defunkt/sandlot
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Make hostMounts sync, drop readonly mounts

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This commit is contained in:
Chris Wanstrath 2026-02-24 23:44:22 -08:00
parent 1382f55964
commit 65603df7d2
1 changed files with 13 additions and 13 deletions
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26
src/vm.ts
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@ -1,4 +1,5 @@
import { $ } from "bun"
import { existsSync } from "fs"
import { homedir } from "os"
import { dirname, join } from "path"
import { getApiKey } from "./env.ts"
@ -47,20 +48,19 @@ async function run(cmd: ReturnType<typeof $>, step: string): Promise<void> {
// ── create() helpers (internal) ──────────────────────────────────────
/** Check which host source directories exist. */
async function hostMounts(home: string): Promise<{ dev: boolean; code: boolean }> {
const [dev, code] = await Promise.all([
Bun.file(`${home}/dev`).exists().catch(() => false),
Bun.file(`${home}/code`).exists().catch(() => false),
])
return { dev, code }
function hostMounts(home: string): { dev: boolean; code: boolean } {
return {
dev: existsSync(`${home}/dev`),
code: existsSync(`${home}/code`),
}
}
/** Pull the image and start the container in detached mode. */
async function createContainer(home: string): Promise<void> {
const mounts = await hostMounts(home)
const mounts = hostMounts(home)
const args = ["container", "run", "-d", "--name", CONTAINER_NAME, "-m", "4G"]
if (mounts.dev) args.push("--mount", `type=bind,source=${home}/dev,target=/host/dev,readonly`)
if (mounts.code) args.push("--mount", `type=bind,source=${home}/code,target=/host/code,readonly`)
if (mounts.dev) args.push("--mount", `type=bind,source=${home}/dev,target=/host/dev`)
if (mounts.code) args.push("--mount", `type=bind,source=${home}/code,target=/host/code`)
args.push("-v", `${home}/.sandlot:/sandlot`, "ubuntu:24.04", "sleep", "infinity")
const prepared = DEBUG ? $`${args}`.nothrow() : $`${args}`.nothrow().quiet()
const result = await prepared
@ -83,7 +83,7 @@ async function installPackages(cached: boolean): Promise<void> {
/** Create symlinks so git worktree absolute paths from the host resolve inside the container. */
async function createHostSymlinks(home: string): Promise<void> {
const mounts = await hostMounts(home)
const mounts = hostMounts(home)
const cmds = [`mkdir -p '${home}'`, `ln -s /sandlot '${home}/.sandlot'`]
if (mounts.dev) cmds.push(`ln -s /host/dev '${home}/dev'`)
if (mounts.code) cmds.push(`ln -s /host/code '${home}/code'`)
@ -268,13 +268,13 @@ export async function status(): Promise<"running" | "stopped" | "missing"> {
/** Launch claude in the container at the given workdir. */
export async function claude(workdir: string, opts?: { prompt?: string; print?: string; continue?: boolean }): Promise<{ exitCode: number; output?: string }> {
const cwd = containerPath(workdir)
const mounts = await hostMounts(homedir())
const mounts = hostMounts(homedir())
const systemPromptLines = [
"You are running inside a sandlot container (Apple Container, ubuntu:24.04).",
`Your working directory is ${cwd}, a git worktree managed by sandlot.`,
]
if (mounts.dev) systemPromptLines.push("The host's ~/dev is mounted read-only at /host/dev.")
if (mounts.code) systemPromptLines.push("The host's ~/code is mounted read-only at /host/code.")
if (mounts.dev) systemPromptLines.push("The host's ~/dev is mounted at /host/dev.")
if (mounts.code) systemPromptLines.push("The host's ~/code is mounted at /host/code.")
systemPromptLines.push(
"The host's ~/.sandlot is mounted at /sandlot.",
"Bun is installed at ~/.local/bin/bun. Use bun instead of node/npm.",