utargets

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

buck2 utargets

Show details about the specified targets.

This command is meant to only handle unconfigured targets, but for historical reasons, with certain flags it can also work with configured targets.

Usage: buck2 utargets [OPTIONS] [TARGET_PATTERNS]...

Arguments:

• <TARGET_PATTERNS> Patterns to interpret

Options:

• --json Print targets as JSON

• --json-lines Print targets as JSON-lines

• --stats Print statistics of how many entries were processed

• --resolve-alias Print the fully-qualified build target for the specified aliases

• --show-target-hash Print a stable hash of each target after the target name

• --show-unconfigured-target-hash Print a stable unconfigured hash of each target after the target name

• --target-hash-file-mode <TARGET_HASH_FILE_MODE> Modifies computation of target hashes. If set to PATHS_AND_CONTENTS (the default), the contents of all files referenced from the targets will be used to compute the target hash. If set to PATHS_ONLY, only files' paths contribute to the hash. If set to NONE no files will be used. See also --target-hash-modified-paths

  • Default value: paths_and_contents
  • Possible values:
    • paths_only
    • paths_and_contents
    • none

• --target-hash-modified-paths <TARGET_HASH_MODIFIED_PATHS> Modifies computation of target hashes. Only effective when --target-hash-file-mode is set to PATHS_ONLY. If a target or its dependencies reference a file from this set, the target's hash will be different than if this option was omitted. Otherwise, the target's hash will be the same as if this option was omitted

• --target-hash-function <TARGET_HASH_FUNCTION> Selects either the "fast" or the "strong" target hash function to be used for computing target hashes. While we don't specify the exact algorithm, the "strong" algorithm should be a reasonable cryptographic hash (ex. blake3) while the "fast" function will likely be a non-crypto hash. Both functions are guaranteed to be deterministic and to have the same value across different platforms/architectures

  • Default value: fast
  • Possible values:
    • sha1
    • sha256
    • murmur-hash3
    • fast
    • strong

• --target-hash-recursive <TARGET_HASH_RECURSIVE> When true, emit the hash or target node and all dependencies recursively. When false, hash only the target node

  • Default value: true
  • Possible values:
    • true
    • false

• -A, --output-all-attributes Output all attributes, equivalent of --output-attribute ''.

  Avoid using this flag in automation because it may be expensive to produce certain attributes, and because it makes harder to track which special attributes are used.

• -B, --output-basic-attributes Output basic attributes, namely those the user can supply, plus rule type and package name

• -a, --output-attribute <ATTRIBUTE> Regular expressions to match attributes. Regular expressions are used in "search" mode, so for example empty string matches all attributes including special attributes.

  When using in automation, please specify the regular expression to match the attribute precisely, for example --output-attribute '^headers$' to make it easier to track which special attributes are used.

• --output-attributes <ATTRIBUTE> Deprecated: Use --output-attribute instead.

  List of space-separated attributes to output, --output-attributes attr1 attr2.

• --include-defaults Enables printing of default attributes. This would be attributes in a target that aren't explicitly set in the target but instead use the default set in the rule declaration

• --show-output Print the path to the output for each of the rules relative to the project root

• --show-full-output Print the absolute path to the output for each of the rules

• --show-simple-output Print only the path to the output for each of the rules relative to the project root

• --show-full-simple-output Print only the absolute path to the output for each of the rules

• --show-json-output Print the output paths relative to the project root, in JSON format

• --show-full-json-output Print the output absolute paths, in JSON format

• --keep-going On loading errors, put buck.error in the output stream and continue

• --streaming Write output as soon as it is available. The order of the output items is non-deterministic and if multiple patterns cover the same target, may have duplicates

• --no-cache Don't cache the target information on the build graph

• --imports Show the imports of each package/import. Shows an additional output per package/import (not per target), including implicit dependencies (e.g. the prelude) but only direct dependencies (not the transitive closure)

• --package-values Show the package values. Produces an additional attribute representing all the package values for the package containing the target

• --package-values-regex <VALUES> Regular expressions to match package values. Produces an additional attribute representing package values for the package containing the target. Regular expressions are used in "search" mode so, for example, empty string matches all package values

• -o, --output <PATH> File to put the output in, rather than sending to stdout.

  File will be created if it does not exist, and overwritten if it does.

• --compression <SCHEME> Compress the output

  • Default value: none
  • Possible values:
    • none
    • gzip
    • zstd

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

• --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/<uuid>/command_report even without this flag