This partially reverts CL 229559, while adjusting it to use a new
builder. The builder will be used now for windows/arm and later for
windows/arm64.

Updates golang/go#42604.
Updates golang/go#38607.
Updates golang/go#36439.

Change-Id: I1ab661a6585e64de8196955c077715b32dc732b8
Reviewed-on: https://go-review.googlesource.com/c/build/+/272106
Run-TryBot: Jason A. Donenfeld <Jason@zx2c4.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Trust: Alex Brainman <alex.brainman@gmail.com>
Trust: Jason A. Donenfeld <Jason@zx2c4.com>

The windows/arm64 port has been completed in golang.org/issue/36439
recently. Add pre-submit compile-only coverage via a misc-compile
TryBot for the new port. It can be upgraded to a normal TryBot that
also executes tests after a windows/arm64 builder becomes available.

Tested locally by running 'buildall.bash windows-arm64' on a recent
Go tip commit (CL 313849), which passed.

For golang/go#36439.
Updates golang/go#42604.

Change-Id: Ie4988a876aa18392a583eb407c6c3621eb30a4f8
Reviewed-on: https://go-review.googlesource.com/c/build/+/314430
Trust: Dmitri Shuralyov <dmitshur@golang.org>
Trust: Alexander Rakoczy <alex@golang.org>
Reviewed-by: Carlos Amedee <carlos@golang.org>
Reviewed-by: Heschi Kreinick <heschi@google.com>
Reviewed-by: Alexander Rakoczy <alex@golang.org>

Updates #44513, #42604.

Change-Id: I8200e8087c219a0042ab2a6770a7275c3b17942a
Reviewed-on: https://go-review.googlesource.com/c/go/+/321309
Trust: Cherry Mui <cherryyz@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>

This change introduces a Windows ARM64 builder image for Go, running on
Ubuntu on an a1.metal instance on AWS.

The AMI image successfully boots, and automatically starts a Windows
ARM64 VM, exposing port 443. The buildlet still needs to be updated for
the appropriate mingw path. Additionally, the qemu script does not
yet automatically halt the instance on termination, which makes
debugging easier.

- Ubuntu was chosen over Debian, as the official Debian AMI would not
boot on a1.metal instances.
- a1.metal is the most affordable AWS instance to support KVM on ARM64.
- A prepared qemu image exists in the Go AWS account, under
s3://go-builder-data.
- Only 4 processors are currently supported in order to avoid a
CLOCK_WATCHDOG_TIMEOUT. We're working on investigating how to increase
this.
- The EC2 metadata service is proxied to the guest OS via qemu.

For golang/go#42604

Change-Id: I2a505a8218c2a818f0e52d179c02e6d264d2e422
Reviewed-on: https://go-review.googlesource.com/c/build/+/321959
Trust: Alexander Rakoczy <alex@golang.org>
Run-TryBot: Alexander Rakoczy <alex@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Carlos Amedee <carlos@golang.org>

The a1.metal instances take about four minutes to become available
before beginning to boot the Windows ARM64 VM. This means we need
somewhere between five and ten minutes before we can first connect to
the buildlet.

It's possible that other instances are faster to boot, but this is
currently the most economical choice.

For golang/go#42604

Change-Id: Ib76944307c9ad28fd1adca0dc54f3fbeaabfffa0
Reviewed-on: https://go-review.googlesource.com/c/build/+/322654
Trust: Alexander Rakoczy <alex@golang.org>
Run-TryBot: Alexander Rakoczy <alex@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Carlos Amedee <carlos@golang.org>

This change allows the ledger to track how many a1.metal instances
have either been created or are in the process of being created. A
hard limit of 1 has been set for a1.metal limits while testing is
being performed.

For golang/go#42604

Change-Id: I5bcb3a65407af07d225caf2884877ce040ee011b
Reviewed-on: https://go-review.googlesource.com/c/build/+/322855
Trust: Carlos Amedee <carlos@golang.org>
Run-TryBot: Carlos Amedee <carlos@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Alexander Rakoczy <alex@golang.org>

a1.metal instances have 32Gb of ram, and 16 cores. We should try to use
as much as possible.

We run into CLOCK_WATCHDOG_TIMEOUT when using more than 4 of the 16
cores. The VM can also fail to boot. We have a thread discussing how to
resolve this.

A new AMI will need to be created and configured after any changes to
this script.

For golang/go#42604

Change-Id: If49b89718fca6dc5cee30e609a8ded9f99bf1f05
Reviewed-on: https://go-review.googlesource.com/c/build/+/322655
Trust: Alexander Rakoczy <alex@golang.org>
Run-TryBot: Alexander Rakoczy <alex@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Carlos Amedee <carlos@golang.org>

Add the windows-arm64 builder to the dashboard and coordinator with a
known issue until we can verify builds are succeeding regularly.

Also, tweak the logic around validating ec2 configurations. The arm64
buildlet sets VMImage but not ContainerImage, unlike other ec2
buildlets. This should work for both.

For golang/go#42604

Change-Id: I7176b8f6bba837830a0565e7713c9e9a0eb76e90
Reviewed-on: https://go-review.googlesource.com/c/build/+/322656
Trust: Alexander Rakoczy <alex@golang.org>
Run-TryBot: Alexander Rakoczy <alex@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Carlos Amedee <carlos@golang.org>

This adds a reverse buildlet for Windows ARM64 running under qemu on M1
Mac Minis. The VM currently boots, but more changes are needed to
stage0 and buildlet in order for the builder to run.

For golang/go#42604.

Change-Id: Ie86e596c0f166d2ca8c075c0c971fcd1e34e940f
Reviewed-on: https://go-review.googlesource.com/c/build/+/328311
Trust: Alexander Rakoczy <alex@golang.org>
Run-TryBot: Alexander Rakoczy <alex@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Heschi Kreinick <heschi@google.com>
Reviewed-by: Carlos Amedee <carlos@golang.org>

The Windows ARM64 VM should exit upon build completion. Afterwards, we
should try to terminate our instance. The coordinator will clean it up
soon anyway.

For golang/go#42604

Change-Id: Ib7b6adbe293d8ea9e54c8288de9f10c6a45ebeb3
Reviewed-on: https://go-review.googlesource.com/c/build/+/322657
Trust: Alexander Rakoczy <alex@golang.org>
Run-TryBot: Alexander Rakoczy <alex@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Carlos Amedee <carlos@golang.org>

This change makes room for a race between the main function exiting, and
the delay built into our halting process when shutting down a reverse
dialer.

Ideally, there would be no race, but plumbing the shutdown signal
through is a separate significant effort.

For golang/go#42604

Change-Id: I0762cb71eac50bcda7f0cd571e04396e98bff699
Reviewed-on: https://go-review.googlesource.com/c/build/+/331669
Trust: Alexander Rakoczy <alex@golang.org>
Run-TryBot: Alexander Rakoczy <alex@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Carlos Amedee <carlos@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>

This change removes the windows-arm64-aws buildlet and replaces all
usages with the windows-arm64-10 buildlet.

- Remove the known issue from the windows-arm64-10 buildlet, which has
been passing reliably.
- Enable tests during releases, and add a slowbot alias, as it's a much
faster buildlet.

Updates golang/go#46502
For golang/go#42604

Change-Id: Ib9f7c3d5391b01e303b43bbdad030b3f94147c5d
Reviewed-on: https://go-review.googlesource.com/c/build/+/331670
Trust: Alexander Rakoczy <alex@golang.org>
Run-TryBot: Alexander Rakoczy <alex@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Carlos Amedee <carlos@golang.org>

This will make the dashboard view more consistent.

For golang/go#42604

Change-Id: I90991c9e6c7ba5fc781c6ea1259593048156ca79
Reviewed-on: https://go-review.googlesource.com/c/build/+/333076
Trust: Alexander Rakoczy <alex@golang.org>
Run-TryBot: Alexander Rakoczy <alex@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Carlos Amedee <carlos@golang.org>

The Windows ARM64 builders on Azure have replaced the Windows ARM64
builders on AWS by now. Remove unused environment configuration; we
can bring it back or look it up in history if needed.

Updates golang/go#53541.
Updates golang/go#42604.
Updates golang/go#57408.

Change-Id: I080e4f5c53712c0470332a7d26d00c939136e57c
Reviewed-on: https://go-review.googlesource.com/c/build/+/462655
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Heschi Kreinick <heschi@google.com>
Reviewed-by: Carlos Amedee <carlos@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>