb-ohci kmod-usb-uhci e2fsprogs fdisk
  1. Create new partition, /dev/mmcblk0p3, and reboot
root@Rpi3:~# fdisk /dev/mmcblk0

Welcome to fdisk (util-linux 2.34).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.


Command (m for help): p
Disk /dev/mmcblk0: 14.43 GiB, 15485370368 bytes, 30244864 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x5452574f

Device         Boot Start    End Sectors  Size Id Type
/dev/mmcblk0p1 *     8192  49151   40960   20M  c W95 FAT32 (LBA)
/dev/mmcblk0p2      57344 581631  524288  256M 83 Linux

Command (m for help): n 
Partition type
   p   primary (2 primary, 0 extended, 2 free)
   e   extended (container for logical partitions)
Select (default p): p
Partition number (3,4, default 3): 
First sector (2048-30244863, default 2048): 5811632
Last sector, +/-sectors or +/-size{K,M,G,T,P} (5811632-30244863, default 30244863): 

Created a new partition 3 of type 'Linux' and of size 11.7 GiB.

Command (m for help): p
Disk /dev/mmcblk0: 14.43 GiB, 15485370368 bytes, 30244864 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x5452574f

Device         Boot   Start      End  Sectors  Size Id Type
/dev/mmcblk0p1 *       8192    49151    40960   20M  c W95 FAT32 (LBA)
/dev/mmcblk0p2        57344   581631   524288  256M 83 Linux
/dev/mmcblk0p3      5811632 30244863 24433232 11.7G 83 Linux

Command (m for help): w
The partition table has been altered.
Syncing disks.

root@Rpi3:~# reboot
  1. Format new partition
root@Rpi3:~# mkfs.ext4 /dev/mmcblk0p3 
mke2fs 1.44.5 (15-Dec-2018)
Discarding device blocks: done                            
Creating filesystem with 3054154 4k blocks and 764032 inodes
Filesystem UUID: 8f3f385e-2ee5-4618-b2e2-e5be282acef9
Superblock backups stored on blocks: 
	32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208

Allocating group tables: done                            
Writing inode tables: done                            
Creating journal (16384 blocks): done
Writing superblocks and filesystem accounting information: done
  1. Configuring rootfs_data, extroot, transferring the data and reboot
root@Rpi3:~# DEVICE="/dev/mmcblk0p3"
root@Rpi3:~# eval $(block info "${DEVICE}" | grep -o -e "UUID=\S*")
root@Rpi3:~# uci -q delete fstab.overlay
root@Rpi3:~# uci set fstab.overlay="mount"
root@Rpi3:~# uci set fstab.overlay.uuid="${UUID}"
root@Rpi3:~# uci set fstab.overlay.target="/overlay"
root@Rpi3:~# uci commit fstab
root@Rpi3:~# 
root@Rpi3:~# mount /dev/mmcblk0p3 /mnt
root@Rpi3:~# cp -a -f /overlay/. /mnt
root@Rpi3:~# umount /mnt
root@Rpi3:~# reboot
  1. Preserving software package lists across boots
root@Rpi3:~# sed -i -r -e "s/^(lists_dir\sext\s).*/\1\/usr\/lib\/opkg\/lists/" /etc/opkg.conf
root@Rpi3:~# opkg update

Or, modify /etc/opkg.conf in Web interface

  1. That's it and have a nice day
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