add volume remount

src/mounts.js

@@ -6,6 +6,7 @@ exports = module.exports = {
     removeMount,
     validateMountOptions,
     getStatus,
+    remount
 };
 
 const assert = require('assert'),
@@ -21,6 +22,7 @@ const assert = require('assert'),
 
 const ADD_MOUNT_CMD = path.join(__dirname, 'scripts/addmount.sh');
 const RM_MOUNT_CMD = path.join(__dirname, 'scripts/rmmount.sh');
+const REMOUNT_MOUNT_CMD = path.join(__dirname, 'scripts/remountmount.sh');
 const SYSTEMD_MOUNT_EJS = fs.readFileSync(path.join(__dirname, 'systemd-mount.ejs'), { encoding: 'utf8' });
 
 // https://man7.org/linux/man-pages/man8/mount.8.html
@@ -184,3 +186,14 @@ async function tryAddMount(mount, options) {
         throw new BoxError(BoxError.MOUNT_ERROR, `Failed to mount (${status.state}): ${status.message}`);
     }
 }
+
+async function remount(mount) {
+    assert.strictEqual(typeof mount, 'object'); // { name, hostPath, mountType, mountOptions }
+
+    if (mount.mountType === 'mountpoint') return;
+
+    if (constants.TEST) return;
+
+    const [error] = await safe(shell.promises.sudo('remountMount', [ REMOUNT_MOUNT_CMD, mount.hostPath ], {}));
+    if (error && error.code === 2) throw new BoxError(BoxError.MOUNT_ERROR, 'Failed to remount existing mount'); // at this point, the old mount config is still there
+}