virt/incus: Add support for building and running incus containers

configs/virt/incus/README.md

@@ -0,0 +1,33 @@
+# Containerized: Incus
+
+This package builds a SkiffOS system for use as a Incus container image.
+
+[Incus](https://linuxcontainers.org/incus/) containers are versatile system containers that, as opposed to application containers like docker, emulate a full init system by default ([more details here](https://linuxcontainers.org/incus/docs/main/explanation/containers_and_vms/)) and are therefore well suited for multi service/container deployments. Incus utilizes the [LXC](https://linuxcontainers.org/) APIs internally and provides a powerful toolset on top of them.
+
+Building and starting the container requires incus to be installed and running on the host and the executing user to be in the `incus-admin` group.
+
+## Example
+
+```bash
+SKIFF_CONFIG=virt/incus make configure compile # Compile the system
+make cmd/virt/incus/buildimage
+make cmd/virt/incus/run
+```
+
+Executing a shell in the container:
+
+```sh
+$ make cmd/virt/incus/exec
+# alternatively
+$ incus exec skiff -- sh
+```
+
+## Persistence
+
+When using the included command `cmd/virt/incus/run` for creating the container, a persistence volume will be created in the first incus storage pool available and attached to the container. If you want to reset the persistence volume, just delete it, so it will be recreated:
+
+```sh
+# You can find the right storage pool with:
+# incus storage list -c n -f csv | head -n 1
+incus volume delete "${STORAGE_POOL}" skiff-persist
+```

configs/virt/incus/buildroot/firmware

@@ -0,0 +1,3 @@
+# BR2_PACKAGE_LINUX_FIRMWARE is not set
+# BR2_PACKAGE_RTL8812AU_AIRCRACK_NG is not set
+# BR2_PACKAGE_RTL8821CU is not set

configs/virt/incus/buildroot/kernel

@@ -0,0 +1,2 @@
+# We don't need a kernel for Docker.
+# BR2_LINUX_KERNEL is not set

configs/virt/incus/buildroot/rootfs

@@ -0,0 +1,2 @@
+BR2_TARGET_ROOTFS_TAR=y
+# BR2_TARGET_ROOTFS_ISO9660 is not set

configs/virt/incus/buildroot/shell

@@ -0,0 +1,3 @@
+BR2_PACKAGE_BASH=y
+BR2_PACKAGE_WHICH=y
+BR2_SYSTEM_BIN_SH_BASH=y

configs/virt/incus/extensions/Makefile

@@ -0,0 +1,6 @@
+buildimage:
+	@$(SKIFF_CURRENT_CONF_DIR)/scripts/buildimage.sh
+run:
+	@$(SKIFF_CURRENT_CONF_DIR)/scripts/run.sh
+exec:
+	@$(SKIFF_CURRENT_CONF_DIR)/scripts/exec.sh

configs/virt/incus/metadata/commands

@@ -0,0 +1 @@
+run Start the incus container

configs/virt/incus/metadata/dependencies

@@ -0,0 +1 @@
+util/rootlogin

configs/virt/incus/metadata/description

@@ -0,0 +1 @@
+Run Skiff in an inucs container

configs/virt/incus/scripts/buildimage.sh

@@ -0,0 +1,37 @@
+#!/bin/bash
+set -ex
+
+IMAGE_NAME=skiffos/testing
+CONTAINER=skiff
+OUTPUT_PATH="$BUILDROOT_DIR/output"
+IMAGES_PATH="$BUILDROOT_DIR/images"
+WORKING_PATH="${BUILDROOT_DIR}/nspawn-run"
+PERSIST_PATH="${WORKING_PATH}/nspawn-persist"
+INCUS_IMAGE_PATH="${IMAGE_PATH}/incus.tar.gz"
+roottar="${IMAGES_PATH}/rootfs.tar"
+
+if ! command -v incus > /dev/null 2>&1
+then
+  echo "Failed to find the incus command. Is incus installed on your host system?"
+  exit 1
+fi
+
+mkdir -p "${PERSIST_PATH}"
+TMPDIR="${WORKING_PATH}/incus-tmp"
+trap 'rm -rf "$TMPDIR";' EXIT
+rm -rf "$TMPDIR"
+mkdir -p "${TMPDIR}/rootfs"
+tar -xf "$roottar" -C "$TMPDIR/rootfs"
+pushd "$TMPDIR"
+creationtime="$(date +%s)"
+default_metadata="architecture: x86_64
+creation_date: $creationtime
+properties:
+  description: SkiffOS
+  os: Linux x86
+  release: unknown"
+echo "${INCUS_METADATA:-"${default_metadata}"}" > "${TMPDIR}/metadata.yaml"
+tar caf "${INCUS_IMAGE_PATH}" rootfs metadata.yaml
+popd
+
+echo "Incus image generated successfully as ${IMAGE_NAME}"

configs/virt/incus/scripts/exec.sh

@@ -0,0 +1,14 @@
+#!/bin/bash
+set -e
+
+command -v incus > /dev/null 2>&1 || {
+  echo "Failed to find the incus command. Is incus installed on your host system?"
+  exit 1
+}
+
+incus show skiff > /dev/null || {
+  echo "Failed to find the skiff container. Did you execute \`make cmd/virt/incus/run\`?"
+  exit 1
+}
+
+incus exec skiff -- sh

configs/virt/incus/scripts/run.sh

@@ -0,0 +1,45 @@
+#!/bin/bash
+set -e
+
+IMAGE_NAME=skiffos/testing
+CONTAINER=skiff
+IMAGES_PATH="$BUILDROOT_DIR/images"
+INCUS_IMAGE_PATH="${IMAGE_PATH}/incus.tar.gz"
+
+if ! command -v incus > /dev/null 2>&1
+then
+  echo "Failed to find the incus command. Is incus installed on your host system?"
+  exit 1
+fi
+
+if ! [[ -f "${INCUS_IMAGE_PATH}" ]] > /dev/null
+then
+  echo "${INCUS_IMAGE_PATH} not found. Did you execute \`make cmd/virt/incus/buildimage\`?"
+  exit 1
+fi
+
+if incus image show "${IMAGE_NAME}" >/dev/null 2>&1
+then
+  incus image delete "${IMAGE_NAME}"
+fi
+incus image import --alias "${IMAGE_NAME}" "${INCUS_IMAGE_PATH}"
+
+storage_pool="$(incus storage list -c n -f csv | head -n 1)"
+
+if ! incus storage volume show "$storage_pool" skiff-persist >/dev/null 2>&1
+then 
+  incus storage volume create "$storage_pool" "skiff-persist"
+fi
+
+if incus show "${CONTAINER}"
+then
+  incus stop "${CONTAINER}" ||:
+  incus rm -f "${CONTAINER}" ||:
+fi
+
+incus create "${IMAGE_NAME}" "${CONTAINER}"
+incus storage volume attach "$storage_pool" skiff-persist skiff /mnt/persist
+#incus config device add "${CONTAINER}" images-disk source="${IMAGES_PATH}" path=/mnt/rootfs
+incus start "${CONTAINER}"
+
+echo "Incus container started as ${CONTAINER}."