chore(dockerfile): update labels

Dockerfile

@@ -1,5 +1,5 @@
 #
-# simple postfix smarthost smtp relay
+# simple postfix smtp relay
 #
 
 FROM alpine:3.13
@@ -9,13 +9,13 @@ LABEL author="Asif Bacchus <asif@bacchus.cloud>"
 LABEL maintainer="Asif Bacchus <asif@bacchus.cloud>"
 LABEL org.label-schema.schema-version="1.0"
 LABEL org.label-schema.docker.cmd=""
-LABEL org.label-schema.description="Simple postfix smarthost smtp mail relay on Alpine Linux."
-LABEL org.label-schema.url=""
-LABEL org.label-schema.usage=""
-LABEL org.label-schema.vcs-url=""
+LABEL org.label-schema.description="Simple postfix smtp mail relay on Alpine."
+LABEL org.label-schema.url="https://git.asifbacchus.app/ab-docker/postfix-smtp-relay"
+LABEL org.label-schema.usage="https://git.asifbacchus.app/ab-docker/postfix-smtp-relay"
+LABEL org.label-schema.vcs-url="https://git.asifbacchus.app/ab-docker/postfix-smtp-relay.git"
 
-# install mSMTP
-RUN apk --no-cache \
+# install packages and clean-up
+RUN apk --no-cache add \
     ca-certificates \
     postfix \
     bind-tools \
@@ -23,8 +23,8 @@ RUN apk --no-cache \
 
 # set environment variables
 ENV TZ=Etc/UTC
-ENV LOCAL_HOSTNAME=${HOSTNAME}
-ENV LOCAL_DOMAINNAME=${HOSTNAME#*.}
+ENV LOCAL_HOSTNAME=""
+ENV LOCAL_DOMAINNAME=""
 ENV LOCAL_ENCRYPTION=false
 ENV SMARTHOST=""
 ENV SMARTHOST_PORT=587
@@ -41,8 +41,8 @@ ENTRYPOINT [ "/usr/local/bin/entrypoint.sh" ]
 CMD [ "/usr/local/sbin/postfix", "start-fg" ]
 
 # set parameters, vendor, version and build-date labels
-LABEL org.label-schema.docker.params="TZ=Etc/UTC, HOSTNAME=HOSTNAME, DOMAINNAME=(derived from hostname), LOCAL_ENCRYPTION=false, SMARTHOST, SMARTHOST_PORT=587, SMARTHOST_USERNAME, SMARTHOST_PASSWORD, SMARTHOST_ENCRYPTION='OPTIONAL'"
+LABEL org.label-schema.docker.params="TZ=Etc/UTC, HOSTNAME=(container hostname), DOMAINNAME=(derived from hostname), LOCAL_ENCRYPTION=false|optional|true, SMARTHOST=..., SMARTHOST_PORT=587, SMARTHOST_USERNAME=..., SMARTHOST_PASSWORD=..., SMARTHOST_ENCRYPTION=optional|false|true"
 LABEL org.label-schema.vendor="Alpine 3.13, Postfix 3.5.10-r0"
-LABEL org.label-schema.version="0.1"
+LABEL org.label-schema.version="0.5"
 ARG BUILD_DATE
 LABEL org.label-schema.build-date=${BUILD_DATE}

entrypoint.sh

@@ -8,70 +8,89 @@ convertCase () {
     printf "%s" "$1" | tr "[:lower:]" "[:upper:]"
 }
 
-printf "\nVerifying environment variables... "
+if [ -f "/etc/postfix/main.cf.override" ]; then
+    # use provided configuration file
+    printf "\nAppending provided MAIN configuration... "
+    cat /etc/postfix/main.cf.override >> /etc/postfix/main.cf
+    \rm -f /tmp/main.cf.insert
+else
+    # process auto-setup
+    printf "\nVerifying environment variables... "
 
-# check for missing environment variable values
-if [ -z "$SMARTHOST" ]; then
-    printf "\nYou must specify the hostname or IP address of a smarthost where mail should be relayed.\n\n"
-fi
-if [ -z "$SMARTHOST_USERNAME" ]; then
-    printf "\nYou must provide a username for smarthost authentication.\n\n"
-fi
-if [ -z "$SMARTHOST_PASSWORD" ]; then
-    printf "\nYou must provide a password for smarthost authentication.\n\n"
-fi
+    # check for missing environment variable values
+    if [ -z "$SMARTHOST" ]; then
+        printf "\nYou must specify the hostname or IP address of a smarthost where mail should be relayed.\n\n"
+        exit 1
+    fi
+    if [ -z "$SMARTHOST_USERNAME" ]; then
+        printf "\nYou must provide a username for smarthost authentication.\n\n"
+        exit 1
+    fi
+    if [ -z "$SMARTHOST_PASSWORD" ]; then
+        printf "\nYou must provide a password for smarthost authentication.\n\n"
+        exit 1
+    fi
 
-# set failsafes
-[ -z "$SMARTHOST_PORT" ] && SMARTHOST_PORT=587
-[ -z "$LOCAL_HOSTNAME" ] && LOCAL_HOSTNAME="smarthost"
-[ -z "$LOCAL_DOMAINNAME" ] && LOCAL_DOMAINNAME="smarthost"
+    # set failsafes
+    [ -z "$SMARTHOST_PORT" ] && SMARTHOST_PORT=587
+    [ -z "$LOCAL_HOSTNAME" ] && LOCAL_HOSTNAME="$(uname -n)"
+    [ -z "$LOCAL_DOMAINNAME" ] && LOCAL_DOMAINNAME="${LOCAL_HOSTNAME#*.}"
 
+    printf "done\n"
+    printf "updating configuration files... "
+
+    # update main.cf
+    sed -i "s/{LOCAL_HOSTNAME}/${LOCAL_HOSTNAME}/" /tmp/main.cf.insert
+    sed -i "s/{LOCAL_DOMAINNAME}/${LOCAL_DOMAINNAME}/" /tmp/main.cf.insert
+    sed -i "s/{SMARTHOST}/${SMARTHOST}/" /tmp/main.cf.insert
+    sed -i "s/{SMARTHOST_PORT}/${SMARTHOST_PORT}/" /tmp/main.cf.insert
+    sed -i "s/{SMARTHOST_USERNAME}/${SMARTHOST_USERNAME}/" /tmp/main.cf.insert
+    sed -i "s/{SMARTHOST_PASSWORD}/${SMARTHOST_PASSWORD}/" /tmp/main.cf.insert
+
+    LOCAL_ENCRYPTION="$(convertCase "$LOCAL_ENCRYPTION")"
+    case "$LOCAL_ENCRYPTION" in
+        OPT*)
+            sed -i 's/{LOCAL_ENCRYPTION}/may/' /tmp/main.cf.insert
+            sed -i 's/#smtpd_/smtpd_/g' /tmp/main.cf.insert
+            ;;
+        TRUE)
+            sed -i 's/{LOCAL_ENCRYPTION}/encrypt/' /tmp/main.cf.insert
+            sed -i 's/#smtpd_/smtpd_/g' /tmp/main.cf.insert
+            ;;
+        *)
+            sed -i 's/{LOCAL_ENCRYPTION}//' /tmp/main.cf.insert
+            ;;
+    esac
+
+    SMARTHOST_ENCRYPTION="$(convertCase "$SMARTHOST_ENCRYPTION")"
+    case "$SMARTHOST_ENCRYPTION" in
+        OPT*)
+            sed -i 's/{SMARTHOST_ENCRYPTION}/may/' /tmp/main.cf.insert
+            ;;
+        TRUE)
+            sed -i 's/{SMARTHOST_ENCRYPTION}/secure/' /tmp/main.cf.insert
+            ;;
+        *)
+            sed -i 's/{SMARTHOST_ENCRYPTION}/none/' /tmp/main.cf.insert
+            ;;
+    esac
+
+    # append configuration and remove temp file
+    cat /tmp/main.cf.insert >> /etc/postfix/main.cf
+    \rm -f /tmp/main.cf.insert
+fi
 printf "done\n"
-printf "updating configuration files... "
-
-# update main.cf
-sed -i "s/{LOCAL_HOSTNAME}/${LOCAL_HOSTNAME}/" /tmp/main.cf.insert
-sed -i "s/{LOCAL_DOMAINNAME}/${LOCAL_DOMAINNAME}/" /tmp/main.cf.insert
-sed -i "s/{SMARTHOST}/${SMARTHOST}/" /tmp/main.cf.insert
-sed -i "s/{SMARTHOST_PORT}/${SMARTHOST_PORT}/" /tmp/main.cf.insert
-sed -i "s/{SMARTHOST_USERNAME}/${SMARTHOST_USERNAME}/" /tmp/main.cf.insert
-sed -i "s/{SMARTHOST_PASSWORD}/${SMARTHOST_PASSWORD}/" /tmp/main.cf.insert
-
-LOCAL_ENCRYPTION="$(convertCase "$LOCAL_ENCRYPTION")"
-case "$LOCAL_ENCRYPTION" in
-    OPT*)
-        sed -i 's/{LOCAL_ENCRYPTION}/may/' /tmp/main.cf.insert
-        sed -i 's/#smtpd_/smtpd_/g' /tmp/main.cf.insert
-        ;;
-    TRUE)
-        sed -i 's/{LOCAL_ENCRYPTION}/encrypt/' /tmp/main.cf.insert
-        sed -i 's/#smtpd_/smtpd_/g' /tmp/main.cf.insert
-        ;;
-    *)
-        sed -i 's/{LOCAL_ENCRYPTION}//' /tmp/main.cf.insert
-        ;;
-esac
-
-SMARTHOST_ENCRYPTION="$(convertCase "$SMARTHOST_ENCRYPTION")"
-case "$SMARTHOST_ENCRYPTION" in
-    OPT*)
-        sed -i 's/{SMARTHOST_ENCRYPTION}/may/' /tmp/main.cf.insert
-        ;;
-    TRUE)
-        sed -i 's/{SMARTHOST_ENCRYPTION}/secure/' /tmp/main.cf.insert
-        ;;
-    *)
-        sed -i 's/{SMARTHOST_ENCRYPTION}/none/' /tmp/main.cf.insert
-        ;;
-esac
-
-cat /tmp/main.cf.insert >> /etc/postfix/main.cf
-rm -f /tmp/main.cf.insert
-
-# update master.cf
-sed -i 's/#tlsproxy/tlsproxy/' /etc/postfix/master.cf
 
+if [ -f "/etc/postfix/master.cf.override" ]; then
+    # use provided configuration file
+    printf "\nUsing provided MASTER configuration... "
+    \cp --force /etc/postfix/master.cf.override /etc/postfix/master.cf
+else
+    # update master.cf
+    sed -i 's/#tlsproxy/tlsproxy/' /etc/postfix/master.cf
+fi
 printf "done\n"
+
 printf "container setup complete!\n"
 
 # run CMD passed to this container

main.cf.insert

@@ -13,7 +13,7 @@ relayhost = [{SMARTHOST}]:{SMARTHOST_PORT}
 
 #smtpd_tls_chain_files = /certs/privkey.pem, /certs/fullchain.pem
 #smtpd_tls_mandatory_ciphers = high
-#smptd_tls_mandatory_exclude_ciphers = aNULL, MD5
+#smtpd_tls_mandatory_exclude_ciphers = aNULL, MD5
 #smtpd_tls_mandatory_protocols = >=TLSv1.2
 #smtpd_tls_security_level = {LOCAL_ENCRYPTION}