fstool 0.4.12

Build disk images and filesystems (ext2/3/4, MBR, GPT) from a directory tree and TOML spec, in the spirit of genext2fs.
Documentation 
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# Example fstool spec: a Raspberry Pi SD-card image.
#
#   fstool build examples/raspberry-pi.toml -o /tmp/rpi.img
#   fstool info /tmp/rpi.img            # lists the MBR partitions
#   fstool ls   /tmp/rpi.img:1 /        # the FAT boot partition
#   fstool ls   /tmp/rpi.img:2 /        # the ext4 root partition
#
# The classic Raspberry Pi layout: an MBR disk with a FAT32 *boot* partition
# (the GPU firmware only reads FAT) followed by an ext4 *root* partition.
# fstool lays out the partitions and formats both filesystems; populate them
# from host directories by uncommenting the `source` lines below.

[image]
# Total card size. Use the smallest real card you target; the root
# partition grows to fill whatever is left.
size = "2GiB"
partition_table = "mbr"

# --- Partition 1: boot (FAT32) -------------------------------------------
# Holds the firmware (bootcode.bin, start*.elf, fixup*.dat), the kernel
# (kernel*.img), config.txt and cmdline.txt. MBR type "fat" = 0x0C
# (W95 FAT32 LBA), which the Pi firmware looks for.
[[partitions]]
name = "boot"
type = "fat"
size = "256MiB"

[partitions.filesystem]
type = "fat32"
volume_label = "boot"
# source = "./boot"   # firmware + kernel + config.txt + cmdline.txt

# --- Partition 2: root (ext4) --------------------------------------------
# `size = "remaining"` fills the rest of the card. Must be the last entry.
[[partitions]]
name = "root"
type = "linux"
size = "remaining"

[partitions.filesystem]
type = "ext4"
volume_label = "rootfs"
# Pre-populate /dev so the system has console/null/zero/tty/… on first boot.
rootdevs = "standard"
# source = "./rootfs"   # your root tree (point cmdline.txt root= at /dev/mmcblk0p2)