import opendkim code

.drone.yml

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+---
+kind: pipeline
+name: default
+
+steps:
+  - name: build image only
+    image: plugins/docker
+    settings:
+      repo: eumau/opendkim
+      auto_tag: true
+      dry_run: true
+    when:
+      ref:
+        - refs/pull/**
+
+  - name: build and publish image
+    image: plugins/docker
+    settings:
+      repo: eumau/opendkim
+      auto_tag: true
+      username:
+        from_secret: dockerhub_username
+      password:
+        from_secret: dockerhub_password
+    when:
+      branch:
+        - master

.gitignore

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+*~
+\#*
+.#*

Dockerfile

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+FROM debian:buster-slim
+ARG REMCO_VER=0.11.1
+RUN apt-get update \
+  && DEBIAN_FRONTEND=noninteractive apt-get install -y \
+    opendkim opendkim-tools wget unzip \
+  && apt-get clean \
+  && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* \
+  && wget https://github.com/HeavyHorst/remco/releases/download/v${REMCO_VER}/remco_${REMCO_VER}_linux_amd64.zip \
+  && unzip remco_${REMCO_VER}_linux_amd64.zip \
+  && rm remco_${REMCO_VER}_linux_amd64.zip \
+  && mv remco_linux /bin/remco
+COPY config /etc/remco/config
+COPY opendkim_setup.tmpl /etc/remco/templates/opendkim_setup.tmpl
+EXPOSE 8891
+ENTRYPOINT ["remco"]

config

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+log_level = "info"
+log_format = "text"
+
+[[resource]]
+name = "opendkim"
+start_cmd = "/usr/local/sbin/opendkim_setup"
+
+[resource.exec]
+command = "/usr/sbin/opendkim -f -x /etc/opendkim.conf"
+
+[[resource.template]]
+src = "/etc/remco/templates/opendkim_setup.tmpl"
+dst = "/usr/local/sbin/opendkim_setup"
+mode = "0700"
+
+[resource.backend]
+[resource.backend.env]
+keys = ["/dkimkey"]
+watch = false
+onetime = true

opendkim_setup.tmpl

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+#!/bin/bash
+
+# setup opendkim configuration and domains
+mkdir -p /etc/dkimkeys
+truncate -s0 /etc/dkimkeys/{keytable,signingtable,trustedhosts}
+
+cat - <<EOF > /etc/opendkim.conf
+KeyTable        file:/etc/dkimkeys/keytable
+SigningTable    refile:/etc/dkimkeys/signingtable 
+InternalHosts   refile:/etc/dkimkeys/trustedhosts
+Socket          inet:8891@0.0.0.0
+OversignHeaders	From
+TrustAnchorFile /usr/share/dns/root.key
+UserID          opendkim
+EOF
+
+cat - <<EOF > /etc/dkimkeys/trustedhosts
+0.0.0.0/0
+*
+EOF
+
+{% for domain in lsdir("/dkimkey") %}
+
+mkdir -p /etc/dkimkeys/{{ domain }}
+
+{% for selector in ls(printf ("/dkimkey/%s", domain)) %}
+
+echo '{{ selector }}._domainkey.{{ domain }} {{ domain }}:{{ selector }}:/etc/dkimkeys/{{ domain }}/{{ selector }}.private' >> /etc/dkimkeys/keytable
+echo '*@{{ domain }} {{ selector }}._domainkey.{{ domain }}' >> /etc/dkimkeys/signingtable
+cat - <<EOKEY > /etc/dkimkeys/{{ domain }}/{{ selector }}.private
+{% for keyline in (replace(getv(printf("/dkimkey/%s/%s",domain,selector)),"\\n","!",-1)|split:"!") %}
+{{ keyline }}
+{% endfor %}
+EOKEY
+
+{% endfor %}
+
+chown -R opendkim:opendkim /etc/dkimkeys/{{ domain }}
+chmod -R u+rw,go-rw /etc/dkimkeys/{{ domain }}
+
+{% endfor %}