hulthe
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slim now works with any Containerfile by injecting distro-agnostic scripts at build time: - /slim/init: mounts special filesystems, configures networking (static QEMU slirp), sets up cgroup2, timezone, and rootless container prereqs. Parses slim.cmd=<base64> from the kernel cmdline for runtime overrides, otherwise execs /slim/exec. - /slim/exec: generated from the image's CMD/ENTRYPOINT (via podman image inspect), overridable via --cmd at build and run time. Changes: - New src/inject.rs: inspect image config, infer command, generate /slim/exec script, inject /slim/ into mounted rootfs - New src/scripts/slim-init.sh: the universal init script (include_str!) - build.rs: rename --init to --cmd, inject scripts before packing, drop Meta::save, restructure to ensure unmount always runs - qemu.rs: hardcode init=/slim/init, add --cmd (base64 on cmdline), drop Meta::load, add -no-reboot - Remove src/meta.rs and meta.toml (no longer needed) - Cargo.toml: add serde_json + base64, remove unused walkdir + cpio + toml - Example Containerfiles simplified to plain FROM + CMD - New example/test.sh for manual verification - README updated for new workflow
slim
Turning containers into bootable VMs
Example
# Build the container
podman build ./example/alpine -t slim-alpine
# Make the container bootable. slim injects /slim/init and /slim/exec,
# then packs the rootfs as a qcow2 disk.
slim build qcow2 slim-alpine
# Boot the image using QEMU. The container's CMD runs automatically.
slim run slim-alpine
# Override the command at runtime (base64-encoded on the kernel cmdline):
slim run slim-alpine --cmd '/bin/sh'
# Override the command at build time (baked into /slim/exec):
slim build qcow2 slim-alpine --cmd '/bin/sh'
# Cleanup
slim image rm slim-alpine
podman image rm slim-alpine
Kernel
slim boots VMs using a shared kernel at $XDG_DATA_HOME/slim-rs/vmlinuz.
Place a suitable x86 bzImage there before running slim run.