fix(deploy): discover workspace source via container inspect (not mountinfo)

scripts/deploy-via-docker.js

@@ -19,6 +19,15 @@ const fs = require('fs');
 const SOCKET = '/var/run/docker.sock';
 const HOST_STATIC = '/data/www/userbase';
 const HELPER_IMAGE = 'node:20'; // already cached on host (used by the job)
+const WS_MOUNT = '/workspace/admin/userbase';
+
+// The job container's ID, derived from its cgroup (robust regardless of hostname).
+function getContainerId() {
+  const cg = fs.readFileSync('/proc/self/cgroup', 'utf8');
+  const m = cg.match(/[0-9a-f]{64}/);
+  if (!m) throw new Error('cannot determine container id from cgroup');
+  return m[0];
+}
 
 function dockerReq(method, path, bodyObj) {
   return new Promise((resolve, reject) => {
@@ -42,29 +51,28 @@ function dockerReq(method, path, bodyObj) {
   });
 }
 
-// Locate the host path backing the workspace mountpoint (a docker volume _data dir).
-function findWorkspaceSource(mountpoint) {
-  const txt = fs.readFileSync('/proc/self/mountinfo', 'utf8');
-  for (const line of txt.split('\n')) {
-    const parts = line.trim().split(/\s+/);
-    if (parts.length < 5) continue;
-    const mp = parts[4];
-    if (mp === mountpoint || mp.endsWith(mountpoint)) {
-      const dash = parts.indexOf('-');
-      if (dash !== -1 && parts.length > dash + 2) {
-        return parts[dash + 2];
-      }
+// Locate the host path backing the workspace mount by inspecting THIS container
+// via the Docker daemon (docker.sock). This is far more reliable than parsing
+// /proc/self/mountinfo (which reports the underlying block device, not the bind
+// source). The job container's hostname is its short ID.
+async function findWorkspaceSource() {
+  const id = getContainerId();
+  const r = await dockerReq('GET', `/containers/${id}/json`);
+  if (r.status >= 400) {
+    throw new Error('inspect self failed: ' + r.status + ' ' + r.body);
+  }
+  const info = JSON.parse(r.body);
+  const mounts = info.Mounts || [];
+  for (const m of mounts) {
+    if (m.Destination === WS_MOUNT) {
+      return m.Source; // host path of the docker volume _data dir
     }
   }
-  return null;
+  throw new Error('workspace mount ' + WS_MOUNT + ' not found in container inspect');
 }
 
 async function main() {
-  const wsMount = '/workspace/admin/userbase';
-  const wsSource = findWorkspaceSource(wsMount);
-  if (!wsSource) {
-    throw new Error('Could not find workspace source in /proc/self/mountinfo');
-  }
+  const wsSource = await findWorkspaceSource();
   console.log('workspace source (host path):', wsSource);
 
   // Inside the helper, the workspace is bound at /src (see Binds below).