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bxl

This document provides an overview of the commands and options available under buck2 bxl.

buck2 bxl​

Run BXL scripts

Usage: buck2 bxl [OPTIONS] <BXL label> [-- <BXL INPUT ARGS>...]

Arguments:​

  • <BXL label> The bxl function to execute as defined by the label of form &lt;cell&gt;//path/file.bxl:&lt;function&gt;

  • <BXL INPUT ARGS> Arguments passed to the bxl script

Options:​

  • -M, --materializations <MATERIALIZATIONS> Materialize (or skip) the final artifacts, bypassing buckconfig.

    • Possible values:
      • all
      • none

  • --upload-final-artifacts <UPLOAD_FINAL_ARTIFACTS> Upload (or skip) the final artifacts.

    • Possible values:
      • always
      • never

  • --user-event-log <PATH> Write user events to this log file. Both user and internal events are written to main event log. If this flag is specified, user events are additionally written to user event log. Log format is JSONL, uncompressed if no known extensions are detected, or you can explicitly specify the compression via the file extension (ex: .json-lines.gz would be gzip compressed, .json-lines.zst would be zstd compressed). Resulting log is is compatible with buck2 log show-user

  • --build-report <PATH> Print a build report

    --build-report=- will print the build report to stdout --build-report=&lt;filepath&gt; will write the build report to the file

  • --enable-optional-validations <VALIDATION_NAMES> Comma separated list of validation names to run that are marked optional.

    By default, validations marked as optional are skipped. This option overrides the behaviour and executes those validations.

  • --build-report-options <BUILD_REPORT_OPTIONS> Comma separated list of build report options.

    The following options are supported:

    fill-out-failures: fill out failures the same way Buck1 would.

    package-project-relative-paths: emit the project-relative path of packages for the targets that were built.

  • -j, --num-threads <THREADS> Number of threads to use during execution (default is # cores)

  • --local-only Enable only local execution. Will reject actions that cannot execute locally

  • --remote-only Enable only remote execution. Will reject actions that cannot execute remotely

  • --prefer-local Enable hybrid execution. Will prefer executing actions that can execute locally on the local host

  • --prefer-remote Enable hybrid execution. Will prefer executing actions that can execute remotely on RE and will avoid racing local and remote execution

  • --unstable-no-execution Experimental: Disable all execution

  • --no-remote-cache Do not perform remote cache queries or cache writes. If remote execution is enabled, the RE service might still deduplicate actions, so for e.g. benchmarking, using a random isolation dir is preferred

  • --write-to-cache-anyway Could be used to enable the action cache writes on the RE worker when no_remote_cache is specified

  • --eager-dep-files Process dep files when they are generated (i.e. after running a command that produces dep files), rather than when they are used (i.e. before re-running a command that previously produced dep files). Use this when debugging commands that produce dep files. Note that commands that previously produced dep files will not re-run: only dep files produced during this command will be eagerly loaded

  • --upload-all-actions Uploads every action to the RE service, regardless of whether the action needs to execute on RE.

    This is useful when debugging builds and trying to inspect actions which executed remotely. It's possible that the action result is cached but the action itself has expired. In this case, downloading the action itself would fail. Enabling this option would unconditionally upload all actions, thus you will not hit any expiration issues.

  • --fail-fast If Buck hits an error, do as little work as possible before exiting.

    To illustrate the effect of this flag, consider an invocation of build :foo :bar. The default behavior of buck is to do enough work to get a result for the builds of each of :foo and :bar, and no more. This means that buck will continue to complete the build of :bar after the build of :foo has failed; however, once one dependency of :foo has failed, other dependencies will be cancelled unless they are needed by :bar.

    This flag changes the behavior of buck to not wait on :bar to complete once :foo has failed. Generally, this flag only has an effect on builds that specify multiple targets.

    --keep-going changes the behavior of buck to not only wait on :bar once one dependency of :foo has failed, but to additionally attempt to build other dependencies of :foo if possible.

  • --keep-going If Buck hits an error, continue doing as much work as possible before exiting.

    See --fail-fast for more details.

  • --skip-missing-targets If target is missing, then skip building instead of throwing error

  • --skip-incompatible-targets If target is incompatible with the specified configuration, skip building instead of throwing error. This does not apply to targets specified with glob patterns /... or : which are skipped unconditionally

  • --materialize-failed-inputs Materializes inputs for failed actions which ran on RE

  • --materialize-failed-outputs Materializes outputs (if present) for failed actions which ran on RE

  • --target-platforms <PLATFORM> Configuration target (one) to use to configure targets

  • -m, --modifier <VALUE> A configuration modifier to configure all targets on the command line. This may be a constraint value target.

  • -c, --config <SECTION.OPTION=VALUE> List of config options

  • --config-file <PATH> List of config file paths

  • --fake-host <HOST>

    • Possible values:
      • default
      • linux
      • macos
      • windows

  • --fake-arch <ARCH>

    • Possible values:
      • default
      • aarch64
      • x8664

  • --fake-xcode-version <VERSION-BUILD> Value must be formatted as: version-build (e.g., 14.3.0-14C18 or 14.1-14B47b)

  • --reuse-current-config Re-uses any --config values (inline or via modefiles) if there's a previous command, otherwise the flag is ignored.

    If there is a previous command and --reuse-current-config is set, then the old config is used, ignoring any overrides.

    If there is no previous command but the flag was set, then the flag is ignored, the command behaves as if the flag was not set at all.

  • --exit-when-different-state Used for exiting a concurrent command when a different state is detected

  • --preemptible <PREEMPTIBLE> Used to configure when this command could be preempted by another command for the same isolation dir.

    Normally, when you run two commands - from different terminals, say - buck2 will attempt to run them in parallel. However, if the two commands are based on different state, that is they either have different configs or different filesystem states, buck2 cannot run them in parallel. The default behavior in this case is to block the second command until the first completes.

    • Possible values:
      • never: (default) When another command starts that cannot run in parallel with this one, block that command
      • always: When another command starts, interrupt this command, even if they could run in parallel. There is no good reason to use this other than that it provides slightly nicer superconsole output
      • ondifferentstate: When another command starts that cannot run in parallel with this one, interrupt this command

  • --disable-starlark-types Disable runtime type checking in Starlark interpreter.

    This option is not stable, and can be used only locally to diagnose evaluation performance problems.

  • --stack Record or show target call stacks.

    Starlark call stacks will be included in duplicate targets error.

    If a command outputs targets (like targets command), starlark call stacks will be printed after the targets.

  • --console <super|simple|...> Which console to use for this command

    • Default value: auto
    • Possible values:
      • auto
      • none
      • simple
      • simplenotty
      • simpletty
      • super

  • --ui <UI> Configure additional superconsole ui components.

    Accepts a comma-separated list of superconsole components to add. Possible values are:

    dice - shows information about evaluated dice nodes debugevents - shows information about the flow of events from buckd

    These components can be turned on/off interactively. Press 'h' for help when superconsole is active.

    • Possible values:
      • dice
      • debugevents
      • io: I/O panel
      • re: RE panel

  • --no-interactive-console Disable console interactions

  • --event-log <PATH> Write events to this log file

  • --write-build-id <PATH> Write command invocation id into this file

  • --unstable-write-invocation-record <PATH> Write the invocation record (as JSON) to this path. No guarantees whatsoever are made regarding the stability of the format

  • --command-report-path <PATH> Write the command report to this path. A command report is always written to buck-out/v2/&lt;uuid&gt;/command_report even without this flag