Customize Pretix for our use

.gitlab-ci.yml

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+build-image:
+  image:
+    name: gcr.io/kaniko-project/executor:debug
+    entrypoint: [""]
+  script:
+    - mkdir -p /kaniko/.docker
+    - echo "{\"auths\":{\"${CI_REGISTRY}\":{\"auth\":\"$(printf "%s:%s" "${CI_REGISTRY_USER}" "${CI_REGISTRY_PASSWORD}" | base64 | tr -d '\n')\"}}}" > /kaniko/.docker/config.json
+    - >-
+      /kaniko/executor
+      --context "${CI_PROJECT_DIR}"
+      --dockerfile "${CI_PROJECT_DIR}/Dockerfile"
+      --destination "${IMAGE}"
+      --destination "${CI_REGISTRY_IMAGE}/ccchh-pretix:23.10.0"

Dockerfile

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+FROM docker.io/pretix/standalone:2023.10.0
+
+USER root
+COPY entrypoint.sh /
+RUN true \
+    && chmod +x /entrypoint.sh \
+    && touch /etc/pretix/pretix.cfg \
+    && chown pretixuser /etc/pretix/pretix.cfg \
+    && true
+
+USER pretixuser
+
+ENTRYPOINT /entrypoint.sh

README.md

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+# Pretix Customized for CCCHH
+
+The image adds an entrypoint script that creates `/etc/pretix/pretix.cfg` from environment variables at startup. The file is only created if it doesn't exist or is empty; this means that you can still mount your own config file into the container as with the original image.
+
+The script will fail and point out if required variables are not set.
+
+## Configuration
+
+The config file is created from a template, with environment variables substituted.
+
+```ini
+[pretix]
+instance_name=${PRETIX_INSTANCE_NAME}
+url=${PRETIX_URL}
+currency=${PRETIX_CURRENCY:-EUR}
+datadir=${PRETIX_DATADIR:-/data}
+trust_x_forwarded_for=${PRETIX_TRUST_X_FORWARDED_FOR:-on}
+trust_x_forwarded_proto=${PRETIX_TRUST_X_FORWARDED_PROTO:-on}
+
+[database]
+backend=${DATABASE_BACKEND}
+name=${DATABASE_NAME}
+user=${DATABASE_USER}
+password=${DATABASE_PASSWORD}
+host=${DATABASE_HOST}
+
+[mail]
+from=${MAIL_FROM}
+host=${MAIL_HOST}
+
+[redis]
+location=${REDIS_LOCATION}
+sessions=${REDIS_SESSION:-true}
+
+[celery]
+backend=${CELERY_BACKEND}
+broker=${CELERY_BROKER}
+EOF
+```
+
+## Updating the image
+
+You will need to look up the latest tag at https://hub.docker.com/r/pretix/standalone/tags and change it in both the `Dockerfile`` and in ``.gitlab-ci.yml`.
+
+## Testing the build
+
+```shell
+docker build -t ccchh-pretix:latest .
+```
+
+```shell
+docker run -it --rm --name pretix -e PRETIX_INSTANCE_NAME=foo -e PRETIX_URL=http://localhost -e DATABASE_BACKEND=postgresql -e DATABASE_NAME=postgres -e DATABASE_USER=postgres -e DATABASE_PASSWORD=geheim -e DATABASE_HOST=postgres -e MAIL_FROM=foo@example.com -e MAIL_HOST=mail -e REDIS_LOCATION=redis://redis/0 -e CELERY_BACKEND=redis://redis/0 -e CELERY_BROKER=redis://redis/1 ccchh-pretix```

entrypoint.sh

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+#!/bin/sh
+
+set -e
+
+if [ ! -s /etc/pretix/pretix.cfg ]; then
+    echo "Creating /etc/pretix/pretix.cfg from environment" >&2
+    missing=""
+    for i in PRETIX_INSTANCE_NAME PRETIX_URL DATABASE_BACKEND DATABASE_NAME DATABASE_USER DATABASE_PASSWORD DATABASE_HOST MAIL_FROM MAIL_HOST REDIS_LOCATION CELERY_BACKEND CELERY_BROKER; do
+        if eval "[ -z \"\${$i}\" ]"; then
+            missing="${missing} $i"
+        fi
+    done
+    if [ -n "${missing}" ]; then
+        echo "You need to set these environment variables to configure Pretix:$missing" >&2
+        exit 1
+    fi
+    cat >/etc/pretix/pretix.cfg  <<EOF
+[pretix]
+instance_name=${PRETIX_INSTANCE_NAME}
+url=${PRETIX_URL}
+currency=${PRETIX_CURRENCY:-EUR}
+datadir=${PRETIX_DATADIR:-/data}
+trust_x_forwarded_for=${PRETIX_TRUST_X_FORWARDED_FOR:-on}
+trust_x_forwarded_proto=${PRETIX_TRUST_X_FORWARDED_PROTO:-on}
+
+[database]
+backend=${DATABASE_BACKEND}
+name=${DATABASE_NAME}
+user=${DATABASE_USER}
+password=${DATABASE_PASSWORD}
+host=${DATABASE_HOST}
+
+[mail]
+from=${MAIL_FROM}
+host=${MAIL_HOST}
+
+[redis]
+location=${REDIS_LOCATION}
+sessions=${REDIS_SESSION:-true}
+
+[celery]
+backend=${CELERY_BACKEND}
+broker=${CELERY_BROKER}
+EOF
+fi
+
+exec pretix $@