Ssh

Run commands, copy files, and open port forwards across a declared set of hosts over SSH. Define the hosts once on the model, then target any subset with a CEL expression ('"prod" in host.tags'), an explicit name list, or all. Every host runs in parallel and records its own result resource, so individual outcomes are auditable and workflows can gate on them.

OpenSSH targets reuse long-lived connections via ControlMaster; Tailscale SSH targets authenticate with tailnet identity and bypass multiplexing. Hosts can mix both transports in one fleet, and each host can override the fleet defaults (user, port, identity, proxy jump, auth mode, and more).

Highlights

• Define your fleet once via globalArguments.hosts[] — each host can override the fleet-default transport (kind, user, port, identity, etc.).
• Mix OpenSSH and Tailscale hosts in the same fleet.
• Per-host operations land as one resource each — run-<method>-<name> — so you can diff, gate workflows, and audit individual hosts.
• Three selector forms: "all", an explicit name list ["web-1"], or a bare CEL string evaluated per host (e.g. '"prod" in host.tags && host.attrs.region == "us-east-1"').
• CEL helpers bundled on every call: matchesRegex(s, pat), cidrContains(cidr, addr).
• Auth modes: key-based (file, agent, IdentityAgent) and password-based via sshpass -e with the password supplied through ${{ vault.get('<vault>', '<key>') }}.

Methods

Output capture

Captured by default, opt out at the fleet (captureOutput: false) or per call. No cap — stdout/stderr land verbatim in the matching run-<method>-<host> resource.

Requirements

• OpenSSH client (ssh, scp) on the runner.
• rsync if any copy call sets useRsync: true.
• tailscale if any host uses the tailscale transport.
• sshpass if any host uses auth.kind: password.
• The swamp host must expose ctx.createCelEnvironment() on the extension model context (introduced 2026-05).

Usage

swamp extension pull @swamp/ssh

# Create the fleet, then author its globalArguments (transport + hosts).
swamp model create @swamp/ssh awesome
swamp model edit awesome

# Run methods — every selector-taking method requires a `hosts` argument.
swamp model method run awesome open --input hosts=all --json
swamp model method run awesome exec \
  --input hosts='"prod" in host.tags' \
  --input command='uptime' --json

See the bundled README for the full configuration shape, transport options, authentication modes, and worked examples.