run: inline files for attached servers (#33317)

packages/opencode/src/cli/cmd/run.ts

@@ -1,4 +1,5 @@
 import type { PermissionV1 } from "@opencode-ai/core/v1/permission"
+import { FSUtil } from "@opencode-ai/core/fs-util"
 // CLI entry point for `opencode run`.
 //
 // Handles three modes:
@@ -15,6 +16,7 @@ import type { PermissionV1 } from "@opencode-ai/core/v1/permission"
 import type { Argv } from "yargs"
 import path from "path"
 import { pathToFileURL } from "url"
+import { open } from "node:fs/promises"
 import { Effect } from "effect"
 import { UI } from "../ui"
 import { effectCmd } from "../effect-cmd"
@@ -54,6 +56,8 @@ type FilePart = {
   mime: string
 }
 
+const ATTACH_FILE_MAX_BYTES = 10 * 1024 * 1024
+
 type Inline = {
   icon: string
   title: string
@@ -337,11 +341,48 @@ export const RunCommand = effectCmd({
             process.exit(1)
           }
 
-          const mime = (await Filesystem.isDir(resolvedPath)) ? "application/x-directory" : "text/plain"
+          const stat = Filesystem.stat(resolvedPath)
+          const isDirectory = stat?.isDirectory() ?? false
+          if (args.attach && isDirectory) {
+            UI.error(`Cannot attach local directory without a shared filesystem: ${filePath}`)
+            process.exit(1)
+          }
+
+          const content = await (async () => {
+            if (!args.attach) return
+            const handle = await open(resolvedPath, "r")
+            try {
+              const opened = await handle.stat()
+              if (!opened.isFile() || Number(opened.size) > ATTACH_FILE_MAX_BYTES) {
+                UI.error(`Cannot attach local file larger than 10 MiB or a special file: ${filePath}`)
+                process.exit(1)
+              }
+              if (opened.size === 0) return Buffer.alloc(0)
+              const buffer = Buffer.alloc(Number(opened.size))
+              let offset = 0
+              while (offset < buffer.length) {
+                const read = await handle.read(buffer, offset, buffer.length - offset, offset)
+                if (read.bytesRead === 0) break
+                offset += read.bytesRead
+              }
+              return buffer.subarray(0, offset)
+            } finally {
+              await handle.close()
+            }
+          })()
+          const detected = FSUtil.mimeType(resolvedPath)
+          const text = content?.toString("utf8")
+          const mime = !args.attach
+            ? isDirectory
+              ? "application/x-directory"
+              : "text/plain"
+            : content && text !== undefined && Buffer.from(text, "utf8").equals(content)
+              ? "text/plain"
+              : detected
 
           files.push({
             type: "file",
-            url: pathToFileURL(resolvedPath).href,
+            url: content ? `data:${mime};base64,${content.toString("base64")}` : pathToFileURL(resolvedPath).href,
             filename: path.basename(resolvedPath),
             mime,
           })