Install preflight binary on Linux machines

Adding preflight to the list of OpenShift binaries installed. For now,
this is only available on Linux machines and won't be added to anyone
using Darwin.

Author: pseudomuto

hack/bin/BUILD.bazel

@@ -38,6 +38,16 @@ genrule(
     visibility = ["//visibility:public"],
 )
 
+genrule(
+    name = "fetch_preflight",
+    srcs = select({
+        ":k8": ["@preflight_linux//file"],
+    }),
+    outs = ["preflight"],
+    cmd = "cp $(SRCS) $@",
+    visibility = ["//visibility:public"],
+)
+
 genrule(
     name = "fetch_faq",
     srcs = select({

hack/bin/deps.bzl

@@ -22,6 +22,13 @@ OPENSHIFT_REPO = "https://mirror.openshift.com/pub/openshift-v4/x86_64/clients/o
 
 # filenames and versions from ${OPENSHIFT_REPO}/sha256sum.txt
 OPENSHIFT_BINS = {
+    "preflight": {
+        # currently, preflight is only available on linux
+        "preflight_linux": {
+            "url": "https://github.com/redhat-openshift-ecosystem/openshift-preflight/releases/download/1.2.1/preflight-linux-amd64",
+            "sha": "e5754a81d4baae4f4956fc0842179a3daeac4778e202450f886a9afb05d218ba",
+        },
+    },
     "oc": {
         "oc_darwin": {
             "url": "{}/openshift-client-mac-{}.tar.gz".format(OPENSHIFT_REPO, OPENSHIFT_VERSION),
@@ -71,6 +78,7 @@ def install():
     install_operator_sdk()
     install_opm()
     install_openshift()
+    install_preflight()
 
     # Install golang.org/x/build as kubernetes/repo-infra requires it for the
     # build-tar bazel target.
@@ -413,6 +421,17 @@ filegroup(
 """
       )
 
+def install_preflight():
+    versions = OPENSHIFT_BINS["preflight"]
+
+    for k, v in versions.items():
+        http_file(
+            name = k,
+            executable = 1,
+            sha256 = v["sha"],
+            urls = [v["url"]]
+        )
+
 ## Fetch crdb used in our container
 def install_crdb():
     http_archive(

pkg/resource/BUILD.bazel

@@ -57,8 +57,8 @@ go_library(
 go_test(
     name = "go_default_test",
     srcs = [
-        "cluster_test.go",
         "certificate_test.go",
+        "cluster_test.go",
         "discovery_service_test.go",
         "pod_distruption_budget_test.go",
         "public_service_test.go",