Add a test to check if ruby_binary can run in a container

Author: yugui

WORKSPACE

@@ -54,3 +54,35 @@ gazelle_dependencies()
 load("@com_google_protobuf//:protobuf_deps.bzl", "protobuf_deps")
 
 protobuf_deps()
+
+# rules_docker
+
+http_archive(
+    name = "io_bazel_rules_docker",
+    sha256 = "14ac30773fdb393ddec90e158c9ec7ebb3f8a4fd533ec2abbfd8789ad81a284b",
+    strip_prefix = "rules_docker-0.12.1",
+    urls = ["https://github.com/bazelbuild/rules_docker/releases/download/v0.12.1/rules_docker-v0.12.1.tar.gz"],
+)
+
+load(
+    "@io_bazel_rules_docker//repositories:repositories.bzl",
+    container_repositories = "repositories",
+)
+
+container_repositories()
+
+load("@io_bazel_rules_docker//repositories:deps.bzl", container_deps = "deps")
+
+container_deps()
+
+load(
+    "@io_bazel_rules_docker//container:container.bzl",
+    "container_pull",
+)
+
+container_pull(
+    name = "ruby_base_container",
+    digest = "sha256:da560e130d6a4b75b099e932a98331ec3b2420b914d51a88edc4fe3c60aee9b1",  # alpine linux/amd64
+    registry = "docker.io",
+    repository = "library/ruby",
+)

ruby/tests/BUILD.bazel

@@ -3,6 +3,8 @@ load(
     "ruby_binary",
     "ruby_test",
 )
+load("@bazel_tools//tools/build_defs/pkg:pkg.bzl", "pkg_tar")
+load("@io_bazel_rules_docker//container:container.bzl", "container_image")
 
 # Checks if args are correctly passed to the ruby script.
 ruby_test(
@@ -69,13 +71,13 @@ genrule(
         "echo '#!/bin/sh -e' > $@",
         "echo true >> $@",
     ]),
+    message = "Running ruby_bin in genrule",
     output_to_bindir = 1,
     tools = [
         "args_check.rb",
         "@org_ruby_lang_ruby_host//:ruby_bin",
         "@org_ruby_lang_ruby_host//:runtime",
     ],
-    message = "Running ruby_bin in genrule",
 )
 
 sh_test(
@@ -154,15 +156,15 @@ sh_test(
 
 genrule(
     name = "dummy_genfile_load_path_in_runfiles",
-    message = "Running :load_path_in_runfiles in genrule",
     outs = ["load_path_in_runfiles_test_5a.sh"],
-    tools = [":load_path_in_runfiles"],
     cmd = " && ".join([
         "$(location :load_path_in_runfiles)",
         "echo '#!/bin/sh -e' > $@",
         "echo 'true' >> $@",
     ]),
     executable = True,
+    message = "Running :load_path_in_runfiles in genrule",
+    tools = [":load_path_in_runfiles"],
 )
 
 # TODO(yugui) Add a test for case 6a.
@@ -225,3 +227,40 @@ ruby_test(
     }),
     main = "ext_test.rb",
 )
+
+## Containerization test
+
+# TODO(yugui) Make it easier to build a tar with the right runfiles structure
+pkg_tar(
+    name = "load_path_in_runfiles_container_layer",
+    srcs = [":load_path_in_runfiles"],
+    include_runfiles = True,
+    package_dir = "/app",
+    remap_paths = {
+        "ruby": "load_path_in_runfiles.runfiles/bazelruby_ruby_rules/ruby",
+        ".": "load_path_in_runfiles.runfiles/",
+    },
+    strip_prefix = "dummy",
+    symlinks = {
+        "/app/load_path_in_runfiles.runfiles/bazelruby_ruby_rules/external": "/app/load_path_in_runfiles.runfiles",
+        "/app/load_path_in_runfiles": "/app/load_path_in_runfiles.runfiles/bazelruby_ruby_rules/ruby/tests/load_path_in_runfiles",
+    },
+)
+
+container_image(
+    name = "load_path_in_runfiles_container_image",
+    base = "@ruby_base_container//image",
+    entrypoint = ["/app/load_path_in_runfiles"],
+    tars = [":load_path_in_runfiles_container_layer"],
+)
+
+sh_test(
+    name = "load_path_in_runfiles_container_test",
+    srcs = ["container_test.sh"],
+    args = [
+        "$(location :load_path_in_runfiles_container_image)",
+        "bazel/ruby/tests:load_path_in_runfiles_container_image",
+    ],
+    data = [":load_path_in_runfiles_container_image"],
+    tags = ["docker"],
+)

ruby/tests/container_test.sh

@@ -0,0 +1,12 @@
+#!/bin/sh -eu
+
+if [ $# -lt 2 ]; then
+  echo "Usage: $0 CONTAINER_IMAGE_LOADER CONTAINER_IMAGE_NAME" >&2
+  exit 1
+fi
+
+CONTAINER_IMAGE_LOADER=$1
+CONTAINER_IMAGE_NAME=$2
+
+$CONTAINER_IMAGE_LOADER
+docker run $CONTAINER_IMAGE_NAME