feat(superchain): add mono toolchain (#687)

Makes the `mono` tools available for consumers, including the `signtool`
command that is used for applying AuthentiCode signatures to the .NET
`.dll` artifacts.

.travis.yml

@@ -8,10 +8,6 @@ branches:
 services:
   - docker
 
-before_script:
-  # Attempt to pre-cache the previous version of the image, to speed build up
-  - docker pull jsii/superchain:nightly || true
-
 script:
   - set -eo pipefail
   # Building the Docker image
@@ -20,6 +16,7 @@ script:
   - docker run --rm -it --net=host -v ${PWD}:${PWD} -w ${PWD} jsii/superchain:nightly ./build.sh
   # Make sure the build did not change the source tree (git diff-index will return non-zero if that's the case)
   - git diff-index --exit-code --ignore-space-at-eol --stat HEAD
+  - untracked=$(git ls-files --others --exclude-standard) && echo "${untracked}" && test -z "${untracked}"
   # Publish the image to DockerHub when relevant
   - echo "TRAVIS_PULL_REQUEST = ${TRAVIS_PULL_REQUEST:-}"
   - echo "TRAVIS_TAG          = ${TRAVIS_TAG:-}"

superchain/Dockerfile

@@ -10,9 +10,9 @@ RUN yum -y upgrade
 ###
 
 # Install NVM and Node 8+
-ENV NVM_DIR=/usr/local/nvm                                                                                              \
-    NODE_VERSION=8.16.0                                                                                                 \
-    NPM_VERSION=6.8.0
+ARG NODE_VERSION=8.16.0
+ARG NPM_VERSION=6.8.0
+ENV NVM_DIR=/usr/local/nvm
 RUN curl -sSL https://raw.githubusercontent.com/nvm-sh/nvm/v0.34.0/install.sh -o /tmp/install-nvm.sh                    \
   && echo "ef7ad1db40c92f348c0461f24983b71ba0ea7d45d4007a36e484270fa7f81fcf /tmp/install-nvm.sh" | sha256sum -c         \
   && mkdir -p ${NVM_DIR}                                                                                                \
@@ -26,11 +26,15 @@ RUN curl -sSL https://raw.githubusercontent.com/nvm-sh/nvm/v0.34.0/install.sh -o
   && npm set unsafe-perm true
 ENV NODE_PATH=${NVM_DIR}/versions/node/v${NODE_VERSION}/lib/node_modules                                                \
     PATH=${PATH}:${NVM_DIR}/versions/node/v${NODE_VERSION}/bin
-# Install .NET Core
+# Install .NET Core & mono
 ENV DOTNET_CLI_TELEMETRY_OPTOUT=1                                                                                       \
     DOTNET_SKIP_FIRST_TIME_EXPERIENCE=1
-RUN rpm -Uvh https://packages.microsoft.com/config/rhel/7/packages-microsoft-prod.rpm                                   \
-  && yum -y install dotnet-sdk-2.2                                                                                      \
+COPY gpg/mono.asc /tmp/mono.asc
+RUN rpm --import "https://packages.microsoft.com/keys/microsoft.asc"                                                    \
+  && rpm -Uvh "https://packages.microsoft.com/config/rhel/7/packages-microsoft-prod.rpm"                                \
+  && rpm --import /tmp/mono.asc && rm -f /tmp/mono.asc                                                                  \
+  && curl "https://download.mono-project.com/repo/centos6-stable.repo" | tee /etc/yum.repos.d/mono-centos6-stable.repo  \
+  && yum -y install dotnet-sdk-2.2 mono-devel                                                                           \
   && yum clean all && rm -rf /var/cache/yum
 
 # Install Powershell
@@ -63,6 +67,8 @@ VOLUME /var/lib/docker
 # Install some configuration
 COPY ssh_config /root/.ssh/config
 COPY dockerd-entrypoint.sh /usr/local/bin/
+ENV CHARSET=UTF-8                                                                                                       \
+    LC_ALL=C.UTF-8
 
 ## Image Metadata
 ARG BUILD_TIMESTAMP

superchain/README.md

@@ -10,7 +10,7 @@ required in order to package [jsii] projects in all supported languages.
 SDK             | Version
 ----------------|-------------------------------------------
 `OpenJDK 8`     | Amazon Corretto `>= 8.222.10.2`
-`.NET Core`     | `>= 2.2.301`
+`.NET Core`     | `>= 2.2.301` and `mono >= 6.0.0.319`
 `Javascript`    | `node >= 8.16.0` with `npm >= 6.8.0`
 `PowerShell`    | `pwsh >= 6.2.2`
 `Python 3`      | `python3 >= 3.7.3` with `pip3 >= 19.1.1`

superchain/gpg/mono.asc

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