#!/usr/bin/env bash
# http://github.com/containers/libpod/blob/master/docs/tutorials/podman_tutorial.md

# Buildah and podman are redhats implementation of docker containers.

# Main configuration files:
#    /etc/containers/registries.conf – configuration file which specifies which container registries should be consulted when completing image names which do not include a registry or domain portion.
#    /etc/containers/mounts.conf – specify volume mount directories that are automatically mounted inside containers when executing the podman run or podman build commands
#    /etc/containerd/config.toml – configuration file for containerd

# podman            # tool to manage containers and pods
# podman-compose    # Run docker-compose.yml using podman
# podman-remote     # tool to manage containers and pods (remote CLI)
# podman-toolbox    # unprivileged development environment using containers
# aardvark-dns      # Container-focused DNS server

# podman-docker conflicts with docker-ce and results in its removal.
# podman-docker     # tool to manage containers and pods (Docker CLI)

# Recommends
# buildah                     # CLI tool to facilitate building OCI images
# tini                        # tiny but valid init for containers
# catatonit                   # init process for containers
# dumb-init                   # wrapper script which proxies signals to a child
# containers-storage          # CLI tools for handling how containers are stored on disk
# dbus-user-session
# passt                       # user-mode networking daemons for virtual machines and namespaces
# criu                        # checkpoint and restore in userspace
# libcriu2                    # checkpoint and restore in userspace (library)
# slirp4netns                 # User-mode networking for unprivileged network namespaces
# containernetworking-plugins # standard networking plugins - binaries

# Update system
sudo apt -y update -qq
sudo apt install \
  podman \
  podman-compose \
  podman-remote \
  podman-toolbox \
  aardvark-dns

# Shared mount
#
# WARN[0000] "/" is not a shared mount, this could cause issues or missing
# mounts with rootless containers
#
# Containers on linux might require filesystems to be mounted with different
# propagation than the kernel default of 'private'.
#
# $ findmnt -o PROPAGATION /
#
# will produce the following output:
#
# PROPAGATION
# private

conf_print_shared_root() {
  cat <<EOF
#!/bin/sh
mount --make-rshared /
EOF
}
# conf_print_shared_root | sudo tee /etc/

# $ findmnt -o PROPAGATION /
#
# will produce the following output:
#
# PROPAGATION
# shared
#
# conf_print_storage() {
#   cat <<EOF
# [storage]
# driver = "overlay"
# EOF
# }
# conf_print_storage > /etc/containers/storage.conf
#
#
#
# Install pre-requisites
# sudo apt -y install \
#  gcc \
#  make \
#  cmake \
#  git \
#  btrfs-progs \
#  golang-go \
#  go-md2man \
#  iptables \
#  libassuan-dev \
#  libc6-dev \
#  libdevmapper-dev \
#  libglib2.0-dev \
#  libgpgme-dev \
#  libgpg-error-dev \
#  libostree-dev \
#  libprotobuf-dev \
#  libprotobuf-c-dev \
#  libseccomp-dev \
#  libselinux1-dev \
#  libsystemd-dev \
#  pkg-config \
#  runc \
#  uidmap \
#  libapparmor-dev

# Install conmon
#   git clone http://github.com/containers/conmon
# cd conmon
# make
# sudo make podman
# sudo cp /usr/local/libexec/podman/conmon  /usr/local/bin/

# Install CNI plugins
# git clone http://github.com/containernetworking/plugins.git $GOPATH/src/github.com/containernetworking/plugins
# cd $GOPATH/src/github.com/containernetworking/plugins
# ./build_linux.sh
# sudo mkdir -p /usr/libexec/cni
# sudo cp bin/* /usr/libexec/cni

# Setup CNI networking
# sudo mkdir -p /etc/cni/net.d
# curl -qsSL https://raw.githubusercontent.com/containers/libpod/master/cni/87-podman-bridge.conflist | sudo tee /etc/cni/net.d/99-loopback.conf

# Populate configuration files
# sudo mkdir -p /etc/containers
# sudo curl https://raw.githubusercontent.com/projectatomic/registries/master/registries.fedora -o /etc/containers/registries.conf
# sudo curl https://raw.githubusercontent.com/containers/skopeo/master/default-policy.json -o /etc/containers/policy.json

# Install Podman
# git clone http://github.com/containers/libpod/ $GOPATH/src/github.com/containers/libpod
# cd $GOPATH/src/github.com/containers/libpod
# make
# sudo make install

# podman version
# podman info