feat: support readonly config and no docker sock

app/components/Notice.tsx

@@ -0,0 +1,16 @@
+import { InformationCircleIcon } from '@heroicons/react/24/outline'
+import clsx from 'clsx'
+import { type ReactNode } from 'react'
+
+export default function Notice({ children }: { readonly children: ReactNode }) {
+	return (
+		<div className={clsx(
+			'p-4 rounded-md w-fit flex items-center gap-3',
+			'bg-slate-400 dark:bg-slate-700'
+		)}
+		>
+			<InformationCircleIcon className='h-6 w-6 text-white'/>
+			{children}
+		</div>
+	)
+}

app/routes/_data.dns._index/domains.tsx

@@ -27,9 +27,11 @@ import TableList from '~/components/TableList'
 type Properties = {
 	readonly baseDomain?: string;
 	readonly searchDomains: string[];
+	// eslint-disable-next-line react/boolean-prop-naming
+	readonly disabled?: boolean;
 }
 
-export default function Domains({ baseDomain, searchDomains }: Properties) {
+export default function Domains({ baseDomain, searchDomains, disabled }: Properties) {
 	// eslint-disable-next-line unicorn/no-null, @typescript-eslint/ban-types
 	const [activeId, setActiveId] = useState<number | string | null>(null)
 	const [localDomains, setLocalDomains] = useState(searchDomains)
@@ -88,8 +90,14 @@ export default function Domains({ baseDomain, searchDomains }: Properties) {
 						strategy={verticalListSortingStrategy}
 					>
 						{localDomains.map((sd, index) => (
-							// eslint-disable-next-line react/no-array-index-key
-							<Domain key={index} domain={sd} id={index + 1} localDomains={localDomains}/>
+							<Domain
+								// eslint-disable-next-line react/no-array-index-key
+								key={index}
+								domain={sd}
+								id={index + 1}
+								localDomains={localDomains}
+								disabled={disabled}
+							/>
 						))}
 						<DragOverlay adjustScale>
 							{activeId ? <Domain
@@ -97,38 +105,41 @@ export default function Domains({ baseDomain, searchDomains }: Properties) {
 								domain={localDomains[activeId as number - 1]}
 								localDomains={localDomains}
 								id={activeId as number - 1}
+								disabled={disabled}
 							/> : undefined}
 						</DragOverlay>
 					</SortableContext>
-					<TableList.Item key='add-sd'>
-						<Input
-							variant='embedded'
-							type='text'
-							className='font-mono text-sm'
-							placeholder='Search Domain'
-							value={newDomain}
-							onChange={event => {
-								setNewDomain(event.target.value)
-							}}
-						/>
-						<Button
-							className='text-sm'
-							disabled={newDomain.length === 0}
-							onClick={() => {
-								fetcher.submit({
-								// eslint-disable-next-line @typescript-eslint/naming-convention
-									'dns_config.domains': [...localDomains, newDomain]
-								}, {
-									method: 'PATCH',
-									encType: 'application/json'
-								})
+					{disabled ? undefined : (
+						<TableList.Item key='add-sd'>
+							<Input
+								variant='embedded'
+								type='text'
+								className='font-mono text-sm'
+								placeholder='Search Domain'
+								value={newDomain}
+								onChange={event => {
+									setNewDomain(event.target.value)
+								}}
+							/>
+							<Button
+								className='text-sm'
+								disabled={newDomain.length === 0}
+								onClick={() => {
+									fetcher.submit({
+										// eslint-disable-next-line @typescript-eslint/naming-convention
+										'dns_config.domains': [...localDomains, newDomain]
+									}, {
+										method: 'PATCH',
+										encType: 'application/json'
+									})
 
-								setNewDomain('')
-							}}
-						>
-							Add
-						</Button>
-					</TableList.Item>
+									setNewDomain('')
+								}}
+							>
+								Add
+							</Button>
+						</TableList.Item>
+					)}
 				</TableList>
 			</DndContext>
 		</div>
@@ -140,9 +151,11 @@ type DomainProperties = {
 	readonly id: number;
 	readonly isDrag?: boolean;
 	readonly localDomains: string[];
+	// eslint-disable-next-line react/boolean-prop-naming
+	readonly disabled?: boolean;
 }
 
-function Domain({ domain, id, localDomains, isDrag }: DomainProperties) {
+function Domain({ domain, id, localDomains, isDrag, disabled }: DomainProperties) {
 	const fetcher = useFetcher()
 
 	const {
@@ -169,17 +182,20 @@ function Domain({ domain, id, localDomains, isDrag }: DomainProperties) {
 			}}
 		>
 			<p className='font-mono text-sm flex items-center gap-4'>
-				<Bars3Icon
-					className='h-4 w-4 text-gray-400 focus:outline-none'
-					{...attributes}
-					{...listeners}
-				/>
+				{disabled ? undefined : (
+					<Bars3Icon
+						className='h-4 w-4 text-gray-400 focus:outline-none'
+						{...attributes}
+						{...listeners}
+					/>
+				)}
 				{domain}
 			</p>
 			{isDrag ? undefined : (
 				<Button
 					variant='destructive'
 					className='text-sm'
+					disabled={disabled}
 					onClick={() => {
 						fetcher.submit({
 						// eslint-disable-next-line @typescript-eslint/naming-convention

app/routes/_data.dns._index/magic.tsx

@@ -7,9 +7,11 @@ import Button from '~/components/Button'
 
 type Properties = {
 	readonly isEnabled: boolean;
+	// eslint-disable-next-line react/boolean-prop-naming
+	readonly disabled?: boolean;
 }
 
-export default function Modal({ isEnabled }: Properties) {
+export default function Modal({ isEnabled, disabled }: Properties) {
 	const [isOpen, setIsOpen] = useState(false)
 	const fetcher = useFetcher()
 
@@ -18,6 +20,7 @@ export default function Modal({ isEnabled }: Properties) {
 			<Button
 				variant='emphasized'
 				className='w-fit text-sm'
+				disabled={disabled}
 				onClick={() => {
 					setIsOpen(true)
 				}}

app/routes/_data.dns._index/rename.tsx

@@ -10,9 +10,11 @@ import Input from '~/components/Input'
 
 type Properties = {
 	readonly name: string;
+	// eslint-disable-next-line react/boolean-prop-naming
+	readonly disabled?: boolean;
 }
 
-export default function Modal({ name }: Properties) {
+export default function Modal({ name, disabled }: Properties) {
 	const [isOpen, setIsOpen] = useState(false)
 	const [newName, setNewName] = useState(name)
 	const fetcher = useFetcher()
@@ -32,7 +34,7 @@ export default function Modal({ name }: Properties) {
 			</p>
 			<Input
 				readOnly
-				className='font-mono text-sm my-4'
+				className='font-mono text-sm my-4 w-1/2'
 				type='text'
 				value={name}
 				onFocus={event => {
@@ -42,6 +44,7 @@ export default function Modal({ name }: Properties) {
 			<Button
 				variant='emphasized'
 				className='text-sm w-fit'
+				disabled={disabled}
 				onClick={() => {
 					setIsOpen(true)
 				}}

app/routes/_data.dns._index/route.tsx

@@ -7,8 +7,9 @@ import { useState } from 'react'
 import Button from '~/components/Button'
 import Code from '~/components/Code'
 import Input from '~/components/Input'
+import Notice from '~/components/Notice'
 import TableList from '~/components/TableList'
-import { getConfig, patchConfig } from '~/utils/config'
+import { getConfig, getContext, patchConfig } from '~/utils/config'
 import { restartHeadscale } from '~/utils/docker'
 
 import Domains from './domains'
@@ -18,6 +19,8 @@ import RenameModal from './rename'
 // We do not want to expose every config value
 export async function loader() {
 	const config = await getConfig()
+	const context = await getContext()
+
 	const dns = {
 		prefixes: config.prefixes,
 		magicDns: config.dns_config.magic_dns,
@@ -29,10 +32,18 @@ export async function loader() {
 		extraRecords: config.dns_config.extra_records
 	}
 
-	return dns
+	return {
+		...dns,
+		...context
+	}
 }
 
 export async function action({ request }: ActionFunctionArgs) {
+	const context = await getContext()
+	if (!context.hasConfigWrite) {
+		return json({ success: false })
+	}
+
 	const data = await request.json() as Record<string, unknown>
 	await patchConfig(data)
 	await restartHeadscale()
@@ -47,7 +58,12 @@ export default function Page() {
 
 	return (
 		<div className='flex flex-col gap-16 max-w-screen-lg'>
-			<RenameModal name={data.baseDomain}/>
+			{data.hasConfigWrite ? undefined : (
+				<Notice>
+					The Headscale configuration is read-only. You cannot make changes to the configuration
+				</Notice>
+			)}
+			<RenameModal name={data.baseDomain} disabled={!data.hasConfigWrite}/>
 			<div className='flex flex-col w-2/3'>
 				<h1 className='text-2xl font-medium mb-4'>Nameservers</h1>
 				<p className='text-gray-700 dark:text-gray-300'>
@@ -63,6 +79,7 @@ export default function Page() {
 							<span className='text-sm opacity-50'>Override local DNS</span>
 							<Switch
 								checked={localOverride}
+								disabled={!data.hasConfigWrite}
 								className={clsx(
 									localOverride ? 'bg-gray-800' : 'bg-gray-200',
 									'relative inline-flex h-4 w-9 items-center rounded-full'
@@ -97,6 +114,7 @@ export default function Page() {
 								<Button
 									variant='destructive'
 									className='text-sm'
+									disabled={!data.hasConfigWrite}
 									onClick={() => {
 										fetcher.submit({
 											// eslint-disable-next-line @typescript-eslint/naming-convention
@@ -111,35 +129,37 @@ export default function Page() {
 								</Button>
 							</TableList.Item>
 						))}
-						<TableList.Item>
-							<Input
-								variant='embedded'
-								type='text'
-								className='font-mono text-sm'
-								placeholder='Nameserver'
-								value={ns}
-								onChange={event => {
-									setNs(event.target.value)
-								}}
-							/>
-							<Button
-								className='text-sm'
-								disabled={ns.length === 0}
-								onClick={() => {
-									fetcher.submit({
+						{data.hasConfigWrite ? (
+							<TableList.Item>
+								<Input
+									variant='embedded'
+									type='text'
+									className='font-mono text-sm'
+									placeholder='Nameserver'
+									value={ns}
+									onChange={event => {
+										setNs(event.target.value)
+									}}
+								/>
+								<Button
+									className='text-sm'
+									disabled={ns.length === 0}
+									onClick={() => {
+										fetcher.submit({
 										// eslint-disable-next-line @typescript-eslint/naming-convention
-										'dns_config.nameservers': [...data.nameservers, ns]
-									}, {
-										method: 'PATCH',
-										encType: 'application/json'
-									})
+											'dns_config.nameservers': [...data.nameservers, ns]
+										}, {
+											method: 'PATCH',
+											encType: 'application/json'
+										})
 
-									setNs('')
-								}}
-							>
-								Add
-							</Button>
-						</TableList.Item>
+										setNs('')
+									}}
+								>
+									Add
+								</Button>
+							</TableList.Item>
+						) : undefined}
 					</TableList>
 					{/* TODO: Split DNS and Custom A Records */}
 				</div>
@@ -148,6 +168,7 @@ export default function Page() {
 			<Domains
 				baseDomain={data.magicDns ? data.baseDomain : undefined}
 				searchDomains={data.searchDomains}
+				disabled={!data.hasConfigWrite}
 			/>
 
 			<div className='flex flex-col w-2/3'>
@@ -162,7 +183,7 @@ export default function Page() {
 					{' '}
 					when Magic DNS is enabled.
 				</p>
-				<MagicModal isEnabled={data.magicDns}/>
+				<MagicModal isEnabled={data.magicDns} disabled={!data.hasConfigWrite}/>
 			</div>
 		</div>
 	)

app/utils/config.ts

@@ -141,7 +141,6 @@ export async function patchConfig(partial: Record<string, unknown>) {
 }
 
 type Context = {
-	isDocker: boolean;
 	hasDockerSock: boolean;
 	hasConfigWrite: boolean;
 }
@@ -151,7 +150,6 @@ export let context: Context
 export async function getContext() {
 	if (!context) {
 		context = {
-			isDocker: await checkDocker(),
 			hasDockerSock: await checkSock(),
 			hasConfigWrite: await checkConfigWrite()
 		}
@@ -177,20 +175,9 @@ async function checkSock() {
 		return true
 	} catch {}
 
-	return false
-}
-
-async function checkDocker() {
-	try {
-		await stat('/.dockerenv')
-		return true
-	} catch {}
-
-	try {
-		const data = await readFile('/proc/self/cgroup', 'utf8')
-		return data.includes('docker')
-	} catch {}
+	if (!process.env.HEADSCALE_CONTAINER) {
+		return false
+	}
 
 	return false
 }
-

app/utils/docker.ts

@@ -5,9 +5,15 @@ import { setTimeout } from 'node:timers/promises'
 
 import { Client } from 'undici'
 
+import { getContext } from './config'
 import { pull } from './headscale'
 
 export async function restartHeadscale() {
+	const context = await getContext()
+	if (!context.hasDockerSock) {
+		return
+	}
+
 	if (!process.env.HEADSCALE_CONTAINER) {
 		throw new Error('HEADSCALE_CONTAINER is not set')
 	}