new: [hugo] add ``hugo`` charm

Signed-off-by: Valentin Lab <valentin.lab@kalysto.org>

hugo/actions/generate

@@ -0,0 +1,53 @@
+#!/bin/bash
+## compose: no-hooks
+
+if [ -z "$SERVICE_DATASTORE" ]; then
+    echo "This script is meant to be run through 'compose' to work properly." >&2
+    exit 1
+fi
+
+. "$CHARM_PATH/lib/common"
+
+
+version=0.1
+usage="$exname [-h|--help]"
+help="
+USAGE:
+
+$usage
+
+DESCRIPTION:
+
+Generate website from current content.
+
+EXAMPLES:
+
+  $exname
+
+"
+
+
+dbname=
+output=
+while [ "$1" ]; do
+    case "$1" in
+        "--help"|"-h")
+            print_help >&2
+            exit 0
+            ;;
+        --*|-*)
+            err "Unexpected optional argument '$1'"
+            print_usage >&2
+            exit 1
+            ;;
+        *)
+            err "Unexpected positional argument '$1'"
+            print_usage >&2
+            exit 1
+        ;;
+    esac
+    shift
+done
+
+
+hugo:generate "$HOST_HUGO_SOURCE" "$HOST_HUGO_OUTPUT"

hugo/hooks/init

@@ -0,0 +1,21 @@
+#!/bin/bash
+
+## Init is run on host
+## For now it is run every time the script is launched, but
+## it should be launched only once after build.
+
+## Accessible variables are:
+## - SERVICE_NAME        Name of current service
+## - DOCKER_BASE_IMAGE   Base image from which this service might be built if any
+## - SERVICE_DATASTORE           Location on host of the DATASTORE of this service
+## - SERVICE_CONFIGSTORE         Location on host of the CONFIGSTORE of this service
+
+
+. lib/common
+
+set -e
+
+if ! [ -d "$HOST_HUGO_SOURCE" ]; then
+    hugo:init-dir || exit 1
+fi
+

hugo/hooks/pre_deploy

@@ -0,0 +1,12 @@
+#!/bin/bash
+## Should be executable N time in a row with same result.
+
+set -e
+
+. lib/common
+
+
+if ! [ -d "$HOST_HUGO_OUTPUT" ]; then
+    hugo:generate "$HOST_HUGO_SOURCE" "$HOST_HUGO_OUTPUT" || exit 1
+fi
+

hugo/hooks/publish_dir-relation-joined

@@ -0,0 +1,12 @@
+#!/bin/bash
+
+. lib/common
+
+set -e
+
+url=$(relation-get url) || exit 1
+
+mkdir -p "${HOST_HUGO_CONFIG}"
+cat <<EOF > "${HOST_HUGO_CONFIG}"/01-baseurl.yaml
+baseURL: $url
+EOF

hugo/lib/common

@@ -0,0 +1,65 @@
+# -*- mode: shell-script -*-
+
+HUGO_CONFIG="/etc/hugo"
+HUGO_BASE="/opt/apps/hugo"
+HUGO_SOURCE="$HUGO_BASE/src"
+HUGO_OUTPUT="$HUGO_BASE/output"
+HUGO_THEME="$HUGO_BASE/theme"
+
+
+HOST_HUGO_SOURCE="$SERVICE_DATASTORE$HUGO_BASE/src"
+HOST_HUGO_OUTPUT="$SERVICE_DATASTORE$HUGO_BASE/output"
+HOST_HUGO_THEME="$SERVICE_DATASTORE$HUGO_BASE/theme"
+HOST_HUGO_CONFIG="$SERVICE_CONFIGSTORE$HUGO_CONFIG"
+
+HUGO_BUILDER_DEFAULT_IMAGE="docker.0k.io/hugo:0.88.1"
+
+
+hugo:init-dir() {
+    mkdir -p "$HOST_HUGO_SOURCE" || return 1
+    cd "$HOST_HUGO_SOURCE" &&
+    git config --global user.email "compose@mail.com" &&
+        git config --global user.name "compose"  &&
+        docker run --rm -v "$HOST_HUGO_SOURCE":"$HUGO_SOURCE" \
+               -w "$HUGO_SOURCE" "$HUGO_BUILDER_DEFAULT_IMAGE" \
+               new site -f yaml . &&
+        docker run --rm -v "$HOST_HUGO_SOURCE":"$HUGO_SOURCE" \
+               -w "$HUGO_SOURCE" "$HUGO_BUILDER_DEFAULT_IMAGE" \
+               new posts/my-first-post.md &&
+        sed -ri '/^baseURL:/d' config.yaml &&
+        git init &&
+        git add -A . &&
+        git commit -m "First import"
+}
+
+
+hugo:generate() {
+    local src="$1" dst="$2" configs c
+
+    theme_url=$(options-get theme-url 2>/dev/null) || true
+    theme_url=${theme_url:-https://github.com/theNewDynamic/gohugo-theme-ananke.git}
+
+    if ! [ -d "$HOST_HUGO_THEME/default" ]; then
+        mkdir -p "$HOST_HUGO_THEME"
+        git clone "${theme_url}" "$HOST_HUGO_THEME/default" || {
+            err "Could not clone theme '$HOST_HUGO_THEME'."
+            return 1
+        }
+    fi
+    echo "theme: default" > "$HOST_HUGO_CONFIG/80-theme.yaml"
+    config_files=("$HOST_HUGO_CONFIG/"*.yaml)
+    configs=""
+    for c in "${config_files[@]}"; do
+        configs+="config${c#$SERVICE_CONFIGSTORE$HUGO_CONFIG},"
+    done
+    mkdir -p "$dst" || return 1
+    docker run --rm -v "$src":"$HUGO_SOURCE" \
+           -v "$dst":"$HUGO_OUTPUT" \
+           -v "$HOST_HUGO_CONFIG":"$HUGO_CONFIG" \
+           -v "$HOST_HUGO_THEME":"$HUGO_SOURCE/themes" \
+           -v "$HOST_HUGO_CONFIG":"$HUGO_SOURCE/config" \
+           -w "$HUGO_SOURCE" "$HUGO_BUILDER_DEFAULT_IMAGE" \
+           -D --config "${configs}config.yaml" \
+           -d "${dst#$SERVICE_DATASTORE}" &&
+    find "$HOST_HUGO_SOURCE" -depth -type d -empty -delete
+}

hugo/metadata.yml

@@ -0,0 +1,40 @@
+description: Hugo
+subordinate: true
+requires:
+  web-publishing-directory:
+    interface: publish-dir
+    scope: container
+data-resources:
+  - /opt/apps/hugo/output
+
+default-options:
+  # config:
+  #   language-code: "en-us"
+  #   title: "My Hugo Site"
+  #   theme: "ananke"
+
+uses:
+  publish-dir:
+    #constraint: required | recommended | optional
+    #auto: pair | summon | none ## default: pair
+    scope: container
+    constraint: required
+    auto: summon
+    solves:
+      container: "main running server"
+    default-options:
+      location: !var-expand "$DATASTORE/$BASE_SERVICE_NAME/opt/apps/hugo/output"
+  backup:
+    constraint: recommended
+    auto: pair
+    solves:
+      backup: "Automatic regular backup"
+    default-options:
+      ## First pattern matching wins, no pattern matching includes.
+      ## include-patterns are checked first, then exclude-patterns
+      ## Patterns rules:
+      ##  - ending / for directory
+      ##  - '*' authorized
+      ##  - must start with a '/', will start from $SERVICE_DATASTORE
+      exclude-patterns:
+        - "/opt/apps/hugo/output/"