core -> metropolis

Smalltown is now called Metropolis!

This is the first commit in a series of cleanup commits that prepare us
for an open source release. This one just some Bazel packages around to
follow a stricter directory layout.

All of Metropolis now lives in `//metropolis`.

All of Metropolis Node code now lives in `//metropolis/node`.

All of the main /init now lives in `//m/n/core`.

All of the Kubernetes functionality/glue now lives in `//m/n/kubernetes`.

Next steps:
     - hunt down all references to Smalltown and replace them appropriately
     - narrow down visibility rules
     - document new code organization
     - move `//build/toolchain` to `//monogon/build/toolchain`
     - do another cleanup pass between `//golibs` and
       `//monogon/node/{core,common}`.
     - remove `//delta` and `//anubis`

Fixes T799.

Test Plan: Just a very large refactor. CI should help us out here.

Bug: T799

X-Origin-Diff: phab/D667
GitOrigin-RevId: 6029b8d4edc42325d50042596b639e8b122d0ded
diff --git a/metropolis/node/build/genosrelease/defs.bzl b/metropolis/node/build/genosrelease/defs.bzl
new file mode 100644
index 0000000..61ce9e4
--- /dev/null
+++ b/metropolis/node/build/genosrelease/defs.bzl
@@ -0,0 +1,54 @@
+#  Copyright 2020 The Monogon Project Authors.
+#
+#  SPDX-License-Identifier: Apache-2.0
+#
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+
+def _os_release_impl(ctx):
+    ctx.actions.run(
+        mnemonic = "GenOSRelease",
+        progress_message = "Generating os-release",
+        inputs = [ctx.info_file],
+        outputs = [ctx.outputs.out],
+        executable = ctx.executable._genosrelease,
+        arguments = [
+            "-status_file",
+            ctx.info_file.path,
+            "-out_file",
+            ctx.outputs.out.path,
+            "-stamp_var",
+            ctx.attr.stamp_var,
+            "-name",
+            ctx.attr.os_name,
+            "-id",
+            ctx.attr.os_id,
+        ],
+    )
+
+os_release = rule(
+    implementation = _os_release_impl,
+    attrs = {
+        "os_name": attr.string(mandatory = True),
+        "os_id": attr.string(mandatory = True),
+        "stamp_var": attr.string(mandatory = True),
+        "_genosrelease": attr.label(
+            default = Label("//metropolis/node/build/genosrelease"),
+            cfg = "host",
+            executable = True,
+            allow_files = True,
+        ),
+    },
+    outputs = {
+        "out": "os-release",
+    },
+)