Fleet command

Loads an inventory from cobra4.toml (or programmatically), runs a command over each host in parallel, aggregates CommandResults. Demonstrates the Host / inventory / run(host=...) triad.

Source: examples/06_fleet.c4

# Fleet operations: load inventory and run a command on each host in parallel.
# In M3 the inventory is loaded from cobra4.toml; with no inventory present,
# we fall back to a synthetic local-only host to keep the example self-contained.

hosts = inventory("all")

# Fall back to a single localhost entry if no inventory file is present.
if len(hosts) == 0 {
    hosts = [Host(name="local", addr="localhost")]
}

results = each h in hosts in parallel(workers=4) { run("echo hello from {h.name}", host=h) }

ok = 0
for r in results {
    if r.ok {
        ok = ok + 1
        log("ok", host=r.host.name, out=r.stdout.strip())
    } else {
        log.warn("fail", host=r.host.name, code=r.returncode)
    }
}

log("fleet done", ok=ok, total=len(results))

Run it

c4 run examples/06_fleet.c4