ref: fix install of gosu / tini

Dockerfile

@@ -2,57 +2,26 @@ FROM python:3.7-slim AS application
 
 RUN groupadd -r cdc && useradd -r -g cdc cdc
 
-# grab gosu for easy step-down from root
-RUN set -x \
-    && export GOSU_VERSION=1.11 \
-    && fetchDeps=" \
-        dirmngr \
-        gnupg \
-        wget \
-    " \
-    && apt-get update && apt-get install -y --no-install-recommends $fetchDeps && rm -rf /var/lib/apt/lists/* \
-    && wget -O /usr/local/bin/gosu "https://github.com/tianon/gosu/releases/download/$GOSU_VERSION/gosu-$(dpkg --print-architecture)" \
-    && wget -O /usr/local/bin/gosu.asc "https://github.com/tianon/gosu/releases/download/$GOSU_VERSION/gosu-$(dpkg --print-architecture).asc" \
-    && export GNUPGHOME="$(mktemp -d)" \
-    && for key in \
-      B42F6819007F00F88E364FD4036A9C25BF357DD4 \
-    ; do \
-      gpg --batch --keyserver hkp://p80.pool.sks-keyservers.net:80 --recv-keys "$key" || \
-      gpg --batch --keyserver hkp://ipv4.pool.sks-keyservers.net --recv-keys "$key" || \
-      gpg --batch --keyserver hkp://pgp.mit.edu:80 --recv-keys "$key" ; \
-    done \
-    && gpg --batch --verify /usr/local/bin/gosu.asc /usr/local/bin/gosu \
-    && gpgconf --kill all \
-    && rm -r "$GNUPGHOME" /usr/local/bin/gosu.asc \
-    && chmod +x /usr/local/bin/gosu \
-    && gosu nobody true \
-    && apt-get purge -y --auto-remove $fetchDeps
+ARG GOSU_VERSION=1.17
+ARG GOSU_SHA256=bbc4136d03ab138b1ad66fa4fc051bafc6cc7ffae632b069a53657279a450de3
+ARG TINI_VERSION=0.19.0
+ARG TINI_SHA256=93dcc18adc78c65a028a84799ecf8ad40c936fdfc5f2a57b1acda5a8117fa82c
 
-# grab tini for signal processing and zombie killing
 RUN set -x \
-    && export TINI_VERSION=0.18.0 \
-    && fetchDeps=" \
-        dirmngr \
-        gnupg \
-        wget \
-    " \
-    && apt-get update && apt-get install -y --no-install-recommends $fetchDeps && rm -rf /var/lib/apt/lists/* \
-    && wget -O /usr/local/bin/tini "https://github.com/krallin/tini/releases/download/v$TINI_VERSION/tini-$(dpkg --print-architecture)" \
-    && wget -O /usr/local/bin/tini.asc "https://github.com/krallin/tini/releases/download/v$TINI_VERSION/tini-$(dpkg --print-architecture).asc" \
-    && export GNUPGHOME="$(mktemp -d)" \
-    && for key in \
-      595E85A6B1B4779EA4DAAEC70B588DFF0527A9B7 \
-    ; do \
-      gpg --batch --keyserver hkp://p80.pool.sks-keyservers.net:80 --recv-keys "$key" || \
-      gpg --batch --keyserver hkp://ipv4.pool.sks-keyservers.net --recv-keys "$key" || \
-      gpg --batch --keyserver hkp://pgp.mit.edu:80 --recv-keys "$key" ; \
-    done \
-    && gpg --batch --verify /usr/local/bin/tini.asc /usr/local/bin/tini \
-    && gpgconf --kill all \
-    && rm -r "$GNUPGHOME" /usr/local/bin/tini.asc \
-    && chmod +x /usr/local/bin/tini \
-    && tini -h \
-    && apt-get purge -y --auto-remove $fetchDeps
+  && buildDeps=" \
+  wget \
+  " \
+  && apt-get update && apt-get install -y --no-install-recommends $buildDeps \
+  && rm -rf /var/lib/apt/lists/* \
+  # grab gosu for easy step-down from root
+  && wget --quiet -O /usr/local/bin/gosu "https://github.com/tianon/gosu/releases/download/$GOSU_VERSION/gosu-amd64" \
+  && echo "$GOSU_SHA256 /usr/local/bin/gosu" | sha256sum --check --status \
+  && chmod +x /usr/local/bin/gosu \
+  # grab tini for signal processing and zombie killing
+  && wget --quiet -O /usr/local/bin/tini "https://github.com/krallin/tini/releases/download/v$TINI_VERSION/tini-amd64" \
+  && echo "$TINI_SHA256 /usr/local/bin/tini" | sha256sum --check --status \
+  && chmod +x /usr/local/bin/tini \
+  && apt-get purge -y --auto-remove $buildDeps
 
 RUN mkdir -p /usr/src/app
 WORKDIR /usr/src/app