West Release Notes


Major changes:

  • New west grep command for running a “grep tool” in your west workspace’s repositories. Currently, git grep, ripgrep, and standard grep are supported grep tools.

    To run this command to get git grep foo results from all cloned, active repositories, run:

    west grep foo

    Here are some other examples for running different grep commands with west grep:

    git grep --untracked

    west grep --untracked foo


    west grep --tool ripgrep foo

    grep --recursive

    west grep --tool grep foo

    To switch the default grep tool in your workspace, run the appropriate command in this table:


    west config grep.tool ripgrep


    west config grep.tool grep

    For more details, run west help grep.

Other changes:

  • The manifest file format now supports a description field in each projects: element. See Projects for examples.

  • west list --format now accepts {description} in the format string, which prints the project’s description: value.

  • west compare now always prints information about The manifest-rev branch.

Bug fixes:

  • west init aborts if the destination directory already exists.

API changes:

  • west.commands.WestCommand methods check_call() and check_output() now take any kwargs that can be passed on to the underlying subprocess function.

  • west.commands.WestCommand.run_subprocess(): new wrapper around subprocess.run(). This could not be named run() because WestCommand already had a method by this name.

  • west.commands.WestCommand methods dbg(), inf(), wrn(), and err() now all take an end kwarg, which is passed on to the call to print().

  • west.manifest.Project now has a description attribute, which contains the parsed value of the description: field in the manifest data.


Major changes:

  • west compare: new command that compares the state of the workspace against the manifest.

  • Support for a new manifest.project-filter configuration option. See Built-in Configuration Options for details. The west manifest --freeze and west manifest --resolve commands currently cannot be used when this option is set. This restriction can be removed in a later release.

  • Project names which contain comma (,) or whitespace now generate warnings. These warnings are errors if the new manifest.project-filter configuration option is set. The warnings may be promoted to errors in a future major version of west.

Other changes:

  • west forall now takese a --group argument that can be used to restrict the command to only run in one or more groups. Run west help forall for details.

  • All west commands will now output log messages from west API modules at warning level or higher. In addition, the --verbose argument to west can be used once to include informational messages, or twice to include debug messages, from all commands.

Bug fixes:

  • Various improvements to error messages, debug logging, and error handling.

API changes:

  • west.manifest.Manifest.is_active() now respects the manifest.project-filter configuration option’s value.


Major changes:

  • Manifest schema version “1.0” is now available for use in this release. This is identical to the “0.13” schema version in terms of features, but can be used by applications that do not wish to use a “0.x” manifest “version:” field. See Version for details on this feature.

Bug fixes:

  • West no longer exits with a successful error code when sent an interrupt signal. Instead, it exits with a platform-specific error code and signals to the calling environment that the process was interrupted.


Major changes in this release:

  • The West APIs are now declared stable. Any breaking changes will be communicated by a major version bump from v1.x.y to v2.x.y.

  • West v1.0 no longer works with the Zephyr v1.14 LTS releases. This LTS has long been obsoleted by Zephyr v2.7 LTS. If you need to use Zephyr v1.14, you must use west v0.14 or earlier.

  • Like the rest of Zephyr, west now requires Python v3.8 or later

  • West commands no longer accept abbreviated command line arguments. For example, you must now specify west update --keep-descendants instead of using an abbreviation like west update --keep-d. This is part of a change applied to all of Zephyr’s Python scripts’ command-line interfaces. The abbreviations were causing problems in practice when commands were updated to add new options with similar names but different behavior to existing ones.

Other changes:

  • All built-in west functions have stopped using west.log

  • west update: new --submodule-init-config option. See commit 9ba92b05 for details.

Bug fixes:

  • West extension commands that failed to load properly sometimes dumped stack. This has been fixed and west now prints a sensible error message in this case.

  • west config now fails on malformed configuration option arguments which lack a . in the option name

API changes:

  • The west package now contains the metadata files necessary for some static analyzers (such as mypy) to auto-detect its type annotations. See commit d9f00e24 for details.

  • the deprecated west.build module used for Zephyr v1.14 LTS compatibility was removed

  • the deprecated west.cmake module used for Zephyr v1.14 LTS compatibility was removed

  • the west.log module is now deprecated. This module uses global state, which can make it awkward to use it as an API which multiple different python modules may rely on.

  • The west.commands module got some new APIs which lay groundwork for a future change to add a global verbosity control to a command’s output, and work to remove global state from the west package’s API:

    • New west.commands.WestCommand.__init__() keyword argument: verbosity

    • New west.commands.WestCommand property: color_ui

    • New west.commands.WestCommand methods, which should be used to print output from extension commands instead of writing directly to sys.stdout or sys.stderr: inf(), wrn(), err(), die(), banner(), small_banner()

    • New west.commands.VERBOSITY enum


Bug fixes:

  • West commands that were run with a bad local configuration file dumped stack in a confusing way. This has been fixed and west now prints a sensible error message in this case.

  • A bug in the way west looks for the zephyr repository was fixed. The bug itself usually appeared when running an extension command like west build in a new workspace for the first time; this used to fail (just for the first time, not on subsequent command invocations) unless you ran the command in the workspace’s top level directory.

  • West now prints sensible error messages when the user lacks permission to open the manifest file instead of dumping stack traces.

API changes:

  • The west.manifest.MalformedConfig exception type has been moved to the west.configuration module

  • The west.manifest.MalformedConfig exception type has been moved to the west.configuration module

  • The west.configuration.Configuration class now raises MalformedConfig instead of RuntimeError in some cases


Bug fix:

  • When calling west.manifest.Manifest.from_file() when outside of a workspace, west again falls back on the ZEPHYR_BASE environment variable to locate the workspace.


New features:

  • You can now associate arbitrary user data with the manifest repository itself in the manifest: self: userdata: value, like so:

        userdata: <any YAML value can go here>

Bug fixes:

  • The path to the manifest repository reported by west could be incorrect in certain circumstances detailed in [issue #572](https://github.com/zephyrproject-rtos/west/issues/572). This has been fixed as part of a larger overhaul of path handling support in the west.manifest API module.

  • The west.Manifest.ManifestProject.__repr__ return value was fixed

API changes:

  • west.configuration.Configuration: new object-oriented interface to the current configuration. This reflects the system, global, and workspace-local configuration values, and allows you to read, write, and delete configuration options from any or all of these locations.

  • west.commands.WestCommand:

    • config: new attribute, returns a Configuration object or aborts the program if none is set. This is always usable from within extension command do_run() implementations.

    • has_config: new boolean attribute, which is True if and only if reading self.config will abort the program.

  • The path handling in the west.manifest package has been overhauled in a backwards-incompatible way. For more details, see commit [56cfe8d1d1](https://github.com/zephyrproject-rtos/west/commit/56cfe8d1d1f3c9b45de3e793c738acd62db52aca).

  • west.manifest.Manifest.validate(): this now returns the validated data as a Python dict. This can be useful if the value passed to this function was a str, and the dict is desired.

  • west.manifest.Manifest: new:

    • path attributes abspath, posixpath, relative_path, yaml_path, repo_path, repo_posixpath

    • userdata attribute, which contains the parsed value from manifest: self: userdata:, or is None

    • from_topdir() factory method

  • west.manifest.ManifestProject: new userdata attribute, which also contains the parsed value from manifest: self: userdata:, or is None

  • west.manifest.ManifestImportFailed: the constructor can now take any value; this can be used to reflect failed imports from a map or other compound value.

  • Deprecated configuration APIs:

    The following APIs are now deprecated in favor of using a Configuration object. Usually this will be done via self.config from a WestCommand instance, but this can be done directly by instantiating a Configuration object for other usages.

    • west.configuration.config

    • west.configuration.read_config

    • west.configuration.update_config

    • west.configuration.delete_config


New features:

  • West now works on the MSYS2 platform.

  • West manifest files can now contain arbitrary user data associated with each project. See Repository user data for details.

Bug fixes:

  • The west list command’s {sha} format key has been fixed for the manifest repository; it now prints N/A (“not applicable”) as expected.

API changes:

  • The west.manifest.Project.userdata attribute was added to support project user data.


New features:

  • west status now only prints output for projects which have a nonempty status.

Bug fixes:

  • The manifest file parser was incorrectly allowing project names which contain the path separator characters / and \. These invalid characters are now rejected.

    Note: if you need to place a project within a subdirectory of the workspace topdir, use the path: key. If you need to customize a project’s fetch URL relative to its remote url-base:, use repo-path:. See Projects for examples.

  • The changes made in west v0.10.1 to the west init --manifest-rev option which selected the default branch name were leaving the manifest repository in a detached HEAD state. This has been fixed by using git clone internally instead of git init and git fetch. See issue #522 for details.

  • The WEST_CONFIG_LOCAL environment variable now correctly overrides the default location, <workspace topdir>/.west/config.

  • west update --fetch=smart (smart is the default) now correctly skips fetches for project revisions which are lightweight tags (it already worked correctly for annotated tags; only lightweight tags were unnecessarily fetched).

Other changes:

  • The fix for issue #522 mentioned above introduces a new restriction. The west init --manifest-rev option value, if given, must now be either a branch or a tag. In particular, “pseudo-branches” like GitHub’s pull/1234/head references which could previously be used to fetch a pull request can no longer be passed to --manifest-rev. Users must now fetch and check out such revisions manually after running west init.

API changes:

  • west.manifest.Manifest.get_projects() avoids incorrect results in some edge cases described in issue #523.

  • west.manifest.Project.sha() now works correctly for tag revisions. (This applies to both lightweight and annotated tags.)


New features:

  • west update now supports --narrow, --name-cache, and --path-cache options. These can be influenced by the update.narrow, update.name-cache, and update.path-cache Configuration options. These can be used to optimize the speed of the update.

  • west update now supports a --fetch-opt option that will be passed to the git fetch command used to fetch remote revisions when updating each project.

Bug fixes:

  • west update now synchronizes Git submodules in projects by default. This avoids issues if the URL changes in the manifest file from when the submodule was first initialized. This behavior can be disabled by setting the update.sync-submodules configuration option to false.

Other changes:

  • the west.manifest module has fixed docstrings for the Project class


New features:

  • The west init command’s --manifest-rev (--mr) option no longer defaults to master. Instead, the command will query the repository for its default branch name and use that instead. This allows users to move from master to main without breaking scripts that do not provide this option.


New features:

Bug fixes:

  • West now checks that the manifest schema version is one of the explicitly allowed values documented in Version. The old behavior was just to check that the schema version was newer than the west version where the manifest: version: key was introduced. This incorrectly allowed invalid schema versions, like 0.8.2.

Other changes:

  • A manifest file’s group-filter is now propagated through an import. This is a change from how west v0.9.x handled this. In west v0.9.x, only the top level manifest file’s group-filter had any effect; the group filter lists from any imported manifests were ignored.

    Starting with west v0.10.0, the group filter lists from imported manifests are also imported. For details, see Group Filters and Imports.

    The new behavior will take effect if manifest: version: is not given or is at least 0.10. The old behavior is still available in the top level manifest file only with an explicit manifest: version: 0.9. See Version for more information on schema versions.

    See west pull request #482 for the motivation for this change and additional context.


Bug fixes:

  • Commands like west manifest --resolve now correctly include group and group filter information.

Other changes:

  • West now warns if you combine import with group-filter. Semantics for this combination have changed starting with v0.10.x. See the v0.10.0 release notes above for more information.



The west config fix described below comes at a cost: any comments or other manual edits in configuration files will be removed when setting a configuration option via that command or the west.configuration API.


Combining the group-filter feature introduced in this release with manifest imports is discouraged. The resulting behavior has changed in west v0.10.

New features:

  • West manifests now support Git Submodules in Projects. This allows you to clone Git submodules into a west project repository in addition to the project repository itself.

  • West manifests now support Project Groups. Project groups can be enabled and disabled to determine what projects are “active”, and therefore will be acted upon by the following commands: west update, west list, west diff, west status, west forall.

  • west update no longer updates inactive projects by default. It now supports a --group-filter option which allows for one-time modifications to the set of enabled and disabled project groups.

  • Running west list, west diff, west status, or west forall with no arguments does not print information for inactive projects by default. If the user specifies a list of projects explicitly at the command line, output for them is included regardless of whether they are active.

    These commands also now support --all arguments to include all projects, even inactive ones.

  • west list now supports a {groups} format string key in its --format argument.

Bug fixes:

  • The west config command and west.configuration API did not correctly store some configuration values, such as strings which contain commas. This has been fixed; see commit 36f3f91e for details.

  • A manifest file with an empty manifest: self: path: value is invalid, but west used to let it pass silently. West now rejects such manifests.

  • A bug affecting the behavior of the west init -l . command was fixed; see issue #435.

API changes:

  • added west.manifest.Manifest.is_active()

  • added west.manifest.Manifest.group_filter

  • added submodules attribute to west.manifest.Project, which has newly added type west.manifest.Submodule

Other changes:

  • The Manifest Imports feature now supports the terms allowlist and blocklist instead of whitelist and blacklist, respectively.

    The old terms are still supported for compatibility, but the documentation has been updated to use the new ones exclusively.


This is a feature release which changes the manifest schema by adding support for a path-prefix: key in an import: mapping, along with some other features and fixes.

  • Manifest import mappings now support a path-prefix: key, which places the project and its imported repositories in a subdirectory of the workspace. See Example 3.4: Import into a subdirectory for an example.

  • The west command line application can now also be run using python3 -m west. This makes it easier to run west under a particular Python interpreter without modifying the PATH environment variable.

  • west manifest –path prints the absolute path to west.yml

  • west init now supports an --mf foo.yml option, which initializes the workspace using foo.yml instead of west.yml.

  • west list now prints the manifest repository’s path using the manifest.path configuration option, which may differ from the self: path: value in the manifest data. The old behavior is still available, but requires passing a new --manifest-path-from-yaml option.

  • Various Python API changes; see West APIs for details.


This is a bugfix release.


This is a bugfix and minor feature release.

  • Filter out duplicate extension commands brought in by manifest imports

  • Fix west.Manifest.get_projects() when finding the manifest repository by path


This is a bugfix and minor feature release.

  • west update --stats now prints timing for operations which invoke a subprocess, time spent in west’s Python process for each project, and total time updating each project.

  • west topdir always prints a POSIX style path

  • minor console output changes


The main user-visible feature in west 0.7 is the Manifest Imports feature. This allows users to load west manifest data from multiple different files, resolving the results into a single logical manifest.

Additional user-visible changes:

  • The idea of a “west installation” has been renamed to “west workspace” in this documentation and in the west API documentation. The new term seems to be easier for most people to work with than the old one.

  • West manifests now support a schema version.

  • The “west config” command can now be run outside of a workspace, e.g. to run west config --global section.key value to set a configuration option’s value globally.

  • There is a new west topdir command, which prints the root directory of the current west workspace.

  • The west -vv init command now prints the git operations being performed, and their results.

  • The restriction that no project can be named “manifest” is now enforced; the name “manifest” is reserved for the manifest repository, and is usable as such in commands like west list manifest, instead of west list path-to-manifest-repository being the only way to say that

  • It’s no longer an error if there is no project named “zephyr”. This is part of an effort to make west generally usable for non-Zephyr use cases.

  • Various bug fixes.

The developer-visible changes to the West APIs are:

  • west.build and west.cmake: deprecated; this is Zephyr-specific functionality and should never have been part of west. Since Zephyr v1.14 LTS relies on it, it will continue to be included in the distribution, but will be removed when that version of Zephyr is obsoleted.

  • west.commands:

    • WestCommand.requires_installation: deprecated; use requires_workspace instead

    • WestCommand.requires_workspace: new

    • WestCommand.has_manifest: new

    • WestCommand.manifest: this is now settable

  • west.configuration: callers can now identify the workspace directory when reading and writing configuration files

  • west.log:

    • msg(): new

  • west.manifest:

    • The module now uses the standard logging module instead of west.log

    • QUAL_REFS_WEST: new


    • Defaults: removed

    • Manifest.as_dict(): new

    • Manifest.as_frozen_yaml(): new

    • Manifest.as_yaml(): new

    • Manifest.from_file() and from_data(): these factory methods are more flexible to use and less reliant on global state

    • Manifest.validate(): new

    • ManifestImportFailed: new

    • ManifestProject: semi-deprecated and will likely be removed later.

    • Project: the constructor now takes a topdir argument

    • Project.format() and its callers are removed. Use f-strings instead.

    • Project.name_and_path: new

    • Project.remote_name: new

    • Project.sha() now captures stderr

    • Remote: removed

West now requires Python 3.6 or later. Additionally, some features may rely on Python dictionaries being insertion-ordered; this is only an implementation detail in CPython 3.6, but it is part of the language specification as of Python 3.7.


This point release fixes an error in the behavior of the deprecated west.cmake module.


This point release fixes an error in the behavior of west update --fetch=smart, introduced in v0.6.1.

All v0.6.1 users must upgrade.



Do not use this point release. Make sure to use v0.6.2 instead.

The user-visible features in this point release are:

  • The west update command has a new --fetch command line flag and update.fetch configuration option. The default value, “smart”, skips fetching SHAs and tags which are available locally.

  • Better and more consistent error-handling in the west diff, west status, west forall, and west update commands. Each of these commands can operate on multiple projects; if a subprocess related to one project fails, these commands now continue to operate on the rest of the projects. All of them also now report a nonzero error code from the west process if any of these subprocesses fails (this was previously not true of west forall in particular).

  • The west manifest command also handles errors better.

  • The west list command now works even when the projects are not cloned, as long as its format string only requires information which can be read from the manifest file. It still fails if the format string requires data stored in the project repository, e.g. if it includes the {sha} format string key.

  • Commands and options which operate on git revisions now accept abbreviated SHAs. For example, west init --mr SHA_PREFIX now works. Previously, the --mr argument needed to be the entire 40 character SHA if it wasn’t a branch or a tag.

The developer-visible changes to the West APIs are:

  • west.log.banner(): new

  • west.log.small_banner(): new

  • west.manifest.Manifest.get_projects(): new

  • west.manifest.Project.is_cloned(): new

  • west.commands.WestCommand instances can now access the parsed Manifest object via a new self.manifest property during the do_run() call. If read, it returns the Manifest object or aborts the command if it could not be parsed.

  • west.manifest.Project.git() now has a capture_stderr kwarg


  • No separate bootstrapper

    In west v0.5.x, the program was split into two components, a bootstrapper and a per-installation clone. See Multiple Repository Management in the v1.14 documentation for more details.

    This is similar to how Google’s Repo tool works, and lets west iterate quickly at first. It caused confusion, however, and west is now stable enough to be distributed entirely as one piece via PyPI.

    From v0.6.x onwards, all of the core west commands and helper classes are part of the west package distributed via PyPI. This eliminates complexity and makes it possible to import west modules from anywhere in the system, not just extension commands.

  • The selfupdate command still exists for backwards compatibility, but now simply exits after printing an error message.

  • Manifest syntax changes

    • A west manifest file’s projects elements can now specify their fetch URLs directly, like so:

          - name: example-project-name
            url: https://github.com/example/example-project

      Project elements with url attributes set in this way may not also have remote attributes.

    • Project names must be unique: this restriction is needed to support future work, but was not possible in west v0.5.x because distinct projects may have URLs with the same final pathname component, like so:

          - name: remote-1
            url-base: https://github.com/remote-1
          - name: remote-2
            url-base: https://github.com/remote-2
          - name: project
            remote: remote-1
            path: remote-1-project
          - name: project
            remote: remote-2
            path: remote-2-project

      These manifests can now be written with projects that use url instead of remote, like so:

          - name: remote-1-project
            url: https://github.com/remote-1/project
          - name: remote-2-project
            url: https://github.com/remote-2/project
  • The west list command now supports a {sha} format string key

  • The default format string for west list was changed to "{name:12} {path:28} {revision:40} {url}".

  • The command west manifest --validate can now be run to load and validate the current manifest file, among other error-handling fixes related to manifest parsing.

  • Incompatible API changes were made to west’s APIs. Further changes are expected until API stability is declared in west v1.0.

    • The west.manifest.Project constructor’s remote and defaults positional arguments are now kwargs. A new url kwarg was also added; if given, the Project URL is set to that value, and the remote kwarg is ignored.

    • west.manifest.MANIFEST_SECTIONS was removed. There is only one section now, namely manifest. The sections kwargs in the west.manifest.Manifest factory methods and constructor were also removed.

    • The west.manifest.SpecialProject class was removed. Use west.manifest.ManifestProject instead.


West v0.5.x is the first version used widely by the Zephyr Project as part of its v1.14 Long-Term Support (LTS) release. The west v0.5.x documentation is available as part of the Zephyr’s v1.14 documentation.

West’s main features in v0.5.x are:

  • Multiple repository management using Git repositories, including self-update of west itself

  • Hierarchical configuration files

  • Extension commands

Versions Before v0.5.x

Tags in the west repository before v0.5.x are prototypes which are of historical interest only.