Build Github release using Ubuntu 16.04 Docker image #624 (#642)

* Try to build on Linux using ubuntu:xenial-20151218.1 based docker image.

* Map cargo dependencies cache to host dir.

* Fix docker run.

* Run tests in docker.

* Build Linux binary using xenial image for Github release only.

* Try to use host user and workdir avoid various permission and different paths issues.

* Set HOME=/root and explicitly set cargo env.

* Use target-xenial path in Dockerfile.release.

* Release on mm2 branch only again.

Dockerfile.release

@@ -1,6 +1,6 @@
 FROM ubuntu:bionic
 WORKDIR /mm2
-COPY target/release/mm2 /app/mm2
+COPY target-xenial/release/mm2 /app/mm2
 EXPOSE 7783
 ENV PATH="/app:${PATH}"
 CMD mm2

Dockerfile.ubuntu.ci

@@ -0,0 +1,26 @@
+FROM ubuntu:xenial-20151218.1
+
+RUN \
+    apt-get update &&\
+    apt-get install -y git build-essential libssl-dev wget &&\
+    apt-get install -y cmake &&\
+    # https://github.com/rust-lang/rust-bindgen/blob/master/book/src/requirements.md#debian-based-linuxes
+    apt-get install -y llvm-3.9-dev libclang-3.9-dev clang-3.9 &&\
+    # openssl-sys requirements, cf. https://crates.io/crates/openssl-sys
+    apt-get install -y pkg-config libssl-dev &&\
+    apt-get clean
+
+RUN \
+    wget -O- https://sh.rustup.rs > /tmp/rustup-init.sh &&\
+    sh /tmp/rustup-init.sh -y --default-toolchain none &&\
+    . /root/.cargo/env &&\
+    rustup set profile minimal &&\
+    rustup install nightly-2020-02-01 &&\
+    rustup default nightly-2020-02-01 &&\
+    # It seems that bindgen won't prettify without it:
+    rustup component add rustfmt-preview &&\
+    rm -f /tmp/rustup-init.sh &&\
+    chmod -R 777 /root
+
+ENV PATH="/root/.cargo/bin:${PATH}"
+WORKDIR /mm2

azure-pipelines-release-stage-job.yml

@@ -48,11 +48,27 @@ jobs:
           echo 2.0.$(Build.BuildId)_$(Build.SourceBranchName)_$(COMMIT_HASH)_$(Agent.OS)_Debug > MM_VERSION
           cat MM_VERSION
           touch mm2src/common/build.rs
-          cargo build --features native -vv
+          if [ $AGENT_OS = "Linux" ]
+          then
+            docker build -f Dockerfile.ubuntu.ci -t mm2_builder .
+            export UID=$(id -u)
+            export GID=$(id -g)
+            docker run \
+            --user $UID:$GID \
+            -v /home/azureagent/docker-cargo-cache/git:/root/.cargo/git \
+            -v /home/azureagent/docker-cargo-cache/registry:/root/.cargo/registry \
+            -v $PWD:$PWD \
+            -w $PWD \
+            -e HOME=/root \
+            mm2_builder \
+            /bin/bash -c "source /root/.cargo/env && cargo build --features native -vv --target-dir target-xenial"
+          else
+            cargo build --features native -vv
+          fi
         displayName: 'Build MM2 Debug'
         condition: eq( variables['DEBUG_UPLOADED'], '' )
       - bash: |
-          zip upload/mm2-$(COMMIT_HASH)-$(Agent.OS)-Debug target/debug/mm2 -j
+          zip upload/mm2-$(COMMIT_HASH)-$(Agent.OS)-Debug target-xenial/debug/mm2 -j
         displayName: 'Prepare debug build upload Linux'
         condition: and( eq( variables['Agent.OS'], 'Linux' ), eq( variables['DEBUG_UPLOADED'], '' ) )
       - bash: |
@@ -69,14 +85,30 @@ jobs:
           echo 2.0.$(Build.BuildId)_$(Build.SourceBranchName)_$(COMMIT_HASH)_$(Agent.OS)_Release > MM_VERSION
           cat MM_VERSION
           touch mm2src/common/build.rs
-          cargo build --features native --release -vv
+          if [ $AGENT_OS = "Linux" ]
+          then
+            docker build -f Dockerfile.ubuntu.ci -t mm2_builder .
+            export UID=$(id -u)
+            export GID=$(id -g)
+            docker run \
+            --user $UID:$GID \
+            -v /home/azureagent/docker-cargo-cache/git:/root/.cargo/git \
+            -v /home/azureagent/docker-cargo-cache/registry:/root/.cargo/registry \
+            -v $PWD:$PWD \
+            -w $PWD \
+            -e HOME=/root \
+            mm2_builder \
+            /bin/bash -c "source /root/.cargo/env && cargo build --features native --release -vv --target-dir target-xenial"
+          else
+            cargo build --features native --release -vv
+          fi
         displayName: 'Build MM2 Release'
         condition: eq( variables['RELEASE_UPLOADED'], '' )
       - bash: |
-          objcopy --only-keep-debug target/release/mm2 target/release/mm2.debug
-          strip -g target/release/mm2
-          zip upload/mm2-$(COMMIT_HASH)-$(Agent.OS)-Release target/release/mm2 -j
-          zip upload/mm2-$(COMMIT_HASH)-$(Agent.OS)-Release-debuginfo.zip target/release/mm2.debug -j
+          objcopy --only-keep-debug target-xenial/release/mm2 target-xenial/release/mm2.debug
+          strip -g target-xenial/release/mm2
+          zip upload/mm2-$(COMMIT_HASH)-$(Agent.OS)-Release target-xenial/release/mm2 -j
+          zip upload/mm2-$(COMMIT_HASH)-$(Agent.OS)-Release-debuginfo.zip target-xenial/release/mm2.debug -j
         displayName: 'Prepare release build upload Linux'
         condition: and( eq( variables['Agent.OS'], 'Linux' ), eq( variables['RELEASE_UPLOADED'], '' ) )
       - bash: |