Add a platform portability blog post

Also fixes the docker_image bazel rule, and website-server make target.

Fixes #3273

PiperOrigin-RevId: 338606668

1 files changed, 10 insertions, 7 deletions

diff --git a/images/defs.bzl b/images/defs.bzl
index 61d7bbf73..c1f96e312 100644
--- a/images/defs.bzl
+++ b/images/defs.bzl
@@ -2,30 +2,33 @@
 
 def _docker_image_impl(ctx):
     importer = ctx.actions.declare_file(ctx.label.name)
+
     importer_content = [
         "#!/bin/bash",
         "set -euo pipefail",
+        "source_file='%s'" % ctx.file.data.path,
+        "if [[ ! -f \"$source_file\" ]]; then",
+        "  source_file='%s'" % ctx.file.data.short_path,
+        "fi",
         "exec docker import " + " ".join([
             "-c '%s'" % attr
             for attr in ctx.attr.statements
-        ]) + " " + " ".join([
-            "'%s'" % f.path
-            for f in ctx.files.data
-        ]) + " $1",
+        ]) + " \"$source_file\" $1",
         "",
     ]
+
     ctx.actions.write(importer, "\n".join(importer_content), is_executable = True)
     return [DefaultInfo(
-        runfiles = ctx.runfiles(ctx.files.data),
+        runfiles = ctx.runfiles([ctx.file.data]),
         executable = importer,
     )]
 
 docker_image = rule(
     implementation = _docker_image_impl,
-    doc = "Tool to load a Docker image; takes a single parameter (image name).",
+    doc = "Tool to import a Docker image; takes a single parameter (image name).",
     attrs = {
         "statements": attr.string_list(doc = "Extra Dockerfile directives."),
-        "data": attr.label_list(doc = "All image data."),
+        "data": attr.label(doc = "Image filesystem tarball", allow_single_file = [".tgz", ".tar.gz"]),
     },
     executable = True,
 )