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Docker from scratch image ofTinycore Linux

To build on top of it, just pull from thedocker-tinycore package

echo FROM ghcr.io/innovarew/docker-tinycore > Dockerfiledocker build -t docker-tinycore-scratch .

To run, justdocker run as show below:

sudo docker run -it ghcr.io/innovarew/docker-tinycore:latest

To build locally, justmake as show below:

# prepare the rootfs, build, and run the containersudo make TC_URL=http://tinycorelinux.net/15.x/x86_64/

Ready to use docker images fromdocker-tinycore (see link on how-to use):

What goes on under the hood is shown below:

cat > Dockerfile <<EOFFROM scratchADD data/rootfs-x86_64-15.x.tar.xz /EOF# unpack tinycore rootfs, sudo needed to unpack cpio proper permssudo scripts/tc-docker tce_rootfs_init data/# build and run the tinycore docker containersudo docker build -t docker-tinycore-local:latest .sudo docker run -it docker-tinycore-local:latest /bin/sh

tc-docker provides the main functionalities for running tinycore on docker:

• First, providestc-docker tce_rootfs_init that extracts the rootfs of a tinycore ISO image.This rootfs, can then be used on aDockerfile, usingFROM scratch and adding the rootfs.

• Second, providestc-docker tce_install ext.tcz root/, that fetches a ext.tcz and unpacks it underroot/.This allows to installsquashfs-tools.tcz, so the running container can useunsquashfs to install tcz extensions into the designatedroot/.

• Last, once tinycorerootfs, and,unsquashfs are in place inside the container, thetce-load -wi whois command can be used on the running container to install new extensions.

One limitation of this approach is that if for any reason theunsquashfs stops working, saysquashfs-tools.tcz or any of its dependences is removed then,tce-load stops working, and the ability of installing new tce extensions is lost.

A benefit of using the TinyCore ISO image as source, is that extensions shipped inside the TinyCore ISO under<iso>/cde are available, and can be provided as a docker volume to be used for shipping as offline extensions without requiring download.