once build
Build a declared target
Synopsis
text
once build [OPTIONS] [TARGET]Description
Resolves the target id against the workspace graph, ensures every transitive dep is built first, and executes the target's build capability through the action cache. Targets that match a cached action key reuse the prior outputs; everything else runs and lands its declared outputs in <workspace>/.once/out/<target>/. Use once query targets to list available ids.
Arguments
| Argument | Required | Description |
|---|---|---|
<TARGET> | no | Target id, such as services/api/Api or ./Api |
Options
| Flag | Value | Default | Description |
|---|---|---|---|
--sandbox | <SANDBOX> | off | Local filesystem sandbox policy for command actions |
-C, --directory | <DIR> | Project root. Defaults to the current directory; the cache lives under <project>/.once/. Mirrors make -C | |
--format | <FORMAT> | human | Output format for Once's structured data (cache stats, run/exec trailers). Defaults to a human-readable rendering; pass json or toon to get machine-parseable output for scripting and for agent consumers |
-v, --verbose | (flag) | 0 | Increase log verbosity. Repeat for more (-v: info, -vv: debug, -vvv: trace). Overridden by RUST_LOG |
-q, --quiet | (flag) | false | Suppress human-mode success and progress trailers. Errors and the structured envelope of --format json/toon still print. Mirrors the -q flag of common build tools |
--list | (flag) | false | Print the command surface at the current command depth |