Support optional ~/Code mount alongside ~/dev

src/vm.ts

@@ -18,6 +18,9 @@ export function containerPath(hostPath: string): string {
   if (hostPath.startsWith(`${home}/dev`)) {
     return "/host" + hostPath.slice(`${home}/dev`.length)
   }
+  if (hostPath.startsWith(`${home}/Code`)) {
+    return "/host-code" + hostPath.slice(`${home}/Code`.length)
+  }
   return hostPath
 }
 
@@ -41,11 +44,28 @@ 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 }
+}
+
 /** Pull the image and start the container in detached mode. */
 async function createContainer(home: string): Promise<void> {
-  await run(
+  const mounts = await hostMounts(home)
-    $`container run -d --name ${CONTAINER_NAME} -m 4G --mount type=bind,source=${home}/dev,target=/host,readonly -v ${home}/.sandlot:/sandlot ubuntu:24.04 sleep infinity`,
+  const args = ["container", "run", "-d", "--name", CONTAINER_NAME, "-m", "4G"]
-    "Container creation")
+  if (mounts.dev) args.push("--mount", `type=bind,source=${home}/dev,target=/host,readonly`)
+  if (mounts.code) args.push("--mount", `type=bind,source=${home}/Code,target=/host-code,readonly`)
+  args.push("-v", `${home}/.sandlot:/sandlot`, "ubuntu:24.04", "sleep", "infinity")
+  const result = await $`${args}`.nothrow().quiet()
+  if (result.exitCode !== 0) {
+    const stderr = result.stderr.toString().trim()
+    const stdout = result.stdout.toString().trim()
+    throw new Error(`Container creation failed (exit ${result.exitCode}):\n${stderr || stdout || "(no output)"}`)
+  }
 }
 
 /** Install base system packages (as root). */
@@ -60,8 +80,12 @@ 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 cmds = [`mkdir -p '${home}'`, `ln -s /sandlot '${home}/.sandlot'`]
+  if (mounts.dev) cmds.push(`ln -s /host '${home}/dev'`)
+  if (mounts.code) cmds.push(`ln -s /host-code '${home}/Code'`)
   await run(
-    $`container exec ${CONTAINER_NAME} bash -c ${`mkdir -p '${home}' && ln -s /host '${home}/dev' && ln -s /sandlot '${home}/.sandlot'`}`,
+    $`container exec ${CONTAINER_NAME} bash -c ${cmds.join(" && ")}`,
     "Symlink creation")
 }
 
@@ -240,13 +264,17 @@ 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 systemPromptLines = [
     "You are running inside a sandlot container (Apple Container, ubuntu:24.04).",
     `Your working directory is ${cwd}, a git worktree managed by sandlot.`,
-    "The host's ~/dev is mounted read-only at /host.",
+  ]
+  if (mounts.dev) systemPromptLines.push("The host's ~/dev is mounted read-only at /host.")
+  if (mounts.code) systemPromptLines.push("The host's ~/Code is mounted read-only 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.",
-  ]
+  )
   if (opts?.print) {
     systemPromptLines.push("IMPORTANT: Do not use plan mode. Do not call the EnterPlanMode tool. Proceed directly with the task.")
   }