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It is typically used in a fakeroot environment during the final stages of a build process.
If you do this by hand, you end up with a 500-line Bash script full of losetup commands, sfdisk magic, and truncate hacks. It is fragile. If the partition sizes change by one megabyte, the script breaks. If you run it twice on the same machine, it might wipe your hard drive. genimage
BR2_ROOTFS_POST_IMAGE_SCRIPT="board/raspberrypi3/genimage.sh" BR2_PACKAGE_HOST_GENIMAGE=y It is typically used in a fakeroot environment
A: Yes, Buildroot heavily uses GenImage to generate final filesystem images. Yocto has equivalent tools but GenImage is a standalone utility. If the partition sizes change by one megabyte,
Genimage is a staple in the ecosystem, and for good reason. It integrates seamlessly into Makefiles. Because it only requires a config path and an output directory, wrapping it in a Makefile target takes seconds.
It turns the process of "making a disk" from a fragile ritual into a deterministic math problem.