initial commit

.drone.yml

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+---
+kind: pipeline
+name: test
+
+platform:
+  os: linux
+  arch: amd64
+
+steps:
+  - name: markdownlint
+    image: thegeeklab/markdownlint-cli
+    commands:
+      - markdownlint 'README.md'
+
+trigger:
+  ref:
+    - refs/heads/main
+    - refs/pull/**
+    - refs/tags/**
+
+---
+kind: pipeline
+name: build-container
+
+platform:
+  os: linux
+  arch: amd64
+
+steps:
+  - name: package
+    image: thegeeklab/alpine-tools
+    commands:
+      - mkdir dist/
+      - tar -C ./overlay -zcvf dist/container-library.tar.gz -X .
+
+  - name: checksum
+    image: thegeeklab/alpine-tools
+    commands:
+      - cd dist/ && sha256sum * > ../sha256sum.txt
+
+  - name: changelog-generate
+    image: thegeeklab/git-chglog
+    commands:
+      - git fetch -tq
+      - git-chglog --no-color --no-emoji -o CHANGELOG.md ${DRONE_TAG:---next-tag unreleased unreleased}
+    depends_on:
+      - tags
+
+  - name: changelog-format
+    image: thegeeklab/alpine-tools
+    commands:
+      - prettier CHANGELOG.md
+      - prettier -w CHANGELOG.md
+    depends_on:
+      - changelog-generate
+
+  - name: publish-gitea
+    image: plugins/gitea-release
+    settings:
+      api_key:
+        from_secret: gitea_token
+      base_url: https://gitea.rknet.org
+      files:
+        - dist/*
+        - sha256sum.txt
+      note: CHANGELOG.md
+      overwrite: true
+      title: ${DRONE_TAG}
+    when:
+      ref:
+        - refs/tags/**
+    depends_on:
+      - publish-dockerhub
+      - publish-quay
+
+trigger:
+  ref:
+    - refs/heads/main
+    - refs/pull/**
+    - refs/tags/**
+
+depends_on:
+  - test
+
+---
+kind: pipeline
+name: notifications
+
+platform:
+  os: linux
+  arch: amd64
+
+steps:
+  - name: matrix
+    image: thegeeklab/drone-matrix
+    settings:
+      homeserver:
+        from_secret: matrix_homeserver
+      password:
+        from_secret: matrix_password
+      roomid:
+        from_secret: matrix_roomid
+      template: "Status: **{{ build.Status }}**<br/> Build: [{{ repo.Owner }}/{{ repo.Name }}]({{ build.Link }}){{#if build.Branch}} ({{ build.Branch }}){{/if}} by {{ commit.Author }}<br/> Message: {{ commit.Message.Title }}"
+      username:
+        from_secret: matrix_username
+    when:
+      status:
+        - success
+        - failure
+
+trigger:
+  ref:
+    - refs/heads/main
+    - refs/tags/**
+  status:
+    - success
+    - failure
+
+depends_on:
+  - build-container
+
+---
+kind: signature
+hmac: 3d3a49cd900fe822c6568d4f2f2e6e9d628ddf2aca147079658b117c8de92c45
+
+...

.gitignore

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+CHANGELOG.md
+dist/

.markdownlint.yml

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+---
+default: True
+MD013: False
+MD041: False
+MD004:
+  style: dash

.prettierignore

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+.drone.yml
+*.tpl.md

LICENSE

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+MIT License
+
+Copyright (c) 2021 Robert Kaussow <mail@thegeeklab.de>
+
+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 (including the next
+paragraph) 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.

README.md

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+# container-library
+
+[![Build Status](https://img.shields.io/drone/build/docker/container-library?logo=drone&server=https%3A%2F%2Fdrone.rknet.org)](https://drone.rknet.org/docker/container-library)
+[![License: MIT](https://img.shields.io/badge/license-MIT-blue.svg)](https://gitea.rknet.org/docker/container-library/src/branch/main/LICENSE)
+
+Basic utilities script library to use in container images.
+
+## License
+
+This project is licensed under the MIT License - see the [LICENSE](https://gitea.rknet.org/docker/container-library/src/branch/main/LICENSE) file for details.

overlay/usr/local/lib/log.sh

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+#!/usr/bin/env sh
+
+# Library for logging functions
+
+# Log the given message at the given level. All logs are written to stderr with a timestamp.
+log() {
+    level="$1"
+    message="$2"
+    timestamp=$(date +"%Y-%m-%d %H:%M:%S")
+    script_name="$(basename "$0")"
+    printf >&2 "%s [%s] [%s] %s" "${timestamp}" "${level}" "$script_name" "${message}"
+}
+
+# Log the given message at INFO level. All logs are written to stderr with a timestamp.
+log_info() {
+    message="$1"
+    log "INFO" "$message"
+}
+
+# Log the given message at WARN level. All logs are written to stderr with a timestamp.
+log_warn() {
+    message="$1"
+    log "WARN" "$message"
+}
+
+# Log the given message at ERROR level. All logs are written to stderr with a timestamp.
+log_error() {
+    message="$1"
+    log "ERROR" "$message"
+}