unsquashfs -d "$TEMP/rootfs" "$SNAP" dd if=/dev/zero of="$OUT" bs=1M count=512 mkfs.ext4 "$OUT" mkdir -p /mnt/img mount "$OUT" /mnt/img cp -a "$TEMP/rootfs/" /mnt/img/ umount /mnt/img rm -rf "$TEMP"
| Flag | Description | |------|-------------| | --size <MB> | Image size in MB (default: 2048) | | --kernel <file> | External kernel (overrides snap’s own) | | --initramfs <file> | External initramfs | | --bootloader <grub/uboot> | Bootloader type (default: grub) | | --arch <amd64/arm64> | Target architecture | | --compress gz/xz | Compress output image | 3.1 Convert a Simple Application Snap Assume you have hello-world_1.0.snap – a basic snap that prints "Hello". snap2img
echo "Image created: $OUT (no bootloader – not bootable alone)" For a truly bootable image, add partition table, kernel, and bootloader as described in Section 2. add partition table
#!/bin/bash # Minimal version using unsquashfs and dd SNAP="$1" OUT="$2" TEMP=$(mktemp -d) snap2img