Reduce build headaches.

Author: psftw

8.6/Dockerfile

@@ -1,27 +1,37 @@
-## Dockerfile for a haskell environment
-FROM       debian:stretch
-
-## ensure locale is set during build
-ENV LANG            C.UTF-8
+FROM debian:stretch
 
 RUN apt-get update && \
-    apt-get install -y --no-install-recommends gnupg ca-certificates dirmngr curl git && \
+    apt-get install -y --no-install-recommends gnupg ca-certificates dirmngr && \
+    rm -rf /var/lib/apt/lists/*
+
+RUN apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 427CB69AAC9D00F2A43CAF1CBA3CBA3FFE22B574 && \
     echo 'deb http://downloads.haskell.org/debian stretch main' > /etc/apt/sources.list.d/ghc.list && \
-    apt-key adv --keyserver keyserver.ubuntu.com --recv-keys BA3CBA3FFE22B574 && \
     apt-get update && \
-    apt-get install -y --no-install-recommends ghc-8.6.5 cabal-install-2.4 \
-        zlib1g-dev libtinfo-dev libsqlite3-dev g++ netbase xz-utils make openssh-client && \
+    apt-get install -y --no-install-recommends \
+        cabal-install-2.4 \
+        curl \
+        g++ \
+        ghc-8.6.5 \
+        git \
+        libsqlite3-dev \
+        libtinfo-dev \
+        make \
+        netbase \
+        openssh-client \
+        xz-utils \
+        zlib1g-dev && \
+    rm -rf /var/lib/apt/lists/*
+
+RUN export GNUPGHOME="$(mktemp -d)" && \
+    gpg --batch --keyserver ha.pool.sks-keyservers.net --recv-keys C5705533DA4F78D8664B5DC0575159689BEFB442 && \
     curl -fSL https://github.com/commercialhaskell/stack/releases/download/v1.9.3/stack-1.9.3-linux-x86_64.tar.gz -o stack.tar.gz && \
     curl -fSL https://github.com/commercialhaskell/stack/releases/download/v1.9.3/stack-1.9.3-linux-x86_64.tar.gz.asc -o stack.tar.gz.asc && \
-    export GNUPGHOME="$(mktemp -d)" && \
-    gpg --batch --keyserver ha.pool.sks-keyservers.net --recv-keys C5705533DA4F78D8664B5DC0575159689BEFB442 && \
-    gpg --batch --verify stack.tar.gz.asc stack.tar.gz && \
+    gpg --batch --trusted-key 0x575159689BEFB442 --verify stack.tar.gz.asc stack.tar.gz && \
     tar -xf stack.tar.gz -C /usr/local/bin --strip-components=1 && \
     /usr/local/bin/stack config set system-ghc --global true && \
     /usr/local/bin/stack config set install-ghc --global false && \
     rm -rf "$GNUPGHOME" /var/lib/apt/lists/* /stack.tar.gz.asc /stack.tar.gz
 
 ENV PATH /root/.cabal/bin:/root/.local/bin:/opt/cabal/2.4/bin:/opt/ghc/8.6.5/bin:$PATH
 
-## run ghci by default unless a command is specified
 CMD ["ghci"]

8.8/Dockerfile

@@ -1,21 +1,32 @@
-## Dockerfile for a haskell environment
-FROM       debian:stretch
-
-## ensure locale is set during build
-ENV LANG            C.UTF-8
+FROM debian:stretch
 
 RUN apt-get update && \
-    apt-get install -y --no-install-recommends gnupg ca-certificates dirmngr curl git && \
+    apt-get install -y --no-install-recommends gnupg ca-certificates dirmngr && \
+    rm -rf /var/lib/apt/lists/*
+
+RUN apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 427CB69AAC9D00F2A43CAF1CBA3CBA3FFE22B574 && \
     echo 'deb http://downloads.haskell.org/debian stretch main' > /etc/apt/sources.list.d/ghc.list && \
-    apt-key adv --keyserver keyserver.ubuntu.com --recv-keys BA3CBA3FFE22B574 && \
     apt-get update && \
-    apt-get install -y --no-install-recommends ghc-8.8.1 cabal-install-3.0 \
-        zlib1g-dev libtinfo-dev libsqlite3-dev g++ netbase xz-utils make openssh-client && \
-    curl -fSL https://github.com/commercialhaskell/stack/releases/download/v2.1.3/stack-2.1.3-linux-x86_64.tar.gz -o stack.tar.gz && \
-    curl -fSL https://github.com/commercialhaskell/stack/releases/download/v2.1.3/stack-2.1.3-linux-x86_64.tar.gz.asc -o stack.tar.gz.asc && \
-    export GNUPGHOME="$(mktemp -d)" && \
+    apt-get install -y --no-install-recommends \
+        cabal-install-3.0 \
+        curl \
+        g++ \
+        ghc-8.8.1 \
+        git \
+        libsqlite3-dev \
+        libtinfo-dev \
+        make \
+        netbase \
+        openssh-client \
+        xz-utils \
+        zlib1g-dev && \
+    rm -rf /var/lib/apt/lists/*
+
+RUN export GNUPGHOME="$(mktemp -d)" && \
     gpg --batch --keyserver ha.pool.sks-keyservers.net --recv-keys C5705533DA4F78D8664B5DC0575159689BEFB442 && \
     gpg --batch --keyserver ha.pool.sks-keyservers.net --recv-keys 2C6A674E85EE3FB896AFC9B965101FF31C5C154D && \
+    curl -fSL https://github.com/commercialhaskell/stack/releases/download/v2.1.3/stack-2.1.3-linux-x86_64.tar.gz -o stack.tar.gz && \
+    curl -fSL https://github.com/commercialhaskell/stack/releases/download/v2.1.3/stack-2.1.3-linux-x86_64.tar.gz.asc -o stack.tar.gz.asc && \
     gpg --batch --trusted-key 0x575159689BEFB442 --verify stack.tar.gz.asc stack.tar.gz && \
     tar -xf stack.tar.gz -C /usr/local/bin --strip-components=1 && \
     /usr/local/bin/stack config set system-ghc --global true && \
@@ -24,5 +35,4 @@ RUN apt-get update && \
 
 ENV PATH /root/.cabal/bin:/root/.local/bin:/opt/cabal/3.0/bin:/opt/ghc/8.8.1/bin:$PATH
 
-## run ghci by default unless a command is specified
 CMD ["ghci"]