diff --git a/gokrazy/.gitignore b/gokrazy/.gitignore
new file mode 100644
index 000000000..cdd044ae2
--- /dev/null
+++ b/gokrazy/.gitignore
@@ -0,0 +1,2 @@
+tsapp.img
+go.work
diff --git a/gokrazy/Makefile b/gokrazy/Makefile
new file mode 100644
index 000000000..f086dd26b
--- /dev/null
+++ b/gokrazy/Makefile
@@ -0,0 +1,8 @@
+help:
+	echo "See Makefile"
+
+image:
+	go run build.go --build
+
+qemu: image
+	qemu-system-x86_64 -m 1G -drive file=tsapp.img,format=raw -boot d -netdev user,id=user.0 -device virtio-net-pci,netdev=user.0 -serial mon:stdio -audio none
diff --git a/gokrazy/README.md b/gokrazy/README.md
new file mode 100644
index 000000000..af41ad62a
--- /dev/null
+++ b/gokrazy/README.md
@@ -0,0 +1,76 @@
+# Tailscale Appliance Gokrazy Image
+
+This is (as of 2024-06-02) a **WORK IN PROGRESS** (pre-alpha) experiment to
+package Tailscale as a [Gokrazy](https://gokrazy.org/) appliance image
+for use on both VMs (AWS, GCP, Azure, Proxmox, ...) and Rasperry Pis.
+
+See https://github.com/tailscale/tailscale/issues/1866
+
+## Overview
+
+It makes a ~70MB image (about the same size as
+`tailscale-setup-full-1.66.4.exe` and smaller than the combined
+Tailscale Android APK) that combines the Linux kernel and Tailscale
+and that's it. Nothing written in C. (except optional busybox for
+debugging) So no operating system to maintain. Gokrazy has three
+partitions: two read-only ones (one active at a time, the other for
+updates for the next boot) and one optional stateful, writable
+partition that survives upgrades (`/perm/`)
+
+Initial bootstrap configuration of this appliance will be over either
+serial or configuration files (auth keys, subnet routes, etc) baked into
+the image (for Raspberry Pis) or in cloud-init/user-data (for AWS, etc).
+As of 2024-06-02, AWS user-data config files work.
+
+## Quick start
+
+Install dependencies:
+```
+$ brew install qemu e2fsprogs
+```
+
+Build + launch:
+```
+$ make qemu
+```
+
+That puts serial on stdio. To exit the serial console and escape to
+the qemu monitor, type `Ctrl-a c`. Then type `quit` in the monitor to
+quit.
+
+## Building
+
+`make image` to build just the image (`tsapp.img`), without uploading it.
+
+## UTM
+
+You can also use UTM, but the qemu path above is easier.
+For UTM, see the [UTM instructions](UTM.md).
+
+## AWS
+
+### Build an AMI
+
+`go run build.go --bucket=your-S3-temp-bucket` to build an AMI. Make
+sure your "aws" command is in your path and has access.
+
+### Creating an instance
+
+When creating an instance, you need a Nitro machine type to get a
+virtual serial console. Notably, that means the `t2.*` instance types
+that AWS pushes as a free option are not new enough. Use `t3.*` at least.
+
+As of 2024-06-02 this builder tool only supports x86_64 (arm64 should
+be trivial and will come soon), so don't use a Graviton machine type.
+
+To connect to the serial console, you can either use the web console, or
+use the CLI like:
+
+```
+$ aws ec2-instance-connect send-serial-console-ssh-public-key --instance-id i-0b4a0eabc43629f13 --serial-port 0 --ssh-public-key file:///your/home/.ssh/id_ed25519.pub --region us-west-2
+{
+    "RequestId": "a93b0ea3-9ff9-45d5-b8ed-b1e70ccc0410",
+    "Success": true
+}
+$ ssh i-0b4a0eabc43629f13.port0@serial-console.ec2-instance-connect.us-west-2.aws 
+```
diff --git a/gokrazy/UTM.md b/gokrazy/UTM.md
new file mode 100644
index 000000000..9348afd6a
--- /dev/null
+++ b/gokrazy/UTM.md
@@ -0,0 +1,50 @@
+# tsapp on UTM
+
+qemu from homebrew is recommended for tsapp development.
+See the [main README](README.md) for details.
+
+If you don't want to use qemu, this documents a way to use UTM on
+macOS for tsapp development. It's not as quick of an edit-run-test
+iteration cycle, but this is how:
+
+* Create new VM, choose "Emulate" (for now) and not "Virtualize"
+* Pick "Linux" as the operating system
+* For "Boot ISO Image", select the built `tsapp.img`
+* Architecture: `x86_64` (for now; arm64 later)
+* System: `Standard PC (...) (q35)`
+* Memory: 1024 MB is fine for testing
+* CPUs: Default
+* Storage size: 3GB
+* Shared Directory: none. Continue.
+* Summary: check "Open VM Settings"
+* Network: Emulated Network Card: `virtio-net-pci`
+* Display: Emulated Display Card: `virtio-vga` (not that there's much to see)
+* Drives: delete all disks
+* Drives: New... Interface `VirtIO`, Import ... find `tsapp.img` again. Save.
+* Devices: New... Serial. Mode: Psuedo-TTY Device, Target: Automatic Serial Device.
+
+Once created & the `img` is imported once, UTM converts it to qcow2 format
+under `$HOME/Library/Containers/com.utmapp.UTM/Data/Documents/Tsapp.utm/Data/tsapp.qcow2`.
+
+To update it, stop the VM, then:
+
+```
+qemu-img convert -f raw -O qcow2 tsapp.img tsapp.qcow2 && \
+  mv tsapp.qcow2 $HOME/Library/Containers/com.utmapp.UTM/Data/Documents/Tsapp.utm/Data/tsapp.qcow2
+```
+
+To attach to its serial:
+
+```
+% /Applications/UTM.app/Contents/MacOS/utmctl list
+UUID                                 Status   Name
+C0DE927B-F426-4ABA-A6E7-E30AA429371F started  Tsapp
+
+% % /Applications/UTM.app/Contents/MacOS/utmctl attach C0DE927B-F426-4ABA-A6E7-E30AA429371F
+WARNING: attach command is not implemented yet!
+PTTY: /dev/ttys017
+
+% screen /dev/ttys017
+```
+
+(Then `Ctrl-a K` to kill screen session)
diff --git a/gokrazy/build.go b/gokrazy/build.go
new file mode 100644
index 000000000..9bfe26d25
--- /dev/null
+++ b/gokrazy/build.go
@@ -0,0 +1,274 @@
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
+
+// This program builds the Tailscale Appliance Gokrazy image.
+//
+// As of 2024-06-02 this is a exploratory work in progress and is
+// not intended for serious use.
+//
+// Tracking issue is https://github.com/tailscale/tailscale/issues/1866
+package main
+
+import (
+	"bytes"
+	"encoding/json"
+	"errors"
+	"flag"
+	"fmt"
+	"io"
+	"log"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"regexp"
+	"runtime"
+	"time"
+)
+
+var (
+	bucket = flag.String("bucket", "tskrazy-import", "S3 bucket to upload disk image to while making AMI")
+	build  = flag.Bool("build", false, "if true, just build locally and stop, without uploading")
+)
+
+func findMkfsExt4() (string, error) {
+	tries := []string{
+		"/opt/homebrew/opt/e2fsprogs/sbin/mkfs.ext4",
+		"/sbin/mkfs.ext4",
+	}
+	for _, p := range tries {
+		if _, err := os.Stat(p); err == nil {
+			return p, nil
+		}
+	}
+	p, err := exec.LookPath("mkfs.ext4")
+	if err == nil {
+		return p, nil
+	}
+	if runtime.GOOS == "darwin" {
+		return "", errors.New("no mkfs.ext4 found; run `brew install e2fsprogs`")
+	}
+	return "", errors.New("No mkfs.ext4 found on system")
+}
+
+func main() {
+	flag.Parse()
+
+	if err := buildImage(); err != nil {
+		log.Fatalf("build image: %v", err)
+	}
+	if *build {
+		log.Printf("built. stopping.")
+		return
+	}
+
+	if err := copyToS3(); err != nil {
+		log.Fatalf("copy to S3: %v", err)
+	}
+
+	importTask, err := startImportSnapshot()
+	if err != nil {
+		log.Fatalf("start import snapshot: %v", err)
+	}
+	snapID, err := waitForImportSnapshot(importTask)
+	if err != nil {
+		log.Fatalf("waitForImportSnapshot(%v): %v", importTask, err)
+	}
+	log.Printf("snap ID: %v", snapID)
+
+	ami, err := makeAMI(fmt.Sprintf("tsapp-%d", time.Now().Unix()), snapID)
+	if err != nil {
+		log.Fatalf("makeAMI: %v", err)
+	}
+	log.Printf("made AMI: %v", ami)
+}
+
+func buildImage() error {
+	mkfs, err := findMkfsExt4()
+	if err != nil {
+		return err
+	}
+
+	dir, err := os.Getwd()
+	if err != nil {
+		return err
+	}
+	if fi, err := os.Stat(filepath.Join(dir, "tsapp")); err != nil || !fi.IsDir() {
+		return fmt.Errorf("in wrong directorg %v; no tsapp subdirectory found", dir)
+	}
+	// Build the tsapp.img
+	var buf bytes.Buffer
+	cmd := exec.Command("go", "run",
+		"-exec=env GOOS=linux GOARCH=amd64 ",
+		"github.com/gokrazy/tools/cmd/gok",
+		"--parent_dir="+dir,
+		"--instance=tsapp",
+		"overwrite",
+		"--full", "tsapp.img",
+		"--target_storage_bytes=1258299392")
+	cmd.Stdout = io.MultiWriter(os.Stdout, &buf)
+	cmd.Stderr = os.Stderr
+	if err := cmd.Run(); err != nil {
+		return err
+	}
+
+	// gok overwrite emits a line of text saying how to run mkfs.ext4
+	// to create the ext4 /perm filesystem. Parse that and run it.
+	// The regexp is tight to avoid matching if the command changes,
+	// to force us to check it's still correct/safe. But it shouldn't
+	// change on its own because we pin the gok version in our go.mod.
+	//
+	// TODO(bradfitz): emit this in a machine-readable way from gok.
+	rx := regexp.MustCompile(`(?m)/mkfs.ext4 (-F) (-E) (offset=\d+) (\S+) (\d+)\s*?$`)
+	m := rx.FindStringSubmatch(buf.String())
+	if m == nil {
+		return fmt.Errorf("found no ext4 instructions in output")
+	}
+
+	log.Printf("Running %s %q ...", mkfs, m[1:])
+	out, err := exec.Command(mkfs, m[1:]...).CombinedOutput()
+	if err != nil {
+		return fmt.Errorf("error running %v: %v, %s", mkfs, err, out)
+	}
+	log.Printf("Success.")
+
+	return nil
+}
+
+func copyToS3() error {
+	cmd := exec.Command("aws", "s3", "cp", "tsapp.img", "s3://"+*bucket+"/")
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+	return cmd.Run()
+}
+
+func startImportSnapshot() (importTaskID string, err error) {
+	out, err := exec.Command("aws", "ec2", "import-snapshot", "--disk-container", "Url=s3://"+*bucket+"/tsappp.img").CombinedOutput()
+	if err != nil {
+		return "", fmt.Errorf("import snapshot: %v: %s", err, out)
+	}
+	var resp struct {
+		ImportTaskID string `json:"ImportTaskId"`
+	}
+	/*
+		{
+			"ImportTaskId": "import-snap-0d2d72622b4359567",
+			"SnapshotTaskDetail": {
+				"DiskImageSize": 0.0,
+				"Progress": "0",
+				"Status": "active",
+				"StatusMessage": "pending",
+				"Url": "s3://tskrazy-import/tskrazy.img"
+			},
+			"Tags": []
+		}
+	*/
+	if err := json.Unmarshal(out, &resp); err != nil {
+		return "", fmt.Errorf("unmarshal response: %v: %s", err, out)
+	}
+	return resp.ImportTaskID, nil
+}
+
+/*
+% aws ec2 describe-import-snapshot-tasks --import-task-ids import-snap-0d2d72622b4359567
+{
+    "ImportSnapshotTasks": [
+        {
+            "ImportTaskId": "import-snap-0d2d72622b4359567",
+            "SnapshotTaskDetail": {
+                "DiskImageSize": 1258299392.0,
+                "Format": "RAW",
+                "SnapshotId": "snap-053efd3539d787927",
+                "Status": "completed",
+                "Url": "s3://tskrazy-import/tskrazy.img",
+                "UserBucket": {
+                    "S3Bucket": "tskrazy-import",
+                    "S3Key": "tskrazy.img"
+                }
+            },
+            "Tags": []
+        }
+    ]
+}
+*/
+
+func waitForImportSnapshot(importTaskID string) (snapID string, err error) {
+	for {
+		out, err := exec.Command("aws", "ec2", "describe-import-snapshot-tasks", "--import-task-ids", importTaskID).CombinedOutput()
+		if err != nil {
+			return "", fmt.Errorf("describe import snapshot tasks: %v: %s", err, out)
+		}
+
+		var resp struct {
+			ImportSnapshotTasks []struct {
+				SnapshotTaskDetail struct {
+					SnapshotID string `json:"SnapshotId"`
+					Status     string `json:"Status"`
+				} `json:"SnapshotTaskDetail"`
+			} `json:"ImportSnapshotTasks"`
+		}
+		if err := json.Unmarshal(out, &resp); err != nil {
+			return "", fmt.Errorf("unmarshal response: %v: %s", err, out)
+		}
+		if len(resp.ImportSnapshotTasks) > 0 {
+			first := &resp.ImportSnapshotTasks[0]
+			if first.SnapshotTaskDetail.Status == "completed" {
+				return first.SnapshotTaskDetail.SnapshotID, nil
+			}
+		}
+		log.Printf("Still waiting; got: %s", out)
+		time.Sleep(5 * time.Second)
+
+		// TODO(bradfitz): percentage bar?
+		// Looks like:
+		/* 2024/05/14 13:03:21 Still waiting; got: {
+		    "ImportSnapshotTasks": [
+		        {
+		            "ImportTaskId": "import-snap-0232251d0fbcb33fd",
+		            "SnapshotTaskDetail": {
+		                "DiskImageSize": 1258299392.0,
+		                "Format": "RAW",
+		                "Progress": "32",
+		                "Status": "active",
+		                "StatusMessage": "validated",
+		                "Url": "s3://tskrazy-import/tskrazy.img",
+		                "UserBucket": {
+		                    "S3Bucket": "tskrazy-import",
+		                    "S3Key": "tskrazy.img"
+		                }
+		            },
+		            "Tags": []
+		        }
+		    ]
+		}*/
+	}
+}
+
+func makeAMI(name, ebsSnapID string) (ami string, err error) {
+	out, err := exec.Command("aws", "ec2", "register-image",
+		"--name", name,
+		"--architecture", "x86_64",
+		"--root-device-name", "/dev/sda",
+		"--ena-support",
+		"--imds-support", "v2.0",
+		"--boot-mode", "uefi-preferred",
+		"--block-device-mappings", "DeviceName=/dev/sda,Ebs={SnapshotId="+ebsSnapID+"}").CombinedOutput()
+	if err != nil {
+		return "", fmt.Errorf("register image: %v: %s", err, out)
+	}
+	/*
+		On success:
+		{
+		    "ImageId": "ami-052e1538166886ad2"
+		}
+	*/
+	var resp struct {
+		ImageID string `json:"ImageId"`
+	}
+	if err := json.Unmarshal(out, &resp); err != nil {
+		return "", fmt.Errorf("unmarshal response: %v: %s", err, out)
+	}
+	if resp.ImageID == "" {
+		return "", fmt.Errorf("empty image ID in response: %s", out)
+	}
+	return resp.ImageID, nil
+}
diff --git a/gokrazy/go.mod b/gokrazy/go.mod
new file mode 100644
index 000000000..896ff7ecd
--- /dev/null
+++ b/gokrazy/go.mod
@@ -0,0 +1,25 @@
+module tailscale.com/gokrazy
+
+go 1.22
+
+require github.com/gokrazy/tools v0.0.0-20240510170341-34b02e215bc2
+
+require (
+	github.com/breml/rootcerts v0.2.10 // indirect
+	github.com/donovanhide/eventsource v0.0.0-20210830082556-c59027999da0 // indirect
+	github.com/gokrazy/internal v0.0.0-20240510165500-68dd68393b7a // indirect
+	github.com/gokrazy/updater v0.0.0-20230215172637-813ccc7f21e2 // indirect
+	github.com/google/renameio/v2 v2.0.0 // indirect
+	github.com/inconshreveable/mousetrap v1.1.0 // indirect
+	github.com/spf13/cobra v1.6.1 // indirect
+	github.com/spf13/pflag v1.0.5 // indirect
+	golang.org/x/mod v0.11.0 // indirect
+	golang.org/x/sync v0.1.0 // indirect
+	golang.org/x/sys v0.20.0 // indirect
+)
+
+replace github.com/gokrazy/gokrazy => github.com/tailscale/gokrazy v0.0.0-20240602215456-7b9b6bbf726a
+
+replace github.com/gokrazy/tools => github.com/tailscale/gokrazy-tools v0.0.0-20240602210012-933640538dcf
+
+replace github.com/gokrazy/internal => github.com/tailscale/gokrazy-internal v0.0.0-20240602195241-04c5eda9f6cd
diff --git a/gokrazy/go.sum b/gokrazy/go.sum
new file mode 100644
index 000000000..04522e468
--- /dev/null
+++ b/gokrazy/go.sum
@@ -0,0 +1,33 @@
+github.com/breml/rootcerts v0.2.10 h1:UGVZ193UTSUASpGtg6pbDwzOd7XQP+at0Ssg1/2E4h8=
+github.com/breml/rootcerts v0.2.10/go.mod h1:24FDtzYMpqIeYC7QzaE8VPRQaFZU5TIUDlyk8qwjD88=
+github.com/cpuguy83/go-md2man/v2 v2.0.2/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
+github.com/donovanhide/eventsource v0.0.0-20210830082556-c59027999da0 h1:C7t6eeMaEQVy6e8CarIhscYQlNmw5e3G36y7l7Y21Ao=
+github.com/donovanhide/eventsource v0.0.0-20210830082556-c59027999da0/go.mod h1:56wL82FO0bfMU5RvfXoIwSOP2ggqqxT+tAfNEIyxuHw=
+github.com/gokrazy/updater v0.0.0-20230215172637-813ccc7f21e2 h1:kBY5R1tSf+EYZ+QaSrofLaVJtBqYsVNVBWkdMq3Smcg=
+github.com/gokrazy/updater v0.0.0-20230215172637-813ccc7f21e2/go.mod h1:PYOvzGOL4nlBmuxu7IyKQTFLaxr61+WPRNRzVtuYOHw=
+github.com/google/go-cmp v0.5.9 h1:O2Tfq5qg4qc4AmwVlvv0oLiVAGB7enBSJ2x2DqQFi38=
+github.com/google/go-cmp v0.5.9/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
+github.com/google/renameio/v2 v2.0.0 h1:UifI23ZTGY8Tt29JbYFiuyIU3eX+RNFtUwefq9qAhxg=
+github.com/google/renameio/v2 v2.0.0/go.mod h1:BtmJXm5YlszgC+TD4HOEEUFgkJP3nLxehU6hfe7jRt4=
+github.com/inconshreveable/mousetrap v1.0.1/go.mod h1:vpF70FUmC8bwa3OWnCshd2FqLfsEA9PFc4w1p2J65bw=
+github.com/inconshreveable/mousetrap v1.1.0 h1:wN+x4NVGpMsO7ErUn/mUI3vEoE6Jt13X2s0bqwp9tc8=
+github.com/inconshreveable/mousetrap v1.1.0/go.mod h1:vpF70FUmC8bwa3OWnCshd2FqLfsEA9PFc4w1p2J65bw=
+github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
+github.com/spf13/cobra v1.6.1 h1:o94oiPyS4KD1mPy2fmcYYHHfCxLqYjJOhGsCHFZtEzA=
+github.com/spf13/cobra v1.6.1/go.mod h1:IOw/AERYS7UzyrGinqmz6HLUo219MORXGxhbaJUqzrY=
+github.com/spf13/pflag v1.0.5 h1:iy+VFUOCP1a+8yFto/drg2CJ5u0yRoB7fZw3DKv/JXA=
+github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
+github.com/tailscale/gokrazy-internal v0.0.0-20240602195241-04c5eda9f6cd h1:ZJplHHhYSzxYmrXuDPCNChGRZbLkPqRkYqRBM7KNyng=
+github.com/tailscale/gokrazy-internal v0.0.0-20240602195241-04c5eda9f6cd/go.mod h1:t3ZirVhcs9bH+fPAJuGh51rzT7sVCZ9yfXvszf0ZjF0=
+github.com/tailscale/gokrazy-tools v0.0.0-20240602210012-933640538dcf h1:lmAGqLbIVoMK1TYWqJvxKFsu+Tb1OecgvXTmypZGAZY=
+github.com/tailscale/gokrazy-tools v0.0.0-20240602210012-933640538dcf/go.mod h1:+PSix9a8BHqAz6RV/9+tiE3C1ou0GA1ViR8pqAZVfwI=
+golang.org/x/mod v0.11.0 h1:bUO06HqtnRcc/7l71XBe4WcqTZ+3AH1J59zWDDwLKgU=
+golang.org/x/mod v0.11.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
+golang.org/x/sync v0.1.0 h1:wsuoTGHzEhffawBOhz5CYhcrV4IdKZbEyZjBMuTp12o=
+golang.org/x/sync v0.1.0/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sys v0.20.0 h1:Od9JTbYCk261bKm4M/mw7AklTlFYIa0bIp9BgSm1S8Y=
+golang.org/x/sys v0.20.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/tools v0.1.12 h1:VveCTK38A2rkS8ZqFY25HIDFscX5X9OoEhJd3quQmXU=
+golang.org/x/tools v0.1.12/go.mod h1:hNGJHUnrk76NpqgfD5Aqm5Crs+Hm0VOH/i9J2+nxYbc=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
diff --git a/gokrazy/tidy-deps.go b/gokrazy/tidy-deps.go
new file mode 100644
index 000000000..104156e47
--- /dev/null
+++ b/gokrazy/tidy-deps.go
@@ -0,0 +1,10 @@
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
+
+//go:build for_go_mod_tidy
+
+package gokrazy
+
+import (
+	_ "github.com/gokrazy/tools/cmd/gok"
+)
diff --git a/gokrazy/tsapp/README.md b/gokrazy/tsapp/README.md
new file mode 100644
index 000000000..8367b748f
--- /dev/null
+++ b/gokrazy/tsapp/README.md
@@ -0,0 +1,12 @@
+# Tailscale Appliance
+
+This is the definition of the Gokrazy Tailscale Appliance (tsapp) image.
+See the parent directory for context.
+
+## File contents
+
+The `config.json` is a Gokrazy config.
+
+The `usr-dir.tar` is a single symlink named `bin` pointing to `/user`. We write it to `/usr/bin => /user` so the Busybox `ash` shell's default `$PATH` includes `/user`, where the `tailscale` CLI is.
+
+The `builddir` is the Gokrazy build environment, defining each program's `go.mod`.
diff --git a/gokrazy/tsapp/builddir/github.com/gokrazy/breakglass/go.mod b/gokrazy/tsapp/builddir/github.com/gokrazy/breakglass/go.mod
new file mode 100644
index 000000000..57fb65af3
--- /dev/null
+++ b/gokrazy/tsapp/builddir/github.com/gokrazy/breakglass/go.mod
@@ -0,0 +1,7 @@
+module gokrazy/build/tsapp
+
+go 1.22.2
+
+require github.com/gokrazy/breakglass v0.0.0-20240529175905-44b3fe64f19c // indirect
+
+replace github.com/gokrazy/breakglass => github.com/tailscale/breakglass v0.0.0-20240529174846-0d8ebfc2c652
diff --git a/gokrazy/tsapp/builddir/github.com/gokrazy/breakglass/go.sum b/gokrazy/tsapp/builddir/github.com/gokrazy/breakglass/go.sum
new file mode 100644
index 000000000..405b9c3da
--- /dev/null
+++ b/gokrazy/tsapp/builddir/github.com/gokrazy/breakglass/go.sum
@@ -0,0 +1,28 @@
+github.com/creack/pty v1.1.18 h1:n56/Zwd5o6whRC5PMGretI4IdRLlmBXYNjScPaBgsbY=
+github.com/creack/pty v1.1.18/go.mod h1:MOBLtS5ELjhRRrroQr9kyvTxUAFNvYEK993ew/Vr4O4=
+github.com/gokrazy/breakglass v0.0.0-20240529175905-44b3fe64f19c h1:cWzgXJIluB6jAQ0HcnvA1yExLawmtDSssk9H4fLv3yM=
+github.com/gokrazy/breakglass v0.0.0-20240529175905-44b3fe64f19c/go.mod h1:4Yffo2Z5w3q2eDvo3HDR8eDnmkDpMAkX0Tn7b/9upgs=
+github.com/gokrazy/gokrazy v0.0.0-20230812092215-346db1998f83 h1:Y4sADvUYd/c0eqnqebipHHl0GMpAxOQeTzPnwI4ievM=
+github.com/gokrazy/gokrazy v0.0.0-20230812092215-346db1998f83/go.mod h1:9q5Tg+q+YvRjC3VG0gfMFut46dhbhtAnvUEp4lPjc6c=
+github.com/gokrazy/internal v0.0.0-20230211171410-9608422911d0 h1:QTi0skQ/OM7he/5jEWA9k/DYgdwGAhw3hrUoiPGGZHM=
+github.com/gokrazy/internal v0.0.0-20230211171410-9608422911d0/go.mod h1:ddHcxXZ/VVQOSAWcRBbkYY58+QOw4L145ye6phyDmRA=
+github.com/google/renameio/v2 v2.0.0 h1:UifI23ZTGY8Tt29JbYFiuyIU3eX+RNFtUwefq9qAhxg=
+github.com/google/renameio/v2 v2.0.0/go.mod h1:BtmJXm5YlszgC+TD4HOEEUFgkJP3nLxehU6hfe7jRt4=
+github.com/google/shlex v0.0.0-20191202100458-e7afc7fbc510 h1:El6M4kTTCOh6aBiKaUGG7oYTSPP8MxqL4YI3kZKwcP4=
+github.com/google/shlex v0.0.0-20191202100458-e7afc7fbc510/go.mod h1:pupxD2MaaD3pAXIBCelhxNneeOaAeabZDe5s4K6zSpQ=
+github.com/kenshaw/evdev v0.1.0 h1:wmtceEOFfilChgdNT+c/djPJ2JineVsQ0N14kGzFRUo=
+github.com/kenshaw/evdev v0.1.0/go.mod h1:B/fErKCihUyEobz0mjn2qQbHgyJKFQAxkXSvkeeA/Wo=
+github.com/kr/fs v0.1.0 h1:Jskdu9ieNAYnjxsi0LbQp1ulIKZV1LAFgK1tWhpZgl8=
+github.com/kr/fs v0.1.0/go.mod h1:FFnZGqtBN9Gxj7eW1uZ42v5BccTP0vu6NEaFoC2HwRg=
+github.com/kr/pty v1.1.8 h1:AkaSdXYQOWeaO3neb8EM634ahkXXe3jYbVh/F9lq+GI=
+github.com/kr/pty v1.1.8/go.mod h1:O1sed60cT9XZ5uDucP5qwvh+TE3NnUj51EiZO/lmSfw=
+github.com/mdlayher/watchdog v0.0.0-20221003142519-49be0df7b3b5 h1:80FAK3TW5lVymfHu3kvB1QvTZvy9Kmx1lx6sT5Ep16s=
+github.com/mdlayher/watchdog v0.0.0-20221003142519-49be0df7b3b5/go.mod h1:z0QjVpjpK4jksEkffQwS3+abQ3XFTm1bnimyDzWyUk0=
+github.com/pkg/sftp v1.13.5 h1:a3RLUqkyjYRtBTZJZ1VRrKbN3zhuPLlUc3sphVz81go=
+github.com/pkg/sftp v1.13.5/go.mod h1:wHDZ0IZX6JcBYRK1TH9bcVq8G7TLpVHYIGJRFnmPfxg=
+github.com/tailscale/breakglass v0.0.0-20240529174846-0d8ebfc2c652 h1:36TB+ZuYaA8OTdMoPnygC9CJuQmTWxMEmn+a+9XTOgk=
+github.com/tailscale/breakglass v0.0.0-20240529174846-0d8ebfc2c652/go.mod h1:4Yffo2Z5w3q2eDvo3HDR8eDnmkDpMAkX0Tn7b/9upgs=
+golang.org/x/crypto v0.17.0 h1:r8bRNjWL3GshPW3gkd+RpvzWrZAwPS49OmTGZ/uhM4k=
+golang.org/x/crypto v0.17.0/go.mod h1:gCAAfMLgwOJRpTjQ2zCCt2OcSfYMTeZVSRtQlPC7Nq4=
+golang.org/x/sys v0.15.0 h1:h48lPFYpsTvQJZF4EKyI4aLHaev3CxivZmv7yZig9pc=
+golang.org/x/sys v0.15.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
diff --git a/gokrazy/tsapp/builddir/github.com/gokrazy/gokrazy/cmd/dhcp/go.mod b/gokrazy/tsapp/builddir/github.com/gokrazy/gokrazy/cmd/dhcp/go.mod
new file mode 100644
index 000000000..c56dede46
--- /dev/null
+++ b/gokrazy/tsapp/builddir/github.com/gokrazy/gokrazy/cmd/dhcp/go.mod
@@ -0,0 +1,18 @@
+module gokrazy/build/tsapp
+
+go 1.22.2
+
+require (
+	github.com/gokrazy/gokrazy v0.0.0-20240525065858-dedadaf38803 // indirect
+	github.com/google/gopacket v1.1.19 // indirect
+	github.com/google/renameio/v2 v2.0.0 // indirect
+	github.com/josharian/native v1.0.0 // indirect
+	github.com/mdlayher/packet v1.0.0 // indirect
+	github.com/mdlayher/socket v0.2.3 // indirect
+	github.com/rtr7/dhcp4 v0.0.0-20220302171438-18c84d089b46 // indirect
+	github.com/vishvananda/netlink v1.1.0 // indirect
+	github.com/vishvananda/netns v0.0.0-20211101163701-50045581ed74 // indirect
+	golang.org/x/net v0.23.0 // indirect
+	golang.org/x/sync v0.0.0-20210220032951-036812b2e83c // indirect
+	golang.org/x/sys v0.20.0 // indirect
+)
diff --git a/gokrazy/tsapp/builddir/github.com/gokrazy/gokrazy/cmd/dhcp/go.sum b/gokrazy/tsapp/builddir/github.com/gokrazy/gokrazy/cmd/dhcp/go.sum
new file mode 100644
index 000000000..3cd002ae7
--- /dev/null
+++ b/gokrazy/tsapp/builddir/github.com/gokrazy/gokrazy/cmd/dhcp/go.sum
@@ -0,0 +1,39 @@
+github.com/gokrazy/gokrazy v0.0.0-20240525065858-dedadaf38803 h1:gdGRW/wXHPJuZgZD931Lh75mdJfzEEXrL+Dvi97Ck3A=
+github.com/gokrazy/gokrazy v0.0.0-20240525065858-dedadaf38803/go.mod h1:NHROeDlzn0icUl3f+tEYvGGpcyBDMsr3AvKLHOWRe5M=
+github.com/google/gopacket v1.1.19 h1:ves8RnFZPGiFnTS0uPQStjwru6uO6h+nlr9j6fL7kF8=
+github.com/google/gopacket v1.1.19/go.mod h1:iJ8V8n6KS+z2U1A8pUwu8bW5SyEMkXJB8Yo/Vo+TKTo=
+github.com/google/renameio/v2 v2.0.0 h1:UifI23ZTGY8Tt29JbYFiuyIU3eX+RNFtUwefq9qAhxg=
+github.com/google/renameio/v2 v2.0.0/go.mod h1:BtmJXm5YlszgC+TD4HOEEUFgkJP3nLxehU6hfe7jRt4=
+github.com/josharian/native v1.0.0 h1:Ts/E8zCSEsG17dUqv7joXJFybuMLjQfWE04tsBODTxk=
+github.com/josharian/native v1.0.0/go.mod h1:7X/raswPFr05uY3HiLlYeyQntB6OO7E/d2Cu7qoaN2w=
+github.com/mdlayher/packet v1.0.0 h1:InhZJbdShQYt6XV2GPj5XHxChzOfhJJOMbvnGAmOfQ8=
+github.com/mdlayher/packet v1.0.0/go.mod h1:eE7/ctqDhoiRhQ44ko5JZU2zxB88g+JH/6jmnjzPjOU=
+github.com/mdlayher/socket v0.2.3 h1:XZA2X2TjdOwNoNPVPclRCURoX/hokBY8nkTmRZFEheM=
+github.com/mdlayher/socket v0.2.3/go.mod h1:bz12/FozYNH/VbvC3q7TRIK/Y6dH1kCKsXaUeXi/FmY=
+github.com/rtr7/dhcp4 v0.0.0-20220302171438-18c84d089b46 h1:3psQveH4RUiv5yc3p7kRySilf1nSXLQhAvJFwg4fgnE=
+github.com/rtr7/dhcp4 v0.0.0-20220302171438-18c84d089b46/go.mod h1:Ng1F/s+z0zCMsbEFEneh+30LJa9DrTfmA+REbEqcTPk=
+github.com/vishvananda/netlink v1.1.0 h1:1iyaYNBLmP6L0220aDnYQpo1QEV4t4hJ+xEEhhJH8j0=
+github.com/vishvananda/netlink v1.1.0/go.mod h1:cTgwzPIzzgDAYoQrMm0EdrjRUBkTqKYppBueQtXaqoE=
+github.com/vishvananda/netns v0.0.0-20191106174202-0a2b9b5464df/go.mod h1:JP3t17pCcGlemwknint6hfoeCVQrEMVwxRLRjXpq+BU=
+github.com/vishvananda/netns v0.0.0-20211101163701-50045581ed74 h1:gga7acRE695APm9hlsSMoOoE65U4/TcqNj90mc69Rlg=
+github.com/vishvananda/netns v0.0.0-20211101163701-50045581ed74/go.mod h1:DD4vA1DwXk04H54A1oHXtwZmA0grkVMdPxx/VGLCah0=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
+golang.org/x/lint v0.0.0-20200302205851-738671d3881b/go.mod h1:3xt1FjdF8hUf6vQPIChWIBhFzV8gjjsPE/fR3IyQdNY=
+golang.org/x/mod v0.1.1-0.20191105210325-c90efee705ee/go.mod h1:QqPTAvyqsEbceGzBzNggFXnrqF1CaUcvgkdR5Ot7KZg=
+golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
+golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/net v0.23.0 h1:7EYJ93RZ9vYSZAIb2x3lnuvqO5zneoD6IvWjuhfxjTs=
+golang.org/x/net v0.23.0/go.mod h1:JKghWKKOSdJwpW2GEx0Ja7fmaKnMsbu+MWVZTokSYmg=
+golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.0.0-20210220032951-036812b2e83c h1:5KslGYwFpkhGh+Q16bwMP3cOontH8FOep7tGV86Y7SQ=
+golang.org/x/sync v0.0.0-20210220032951-036812b2e83c/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20190606203320-7fc4e5ec1444/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20200217220822-9197077df867/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.20.0 h1:Od9JTbYCk261bKm4M/mw7AklTlFYIa0bIp9BgSm1S8Y=
+golang.org/x/sys v0.20.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/tools v0.0.0-20200130002326-2f3ba24bd6e7/go.mod h1:TB2adYChydJhpapKDTa4BR/hXlZSLoq2Wpct/0txZ28=
+golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
diff --git a/gokrazy/tsapp/builddir/github.com/gokrazy/gokrazy/cmd/heartbeat/go.mod b/gokrazy/tsapp/builddir/github.com/gokrazy/gokrazy/cmd/heartbeat/go.mod
new file mode 100644
index 000000000..d851081bb
--- /dev/null
+++ b/gokrazy/tsapp/builddir/github.com/gokrazy/gokrazy/cmd/heartbeat/go.mod
@@ -0,0 +1,5 @@
+module gokrazy/build/tsapp
+
+go 1.22.2
+
+require github.com/gokrazy/gokrazy v0.0.0-20240525065858-dedadaf38803 // indirect
diff --git a/gokrazy/tsapp/builddir/github.com/gokrazy/gokrazy/cmd/heartbeat/go.sum b/gokrazy/tsapp/builddir/github.com/gokrazy/gokrazy/cmd/heartbeat/go.sum
new file mode 100644
index 000000000..4c510f049
--- /dev/null
+++ b/gokrazy/tsapp/builddir/github.com/gokrazy/gokrazy/cmd/heartbeat/go.sum
@@ -0,0 +1,14 @@
+github.com/gokrazy/gokrazy v0.0.0-20240525065858-dedadaf38803 h1:gdGRW/wXHPJuZgZD931Lh75mdJfzEEXrL+Dvi97Ck3A=
+github.com/gokrazy/gokrazy v0.0.0-20240525065858-dedadaf38803/go.mod h1:NHROeDlzn0icUl3f+tEYvGGpcyBDMsr3AvKLHOWRe5M=
+github.com/gokrazy/internal v0.0.0-20240510165500-68dd68393b7a h1:FKeN678rNpKTpWRdFbAhYL9mWzPu57R5XPXCR3WmXdI=
+github.com/gokrazy/internal v0.0.0-20240510165500-68dd68393b7a/go.mod h1:t3ZirVhcs9bH+fPAJuGh51rzT7sVCZ9yfXvszf0ZjF0=
+github.com/google/renameio/v2 v2.0.0 h1:UifI23ZTGY8Tt29JbYFiuyIU3eX+RNFtUwefq9qAhxg=
+github.com/google/renameio/v2 v2.0.0/go.mod h1:BtmJXm5YlszgC+TD4HOEEUFgkJP3nLxehU6hfe7jRt4=
+github.com/kenshaw/evdev v0.1.0 h1:wmtceEOFfilChgdNT+c/djPJ2JineVsQ0N14kGzFRUo=
+github.com/kenshaw/evdev v0.1.0/go.mod h1:B/fErKCihUyEobz0mjn2qQbHgyJKFQAxkXSvkeeA/Wo=
+github.com/mdlayher/watchdog v0.0.0-20201005150459-8bdc4f41966b h1:7tUBfsEEBWfFeHOB7CUfoOamak+Gx/BlirfXyPk1WjI=
+github.com/mdlayher/watchdog v0.0.0-20201005150459-8bdc4f41966b/go.mod h1:bmoJUS6qOA3uKFvF3KVuhf7mU1KQirzQMeHXtPyKEqg=
+github.com/spf13/pflag v1.0.5 h1:iy+VFUOCP1a+8yFto/drg2CJ5u0yRoB7fZw3DKv/JXA=
+github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
+golang.org/x/sys v0.20.0 h1:Od9JTbYCk261bKm4M/mw7AklTlFYIa0bIp9BgSm1S8Y=
+golang.org/x/sys v0.20.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
diff --git a/gokrazy/tsapp/builddir/github.com/gokrazy/gokrazy/cmd/ntp/go.mod b/gokrazy/tsapp/builddir/github.com/gokrazy/gokrazy/cmd/ntp/go.mod
new file mode 100644
index 000000000..d851081bb
--- /dev/null
+++ b/gokrazy/tsapp/builddir/github.com/gokrazy/gokrazy/cmd/ntp/go.mod
@@ -0,0 +1,5 @@
+module gokrazy/build/tsapp
+
+go 1.22.2
+
+require github.com/gokrazy/gokrazy v0.0.0-20240525065858-dedadaf38803 // indirect
diff --git a/gokrazy/tsapp/builddir/github.com/gokrazy/gokrazy/cmd/ntp/go.sum b/gokrazy/tsapp/builddir/github.com/gokrazy/gokrazy/cmd/ntp/go.sum
new file mode 100644
index 000000000..d3dc288ed
--- /dev/null
+++ b/gokrazy/tsapp/builddir/github.com/gokrazy/gokrazy/cmd/ntp/go.sum
@@ -0,0 +1,8 @@
+github.com/beevik/ntp v0.3.0 h1:xzVrPrE4ziasFXgBVBZJDP0Wg/KpMwk2KHJ4Ba8GrDw=
+github.com/beevik/ntp v0.3.0/go.mod h1:hIHWr+l3+/clUnF44zdK+CWW7fO8dR5cIylAQ76NRpg=
+github.com/gokrazy/gokrazy v0.0.0-20240525065858-dedadaf38803 h1:gdGRW/wXHPJuZgZD931Lh75mdJfzEEXrL+Dvi97Ck3A=
+github.com/gokrazy/gokrazy v0.0.0-20240525065858-dedadaf38803/go.mod h1:NHROeDlzn0icUl3f+tEYvGGpcyBDMsr3AvKLHOWRe5M=
+golang.org/x/net v0.23.0 h1:7EYJ93RZ9vYSZAIb2x3lnuvqO5zneoD6IvWjuhfxjTs=
+golang.org/x/net v0.23.0/go.mod h1:JKghWKKOSdJwpW2GEx0Ja7fmaKnMsbu+MWVZTokSYmg=
+golang.org/x/sys v0.20.0 h1:Od9JTbYCk261bKm4M/mw7AklTlFYIa0bIp9BgSm1S8Y=
+golang.org/x/sys v0.20.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
diff --git a/gokrazy/tsapp/builddir/github.com/gokrazy/gokrazy/cmd/randomd/go.mod b/gokrazy/tsapp/builddir/github.com/gokrazy/gokrazy/cmd/randomd/go.mod
new file mode 100644
index 000000000..d851081bb
--- /dev/null
+++ b/gokrazy/tsapp/builddir/github.com/gokrazy/gokrazy/cmd/randomd/go.mod
@@ -0,0 +1,5 @@
+module gokrazy/build/tsapp
+
+go 1.22.2
+
+require github.com/gokrazy/gokrazy v0.0.0-20240525065858-dedadaf38803 // indirect
diff --git a/gokrazy/tsapp/builddir/github.com/gokrazy/gokrazy/cmd/randomd/go.sum b/gokrazy/tsapp/builddir/github.com/gokrazy/gokrazy/cmd/randomd/go.sum
new file mode 100644
index 000000000..0e63641e9
--- /dev/null
+++ b/gokrazy/tsapp/builddir/github.com/gokrazy/gokrazy/cmd/randomd/go.sum
@@ -0,0 +1,4 @@
+github.com/gokrazy/gokrazy v0.0.0-20240525065858-dedadaf38803 h1:gdGRW/wXHPJuZgZD931Lh75mdJfzEEXrL+Dvi97Ck3A=
+github.com/gokrazy/gokrazy v0.0.0-20240525065858-dedadaf38803/go.mod h1:NHROeDlzn0icUl3f+tEYvGGpcyBDMsr3AvKLHOWRe5M=
+golang.org/x/sys v0.20.0 h1:Od9JTbYCk261bKm4M/mw7AklTlFYIa0bIp9BgSm1S8Y=
+golang.org/x/sys v0.20.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
diff --git a/gokrazy/tsapp/builddir/github.com/gokrazy/gokrazy/go.mod b/gokrazy/tsapp/builddir/github.com/gokrazy/gokrazy/go.mod
new file mode 100644
index 000000000..f4172258d
--- /dev/null
+++ b/gokrazy/tsapp/builddir/github.com/gokrazy/gokrazy/go.mod
@@ -0,0 +1,7 @@
+module gokrazy/build/tsapp
+
+go 1.22.2
+
+require github.com/gokrazy/gokrazy v0.0.0-20240525065858-dedadaf38803 // indirect
+
+replace github.com/gokrazy/gokrazy => github.com/tailscale/gokrazy v0.0.0-20240602215456-7b9b6bbf726a
diff --git a/gokrazy/tsapp/builddir/github.com/gokrazy/gokrazy/go.sum b/gokrazy/tsapp/builddir/github.com/gokrazy/gokrazy/go.sum
new file mode 100644
index 000000000..1a80c04cf
--- /dev/null
+++ b/gokrazy/tsapp/builddir/github.com/gokrazy/gokrazy/go.sum
@@ -0,0 +1,16 @@
+github.com/gokrazy/gokrazy v0.0.0-20240525065858-dedadaf38803 h1:gdGRW/wXHPJuZgZD931Lh75mdJfzEEXrL+Dvi97Ck3A=
+github.com/gokrazy/gokrazy v0.0.0-20240525065858-dedadaf38803/go.mod h1:NHROeDlzn0icUl3f+tEYvGGpcyBDMsr3AvKLHOWRe5M=
+github.com/gokrazy/internal v0.0.0-20240510165500-68dd68393b7a h1:FKeN678rNpKTpWRdFbAhYL9mWzPu57R5XPXCR3WmXdI=
+github.com/gokrazy/internal v0.0.0-20240510165500-68dd68393b7a/go.mod h1:t3ZirVhcs9bH+fPAJuGh51rzT7sVCZ9yfXvszf0ZjF0=
+github.com/google/renameio/v2 v2.0.0 h1:UifI23ZTGY8Tt29JbYFiuyIU3eX+RNFtUwefq9qAhxg=
+github.com/google/renameio/v2 v2.0.0/go.mod h1:BtmJXm5YlszgC+TD4HOEEUFgkJP3nLxehU6hfe7jRt4=
+github.com/kenshaw/evdev v0.1.0 h1:wmtceEOFfilChgdNT+c/djPJ2JineVsQ0N14kGzFRUo=
+github.com/kenshaw/evdev v0.1.0/go.mod h1:B/fErKCihUyEobz0mjn2qQbHgyJKFQAxkXSvkeeA/Wo=
+github.com/mdlayher/watchdog v0.0.0-20201005150459-8bdc4f41966b h1:7tUBfsEEBWfFeHOB7CUfoOamak+Gx/BlirfXyPk1WjI=
+github.com/mdlayher/watchdog v0.0.0-20201005150459-8bdc4f41966b/go.mod h1:bmoJUS6qOA3uKFvF3KVuhf7mU1KQirzQMeHXtPyKEqg=
+github.com/spf13/pflag v1.0.5 h1:iy+VFUOCP1a+8yFto/drg2CJ5u0yRoB7fZw3DKv/JXA=
+github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
+github.com/tailscale/gokrazy v0.0.0-20240602215456-7b9b6bbf726a h1:7dnA8x14JihQmKbPr++Y5CCN/XSyDmOB6cXUxcIj6VQ=
+github.com/tailscale/gokrazy v0.0.0-20240602215456-7b9b6bbf726a/go.mod h1:NHROeDlzn0icUl3f+tEYvGGpcyBDMsr3AvKLHOWRe5M=
+golang.org/x/sys v0.20.0 h1:Od9JTbYCk261bKm4M/mw7AklTlFYIa0bIp9BgSm1S8Y=
+golang.org/x/sys v0.20.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
diff --git a/gokrazy/tsapp/builddir/github.com/gokrazy/mkfs/go.mod b/gokrazy/tsapp/builddir/github.com/gokrazy/mkfs/go.mod
new file mode 100644
index 000000000..8aa5a2955
--- /dev/null
+++ b/gokrazy/tsapp/builddir/github.com/gokrazy/mkfs/go.mod
@@ -0,0 +1,5 @@
+module gokrazy/build/tsapp
+
+go 1.22.2
+
+require github.com/gokrazy/mkfs v0.0.0-20230114091253-b6755f9e9632 // indirect
diff --git a/gokrazy/tsapp/builddir/github.com/gokrazy/mkfs/go.sum b/gokrazy/tsapp/builddir/github.com/gokrazy/mkfs/go.sum
new file mode 100644
index 000000000..551d1b5d7
--- /dev/null
+++ b/gokrazy/tsapp/builddir/github.com/gokrazy/mkfs/go.sum
@@ -0,0 +1,4 @@
+github.com/gokrazy/internal v0.0.0-20210621162516-1b3b5687a06d h1:qk95CKJfxvU5oi3lbrVkEgID5ak1pOjTyPTdaXs6Q9E=
+github.com/gokrazy/internal v0.0.0-20210621162516-1b3b5687a06d/go.mod h1:Gqv1x1DNrObmBvVvblpZbvZizZ0dU5PwiwYHipmtY9Y=
+github.com/gokrazy/mkfs v0.0.0-20230114091253-b6755f9e9632 h1:Vt3rJdB4p56yjK4CKhb/awHT6Qj7LoC3CwPoOaiNS6k=
+github.com/gokrazy/mkfs v0.0.0-20230114091253-b6755f9e9632/go.mod h1:O2w1ipGvg78u3F61FnLp36Db3MsUbdy8E/ciG64jbGY=
diff --git a/gokrazy/tsapp/builddir/github.com/gokrazy/rpi-eeprom/go.mod b/gokrazy/tsapp/builddir/github.com/gokrazy/rpi-eeprom/go.mod
new file mode 100644
index 000000000..613104a7f
--- /dev/null
+++ b/gokrazy/tsapp/builddir/github.com/gokrazy/rpi-eeprom/go.mod
@@ -0,0 +1,5 @@
+module gokrazy/build/tsapp
+
+go 1.22.2
+
+require github.com/gokrazy/rpi-eeprom v0.0.0-20240518032756-37da22ee9608 // indirect
diff --git a/gokrazy/tsapp/builddir/github.com/gokrazy/rpi-eeprom/go.sum b/gokrazy/tsapp/builddir/github.com/gokrazy/rpi-eeprom/go.sum
new file mode 100644
index 000000000..b037c1056
--- /dev/null
+++ b/gokrazy/tsapp/builddir/github.com/gokrazy/rpi-eeprom/go.sum
@@ -0,0 +1,3 @@
+github.com/gokrazy/rpi-eeprom v0.0.0-20240518032756-37da22ee9608 h1:8uderKR+8eXR0nRcyBugql1YPoJQjpjoltHqX9yl2DI=
+github.com/gokrazy/rpi-eeprom v0.0.0-20240518032756-37da22ee9608/go.mod h1:vabxV1M+i6S3rGuWoFieHxCJW3jlob3rqe0KV82j+0o=
+golang.org/x/sync v0.0.0-20200317015054-43a5402ce75a/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
diff --git a/gokrazy/tsapp/builddir/github.com/gokrazy/serial-busybox/go.mod b/gokrazy/tsapp/builddir/github.com/gokrazy/serial-busybox/go.mod
new file mode 100644
index 000000000..de52e181b
--- /dev/null
+++ b/gokrazy/tsapp/builddir/github.com/gokrazy/serial-busybox/go.mod
@@ -0,0 +1,5 @@
+module gokrazy/build/tsapp
+
+go 1.22.2
+
+require github.com/gokrazy/serial-busybox v0.0.0-20220918193710-d728912733ca // indirect
diff --git a/gokrazy/tsapp/builddir/github.com/gokrazy/serial-busybox/go.sum b/gokrazy/tsapp/builddir/github.com/gokrazy/serial-busybox/go.sum
new file mode 100644
index 000000000..8135f60c3
--- /dev/null
+++ b/gokrazy/tsapp/builddir/github.com/gokrazy/serial-busybox/go.sum
@@ -0,0 +1,26 @@
+github.com/beevik/ntp v0.2.0/go.mod h1:hIHWr+l3+/clUnF44zdK+CWW7fO8dR5cIylAQ76NRpg=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/gokrazy/gokrazy v0.0.0-20200501080617-f3445e01a904 h1:eqfH4A/LLgxv5RvqEXwVoFvfmpRa8+TokRjB5g6xBkk=
+github.com/gokrazy/gokrazy v0.0.0-20200501080617-f3445e01a904/go.mod h1:pq6rGHqxMRPSaTXaCMzIZy0wLDusAJyoVNyNo05RLs0=
+github.com/gokrazy/internal v0.0.0-20200407075822-660ad467b7c9 h1:x5jR/nNo4/kMSoNo/nwa2xbL7PN1an8S3oIn4OZJdec=
+github.com/gokrazy/internal v0.0.0-20200407075822-660ad467b7c9/go.mod h1:LA5TQy7LcvYGQOy75tkrYkFUhbV2nl5qEBP47PSi2JA=
+github.com/gokrazy/serial-busybox v0.0.0-20220918193710-d728912733ca h1:x0eSjuFy8qsRctVHeWm3EC474q3xm4h3OOOrYpcqyyA=
+github.com/gokrazy/serial-busybox v0.0.0-20220918193710-d728912733ca/go.mod h1:OYcG5tSb+QrelmUOO4EZVUFcIHyyZb0QDbEbZFUp1TA=
+github.com/google/go-cmp v0.4.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+github.com/google/gopacket v1.1.16/go.mod h1:UCLx9mCmAwsVbn6qQl1WIEt2SO7Nd2fD0th1TBAsqBw=
+github.com/mdlayher/raw v0.0.0-20190303161257-764d452d77af/go.mod h1:rC/yE65s/DoHB6BzVOUBNYBGTg772JVytyAytffIZkY=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/rtr7/dhcp4 v0.0.0-20181120124042-778e8c2e24a5/go.mod h1:FwstIpm6vX98QgtR8KEwZcVjiRn2WP76LjXAHj84fK0=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.5.1/go.mod h1:5W2xD1RspED5o8YsWQXVCued0rvSQ+mT+I5cxcmMvtA=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/crypto v0.0.0-20191206172530-e9b2fee46413/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
+golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20200406155108-e3b113bbe6a4 h1:c1Sgqkh8v6ZxafNGG64r8C8UisIW2TKMJN8P86tKjr0=
+golang.org/x/sys v0.0.0-20200406155108-e3b113bbe6a4/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
diff --git a/gokrazy/tsapp/builddir/github.com/tailscale/gokrazy-kernel/go.mod b/gokrazy/tsapp/builddir/github.com/tailscale/gokrazy-kernel/go.mod
new file mode 100644
index 000000000..570b3ef4c
--- /dev/null
+++ b/gokrazy/tsapp/builddir/github.com/tailscale/gokrazy-kernel/go.mod
@@ -0,0 +1,5 @@
+module gokrazy/build/tsapp
+
+go 1.22.2
+
+require github.com/tailscale/gokrazy-kernel v0.0.0-20240530042707-3f95c886bcf2 // indirect
diff --git a/gokrazy/tsapp/builddir/github.com/tailscale/gokrazy-kernel/go.sum b/gokrazy/tsapp/builddir/github.com/tailscale/gokrazy-kernel/go.sum
new file mode 100644
index 000000000..edb1b5c05
--- /dev/null
+++ b/gokrazy/tsapp/builddir/github.com/tailscale/gokrazy-kernel/go.sum
@@ -0,0 +1,2 @@
+github.com/tailscale/gokrazy-kernel v0.0.0-20240530042707-3f95c886bcf2 h1:xzf+cMvBJBcA/Av7OTWBa0Tjrbfcy00TeatJeJt6zrY=
+github.com/tailscale/gokrazy-kernel v0.0.0-20240530042707-3f95c886bcf2/go.mod h1:7Mth+m9bq2IHusSsexMNyupHWPL8RxwOuSvBlSGtgDY=
diff --git a/gokrazy/tsapp/builddir/tailscale.com/cmd/tailscale/go.mod b/gokrazy/tsapp/builddir/tailscale.com/cmd/tailscale/go.mod
new file mode 100644
index 000000000..433b653d3
--- /dev/null
+++ b/gokrazy/tsapp/builddir/tailscale.com/cmd/tailscale/go.mod
@@ -0,0 +1,5 @@
+module gokrazy/build/tsapp
+
+go 1.22.2
+
+require tailscale.com v1.66.4 // indirect
diff --git a/gokrazy/tsapp/builddir/tailscale.com/cmd/tailscale/go.sum b/gokrazy/tsapp/builddir/tailscale.com/cmd/tailscale/go.sum
new file mode 100644
index 000000000..c2392cb72
--- /dev/null
+++ b/gokrazy/tsapp/builddir/tailscale.com/cmd/tailscale/go.sum
@@ -0,0 +1,86 @@
+filippo.io/edwards25519 v1.1.0 h1:FNf4tywRC1HmFuKW5xopWpigGjJKiJSV0Cqo0cJWDaA=
+filippo.io/edwards25519 v1.1.0/go.mod h1:BxyFTGdWcka3PhytdK4V28tE5sGfRvvvRV7EaN4VDT4=
+github.com/coreos/go-iptables v0.7.1-0.20240112124308-65c67c9f46e6 h1:8h5+bWd7R6AYUslN6c6iuZWTKsKxUFDlpnmilO6R2n0=
+github.com/coreos/go-iptables v0.7.1-0.20240112124308-65c67c9f46e6/go.mod h1:Qe8Bv2Xik5FyTXwgIbLAnv2sWSBmvWdFETJConOQ//Q=
+github.com/fxamacker/cbor/v2 v2.5.0 h1:oHsG0V/Q6E/wqTS2O1Cozzsy69nqCiguo5Q1a1ADivE=
+github.com/fxamacker/cbor/v2 v2.5.0/go.mod h1:TA1xS00nchWmaBnEIxPSE5oHLuJBAVvqrtAnWBwBCVo=
+github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da h1:oI5xCqsCo564l8iNU+DwB5epxmsaqB+rhGL0m5jtYqE=
+github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da/go.mod h1:cIg4eruTrX1D+g88fzRXU5OdNfaM+9IcxsU14FzY7Hc=
+github.com/google/nftables v0.2.1-0.20240414091927-5e242ec57806 h1:wG8RYIyctLhdFk6Vl1yPGtSRtwGpVkWyZww1OCil2MI=
+github.com/google/nftables v0.2.1-0.20240414091927-5e242ec57806/go.mod h1:Beg6V6zZ3oEn0JuiUQ4wqwuyqqzasOltcoXPtgLbFp4=
+github.com/google/uuid v1.5.0 h1:1p67kYwdtXjb0gL0BPiP1Av9wiZPo5A8z2cWkTZ+eyU=
+github.com/google/uuid v1.5.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
+github.com/gorilla/csrf v1.7.2 h1:oTUjx0vyf2T+wkrx09Trsev1TE+/EbDAeHtSTbtC2eI=
+github.com/gorilla/csrf v1.7.2/go.mod h1:F1Fj3KG23WYHE6gozCmBAezKookxbIvUJT+121wTuLk=
+github.com/gorilla/securecookie v1.1.2 h1:YCIWL56dvtr73r6715mJs5ZvhtnY73hBvEF8kXD8ePA=
+github.com/gorilla/securecookie v1.1.2/go.mod h1:NfCASbcHqRSY+3a8tlWJwsQap2VX5pwzwo4h3eOamfo=
+github.com/hdevalence/ed25519consensus v0.2.0 h1:37ICyZqdyj0lAZ8P4D1d1id3HqbbG1N3iBb1Tb4rdcU=
+github.com/hdevalence/ed25519consensus v0.2.0/go.mod h1:w3BHWjwJbFU29IRHL1Iqkw3sus+7FctEyM4RqDxYNzo=
+github.com/josharian/native v1.1.1-0.20230202152459-5c7d0dd6ab86 h1:elKwZS1OcdQ0WwEDBeqxKwb7WB62QX8bvZ/FJnVXIfk=
+github.com/josharian/native v1.1.1-0.20230202152459-5c7d0dd6ab86/go.mod h1:aFAMtuldEgx/4q7iSGazk22+IcgvtiC+HIimFO9XlS8=
+github.com/jsimonetti/rtnetlink v1.4.0 h1:Z1BF0fRgcETPEa0Kt0MRk3yV5+kF1FWTni6KUFKrq2I=
+github.com/jsimonetti/rtnetlink v1.4.0/go.mod h1:5W1jDvWdnthFJ7fxYX1GMK07BUpI4oskfOqvPteYS6E=
+github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51 h1:Z9n2FFNUXsshfwJMBgNA0RU6/i7WVaAegv3PtuIHPMs=
+github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51/go.mod h1:CzGEWj7cYgsdH8dAjBGEr58BoE7ScuLd+fwFZ44+/x8=
+github.com/mattn/go-colorable v0.1.13 h1:fFA4WZxdEF4tXPZVKMLwD8oUnCTTo08duU7wxecdEvA=
+github.com/mattn/go-colorable v0.1.13/go.mod h1:7S9/ev0klgBDR4GtXTXX8a3vIGJpMovkB8vQcUbaXHg=
+github.com/mattn/go-isatty v0.0.20 h1:xfD0iDuEKnDkl03q4limB+vH+GxLEtL/jb4xVJSWWEY=
+github.com/mattn/go-isatty v0.0.20/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
+github.com/mdlayher/netlink v1.7.2 h1:/UtM3ofJap7Vl4QWCPDGXY8d3GIY2UGSDbK+QWmY8/g=
+github.com/mdlayher/netlink v1.7.2/go.mod h1:xraEF7uJbxLhc5fpHL4cPe221LI2bdttWlU+ZGLfQSw=
+github.com/mdlayher/socket v0.5.0 h1:ilICZmJcQz70vrWVes1MFera4jGiWNocSkykwwoy3XI=
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diff --git a/gokrazy/tsapp/builddir/tailscale.com/cmd/tailscaled/go.mod b/gokrazy/tsapp/builddir/tailscale.com/cmd/tailscaled/go.mod
new file mode 100644
index 000000000..433b653d3
--- /dev/null
+++ b/gokrazy/tsapp/builddir/tailscale.com/cmd/tailscaled/go.mod
@@ -0,0 +1,5 @@
+module gokrazy/build/tsapp
+
+go 1.22.2
+
+require tailscale.com v1.66.4 // indirect
diff --git a/gokrazy/tsapp/builddir/tailscale.com/cmd/tailscaled/go.sum b/gokrazy/tsapp/builddir/tailscale.com/cmd/tailscaled/go.sum
new file mode 100644
index 000000000..1a62f9f18
--- /dev/null
+++ b/gokrazy/tsapp/builddir/tailscale.com/cmd/tailscaled/go.sum
@@ -0,0 +1,154 @@
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diff --git a/gokrazy/tsapp/config.json b/gokrazy/tsapp/config.json
new file mode 100644
index 000000000..6445eb89e
--- /dev/null
+++ b/gokrazy/tsapp/config.json
@@ -0,0 +1,24 @@
+{
+    "Hostname": "tsapp",
+    "Update": { "NoPassword": true },
+    "SerialConsole": "ttyS0,115200",
+    "Packages": [
+        "github.com/gokrazy/serial-busybox",
+        "github.com/gokrazy/breakglass",
+        "tailscale.com/cmd/tailscale",
+        "tailscale.com/cmd/tailscaled"
+    ],
+    "PackageConfig": {
+        "github.com/gokrazy/breakglass": {
+            "CommandLineFlags": [ "-authorized_keys=ec2" ]
+        },
+        "tailscale.com/cmd/tailscale": {
+            "ExtraFilePaths": {
+                "/usr": "usr-dir"
+            }
+        }
+    },
+    "KernelPackage": "github.com/tailscale/gokrazy-kernel",
+    "FirmwarePackage": "github.com/tailscale/gokrazy-kernel",
+    "InternalCompatibilityFlags": {}
+}
diff --git a/gokrazy/tsapp/usr-dir.tar b/gokrazy/tsapp/usr-dir.tar
new file mode 100644
index 000000000..6ef6cfbfd
Binary files /dev/null and b/gokrazy/tsapp/usr-dir.tar differ