include script to set-owner-name

Dockerfile

@@ -7,8 +7,8 @@ RUN useradd --create-home app \
 WORKDIR /home/app
 RUN su app -c "npm install -g --prefix . wiki@0.11.4"
 RUN su app -c "mkdir .wiki"
-COPY configure-and-launch-wiki configure-and-launch-wiki
-RUN chown app configure-and-launch-wiki
+COPY configure-and-launch-wiki set-owner-name ./
+RUN chown app configure-and-launch-wiki set-owner-name
 VOLUME "/home/app/.wiki"
 ENV DOMAIN=localhost
 ENV OWNER_NAME="The Owner"

set-owner-name

@@ -0,0 +1,39 @@
+#!/bin/bash -eu
+set -o pipefail
+
+usage() {
+  cat <<EOF
+  Usage: $(basename $0) NAME
+
+  replaces the owner's name in $OWNER_FILE
+
+EOF
+}
+
+main() {
+  initialize-environment-vars $@ || { usage; exit 1; }
+  backup-and-save-name
+  report-success
+}
+
+initialize-environment-vars() {
+  readonly OWNER_FILE=/home/app/.wiki/$DOMAIN.owner.json
+  readonly OWNER_BACKUP_FILE=$OWNER_FILE-saved-$(date --iso-8601=minutes)
+  readonly NAME=${@:-missing}
+  [ ! "$NAME" == "missing" ]
+}
+
+backup-and-save-name() {
+  mv $OWNER_FILE $OWNER_BACKUP_FILE
+  jq ".name = \"$NAME\"" $OWNER_BACKUP_FILE > $OWNER_FILE
+}
+
+report-success() {
+  cat <<EOF
+  Owner's name changed to "$NAME"
+  Previous config is saved in ${OWNER_BACKUP_FILE##$PWD/}
+
+EOF
+}
+
+main "$@"