clean up dockerfile

Author: Erk-

Dockerfile

@@ -1,3 +1,5 @@
+# syntax=docker/dockerfile:1.3-labs
+#
 # Rust syntax target, either x86_64-unknown-linux-musl, aarch64-unknown-linux-musl, arm-unknown-linux-musleabi etc.
 ARG RUST_TARGET="x86_64-unknown-linux-musl"
 # Musl target, either x86_64-linux-musl, aarch64-linux-musl, arm-linux-musleabi, etc.
@@ -10,38 +12,50 @@ ARG RUST_TARGET
 ARG MUSL_TARGET
 ARG FEATURES
 
-RUN apk upgrade && \
-    apk add curl gcc musl-dev && \
+RUN <<EOT bash
+    set -ex
+    apk upgrade
+    apk add curl gcc musl-dev
     curl -sSf https://sh.rustup.rs | sh -s -- --profile minimal --default-toolchain nightly --component rust-src -y
+EOT
 
-RUN source $HOME/.cargo/env && \
-    mkdir -p /app/.cargo && \
-    if [ "$RUST_TARGET" != $(rustup target list --installed) ]; then \
-        rustup target add $RUST_TARGET && \
-        curl -L "https://musl.cc/$MUSL_TARGET-cross.tgz" -o /toolchain.tgz && \
-        tar xf toolchain.tgz && \
-        ln -s "/$MUSL_TARGET-cross/bin/$MUSL_TARGET-gcc" "/usr/bin/$MUSL_TARGET-gcc" && \
-        ln -s "/$MUSL_TARGET-cross/bin/$MUSL_TARGET-ld" "/usr/bin/$MUSL_TARGET-ld" && \
-        ln -s "/$MUSL_TARGET-cross/bin/$MUSL_TARGET-strip" "/usr/bin/actual-strip" && \
-        GCC_VERSION=$($MUSL_TARGET-gcc --version | grep gcc | awk '{print $3}') && \
-        echo -e "\
-[build]\n\
-rustflags = [\"-L\", \"native=/$MUSL_TARGET-cross/$MUSL_TARGET/lib\", \"-L\", \"native=/$MUSL_TARGET-cross/lib/gcc/$MUSL_TARGET/$GCC_VERSION/\", \"-l\", \"static=gcc\", \"-Clink-self-contained=y\", \"-Clinker-flavor=gcc\"]\n\
-[target.$RUST_TARGET]\n\
-linker = \"$MUSL_TARGET-gcc\"\n\
-[unstable]\n\
-build-std = [\"std\", \"panic_abort\"]\n\
-" > /app/.cargo/config; \
-    else \
-        echo "skipping toolchain as we are native" && \
-        echo -e "\
-[build]\n\
-rustflags = [\"-L\", \"native=/usr/lib\"]\n\
-[unstable]\n\
-build-std = [\"std\", \"panic_abort\"]\n\
-" > /app/.cargo/config && \
-        ln -s /usr/bin/strip /usr/bin/actual-strip; \
-    fi
+RUN <<-EOT bash
+set -ex
+
+source $HOME/.cargo/env
+mkdir -p /app/.cargo
+if [ "$RUST_TARGET" != $(rustup target list --installed) ]; then
+    rustup target add $RUST_TARGET
+    curl -L "https://musl.cc/$MUSL_TARGET-cross.tgz" -o /toolchain.tgz
+    tar xf toolchain.tgz
+    ln -s "/$MUSL_TARGET-cross/bin/$MUSL_TARGET-gcc" "/usr/bin/$MUSL_TARGET-gcc"
+    ln -s "/$MUSL_TARGET-cross/bin/$MUSL_TARGET-ld" "/usr/bin/$MUSL_TARGET-ld"
+    ln -s "/$MUSL_TARGET-cross/bin/$MUSL_TARGET-strip" "/usr/bin/actual-strip"
+    GCC_VERSION=$($MUSL_TARGET-gcc --version | grep gcc | awk '{print $3}')
+    echo -e "\
+         [build]\n\
+         rustflags = [\"-L\", \"native=/$MUSL_TARGET-cross/$MUSL_TARGET/lib\", \
+                      \"-L\", \"native=/$MUSL_TARGET-cross/lib/gcc/$MUSL_TARGET/$GCC_VERSION/\", \
+                      \"-l\", \"static=gcc\", \
+                      \"-C\", \"link-self-contained=y\", \
+                      \"-C\", \"linker-flavor=gcc\"\
+                     ]\n\
+         [target.$RUST_TARGET]\n\
+         linker = \"$MUSL_TARGET-gcc\"\n\
+         [unstable]\n\
+         build-std = [\"std\", \"panic_abort\"]\n\
+" > /app/.cargo/config;
+else
+    echo "skipping toolchain as we are native"
+    echo -e "\
+         [build]\n\
+         rustflags = [\"-L\", \"native=/usr/lib\"]\n\
+         [unstable]\n\
+         build-std = [\"std\", \"panic_abort\"]\n\
+" > /app/.cargo/config
+    ln -s /usr/bin/strip /usr/bin/actual-strip;
+fi    
+EOT
 
 WORKDIR /app
 
@@ -50,16 +64,20 @@ COPY ./Cargo.toml ./Cargo.toml
 
 # We need a source directory so that it builds the dependencies and an empty
 # binary.
-RUN mkdir src/
-RUN echo 'fn main() {}' > ./src/main.rs
-RUN source $HOME/.cargo/env && \
-    if [ "$FEATURES" == "" ]; then \
+RUN <<-EOT bash
+    set -ex
+
+    mkdir src/
+    echo 'fn main() {}' -> ./src/main.rs
+    source $HOME/.cargo/env
+    if [ "$FEATURES" == "" ]; then
       cargo build --release \
-          --target="$RUST_TARGET"; \
-    else \
+          --target="$RUST_TARGET";
+    else
       cargo build --release \
-          --target="$RUST_TARGET" --features="$FEATURES"; \
+          --target="$RUST_TARGET" --features="$FEATURES";
     fi
+EOT
 
 # Now, delete the fake source and copy in the actual source. This allows us to
 # have a previous compilation step for compiling the dependencies, while being
@@ -74,16 +92,20 @@ RUN source $HOME/.cargo/env && \
 RUN rm -f target/$RUST_TARGET/release/deps/twilight_http_proxy*
 COPY ./src ./src
 
-RUN source $HOME/.cargo/env && \
-    if [ "$FEATURES" == "" ]; then \
+RUN <<-EOT bash
+    set -ex
+
+    source $HOME/.cargo/env
+    if [ "$FEATURES" == "" ]; then
       cargo build --release \
-          --target="$RUST_TARGET"; \
-    else \
+          --target="$RUST_TARGET"
+    else
       cargo build --release \
-          --target="$RUST_TARGET" --features="$FEATURES"; \
-    fi && \
-    cp target/$RUST_TARGET/release/twilight-http-proxy /twilight-http-proxy && \
+          --target="$RUST_TARGET" --features="$FEATURES"
+    fi
+    cp target/$RUST_TARGET/release/twilight-http-proxy /twilight-http-proxy
     actual-strip /twilight-http-proxy
+EOT
 
 FROM scratch