streamlining container image builds with hacky dummy file

Cargo.toml

@@ -3,6 +3,9 @@ name = "wownero-explorer"
 version = "0.1.0"
 authors = ["lza_menace <lza_menace@protonmail.com>"]
 edition = "2018"
+[[bin]]
+name = "wownero-explorer"
+path = "src/main.rs"
 
 [dependencies]
 rocket = "0.4.4"

Dockerfile

@@ -1,22 +1,32 @@
 FROM ubuntu:19.10 as builder
 
+# Install required packages
 RUN apt-get update && apt-get install -y build-essential
-
 RUN apt-get install -y curl git
 
+# Setup app user and workspace
 RUN useradd -m -d /home/wownero-explorer wownero-explorer
-
+RUN mkdir -p /srv/wownero-explorer && chown -R wownero-explorer:wownero-explorer /srv
-RUN mkdir -p /srv && chown -R wownero-explorer:wownero-explorer /srv
-
 USER wownero-explorer
-WORKDIR /srv
+WORKDIR /srv/wownero-explorer
 
+# Install Rust
 RUN curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | RUSTUP_HOME=/home/wownero-explorer/.rustup sh -s -- -y
-RUN git clone https://git.wownero.com/lza_menace/wownero-explorer && \
-  cd wownero-explorer && \
-  ~/.cargo/bin/rustup override set nightly && \
-  ~/.cargo/bin/cargo build --release
 
-FROM ubuntu:19.10
+# Setup dummy build and perform release
+COPY dummy.rs .
+COPY Cargo.toml .
+COPY Cargo.lock .
+RUN sed -i 's_src/main.rs_dummy.rs_' Cargo.toml
+RUN ~/.cargo/bin/rustup override set nightly
+RUN ~/.cargo/bin/cargo build --release
+
+# Put real source onto image and perform release
+RUN sed -i 's_dummy.rs_src/main.rs_' Cargo.toml
+COPY src src
+RUN ~/.cargo/bin/cargo build --release
 
+FROM ubuntu:19.10
 COPY --from=builder /srv/wownero-explorer/target/release/wownero-explorer /bin/wownero-explorer
+COPY static static
+COPY templates templates

dummy.rs

@@ -0,0 +1 @@
+fn main() {}