[libvirt-ci PATCH] containers: add a standard container for running cargo fmt

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The "cargo fmt" code style checking tool is something we wish to run on all
Rust code, so it is useful to have a common container that can be used by
all relevant projects.

Signed-off-by: Daniel P. Berrangé <berrange@xxxxxxxxxx>
---
 .gitlab-ci.yml                    |  5 +++++
 containers/cargo-fmt/Dockerfile   | 11 +++++++++++
 containers/cargo-fmt/README.rst   | 20 ++++++++++++++++++++
 containers/cargo-fmt/cargo-fmt.sh | 22 ++++++++++++++++++++++
 4 files changed, 58 insertions(+)
 create mode 100644 containers/cargo-fmt/Dockerfile
 create mode 100644 containers/cargo-fmt/README.rst
 create mode 100755 containers/cargo-fmt/cargo-fmt.sh

diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 080c8d1..e5f121f 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -27,6 +27,11 @@ go-fmt-container:
   variables:
     NAME: go-fmt
 
+cargo-fmt-container:
+  <<: *build_container_definition
+  variables:
+    NAME: cargo-fmt
+
 # Check that all commits are signed-off for the DCO. Skip
 # on master branch and -maint branches, since we only need
 # to test developer's personal branches.
diff --git a/containers/cargo-fmt/Dockerfile b/containers/cargo-fmt/Dockerfile
new file mode 100644
index 0000000..0ed1c46
--- /dev/null
+++ b/containers/cargo-fmt/Dockerfile
@@ -0,0 +1,11 @@
+FROM rust:1.43
+
+RUN export DEBIAN_FRONTEND=noninteractive && \
+    apt-get update && \
+    apt-get install --no-install-recommends -y \
+            diffstat && \
+    apt-get autoclean -y
+
+RUN rustup component add rustfmt
+
+COPY cargo-fmt.sh /cargo-fmt
diff --git a/containers/cargo-fmt/README.rst b/containers/cargo-fmt/README.rst
new file mode 100644
index 0000000..00f50a2
--- /dev/null
+++ b/containers/cargo-fmt/README.rst
@@ -0,0 +1,20 @@
+================================================
+Container for running cargo fmt code style check
+================================================
+
+This container provides a simple way to invoke ``cargo fmt`` to validate code
+style across a Rust codebase. It should be integrated into CI by adding
+the following snippet to ``.gitlab-ci.yml``
+
+::
+
+   cargo-fmt:
+     stage: prebuild
+     image: registry.gitlab.com/libvirt/libvirt-ci/cargo-fmt:master
+     script:
+       - /cargo-fmt
+     artifacts:
+       paths:
+         - cargo-fmt.patch
+       expire_in: 1 week
+       when: on_failure
diff --git a/containers/cargo-fmt/cargo-fmt.sh b/containers/cargo-fmt/cargo-fmt.sh
new file mode 100755
index 0000000..53fb0df
--- /dev/null
+++ b/containers/cargo-fmt/cargo-fmt.sh
@@ -0,0 +1,22 @@
+#!/bin/sh
+
+cargo fmt -v -- --check > cargo-fmt.patch
+
+if test -s cargo-fmt.patch
+then
+    echo
+    echo "❌ ERROR: some files failed cargo fmt code style check"
+    echo
+    diffstat cargo-fmt.patch
+    echo
+    echo "See the cargo-fmt patch artifact for full details of mistakes."
+    echo
+    echo "For guidance on how to configure Emacs or Vim to automatically"
+    echo "run cargo fmt when saving files read"
+    echo
+    echo "     https://github.com/rust-lang/rustfmt";
+    echo
+    exit 1
+fi
+
+echo "✔ OK: all files passed cargo fmt code style check"
-- 
2.26.2




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