add tasks and correct dockerfile to alpine

.drone.yml

@@ -5,4 +5,4 @@ name: exec-debian-memiks
 steps:
 - name: docker build
   commands:
-  - docker build -t 'opensmtpd-debian' .
+  - docker build -t 'opensmtpd-alpine' .

.vscode/tasks.json

@@ -0,0 +1,36 @@
+{
+    // See https://go.microsoft.com/fwlink/?LinkId=733558
+    // for the documentation about the tasks.json format
+    "version": "2.0.0",
+    "tasks": [
+        {
+            "label": "docker build",
+            "type": "shell",
+            "command": "docker build -t ${workspaceFolderBasename} . ",
+            "group": {
+                "kind": "build",
+                "isDefault": true
+            }
+        },
+        {
+            "label": "into docker image",
+            "type": "shell",
+            "windows":{"command": "c:/Program Files/Docker/Docker/Resources/bin/docker"},
+            "args": [
+                    "run",
+                    "--rm",
+                    "-it",
+                    "${input:dockerID}",
+                    "bash"
+                    ]
+        }
+    ],
+    "inputs": [
+        {
+            "id":"dockerID",
+            "description": "docker id to deep into",
+            "default": "ex: b950ac16e056",
+            "type": "promptString"
+        }
+    ]
+}

Dockerfile

@@ -1,24 +1,44 @@
-FROM debian
+FROM alpine
 LABEL Maintainer="Memiks <contact@memiks.fr>" \
-      Description="Lightweight container with OpenSMTPD on Debian Linux."
+      Description="Lightweight container with OpenSMTPD on Alpine Linux."
 
-# Install packages
+# Allow container to expose ports at runtime, if necessary
-RUN apt -qy update
+# https://docs.docker.com/engine/reference/#expose
+EXPOSE 25
+EXPOSE 465
+EXPOSE 587
 
-RUN apt-get install -qy \
+# install necessary packages
-    build-essential linux-libc-dev \
+RUN apk add --no-cache \
-    autoconf automake autoconf bison libevent-dev libasr-dev cmake libtool pkg-config \
+    autoconf \
-    git curl gawk tar bzip2 ncompress xz-utils tree wget
+    automake \
-
+    bison \
-WORKDIR /tmp
+    ca-certificates \
-ENV LIBRESSLVERSION=libressl-3.0.2
+    fts-dev \
-RUN wget  -O ${LIBRESSLVERSION}.tar.gz https://ftp.openbsd.org/pub/OpenBSD/LibreSSL/${LIBRESSLVERSION}.tar.gz
+    gcc \
-RUN tar xf ${LIBRESSLVERSION}.tar.gz
+    fts \
-
+    libasr-dev \
-WORKDIR /tmp/${LIBRESSLVERSION}
+    libevent-dev \
-
+    libtool \
-RUN ./configure --prefix=/usr/local/libressl --with-openssldir=/usr/local/libressl
+    libtool \
-RUN make && make install
+    linux-pam-dev \
+    make \
+    musl-dev \
+    openssl \
+    openssl-dev \
+    zlib-dev \
+    git
+ 
+# create users and directories
+# note: alpine uses busybox and useradd is not available there
+# also long flags are not available too, so sorry for the 
+RUN mkdir -p /var/lib/opensmtpd/empty \
+  && adduser _smtpd -h /var/lib/opensmtpd/empty/ -D -H -s /bin/false \
+  && adduser _smtpq -h /var/lib/opensmtpd/empty/ -D -H -s /bin/false \
+  && mkdir -p /var/spool/smtpd \
+  && mkdir -p /var/mail \
+  && mkdir -p /etc/mail \
+  && chmod 711 /var/spool/smtpd
 
 WORKDIR /tmp
 RUN git clone -b portable git://github.com/OpenSMTPD/OpenSMTPD.git opensmtpd
@@ -26,11 +46,27 @@ RUN git clone -b portable git://github.com/OpenSMTPD/OpenSMTPD.git opensmtpd
 WORKDIR /tmp/opensmtpd
 RUN ./bootstrap \
   && ./configure \
-  --with-libssl=/usr/local/libressl
+  --prefix=/usr \
+  --sbindir=/usr/bin \
+  --libexecdir=/usr/lib/smtpd \
+  --sysconfdir=/etc/smtpd \
+  --with-user-smtpd=smtpd \
+  --with-user-queue=smtpq \
+  --with-group-queue=smtpq \
+  --with-gnu-ld \
+  --with-auth-pam
 
 RUN make && make install
+#RUN etc/aliases /etc/mail/aliases
+
+RUN addgroup smtpq
+RUN adduser -D -S -G smtpq smtpq
+RUN addgroup smtpd
+RUN adduser -D -S -G smtpd smtpd
+
+USER smtpd
+
+WORKDIR /etc/smtpd
 
 # Override shell for bash-y debugging goodness
 SHELL ["/bin/bash", "-exc"]
-
-WORKDIR /tmp