Firecracker initrd creator

Create a initrd to be used as the Firecracker guest VM, based on Alpine

Requirements

Builds are done inside a container, so you need to have Podman or Docker installed.

Root permissions are not needed, this can run on rootless Podman / Docker.

Usage

./build.sh [options] [DISTRO-FLAVOR]

Create a initrd based on the specified distro flavor: alpine or suse.
If not specified, the alpine distro is used.

Options:

    -h             Show this help
    -k             Create an inirtd image from an existing rootfs at ./build/rootfs
    -z             Compress the initrd using gzip
    --minimal      Create a minimal image without networking

Build artifacts are placed inside ./build

A few words about the -k option:

1. Invoke the took as usual to create a stock initrd. This will leave a rootfs in ./build/rootfs.
2. The rootfs can be customized as desired.
3. Use the -k option to compress the customized rootfs.

TODO

Allow creating initrd for other distros.