Try #878: --target cross

Author: bors[bot]

.github/workflows/ci.yml

@@ -204,6 +204,7 @@ jobs:
             - { target: thumbv7em-none-eabi,              os: ubuntu-latest,                    std: 1 }
             - { target: thumbv7em-none-eabihf,            os: ubuntu-latest,                    std: 1 }
             - { target: thumbv7m-none-eabi,               os: ubuntu-latest,                    std: 1 }
+            - { target: cross,                            os: ubuntu-latest }
 
   build:
     name: target (${{ matrix.pretty }},${{ matrix.os }})

CHANGELOG.md

@@ -7,6 +7,10 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased] - ReleaseDate
 
+### Added
+
+- #878 - added a dockerfile containing cross.
+
 ### Changed
 
 - #869 - ensure cargo configuration environment variable flags are passed to the docker container.

ci/test.sh

@@ -8,6 +8,10 @@ set -euo pipefail
 # installed version on macOS. likewise, "${var[@]}" is an unbound
 # error if var is an empty array.
 
+if [[ "${TARGET}" == "cross" ]]; then
+    exit 0
+fi
+
 function retry {
   local tries="${TRIES-5}"
   local timeout="${TIMEOUT-1}"

docker/Dockerfile.cross

@@ -0,0 +1,11 @@
+FROM docker:20.10-dind
+
+RUN apk add curl bash libgcc gcc musl-dev git
+
+RUN curl --proto "=https" --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y
+# need to ensure cargo is in the path when we run this command,
+# since we won't be sourcing the profile.
+RUN PATH="$HOME/.cargo/bin:$PATH" cargo install cross --git https://github.com/cross-rs/cross --locked
+
+COPY cross-entry.sh /
+ENTRYPOINT ["/cross-entry.sh"]

docker/cross-entry.sh

@@ -0,0 +1,7 @@
+#!/usr/bin/env bash
+
+# shellcheck disable=SC1090
+. ~/.cargo/env
+export CROSS_CONTAINER_IN_CONTAINER=1
+
+exec "${@}"

docker/cross.sh

@@ -0,0 +1,14 @@
+#!/usr/bin/env bash
+
+main() {
+    apk add gcc curl musl-dev
+
+    curl --proto "=https" --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y
+    PATH="$HOME/.cargo/bin:$PATH" cargo install cross --git https://github.com/cross-rs/cross --locked
+
+    apk del gcc curl musl-dev
+
+    rm -rf "${0}"
+}
+
+main "${@}"