repository_ctx

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The context of the repository rule containing helper functions and information about attributes. You get a repository_ctx object as an argument to the implementation function when you create a repository rule.

Members

attr

struct repository_ctx.attr

A struct to access the values of the attributes. The values are provided by the user (if not, a default value is used).

delete

bool repository_ctx.delete(path)

Deletes a file or a directory. Returns a bool, indicating whether the file or directory was actually deleted by this call.

Parameters

Parameter Description
path string; or path; required
Path of the file to delete, relative to the repository directory, or absolute. Can be a path or a string.

download

unknown repository_ctx.download(url, output='', sha256='', executable=False, allow_fail=False, canonical_id='', auth={}, headers={}, *, integrity='', block=True)

Downloads a file to the output path for the provided url and returns a struct containing success, a flag which is true if the download completed successfully, and if successful, a hash of the file with the fields sha256 and integrity. When sha256 or integrity is user specified, setting an explicit canonical_id is highly recommended. e.g. get_default_canonical_id

Parameters

Parameter Description
url string; or Iterable of strings; required
List of mirror URLs referencing the same file.
output string; or Label; or path; default is ''
path to the output file, relative to the repository directory.
sha256 default is ''
The expected SHA-256 hash of the file downloaded. This must match the SHA-256 hash of the file downloaded. It is a security risk to omit the SHA-256 as remote files can change. At best omitting this field will make your build non-hermetic. It is optional to make development easier but should be set before shipping. If provided, the repository cache will first be checked for a file with the given hash; a download will only be attempted if the file was not found in the cache. After a successful download, the file will be added to the cache.
executable default is False
Set the executable flag on the created file, false by default.
allow_fail default is False
If set, indicate the error in the return value instead of raising an error for failed downloads.
canonical_id default is ''
If set, restrict cache hits to those cases where the file was added to the cache with the same canonical id. By default caching uses the checksum (sha256 or integrity).
auth default is {}
An optional dict specifying authentication information for some of the URLs.
headers default is {}
An optional dict specifying http headers for all URLs.
integrity default is ''
Expected checksum of the file downloaded, in Subresource Integrity format. This must match the checksum of the file downloaded. It is a security risk to omit the checksum as remote files can change. At best omitting this field will make your build non-hermetic. It is optional to make development easier but should be set before shipping. If provided, the repository cache will first be checked for a file with the given checksum; a download will only be attempted if the file was not found in the cache. After a successful download, the file will be added to the cache.
block default is True
If set to false, the call returns immediately and instead of the regular return value, it returns a token with one single method, wait(), which blocks until the download is finished and returns the usual return value or throws as usual.

download_and_extract

struct repository_ctx.download_and_extract(url, output='', sha256='', type='', stripPrefix='', allow_fail=False, canonical_id='', auth={}, headers={}, *, integrity='', rename_files={})

Downloads a file to the output path for the provided url, extracts it, and returns a struct containing success, a flag which is true if the download completed successfully, and if successful, a hash of the file with the fields sha256 and integrity. When sha256 or integrity is user specified, setting an explicit canonical_id is highly recommended. e.g. get_default_canonical_id

Parameters

Parameter Description
url string; or Iterable of strings; required
List of mirror URLs referencing the same file.
output string; or Label; or path; default is ''
Path to the directory where the archive will be unpacked, relative to the repository directory.
sha256 default is ''
The expected SHA-256 hash of the file downloaded. This must match the SHA-256 hash of the file downloaded. It is a security risk to omit the SHA-256 as remote files can change. At best omitting this field will make your build non-hermetic. It is optional to make development easier but should be set before shipping. If provided, the repository cache will first be checked for a file with the given hash; a download will only be attempted if the file was not found in the cache. After a successful download, the file will be added to the cache.
type default is ''
The archive type of the downloaded file. By default, the archive type is determined from the file extension of the URL. If the file has no extension, you can explicitly specify either "zip", "jar", "war", "aar", "nupkg", "tar", "tar.gz", "tgz", "tar.xz", "txz", ".tar.zst", ".tzst", "tar.bz2", ".tbz", ".ar", or ".deb" here.
stripPrefix default is ''
A directory prefix to strip from the extracted files. Many archives contain a top-level directory that contains all files in the archive. Instead of needing to specify this prefix over and over in the build_file, this field can be used to strip it from extracted files.
allow_fail default is False
If set, indicate the error in the return value instead of raising an error for failed downloads.
canonical_id default is ''
If set, restrict cache hits to those cases where the file was added to the cache with the same canonical id. By default caching uses the checksum" (sha256 or integrity).
auth default is {}
An optional dict specifying authentication information for some of the URLs.
headers default is {}
An optional dict specifying http headers for all URLs.
integrity default is ''
Expected checksum of the file downloaded, in Subresource Integrity format. This must match the checksum of the file downloaded. It is a security risk to omit the checksum as remote files can change. At best omitting this field will make your build non-hermetic. It is optional to make development easier but should be set before shipping. If provided, the repository cache will first be checked for a file with the given checksum; a download will only be attempted if the file was not found in the cache. After a successful download, the file will be added to the cache.
rename_files default is {}
An optional dict specifying files to rename during the extraction. Archive entries with names exactly matching a key will be renamed to the value, prior to any directory prefix adjustment. This can be used to extract archives that contain non-Unicode filenames, or which have files that would extract to the same path on case-insensitive filesystems.

execute

exec_result repository_ctx.execute(arguments, timeout=600, environment={}, quiet=True, working_directory="")

Executes the command given by the list of arguments. The execution time of the command is limited by timeout (in seconds, default 600 seconds). This method returns an exec_result structure containing the output of the command. The environment map can be used to override some environment variables to be passed to the process.

Parameters

Parameter Description
arguments required
List of arguments, the first element should be the path to the program to execute.
timeout default is 600
Maximum duration of the command in seconds (default is 600 seconds).
environment default is {}
Force some environment variables to be set to be passed to the process.
quiet default is True
If stdout and stderr should be printed to the terminal.
working_directory default is ""
Working directory for command execution. Can be relative to the repository root or absolute. The default is the repository root.

extract

None repository_ctx.extract(archive, output='', stripPrefix='', *, rename_files={}, watch_archive='auto')

Extract an archive to the repository directory.

Parameters

Parameter Description
archive string; or Label; or path; required
path to the archive that will be unpacked, relative to the repository directory.
output string; or Label; or path; default is ''
path to the directory where the archive will be unpacked, relative to the repository directory.
stripPrefix default is ''
a directory prefix to strip from the extracted files. Many archives contain a top-level directory that contains all files in the archive. Instead of needing to specify this prefix over and over in the build_file, this field can be used to strip it from extracted files.
rename_files default is {}
An optional dict specifying files to rename during the extraction. Archive entries with names exactly matching a key will be renamed to the value, prior to any directory prefix adjustment. This can be used to extract archives that contain non-Unicode filenames, or which have files that would extract to the same path on case-insensitive filesystems.
watch_archive default is 'auto'
whether to watch the archive file. Can be the string 'yes', 'no', or 'auto'. Passing 'yes' is equivalent to immediately invoking the watch() method; passing 'no' does not attempt to watch the file; passing 'auto' will only attempt to watch the file when it is legal to do so (see watch() docs for more information.

file

None repository_ctx.file(path, content='', executable=True, legacy_utf8=True)

Generates a file in the repository directory with the provided content.

Parameters

Parameter Description
path string; or Label; or path; required
Path of the file to create, relative to the repository directory.
content default is ''
The content of the file to create, empty by default.
executable default is True
Set the executable flag on the created file, true by default.
legacy_utf8 default is True
Encode file content to UTF-8, true by default. Future versions will change the default and remove this parameter.

getenv

string repository_ctx.getenv(name, default=None)

Returns the value of an environment variable name as a string if exists, or default if it doesn't.

When building incrementally, any change to the value of the variable named by name will cause this repository to be re-fetched.

Parameters

Parameter Description
name string; required
Name of desired environment variable.
default string; or None; default is None
Default value to return if name is not found.
May return None.

name

string repository_ctx.name

The name of the external repository created by this rule.

os

repository_os repository_ctx.os

A struct to access information from the system.

patch

None repository_ctx.patch(patch_file, strip=0, *, watch_patch='auto')

Apply a patch file to the root directory of external repository. The patch file should be a standard unified diff format file. The Bazel-native patch implementation doesn't support fuzz match and binary patch like the patch command line tool.

Parameters

Parameter Description
patch_file string; or Label; or path; required
The patch file to apply, it can be label, relative path or absolute path. If it's a relative path, it will resolve to the repository directory.
strip default is 0
Strip the specified number of leading components from file names.
watch_patch default is 'auto'
Whether to watch the patch file. Can be the string 'yes', 'no', or 'auto'. Passing 'yes' is equivalent to immediately invoking the watch() method; passing 'no' does not attempt to watch the file; passing 'auto' will only attempt to watch the file when it is legal to do so (see watch() docs for more information.

path

path repository_ctx.path(path)

Returns a path from a string, label or path. If the path is relative, it will resolve relative to the repository directory. If the path is a label, it will resolve to the path of the corresponding file. Note that remote repositories are executed during the analysis phase and thus cannot depends on a target result (the label should point to a non-generated file). If path is a path, it will return that path as is.

Parameters

Parameter Description
path string; or Label; or path; required
string, Label or path from which to create a path from.

read

string repository_ctx.read(path, *, watch='auto')

Reads the content of a file on the filesystem.

Parameters

Parameter Description
path string; or Label; or path; required
Path of the file to read from.
watch default is 'auto'
Whether to watch the file. Can be the string 'yes', 'no', or 'auto'. Passing 'yes' is equivalent to immediately invoking the watch() method; passing 'no' does not attempt to watch the file; passing 'auto' will only attempt to watch the file when it is legal to do so (see watch() docs for more information.

report_progress

None repository_ctx.report_progress(status='')

Updates the progress status for the fetching of this repository or module extension.

Parameters

Parameter Description
status string; default is ''
string describing the current status of the fetch progress. 

None repository_ctx.symlink(target, link_name)

Creates a symlink on the filesystem.

Parameters

Parameter Description
target string; or Label; or path; required
The path that the symlink should point to.
string; or Label; or path; required
The path of the symlink to create.

template

None repository_ctx.template(path, template, substitutions={}, executable=True, *, watch_template='auto')

Generates a new file using a template. Every occurrence in template of a key of substitutions will be replaced by the corresponding value. The result is written in path. An optional executable argument (default to true) can be set to turn on or off the executable bit.

Parameters

Parameter Description
path string; or Label; or path; required
Path of the file to create, relative to the repository directory.
template string; or Label; or path; required
Path to the template file.
substitutions default is {}
Substitutions to make when expanding the template.
executable default is True
Set the executable flag on the created file, true by default.
watch_template default is 'auto'
Whether to watch the template file. Can be the string 'yes', 'no', or 'auto'. Passing 'yes' is equivalent to immediately invoking the watch() method; passing 'no' does not attempt to watch the file; passing 'auto' will only attempt to watch the file when it is legal to do so (see watch() docs for more information.

watch

None repository_ctx.watch(path)

Tells Bazel to watch for changes to the given path, whether or not it exists, or whether it's a file or a directory. Any changes to the file or directory will invalidate this repository or module extension, and cause it to be refetched or re-evaluated next time.

"Changes" include changes to the contents of the file (if the path is a file); if the path was a file but is now a directory, or vice versa; and if the path starts or stops existing. Notably, this does not include changes to any files under the directory if the path is a directory. For that, use path.readdir() instead.

Note that attempting to watch paths inside the repo currently being fetched, or inside the working directory of the current module extension, will result in an error. A module extension attempting to watch a path outside the current Bazel workspace will also result in an error.

Parameters

Parameter Description
path string; or Label; or path; required
Path of the file to watch.

watch_tree

None repository_ctx.watch_tree(path)

Tells Bazel to watch for changes to any files or directories transitively under the given path. Any changes to the contents of files, the existence of files or directories, file names or directory names, will cause this repo to be refetched.

Note that attempting to watch paths inside the repo currently being fetched will result in an error.

Parameters

Parameter Description
path string; or Label; or path; required
Path of the directory tree to watch.

which

path repository_ctx.which(program)

Returns the path of the corresponding program or None if there is no such program in the path.

Parameters

Parameter Description
program required
Program to find in the path.
May return None.

workspace_root

path repository_ctx.workspace_root

The path to the root workspace of the bazel invocation.