Remove unnecessary dependencies

.dockerignore

@@ -0,0 +1,6 @@
+*
+
+!.dockerignore
+!*.sh
+!gpgparams
+!Dockerfile

.gitignore

@@ -1,6 +1,7 @@
 *
 
 !.gitignore
+!.dockerignore
 !LICENSE
 !README.md
 !*.sh

Dockerfile

@@ -1,26 +1,20 @@
+FROM debian:buster-slim AS setup
+
+COPY setup.sh /bin/
+RUN bash /bin/setup.sh
+
+
 FROM debian:buster-slim
 LABEL maintainer="Xiaonan Shen <s@sxn.dev>"
 
 EXPOSE 25/tcp
 EXPOSE 143/tcp
-ENV DEB_URL https://protonmail.com/download/protonmail-bridge_1.2.6-1_amd64.deb
-WORKDIR /root
 
 # Copy gpg parameters and .deb installer
-COPY gpgparams /protonmail/
+COPY gpgparams install.sh entrypoint.sh /protonmail/
+COPY --from=setup /protonmail/protonmail.deb /protonmail/
 
 # Install dependencies and protonmail bridge
-RUN apt-get update \
-    && apt-get install -y --no-install-recommends socat pass \
-    && apt-get install -y wget \
-    && wget -O /protonmail/protonmail.deb ${DEB_URL} \
-    && apt-get install -y --no-install-recommends /protonmail/protonmail.deb \
-    && apt-get purge -y wget \
-    && apt-get autoremove -y \
-    && rm -rf /var/lib/apt/lists/* \
-    && rm /protonmail/protonmail.deb
+RUN bash /protonmail/install.sh
 
-COPY entrypoint.sh /bin/
-RUN chmod +x /bin/entrypoint.sh
-
-ENTRYPOINT ["/bin/entrypoint.sh"]
+ENTRYPOINT ["bash", "/protonmail/entrypoint.sh"]

install.sh

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+#!/bin/bash
+
+set -x
+
+# Install dependents
+# libgl1-mesa-glx is installed since the bridge requires libgl and we removed the qt dependencies
+apt-get update
+apt-get install -y --no-install-recommends socat pass libgl1-mesa-glx
+
+# Install protonmail bridge
+apt-get install -y --no-install-recommends /protonmail/protonmail.deb
+
+# Cleanup
+rm -rf /var/lib/apt/lists/*
+rm /protonmail/protonmail.deb

setup.sh

@@ -0,0 +1,24 @@
+#!/bin/bash
+
+set -x
+
+DEB_URL=https://protonmail.com/download/protonmail-bridge_1.2.6-1_amd64.deb
+
+# Install tools
+apt-get update
+apt-get install -y wget binutils xz-utils
+
+# Download deb
+mkdir /protonmail
+cd /protonmail
+wget -O /protonmail/protonmail.deb ${DEB_URL}
+
+# Remove unnecessary dependencies
+ar x -v protonmail.deb
+mkdir control
+tar xvfJ control.tar.xz -C control
+cd control
+sed -i "s/^Depends: .*$/Depends: libsecret-1-0/" control
+tar cvfJ ../control.tar.xz .
+cd ../
+ar rcs -v protonmail.deb debian-binary control.tar.xz data.tar.xz