LXC: add LXC tooling box (initial, WIP)

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

Makefile

@@ -75,6 +75,7 @@ test: test.pep8 test.unit test.sh test.robot
 	- make pylint
 
 test.sh:
+	shellcheck -x utils/lxc.sh
 	shellcheck -x utils/lib.sh
 	shellcheck -x utils/filtron.sh
 	shellcheck -x utils/searx.sh

utils/lxc.sh

@@ -0,0 +1,152 @@
+#!/usr/bin/env bash
+# -*- coding: utf-8; mode: sh indent-tabs-mode: nil -*-
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+# shellcheck source=utils/lib.sh
+source "$(dirname "${BASH_SOURCE[0]}")/lib.sh"
+source_dot_config
+
+# ----------------------------------------------------------------------------
+# config
+# ----------------------------------------------------------------------------
+
+# name of https://images.linuxcontainers.org
+LINUXCONTAINERS_ORG_NAME="${LINUXCONTAINERS_ORG_NAME:-images}"
+HOST_PREFIX="${HOST_PREFIX:-searx}"
+
+TEST_IMAGES=(
+    "$LINUXCONTAINERS_ORG_NAME:ubuntu/18.04"  "ubu1804"
+    "$LINUXCONTAINERS_ORG_NAME:ubuntu/19.04"  "ubu1904"
+    "$LINUXCONTAINERS_ORG_NAME:archlinux"     "archlinux"
+    #"$LINUXCONTAINERS_ORG_NAME:fedora/31"     "fedora31"
+    #"ubuntu-minimal:18.04"  "ubu1804"
+    #"ubuntu-minimal:19.10"  "ubu1910"
+)
+
+REMOTE_IMAGES=()
+LOCAL_IMAGES=()
+
+for ((i=0; i<${#TEST_IMAGES[@]}; i+=2)); do
+    REMOTE_IMAGES=("${REMOTE_IMAGES[@]}" "${TEST_IMAGES[i]}")
+    LOCAL_IMAGES=("${LOCAL_IMAGES[@]}" "${TEST_IMAGES[i+1]}")
+done
+
+# ----------------------------------------------------------------------------
+usage() {
+# ----------------------------------------------------------------------------
+
+    cat <<EOF
+
+usage::
+
+  $(basename "$0") build [hosts]
+  $(basename "$0") delete [hosts]
+
+build / delete
+  build and/or delete all LXC hosts
+
+all LXC hosts:
+  ${LOCAL_IMAGES[@]}
+
+EOF
+    [ ! -z "${1+x}" ] &&  err_msg "$1"
+}
+
+main() {
+    rst_title "LXC tooling box" part
+
+    required_commands lxc || exit
+
+    local _usage="unknown or missing $1 command $2"
+
+    case $1 in
+        --source-only)  ;;
+        -h|--help) usage; exit 0;;
+
+        build)
+            sudo_or_exit
+            case $2 in
+                hosts) build_instances ;;
+                *) usage "$_usage"; exit 42;;
+            esac ;;
+        delete)
+            sudo_or_exit
+            case $2 in
+                hosts) delete_instances ;;
+                *) usage "$_usage"; exit 42;;
+            esac ;;
+        *)
+            usage "unknown or missing command $1"; exit 42;;
+    esac
+}
+
+build_instances() {
+    rst_title "Build LXC instances"
+    lxc_copy_images_localy
+    lxc_init_containers
+
+    err_msg "WIP / sorry, not implemented yet :o"
+}
+
+delete_instances() {
+    rst_title "Delete LXC instances"
+    echo -en "\\nLXC hosts(s)::\\n\\n  ${LOCAL_IMAGES[*]}\\n" | $FMT
+    if ask_yn "Do you really want to delete all images"; then
+        lxc_delete_containers
+    fi
+}
+
+lxc_copy_images_localy() {
+    echo
+    for ((i=0; i<${#TEST_IMAGES[@]}; i+=2)); do
+        if lxc image info "local:${TEST_IMAGES[i+1]}" &>/dev/null; then
+            info_msg "image ${TEST_IMAGES[i]} already copied --> ${TEST_IMAGES[i+1]}"
+        else
+            info_msg "copy image locally ${TEST_IMAGES[i]} --> ${TEST_IMAGES[i+1]}"
+            lxc image copy "${TEST_IMAGES[i]}" local: \
+                --alias  "${TEST_IMAGES[i+1]}" prefix_stdout
+        fi
+    done
+    #lxc image list local:
+}
+
+lxc_delete_images_localy() {
+    echo
+    for i in "${LOCAL_IMAGES[@]}"; do
+        info_msg "delete image 'local:$i'"
+        lxc image delete "local:$i"
+    done
+    #lxc image list local:
+}
+
+lxc_init_containers() {
+    echo
+    for i in "${LOCAL_IMAGES[@]}"; do
+        if lxc info "$HOST_PREFIX-$i" &>/dev/null; then
+            info_msg "conatiner '$HOST_PREFIX-$i' already exists"
+        else
+            info_msg "create conatiner instance: $HOST_PREFIX-$i"
+            lxc init "local:$i" "$HOST_PREFIX-$i"
+        fi
+    done
+    #lxc list "$HOST_PREFIX"
+}
+
+lxc_delete_containers() {
+    echo
+    for i in "${LOCAL_IMAGES[@]}"; do
+        if lxc info "$HOST_PREFIX-$i" &>/dev/null; then
+            info_msg "stop & delete instance '$HOST_PREFIX-$i'"
+            lxc stop "$HOST_PREFIX-$i" &>/dev/null
+            lxc delete "$HOST_PREFIX-$i" | prefix_stdout
+        else
+            warn_msg "instance '$HOST_PREFIX-$i' does not exist / can't delete :o"
+        fi
+    done
+    #lxc list "$HOST_PREFIX"
+}
+
+
+# ----------------------------------------------------------------------------
+main "$@"
+# ----------------------------------------------------------------------------