How vmup builds an SSH batch

vmup’s job is a single remote directory the agent can open. The original filenames on your laptop are not that directory. This page is the pipeline, not a recipe. Commands: Upload files.

Collect

Four inputs, one staging session:

1. Paths you passed, including one level of directory children.
2. Picker (no args).
3. Clipboard loop (--clip).
4. Folder watch (watch / --watch).

--clip and --watch cannot run together because both hold stdin.

SSH preflight starts as soon as the session exists, in parallel with collect. A long picker does not block the first ssh call. The result is awaited after collect, before upload.

Stage

A batch id is minted:

agents-YYYYMMDD-HHMMSS-<uuid>

Files are copied to ~/.cache/vmup/<batchId>/ and renamed image-NN, video-NN, file-NN. Counters are per kind, so two PDFs become file-01.pdf and file-02.pdf even if an image was staged between them.

The rename is deliberate. Agents get a stable listing: images together, then other files, instead of Screenshot 2026-09-11 at 2.01.28 PM.png mixed with notes (1).pdf. You lose the original basename on the VM. If you need the name, keep local staging (--keep-local) or send a manifest yourself.

Hidden junk is dropped at collect for directories and watch. Validate then applies size, count, and type rules.

Preflight

ssh runs mkdir -p <remote_dir> && test -d <remote_dir> && echo OK with a 20s timeout. Direct mode also checks the private key exists and is not group/world-readable.

Failure here keeps local staging and skips the upload. Exit 3.

Upload

Remote layout:

1. rm -rf the final dir and a sibling *.partial
2. mkdir the partial dir
3. Stream each staged file over ssh (cat > the remote path, local file on stdin) into <remote>/<batchId>.partial/
4. mv partial → final

Agents never see a half-written folder. A failed upload removes the partial dir. Local staging stays so you can look at what would have been sent.

Progress on a TTY:

⠋ Uploading 3 files  1.2 MB / 4.5 MB  4s

The right-hand size is the sum of local stats. The left-hand size is bytes ssh has accepted on stdin, including the current file, so a single large file ticks up during the transfer. JSON mode still animates stderr when it is a TTY.

After success

Local staging is deleted unless --keep-local.

vmup then:

1. Client delete: a detached sleep <ttlMinutes * 60> (minimum 60s) then ssh rm -rf the batch. This only runs while this process’s machine stays up.
2. Sweeper probe: test -x ~/vmup/.cleanup.sh. If missing, human mode warns.
3. Prompt: prompt_template with {{remote_path}} set to the final dir plus /.
4. Clipboard: clipboard_copy (prompt by default, or path, or none) via pbcopy / wl-copy / xclip. --json skips this.

To delete batches from this laptop without waiting: vmup prune (expired) or vmup prune --all (every agents-* dir). Recipes: Clean up batches.

The agent does not run vmup. You paste. The default sentence is Please inspect all files in <path>.

Ctrl+C during collect deletes staging and exits 130. After upload has started, interrupt handling is the default Node behavior plus whatever OpenSSH does; the partial-dir cleanup is on upload failure, not on SIGINT mid-transfer.