RESIZE SDCARD EXT4 IMAGE

resize.txt

#RESIZE SDCARD IMAGE

# $ fdisk -l img/2021-05-07-raspios-buster-armhf-lite.img 
# Disk img/2021-05-07-raspios-buster-armhf-lite.img: 1.76 GiB, 1874853888 bytes, 3661824 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: 0x9730496b

# Device                                        Boot  Start     End Sectors  Size Id Type
# img/2021-05-07-raspios-buster-armhf-lite.img1        8192  532479  524288  256M  c W95 FAT32 (LBA)
# img/2021-05-07-raspios-buster-armhf-lite.img2      532480 3661823 3129344  1.5G 83 Linux











dd if=/dev/zero of=img/2021-05-07-raspios-buster-armhf-lite.img bs=1 count=1 seek=$((512 * 9388032))

mknod /dev/loop0p1 b 259 0
mknod /dev/loop0p2 b 259 1

losetup --find --show --partscan img/2021-05-07-raspios-buster-armhf-lite.img

# Expand FS
fdisk /dev/loop0 <<EOF
d
2
n
p
2
532480
+3G
n
w
EOF

# Deallocate
losetup -D

# Fix
losetup --find --show --partscan img/2021-05-07-raspios-buster-armhf-lite.img
e2fsck -f /dev/loop0p2
resize2fs /dev/loop0p2










# $ fdisk -l img/2021-05-07-raspios-buster-armhf-lite.img 
# Disk img/2021-05-07-raspios-buster-armhf-lite.img: 4.79 GiB, 5120000000 bytes, 10000000 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: 0x9730496b

# Device                                        Boot  Start     End Sectors  Size Id Type
# img/2021-05-07-raspios-buster-armhf-lite.img1        8192  532479  524288  256M  c W95 FAT32 (LBA)
# img/2021-05-07-raspios-buster-armhf-lite.img2      532480 9999999 9467520  4.5G 83 Linux