Initial Commit

.dockerignore

@@ -0,0 +1 @@
+dcmerge

.drone.yml

@@ -0,0 +1,862 @@
+---
+kind: pipeline
+type: kubernetes
+name: linter
+
+clone:
+  disable: true
+
+platform:
+  os: linux
+
+steps:
+- name: clone
+  image: git.cryptic.systems/volker.raschek/git:1.2.1
+
+- name: markdown lint
+  commands:
+  - markdownlint *.md
+  image: git.cryptic.systems/volker.raschek/markdownlint:0.35.0
+  resources:
+    limits:
+      cpu: 150
+      memory: 150M
+
+- name: email-notification
+  environment:
+    SMTP_FROM_ADDRESS:
+      from_secret: smtp_from_address
+    SMTP_FROM_NAME:
+      from_secret: smtp_from_name
+    SMTP_HOST:
+      from_secret: smtp_host
+    SMTP_USERNAME:
+      from_secret: smtp_username
+    SMTP_PASSWORD:
+      from_secret: smtp_password
+  image: git.cryptic.systems/volker.raschek/drone-email:0.1.2
+  resources:
+    limits:
+      cpu: 150
+      memory: 150M
+  when:
+    status:
+    - changed
+    - failure
+
+trigger:
+  event:
+    exclude:
+    - tag
+
+---
+kind: pipeline
+type: docker
+name: dry-run-amd64
+
+clone:
+  disable: true
+
+depends_on:
+- linter
+
+platform:
+  os: linux
+  arch: amd64
+
+steps:
+- name: clone
+  image: git.cryptic.systems/volker.raschek/git:1.2.1
+
+- name: build
+  image: docker.io/plugins/docker:20.10.9
+  settings:
+    auto_tag: false
+    dockerfile: Dockerfile
+    dry_run: true
+    force_tag: true
+    no_cache: true
+    purge: true
+    mirror:
+      from_secret: docker_io_mirror
+    registry: git.cryptic.systems
+    repo: git.cryptic.systems/volker.raschek/dcmerge
+    tags: latest-amd64
+    username:
+      from_secret: git_cryptic_systems_container_registry_user
+    password:
+      from_secret: git_cryptic_systems_container_registry_password
+
+- name: email-notification
+  environment:
+    SMTP_FROM_ADDRESS:
+      from_secret: smtp_from_address
+    SMTP_FROM_NAME:
+      from_secret: smtp_from_name
+    SMTP_HOST:
+      from_secret: smtp_host
+    SMTP_USERNAME:
+      from_secret: smtp_username
+    SMTP_PASSWORD:
+      from_secret: smtp_password
+  image: git.cryptic.systems/volker.raschek/drone-email:0.1.2
+  when:
+    status:
+    - changed
+    - failure
+
+trigger:
+  branch:
+    exclude:
+    - master
+  event:
+  - pull_request
+  - push
+  repo:
+  - volker.raschek/dcmerge
+
+---
+kind: pipeline
+type: docker
+name: dry-run-arm-v7
+
+clone:
+  disable: true
+
+depends_on:
+- linter
+
+platform:
+  os: linux
+  arch: arm
+
+steps:
+- name: clone
+  image: git.cryptic.systems/volker.raschek/git:1.2.1
+
+- name: build
+  image: docker.io/plugins/docker:20.10.9
+  settings:
+    auto_tag: false
+    dockerfile: Dockerfile
+    dry_run: true
+    force_tag: true
+    no_cache: true
+    purge: true
+    mirror:
+      from_secret: docker_io_mirror
+    registry: git.cryptic.systems
+    repo: git.cryptic.systems/volker.raschek/dcmerge
+    tags: latest-arm-v7
+    username:
+      from_secret: git_cryptic_systems_container_registry_user
+    password:
+      from_secret: git_cryptic_systems_container_registry_password
+
+- name: email-notification
+  environment:
+    SMTP_FROM_ADDRESS:
+      from_secret: smtp_from_address
+    SMTP_FROM_NAME:
+      from_secret: smtp_from_name
+    SMTP_HOST:
+      from_secret: smtp_host
+    SMTP_USERNAME:
+      from_secret: smtp_username
+    SMTP_PASSWORD:
+      from_secret: smtp_password
+  image: git.cryptic.systems/volker.raschek/drone-email:0.1.2
+  when:
+    status:
+    - changed
+    - failure
+
+trigger:
+  branch:
+    exclude:
+    - master
+  event:
+  - pull_request
+  - push
+  repo:
+  - volker.raschek/dcmerge
+
+---
+kind: pipeline
+type: docker
+name: dry-run-arm64-v8
+
+clone:
+  disable: true
+
+depends_on:
+- linter
+
+platform:
+  os: linux
+  arch: arm64
+
+steps:
+- name: clone
+  image: git.cryptic.systems/volker.raschek/git:1.2.1
+
+- name: build
+  image: docker.io/plugins/docker:20.10.9
+  settings:
+    auto_tag: false
+    dockerfile: Dockerfile
+    dry_run: true
+    force_tag: true
+    no_cache: true
+    purge: true
+    mirror:
+      from_secret: docker_io_mirror
+    registry: git.cryptic.systems
+    repo: git.cryptic.systems/volker.raschek/dcmerge
+    tags: latest-arm64-v8
+    username:
+      from_secret: git_cryptic_systems_container_registry_user
+    password:
+      from_secret: git_cryptic_systems_container_registry_password
+
+- name: email-notification
+  environment:
+    SMTP_FROM_ADDRESS:
+      from_secret: smtp_from_address
+    SMTP_FROM_NAME:
+      from_secret: smtp_from_name
+    SMTP_HOST:
+      from_secret: smtp_host
+    SMTP_USERNAME:
+      from_secret: smtp_username
+    SMTP_PASSWORD:
+      from_secret: smtp_password
+  image: git.cryptic.systems/volker.raschek/drone-email:0.1.2
+  when:
+    status:
+    - changed
+    - failure
+
+trigger:
+  branch:
+    exclude:
+    - master
+  event:
+  - pull_request
+  - push
+  repo:
+  - volker.raschek/dcmerge
+
+---
+kind: pipeline
+type: docker
+name: latest-amd64
+
+clone:
+  disable: true
+
+depends_on:
+- linter
+
+platform:
+  os: linux
+  arch: amd64
+
+steps:
+- name: clone
+  image: git.cryptic.systems/volker.raschek/git:1.2.1
+
+- name: build
+  image: docker.io/plugins/docker:20.10.9
+  settings:
+    auto_tag: false
+    dockerfile: Dockerfile
+    force_tag: true
+    no_cache: true
+    purge: true
+    mirror:
+      from_secret: docker_io_mirror
+    registry: git.cryptic.systems
+    repo: git.cryptic.systems/volker.raschek/dcmerge
+    tags: latest-amd64
+    username:
+      from_secret: git_cryptic_systems_container_registry_user
+    password:
+      from_secret: git_cryptic_systems_container_registry_password
+
+- name: email-notification
+  environment:
+    SMTP_FROM_ADDRESS:
+      from_secret: smtp_from_address
+    SMTP_FROM_NAME:
+      from_secret: smtp_from_name
+    SMTP_HOST:
+      from_secret: smtp_host
+    SMTP_USERNAME:
+      from_secret: smtp_username
+    SMTP_PASSWORD:
+      from_secret: smtp_password
+  image: git.cryptic.systems/volker.raschek/drone-email:0.1.2
+  when:
+    status:
+    - changed
+    - failure
+
+trigger:
+  branch:
+  - master
+  event:
+  - cron
+  - push
+  repo:
+  - volker.raschek/dcmerge
+
+---
+kind: pipeline
+type: docker
+name: latest-arm-v7
+
+clone:
+  disable: true
+
+depends_on:
+- linter
+
+platform:
+  os: linux
+  arch: arm
+
+steps:
+- name: clone
+  image: git.cryptic.systems/volker.raschek/git:1.2.1
+
+- name: build
+  image: docker.io/plugins/docker:20.10.9
+  settings:
+    auto_tag: false
+    dockerfile: Dockerfile
+    force_tag: true
+    no_cache: true
+    purge: true
+    mirror:
+      from_secret: docker_io_mirror
+    registry: git.cryptic.systems
+    repo: git.cryptic.systems/volker.raschek/dcmerge
+    tags: latest-arm-v7
+    username:
+      from_secret: git_cryptic_systems_container_registry_user
+    password:
+      from_secret: git_cryptic_systems_container_registry_password
+
+- name: email-notification
+  environment:
+    SMTP_FROM_ADDRESS:
+      from_secret: smtp_from_address
+    SMTP_FROM_NAME:
+      from_secret: smtp_from_name
+    SMTP_HOST:
+      from_secret: smtp_host
+    SMTP_USERNAME:
+      from_secret: smtp_username
+    SMTP_PASSWORD:
+      from_secret: smtp_password
+  image: git.cryptic.systems/volker.raschek/drone-email:0.1.2
+  when:
+    status:
+    - changed
+    - failure
+
+trigger:
+  branch:
+  - master
+  event:
+  - cron
+  - push
+  repo:
+  - volker.raschek/dcmerge
+
+---
+kind: pipeline
+type: docker
+name: latest-arm64-v8
+
+clone:
+  disable: true
+
+depends_on:
+- linter
+
+platform:
+  os: linux
+  arch: arm64
+
+steps:
+- name: clone
+  image: git.cryptic.systems/volker.raschek/git:1.2.1
+
+- name: build
+  image: docker.io/plugins/docker:20.10.9
+  settings:
+    auto_tag: false
+    dockerfile: Dockerfile
+    force_tag: true
+    no_cache: true
+    purge: true
+    mirror:
+      from_secret: docker_io_mirror
+    registry: git.cryptic.systems
+    repo: git.cryptic.systems/volker.raschek/dcmerge
+    tags: latest-arm64-v8
+    username:
+      from_secret: git_cryptic_systems_container_registry_user
+    password:
+      from_secret: git_cryptic_systems_container_registry_password
+
+- name: email-notification
+  environment:
+    SMTP_FROM_ADDRESS:
+      from_secret: smtp_from_address
+    SMTP_FROM_NAME:
+      from_secret: smtp_from_name
+    SMTP_HOST:
+      from_secret: smtp_host
+    SMTP_USERNAME:
+      from_secret: smtp_username
+    SMTP_PASSWORD:
+      from_secret: smtp_password
+  image: git.cryptic.systems/volker.raschek/drone-email:0.1.2
+  when:
+    status:
+    - changed
+    - failure
+
+trigger:
+  branch:
+  - master
+  event:
+  - cron
+  - push
+  repo:
+  - volker.raschek/dcmerge
+
+---
+kind: pipeline
+type: kubernetes
+name: latest-manifest
+
+clone:
+  disable: true
+
+depends_on:
+- latest-amd64
+- latest-arm-v7
+- latest-arm64-v8
+
+# docker.io/plugins/manifest only for amd64 architectures available
+node_selector:
+  kubernetes.io/os: linux
+  kubernetes.io/arch: amd64
+
+steps:
+- name: clone
+  image: git.cryptic.systems/volker.raschek/git:1.2.1
+
+- name: build-manifest
+  image: docker.io/plugins/manifest:1.4.0
+  settings:
+    auto_tag: false
+    ignore_missing: true
+    spec: manifest.tmpl
+    username:
+      from_secret: git_cryptic_systems_container_registry_user
+    password:
+      from_secret: git_cryptic_systems_container_registry_password
+
+- name: email-notification
+  environment:
+    SMTP_FROM_ADDRESS:
+      from_secret: smtp_from_address
+    SMTP_FROM_NAME:
+      from_secret: smtp_from_name
+    SMTP_HOST:
+      from_secret: smtp_host
+    SMTP_USERNAME:
+      from_secret: smtp_username
+    SMTP_PASSWORD:
+      from_secret: smtp_password
+  image: git.cryptic.systems/volker.raschek/drone-email:0.1.2
+  resources:
+    limits:
+      cpu: 150
+      memory: 150M
+  when:
+    status:
+    - changed
+    - failure
+
+trigger:
+  branch:
+  - master
+  event:
+  - cron
+  - push
+  repo:
+  - volker.raschek/dcmerge
+
+---
+kind: pipeline
+type: kubernetes
+name: latest-sync
+
+clone:
+  disable: true
+
+depends_on:
+- latest-manifest
+
+steps:
+- name: clone
+  image: git.cryptic.systems/volker.raschek/git:1.2.1
+
+- name: latest-sync
+  commands:
+  - skopeo sync --all --src=docker --src-creds=$SRC_CRED_USERNAME:$SRC_CRED_PASSWORD --dest=docker --dest-creds=$DEST_CRED_USERNAME:$DEST_CRED_PASSWORD git.cryptic.systems/volker.raschek/dcmerge docker.io/volkerraschek
+  environment:
+    SRC_CRED_USERNAME:
+      from_secret: git_cryptic_systems_container_registry_user
+    SRC_CRED_PASSWORD:
+      from_secret: git_cryptic_systems_container_registry_password
+    DEST_CRED_USERNAME:
+      from_secret: container_image_registry_user
+    DEST_CRED_PASSWORD:
+      from_secret: container_image_registry_password
+  image: quay.io/skopeo/stable:v1.13.0
+
+- name: email-notification
+  environment:
+    SMTP_FROM_ADDRESS:
+      from_secret: smtp_from_address
+    SMTP_FROM_NAME:
+      from_secret: smtp_from_name
+    SMTP_HOST:
+      from_secret: smtp_host
+    SMTP_USERNAME:
+      from_secret: smtp_username
+    SMTP_PASSWORD:
+      from_secret: smtp_password
+  image: git.cryptic.systems/volker.raschek/drone-email:0.1.2
+  resources:
+    limits:
+      cpu: 150
+      memory: 150M
+  when:
+    status:
+    - changed
+    - failure
+
+trigger:
+  branch:
+  - master
+  event:
+  - cron
+  - push
+  repo:
+  - volker.raschek/dcmerge
+
+---
+kind: pipeline
+type: docker
+name: tagged-amd64
+
+clone:
+  disable: true
+
+platform:
+  os: linux
+  arch: amd64
+
+steps:
+- name: clone
+  image: git.cryptic.systems/volker.raschek/git:1.2.1
+
+- name: build
+  image: docker.io/plugins/docker:20.10.9
+  settings:
+    auto_tag: true
+    auto_tag_suffix: amd64
+    dockerfile: Dockerfile
+    force_tag: true
+    no_cache: true
+    purge: true
+    mirror:
+      from_secret: docker_io_mirror
+    registry: git.cryptic.systems
+    repo: git.cryptic.systems/volker.raschek/dcmerge
+    username:
+      from_secret: git_cryptic_systems_container_registry_user
+    password:
+      from_secret: git_cryptic_systems_container_registry_password
+    build_args:
+    - VERSION=${DRONE_TAG}
+
+- name: email-notification
+  environment:
+    SMTP_FROM_ADDRESS:
+      from_secret: smtp_from_address
+    SMTP_FROM_NAME:
+      from_secret: smtp_from_name
+    SMTP_HOST:
+      from_secret: smtp_host
+    SMTP_USERNAME:
+      from_secret: smtp_username
+    SMTP_PASSWORD:
+      from_secret: smtp_password
+  image: git.cryptic.systems/volker.raschek/drone-email:0.1.2
+  when:
+    status:
+    - changed
+    - failure
+
+trigger:
+  event:
+  - tag
+  repo:
+  - volker.raschek/dcmerge
+
+---
+kind: pipeline
+type: docker
+name: tagged-arm-v7
+
+clone:
+  disable: true
+
+platform:
+  os: linux
+  arch: arm
+
+steps:
+- name: clone
+  image: git.cryptic.systems/volker.raschek/git:1.2.1
+
+- name: build
+  image: docker.io/plugins/docker:20.10.9
+  settings:
+    auto_tag: true
+    auto_tag_suffix: arm-v7
+    dockerfile: Dockerfile
+    force_tag: true
+    no_cache: true
+    purge: true
+    mirror:
+      from_secret: docker_io_mirror
+    registry: git.cryptic.systems
+    repo: git.cryptic.systems/volker.raschek/dcmerge
+    username:
+      from_secret: git_cryptic_systems_container_registry_user
+    password:
+      from_secret: git_cryptic_systems_container_registry_password
+    build_args:
+    - VERSION=${DRONE_TAG}
+
+- name: email-notification
+  environment:
+    SMTP_FROM_ADDRESS:
+      from_secret: smtp_from_address
+    SMTP_FROM_NAME:
+      from_secret: smtp_from_name
+    SMTP_HOST:
+      from_secret: smtp_host
+    SMTP_USERNAME:
+      from_secret: smtp_username
+    SMTP_PASSWORD:
+      from_secret: smtp_password
+  image: git.cryptic.systems/volker.raschek/drone-email:0.1.2
+  when:
+    status:
+    - changed
+    - failure
+
+trigger:
+  event:
+  - tag
+  repo:
+  - volker.raschek/dcmerge
+
+---
+kind: pipeline
+type: docker
+name: tagged-arm64-v8
+
+clone:
+  disable: true
+
+platform:
+  os: linux
+  arch: arm64
+
+steps:
+- name: clone
+  image: git.cryptic.systems/volker.raschek/git:1.2.1
+
+- name: build
+  image: docker.io/plugins/docker:20.10.9
+  settings:
+    auto_tag: true
+    auto_tag_suffix: arm64-v8
+    dockerfile: Dockerfile
+    force_tag: true
+    no_cache: true
+    purge: true
+    mirror:
+      from_secret: docker_io_mirror
+    registry: git.cryptic.systems
+    repo: git.cryptic.systems/volker.raschek/dcmerge
+    username:
+      from_secret: git_cryptic_systems_container_registry_user
+    password:
+      from_secret: git_cryptic_systems_container_registry_password
+    build_args:
+    - VERSION=${DRONE_TAG}
+
+- name: email-notification
+  environment:
+    SMTP_FROM_ADDRESS:
+      from_secret: smtp_from_address
+    SMTP_FROM_NAME:
+      from_secret: smtp_from_name
+    SMTP_HOST:
+      from_secret: smtp_host
+    SMTP_USERNAME:
+      from_secret: smtp_username
+    SMTP_PASSWORD:
+      from_secret: smtp_password
+  image: git.cryptic.systems/volker.raschek/drone-email:0.1.2
+  when:
+    status:
+    - changed
+    - failure
+
+trigger:
+  event:
+  - tag
+  repo:
+  - volker.raschek/dcmerge
+
+---
+kind: pipeline
+type: kubernetes
+name: tagged-manifest
+
+clone:
+  disable: true
+
+depends_on:
+- tagged-amd64
+- tagged-arm-v7
+- tagged-arm64-v8
+
+# docker.io/plugins/manifest only for amd64 architectures available
+node_selector:
+  kubernetes.io/os: linux
+  kubernetes.io/arch: amd64
+
+steps:
+- name: clone
+  image: git.cryptic.systems/volker.raschek/git:1.2.1
+
+- name: build-manifest
+  image: docker.io/plugins/manifest:1.4.0
+  settings:
+    auto_tag: true
+    ignore_missing: true
+    spec: manifest.tmpl
+    username:
+      from_secret: git_cryptic_systems_container_registry_user
+    password:
+      from_secret: git_cryptic_systems_container_registry_password
+
+- name: email-notification
+  environment:
+    SMTP_FROM_ADDRESS:
+      from_secret: smtp_from_address
+    SMTP_FROM_NAME:
+      from_secret: smtp_from_name
+    SMTP_HOST:
+      from_secret: smtp_host
+    SMTP_USERNAME:
+      from_secret: smtp_username
+    SMTP_PASSWORD:
+      from_secret: smtp_password
+  image: git.cryptic.systems/volker.raschek/drone-email:0.1.2
+  resources:
+    limits:
+      cpu: 150
+      memory: 150M
+  when:
+    status:
+    - changed
+    - failure
+
+trigger:
+  event:
+  - tag
+  repo:
+  - volker.raschek/dcmerge
+
+---
+kind: pipeline
+type: kubernetes
+name: tagged-sync
+
+clone:
+  disable: true
+
+depends_on:
+- tagged-manifest
+
+steps:
+- name: clone
+  image: git.cryptic.systems/volker.raschek/git:1.2.1
+
+- name: tagged-sync
+  commands:
+  - skopeo sync --all --src=docker --src-creds=$SRC_CRED_USERNAME:$SRC_CRED_PASSWORD --dest=docker --dest-creds=$DEST_CRED_USERNAME:$DEST_CRED_PASSWORD git.cryptic.systems/volker.raschek/dcmerge docker.io/volkerraschek
+  environment:
+    SRC_CRED_USERNAME:
+      from_secret: git_cryptic_systems_container_registry_user
+    SRC_CRED_PASSWORD:
+      from_secret: git_cryptic_systems_container_registry_password
+    DEST_CRED_USERNAME:
+      from_secret: container_image_registry_user
+    DEST_CRED_PASSWORD:
+      from_secret: container_image_registry_password
+  image: quay.io/skopeo/stable:v1.13.0
+
+- name: email-notification
+  environment:
+    SMTP_FROM_ADDRESS:
+      from_secret: smtp_from_address
+    SMTP_FROM_NAME:
+      from_secret: smtp_from_name
+    SMTP_HOST:
+      from_secret: smtp_host
+    SMTP_USERNAME:
+      from_secret: smtp_username
+    SMTP_PASSWORD:
+      from_secret: smtp_password
+  image: git.cryptic.systems/volker.raschek/drone-email:0.1.2
+  resources:
+    limits:
+      cpu: 150
+      memory: 150M
+  when:
+    status:
+    - changed
+    - failure
+
+trigger:
+  event:
+  - tag
+  repo:
+  - volker.raschek/dcmerge

.gitignore

@@ -0,0 +1 @@
+dcmerge

.markdownlint.yaml

@@ -0,0 +1,143 @@
+# markdownlint YAML configuration
+# https://github.com/DavidAnson/markdownlint/blob/main/schema/.markdownlint.yaml
+
+# Default state for all rules
+default: true
+
+# Path to configuration file to extend
+extends: null
+
+# MD003/heading-style/header-style - Heading style
+MD003:
+  # Heading style
+  style: "atx"
+
+# MD004/ul-style - Unordered list style
+MD004:
+  style: "dash"
+
+# MD007/ul-indent - Unordered list indentation
+MD007:
+  # Spaces for indent
+  indent: 2
+  # Whether to indent the first level of the list
+  start_indented: false
+
+# MD009/no-trailing-spaces - Trailing spaces
+MD009:
+  # Spaces for line break
+  br_spaces: 2
+  # Allow spaces for empty lines in list items
+  list_item_empty_lines: false
+  # Include unnecessary breaks
+  strict: false
+
+# MD010/no-hard-tabs - Hard tabs
+MD010:
+  # Include code blocks
+  code_blocks: true
+
+# MD012/no-multiple-blanks - Multiple consecutive blank lines
+MD012:
+  # Consecutive blank lines
+  maximum: 1
+
+# MD013/line-length - Line length
+MD013:
+  # Number of characters
+  line_length: 80
+  # Number of characters for headings
+  heading_line_length: 80
+  # Number of characters for code blocks
+  code_block_line_length: 80
+  # Include code blocks
+  code_blocks: false
+  # Include tables
+  tables: false
+  # Include headings
+  headings: true
+  # Include headings
+  headers: true
+  # Strict length checking
+  strict: false
+  # Stern length checking
+  stern: false
+
+# MD022/blanks-around-headings/blanks-around-headers - Headings should be surrounded by blank lines
+MD022:
+  # Blank lines above heading
+  lines_above: 1
+  # Blank lines below heading
+  lines_below: 1
+
+# MD024/no-duplicate-heading/no-duplicate-header - Multiple headings with the same content
+MD024:
+  # Only check sibling headings
+  allow_different_nesting: true
+
+# MD025/single-title/single-h1 - Multiple top-level headings in the same document
+MD025:
+  # Heading level
+  level: 1
+  # RegExp for matching title in front matter
+  front_matter_title: "^\\s*title\\s*[:=]"
+
+# MD026/no-trailing-punctuation - Trailing punctuation in heading
+MD026:
+  # Punctuation characters
+  punctuation: ".,;:!。，；：！"
+
+# MD029/ol-prefix - Ordered list item prefix
+MD029:
+  # List style
+  style: "one_or_ordered"
+
+# MD030/list-marker-space - Spaces after list markers
+MD030:
+  # Spaces for single-line unordered list items
+  ul_single: 1
+  # Spaces for single-line ordered list items
+  ol_single: 1
+  # Spaces for multi-line unordered list items
+  ul_multi: 1
+  # Spaces for multi-line ordered list items
+  ol_multi: 1
+
+# MD033/no-inline-html - Inline HTML
+MD033:
+  # Allowed elements
+  allowed_elements: []
+
+# MD035/hr-style - Horizontal rule style
+MD035:
+  # Horizontal rule style
+  style: "---"
+
+# MD036/no-emphasis-as-heading/no-emphasis-as-header - Emphasis used instead of a heading
+MD036:
+  # Punctuation characters
+  punctuation: ".,;:!?。，；：！？"
+
+# MD041/first-line-heading/first-line-h1 - First line in a file should be a top-level heading
+MD041:
+  # Heading level
+  level: 1
+  # RegExp for matching title in front matter
+  front_matter_title: "^\\s*title\\s*[:=]"
+
+# MD044/proper-names - Proper names should have the correct capitalization
+MD044:
+  # List of proper names
+  names: []
+  # Include code blocks
+  code_blocks: false
+
+# MD046/code-block-style - Code block style
+MD046:
+  # Block style
+  style: "fenced"
+
+# MD048/code-fence-style - Code fence style
+MD048:
+  # Code fence syle
+  style: "backtick"

Dockerfile

@@ -0,0 +1,20 @@
+FROM docker.io/library/golang:1.20.6-alpine3.18 AS build
+
+RUN apk add git make
+
+WORKDIR /workspace
+ADD ./ /workspace
+
+RUN make install \
+      DESTDIR=/cache \
+      PREFIX=/usr \
+      VERSION=${VERSION}
+
+FROM docker.io/library/alpine:3.18.2
+
+COPY --from=build /cache /
+
+WORKDIR /workspace
+VOLUME [ "/workspace" ]
+
+ENTRYPOINT [ "/usr/bin/dcmerge" ]

LICENSE

@@ -0,0 +1,20 @@
+Copyright (c) 2023 Markus Pesch
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Makefile

@@ -0,0 +1,114 @@
+EXECUTABLE=dcmerge
+VERSION?=$(shell git describe --abbrev=0)+hash.$(shell git rev-parse --short HEAD)
+
+# Destination directory and prefix to place the compiled binaries, documentaions
+# and other files.
+DESTDIR?=
+PREFIX?=/usr/local
+
+# CONTAINER_RUNTIME
+# The CONTAINER_RUNTIME variable will be used to specified the path to a
+# container runtime. This is needed to start and run a container image.
+CONTAINER_RUNTIME?=$(shell which podman)
+
+# DCMERGE_IMAGE_REGISTRY_NAME
+# Defines the name of the new container to be built using several variables.
+DCMERGE_IMAGE_REGISTRY_NAME:=git.cryptic.systems
+DCMERGE_IMAGE_REGISTRY_USER:=volker.raschek
+
+DCMERGE_IMAGE_NAMESPACE?=${DCMERGE_IMAGE_REGISTRY_USER}
+DCMERGE_IMAGE_NAME:=${EXECUTABLE}
+DCMERGE_IMAGE_VERSION?=latest
+DCMERGE_IMAGE_FULLY_QUALIFIED=${DCMERGE_IMAGE_REGISTRY_NAME}/${DCMERGE_IMAGE_NAMESPACE}/${DCMERGE_IMAGE_NAME}:${DCMERGE_IMAGE_VERSION}
+DCMERGE_IMAGE_UNQUALIFIED=${DCMERGE_IMAGE_NAMESPACE}/${DCMERGE_IMAGE_NAME}:${DCMERGE_IMAGE_VERSION}
+
+# BIN
+# ==============================================================================
+dcmerge:
+	CGO_ENABLED=0 \
+	GOPRIVATE=$(shell go env GOPRIVATE) \
+	GOPROXY=$(shell go env GOPROXY) \
+	GONOPROXY=$(shell go env GONOPROXY) \
+	GONOSUMDB=$(shell go env GONOSUMDB) \
+	GOSUMDB=$(shell go env GOSUMDB) \
+		go build -ldflags "-X 'main.version=${VERSION}'" -o ${@} main.go
+
+# CLEAN
+# ==============================================================================
+PHONY+=clean
+clean:
+	rm --force --recursive dcmerge
+
+# TESTS
+# ==============================================================================
+PHONY+=test/unit
+test/unit:
+	go test -v -p 1 -coverprofile=coverage.txt -covermode=count -timeout 1200s ./pkg/...
+
+PHONY+=test/integration
+test/integration:
+	go test -v -p 1 -count=1 -timeout 1200s ./it/...
+
+PHONY+=test/coverage
+test/coverage: test/unit
+	go tool cover -html=coverage.txt
+
+# GOLANGCI-LINT
+# ==============================================================================
+PHONY+=golangci-lint
+golangci-lint:
+	golangci-lint run --concurrency=$(shell nproc)
+
+# INSTALL
+# ==============================================================================
+PHONY+=uninstall
+install: dcmerge
+	install --directory ${DESTDIR}/etc/bash_completion.d
+	./dcmerge completion bash > ${DESTDIR}/etc/bash_completion.d/${EXECUTABLE}
+
+	install --directory ${DESTDIR}${PREFIX}/bin
+	install --mode 0755 ${EXECUTABLE} ${DESTDIR}${PREFIX}/bin/${EXECUTABLE}
+
+	install --directory ${DESTDIR}${PREFIX}/share/licenses/${EXECUTABLE}
+	install --mode 0644 LICENSE ${DESTDIR}${PREFIX}/share/licenses/${EXECUTABLE}/LICENSE
+
+# UNINSTALL
+# ==============================================================================
+PHONY+=uninstall
+uninstall:
+	-rm --force --recursive \
+		${DESTDIR}/etc/bash_completion.d/${EXECUTABLE} \
+		${DESTDIR}${PREFIX}/bin/${EXECUTABLE} \
+		${DESTDIR}${PREFIX}/share/licenses/${EXECUTABLE}
+
+# BUILD CONTAINER IMAGE
+# ==============================================================================
+PHONY+=container-image/build
+container-image/build:
+	${CONTAINER_RUNTIME} build \
+		--build-arg VERSION=${VERSION} \
+		--file Dockerfile \
+		--no-cache \
+		--pull \
+		--tag ${DCMERGE_IMAGE_FULLY_QUALIFIED} \
+		--tag ${DCMERGE_IMAGE_UNQUALIFIED} \
+		.
+
+# DELETE CONTAINER IMAGE
+# ==============================================================================
+PHONY:=container-image/delete
+container-image/delete:
+	- ${CONTAINER_RUNTIME} image rm ${DCMERGE_IMAGE_FULLY_QUALIFIED} ${DCMERGE_IMAGE_UNQUALIFIED}
+
+# PUSH CONTAINER IMAGE
+# ==============================================================================
+PHONY+=container-image/push
+container-image/push:
+	echo ${DCMERGE_IMAGE_REGISTRY_PASSWORD} | ${CONTAINER_RUNTIME} login ${DCMERGE_IMAGE_REGISTRY_NAME} --username ${DCMERGE_IMAGE_REGISTRY_USER} --password-stdin
+	${CONTAINER_RUNTIME} push ${DCMERGE_IMAGE_FULLY_QUALIFIED}
+
+# PHONY
+# ==============================================================================
+# Declare the contents of the PHONY variable as phony.  We keep that information
+# in a variable so we can use it in if_changed.
+.PHONY: ${PHONY}

README.md

@@ -0,0 +1,129 @@
+# dcmerge
+
+[![Build Status](https://drone.cryptic.systems/api/badges/volker.raschek/dcmerge/status.svg)](https://drone.cryptic.systems/volker.raschek/dcmerge)
+[![Docker Pulls](https://img.shields.io/docker/pulls/volkerraschek/dcmerge)](https://hub.docker.com/r/volkerraschek/dcmerge)
+
+`dcmerge` is a small program to merge docker-compose files from multiple
+sources. It is available via RPM and docker.
+
+The dynamic pattern of a docker-compose file, that for example `environments`
+can be specified as a string slice or a list of objects is currently not
+supported. `dcmerge` expect a strict pattern layout. The `environments`, `ports`
+and `volumes` must be declared as a slice of strings.
+
+Dockercompose file can be read-in from different sources. Currently are the
+following sources supported:
+
+- File
+- HTTP/HTTPS
+
+Furthermore, `dcmerge` support different ways to merge multiple docker-compose
+files.
+
+- The default merge, add missing secrets, services, networks and volumes.
+- The existing-win merge, add and protect existing attributes.
+- The last-win merge, add or overwrite existing attributes.
+
+## default
+
+Merge only missing secrets, services, networks and volumes without respecting
+their attributes. For example, when the service `app` is already declared, it is
+not possible to add the service `app` twice. The second service will be
+completely skipped.
+
+```yaml
+---
+# cat ~/docker-compose-A.yaml
+services:
+  app:
+    environments:
+    - CLIENT_SECRET=HelloWorld123
+    image: example.local/app/name:0.1.0
+---
+# cat ~/docker-compose-B.yaml
+services:
+  app:
+    image: app/name:2.3.0
+    volume:
+    - /etc/localtime:/etc/localtime
+    - /dev/urandom:/etc/urandom
+  db:
+    image: postgres
+    volume:
+    - /etc/localtime:/etc/localtime
+    - /dev/urandom:/etc/urandom
+---
+# dcmerge ~/docker-compose-A.yaml ~/docker-compose-B.yaml
+services:
+  app:
+    environments:
+    - CLIENT_SECRET=HelloWorld123
+    image: example.local/app/name:0.1.0
+  db:
+    image: postgres
+    volume:
+    - /etc/localtime:/etc/localtime
+    - /dev/urandom:/etc/urandom
+```
+
+## existing-win
+
+The existing-win merge protects existing attributes. For example there are two
+different docker-compose files, but booth has the same environment variable
+`CLIENT_SECRET` defined with different values. The first declaration of the
+attribute wins and is for overwriting protected.
+
+```yaml
+---
+# cat ~/docker-compose-A.yaml
+services:
+  app:
+    environments:
+    - CLIENT_SECRET=HelloWorld123
+    image: example.local/app/name:0.1.0
+---
+# cat ~/docker-compose-B.yaml
+services:
+  app:
+    environments:
+    - CLIENT_SECRET=FooBar123
+    image: example.local/app/name:0.1.0
+---
+# dcmerge --existing-win ~/docker-compose-A.yaml ~/docker-compose-B.yaml
+services:
+  app:
+    environments:
+    - CLIENT_SECRET=HelloWorld123
+    image: example.local/app/name:0.1.0
+```
+
+## last-win
+
+The last-win merge overwrite recursive existing attributes. For example there
+are two different docker-compose files, but booth has the same environment
+variable `CLIENT_SECRET` defined with different values. The last passed
+docker-compose file which contains this environment wins.
+
+```yaml
+---
+# cat ~/docker-compose-A.yaml
+services:
+  app:
+    environments:
+    - CLIENT_SECRET=HelloWorld123
+    image: example.local/app/name:0.1.0
+---
+# cat ~/docker-compose-B.yaml
+services:
+  app:
+    environments:
+    - CLIENT_SECRET=FooBar123
+    image: example.local/app/name:0.1.0
+---
+# dcmerge --last-win ~/docker-compose-A.yaml ~/docker-compose-B.yaml
+services:
+  app:
+    environments:
+    - CLIENT_SECRET=FooBar123
+    image: example.local/app/name:0.1.0
+```

cmd/root.go

@@ -0,0 +1,101 @@
+package cmd
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+
+	"git.cryptic.systems/volker.raschek/dcmerge/pkg/domain/dockerCompose"
+	"git.cryptic.systems/volker.raschek/dcmerge/pkg/fetcher"
+	"github.com/spf13/cobra"
+	"gopkg.in/yaml.v2"
+)
+
+func Execute(version string) error {
+	completionCmd := &cobra.Command{
+		Use:                   "completion [bash|zsh|fish|powershell]",
+		Short:                 "Generate completion script",
+		Long:                  "To load completions",
+		DisableFlagsInUseLine: true,
+		ValidArgs:             []string{"bash", "zsh", "fish", "powershell"},
+		Args:                  cobra.ExactValidArgs(1),
+		Run: func(cmd *cobra.Command, args []string) {
+			switch args[0] {
+			case "bash":
+				cmd.Root().GenBashCompletion(os.Stdout)
+			case "zsh":
+				cmd.Root().GenZshCompletion(os.Stdout)
+			case "fish":
+				cmd.Root().GenFishCompletion(os.Stdout, true)
+			case "powershell":
+				cmd.Root().GenPowerShellCompletionWithDesc(os.Stdout)
+			}
+		},
+	}
+
+	rootCmd := &cobra.Command{
+		Use:   "dcmerge",
+		Args:  cobra.MinimumNArgs(2),
+		Short: "Merge docker-compose files from multiple resources",
+		Example: `dcmerge docker-compose.yml ./integration-test/docker-compose.yml
+dcmerge docker-compose.yml https://git.example.local/user/repo/docker-compose.yml`,
+		RunE:    run,
+		Version: version,
+	}
+	rootCmd.Flags().BoolP("last-merge", "l", false, "Overwrite existing attributes")
+	rootCmd.Flags().BoolP("output-file", "o", false, "Write instead on stdout into a file")
+	rootCmd.AddCommand(completionCmd)
+
+	return rootCmd.Execute()
+}
+
+func run(cmd *cobra.Command, args []string) error {
+	mergeLastWin, err := cmd.Flags().GetBool("last-merge")
+	if err != nil {
+		return fmt.Errorf("Failed to parse flag last-merge: %s", err)
+	}
+
+	outputFile, err := cmd.Flags().GetString("output-file")
+	if err != nil {
+		return fmt.Errorf("Failed to parse flag output-file: %s", err)
+	}
+
+	dockerComposeConfig := dockerCompose.NewConfig()
+
+	dockerComposeConfigs, err := fetcher.Fetch(args...)
+	if err != nil {
+		return err
+	}
+
+	for _, config := range dockerComposeConfigs {
+		switch {
+		case mergeLastWin:
+			dockerComposeConfig.MergeLastWin(config)
+		default:
+			dockerComposeConfig.Merge(config)
+		}
+
+	}
+
+	switch {
+	case len(outputFile) > 0:
+		err = os.MkdirAll(filepath.Dir(outputFile), 0755)
+		if err != nil {
+			return err
+		}
+
+		f, err := os.Create(outputFile)
+		if err != nil {
+			return err
+		}
+		defer f.Close()
+
+		yamlEncoder := yaml.NewEncoder(f)
+		return yamlEncoder.Encode(dockerComposeConfig)
+
+	default:
+		yamlEncoder := yaml.NewEncoder(os.Stdout)
+		return yamlEncoder.Encode(dockerComposeConfig)
+	}
+
+}

go.mod

@@ -0,0 +1,17 @@
+module git.cryptic.systems/volker.raschek/dcmerge
+
+go 1.20
+
+require (
+	github.com/spf13/cobra v1.7.0
+	github.com/stretchr/testify v1.8.4
+	gopkg.in/yaml.v2 v2.4.0
+	gopkg.in/yaml.v3 v3.0.1
+)
+
+require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/inconshreveable/mousetrap v1.1.0 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/spf13/pflag v1.0.5 // indirect
+)

go.sum

@@ -0,0 +1,20 @@
+github.com/cpuguy83/go-md2man/v2 v2.0.2/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/inconshreveable/mousetrap v1.1.0 h1:wN+x4NVGpMsO7ErUn/mUI3vEoE6Jt13X2s0bqwp9tc8=
+github.com/inconshreveable/mousetrap v1.1.0/go.mod h1:vpF70FUmC8bwa3OWnCshd2FqLfsEA9PFc4w1p2J65bw=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
+github.com/spf13/cobra v1.7.0 h1:hyqWnYt1ZQShIddO5kBpj3vu05/++x6tJ6dg8EC572I=
+github.com/spf13/cobra v1.7.0/go.mod h1:uLxZILRyS/50WlhOIKD7W6V5bgeIt+4sICxh6uRMrb0=
+github.com/spf13/pflag v1.0.5 h1:iy+VFUOCP1a+8yFto/drg2CJ5u0yRoB7fZw3DKv/JXA=
+github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
+github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk=
+github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
+gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

main.go

@@ -0,0 +1,9 @@
+package main
+
+import "git.cryptic.systems/volker.raschek/dcmerge/cmd"
+
+var version string
+
+func main() {
+	cmd.Execute(version)
+}

manifest.tmpl

@@ -0,0 +1,26 @@
+image: git.cryptic.systems/volker.raschek/dcmerge:{{#if build.tag}}{{trimPrefix "v" build.tag}}{{else}}latest{{/if}}
+{{#if build.tags}}
+tags:
+{{#each build.tags}}
+  - {{this}}
+{{/each}}
+  - "latest"
+{{/if}}
+manifests:
+  -
+    image: git.cryptic.systems/volker.raschek/dcmerge:{{#if build.tag}}{{trimPrefix "v" build.tag}}{{else}}latest{{/if}}-amd64
+    platform:
+      architecture: amd64
+      os: linux
+  -
+    image: git.cryptic.systems/volker.raschek/dcmerge:{{#if build.tag}}{{trimPrefix "v" build.tag}}{{else}}latest{{/if}}-arm-v7
+    platform:
+      architecture: arm
+      os: linux
+      variant: v7
+  -
+    image: git.cryptic.systems/volker.raschek/dcmerge:{{#if build.tag}}{{trimPrefix "v" build.tag}}{{else}}latest{{/if}}-arm64-v8
+    platform:
+      architecture: arm64
+      os: linux
+      variant: v8

pkg/domain/dockerCompose/equalable.go

@@ -0,0 +1,65 @@
+package dockerCompose
+
+type Equalable interface {
+	Equal(equalable Equalable) bool
+}
+
+// Contains returns true when sliceA is in sliceB.
+func Contains[R Equalable](sliceA, sliceB []R) bool {
+	switch {
+	case sliceA == nil && sliceB == nil:
+		return true
+	case sliceA != nil && sliceB == nil:
+		return false
+	case sliceA == nil && sliceB != nil:
+		return false
+	default:
+	LOOP:
+		for i := range sliceA {
+			for j := range sliceB {
+				if sliceA[i].Equal(sliceB[j]) {
+					continue LOOP
+				}
+			}
+			return false
+		}
+		return true
+	}
+}
+
+// Equal returns true when sliceA and sliceB are equal.
+func Equal[R Equalable](sliceA, sliceB []R) bool {
+	return Contains(sliceA, sliceB) &&
+		Contains(sliceB, sliceA) &&
+		len(sliceA) == len(sliceB)
+}
+
+// Equal returns true when booth string maps of Equalable are equal.
+func EqualStringMap[R Equalable](mapA, mapB map[string]R) bool {
+	equalFunc := func(mapA, mapB map[string]R) bool {
+	LOOP:
+		for keyA, valueA := range mapA {
+			for keyB, valueB := range mapB {
+				if keyA == keyB &&
+					valueA.Equal(valueB) {
+					continue LOOP
+				}
+			}
+			return false
+		}
+		return true
+	}
+
+	return equalFunc(mapA, mapB) && equalFunc(mapB, mapA)
+}
+
+// ExistsInMap returns true if object of type any exists under the passed name.
+func ExistsInMap[T any](m map[string]T, name string) bool {
+	switch {
+	case m == nil:
+		return false
+	default:
+		_, present := m[name]
+		return present
+	}
+}

pkg/fetcher/fetcher.go

@@ -0,0 +1,99 @@
+package fetcher
+
+import (
+	"errors"
+	"fmt"
+	"net/http"
+	"net/url"
+	"os"
+
+	"git.cryptic.systems/volker.raschek/dcmerge/pkg/domain/dockerCompose"
+	"gopkg.in/yaml.v3"
+)
+
+func Fetch(urls ...string) ([]*dockerCompose.Config, error) {
+	dockerComposeConfigs := make([]*dockerCompose.Config, 0)
+
+	for _, rawURL := range urls {
+		dockerComposeURL, err := url.Parse(rawURL)
+		if err != nil {
+			return nil, err
+		}
+
+		switch {
+		case dockerComposeURL.Scheme == "http" || dockerComposeURL.Scheme == "https":
+			dockerComposeConfig, err := getDockerComposeViaHTTP(dockerComposeURL.String())
+			if err != nil {
+				return nil, err
+			}
+
+			dockerComposeConfigs = append(dockerComposeConfigs, dockerComposeConfig)
+		case dockerComposeURL.Scheme == "file":
+			fallthrough
+		default:
+			dockerComposeConfig, err := readDockerComposeFromFile(dockerComposeURL.Path)
+			if err != nil {
+				return nil, err
+			}
+
+			dockerComposeConfigs = append(dockerComposeConfigs, dockerComposeConfig)
+		}
+	}
+
+	return dockerComposeConfigs, nil
+}
+
+var ErrorPathIsDir error = errors.New("Path is a directory")
+
+func getDockerComposeViaHTTP(url string) (*dockerCompose.Config, error) {
+	req, err := http.NewRequest(http.MethodGet, url, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("Received unexpected HTTP-Statuscode %v", resp.StatusCode)
+	}
+
+	dockerCompose := dockerCompose.NewConfig()
+
+	yamlDecoder := yaml.NewDecoder(resp.Body)
+	err = yamlDecoder.Decode(&dockerCompose)
+	if err != nil {
+		return nil, err
+	}
+
+	return dockerCompose, nil
+}
+
+func readDockerComposeFromFile(name string) (*dockerCompose.Config, error) {
+	fileStat, err := os.Stat(name)
+	switch {
+	case errors.Is(err, os.ErrNotExist):
+		return nil, err
+	case fileStat.IsDir():
+		return nil, fmt.Errorf("%w: %s", ErrorPathIsDir, name)
+	}
+
+	file, err := os.Open(name)
+	if err != nil {
+		return nil, err
+	}
+	defer file.Close()
+
+	dockerCompose := dockerCompose.NewConfig()
+
+	yamlDecoder := yaml.NewDecoder(file)
+	err = yamlDecoder.Decode(&dockerCompose)
+	if err != nil {
+		return nil, err
+	}
+
+	return dockerCompose, nil
+}

renovate.json

@@ -0,0 +1,31 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "assignees": [ "volker.raschek" ],
+  "automergeStrategy": "merge-commit",
+  "automergeType": "pr",
+  "labels": [ "renovate" ],
+  "packageRules": [
+    {
+      "addLabels": [ "renovate/droneci", "renovate/automerge" ],
+      "automerge": true,
+      "matchManagers": "droneci",
+      "matchUpdateTypes": [ "minor", "patch"]
+    },
+    {
+      "description": "Automatically update patch version of used container images in docker files",
+      "addLabels": [ "renovate/container-image", "renovate/automerge" ],
+      "automerge": true,
+      "matchBaseBranches": [ "master" ],
+      "matchManagers": [ "dockerfile" ],
+      "matchUpdateTypes": [ "patch" ]
+    },
+    {
+      "addLabels": [ "renovate/dcmerge", "renovate/automerge" ],
+      "automerge": false,
+      "matchPackageNames": [ "dcmerge" ],
+      "matchManagers": [ "regex" ]
+    }
+  ],
+  "rebaseLabel": "renovate/rebase",
+  "rebaseWhen": "behind-base-branch"
+}