This release is a pre-release and may not be stable for production use.
bazel-runfiles library
This is a Bazel Runfiles lookup library for Bazel-built Python binaries and tests.
Learn about runfiles: read Runfiles guide or watch Fabian's BazelCon talk.
Importing
The Runfiles API is available from two sources, a direct Bazel target, and a pypi package.
Pure Bazel imports
-
Depend on this runfiles library from your build rule, like you would other third-party libraries:
py_binary( name = "my_binary", # ... deps = ["@rules_python//python/runfiles"], )
-
Import the runfiles library:
from python.runfiles import Runfiles
Pypi imports
-
Add the 'bazel-runfiles' dependency along with other third-party dependencies, for example in your
requirements.txtfile. -
Depend on this runfiles library from your build rule, like you would other third-party libraries:
load("@pip_deps//:requirements.bzl", "requirement") py_binary( name = "my_binary", ... deps = [requirement("bazel-runfiles")], )
-
Import the runfiles library:
from runfiles import Runfiles
Typical Usage
Create a Runfiles object and use Rlocation to look up runfile paths:
r = Runfiles.Create()
# ...
with open(r.Rlocation("my_workspace/path/to/my/data.txt"), "r") as f:
contents = f.readlines()
# ...
Here my_workspace is the name you specified via module(name = "...") in your MODULE.bazel file (with --enable_bzlmod, default as of Bazel 7) or workspace(name = "...") in WORKSPACE (with --noenable_bzlmod).
The code above creates a manifest- or directory-based implementation based on the environment variables in os.environ. See Runfiles.Create() for more info.
If you want to explicitly create a manifest- or directory-based implementation, you can do so as follows:
r1 = Runfiles.CreateManifestBased("path/to/foo.runfiles_manifest")
r2 = Runfiles.CreateDirectoryBased("path/to/foo.runfiles/")
If you want to start subprocesses that access runfiles, you have to set the right environment variables for them:
import subprocess
from python.runfiles import Runfiles
r = Runfiles.Create()
env = {}
# ...
env.update(r.EnvVars())
p = subprocess.run(
[r.Rlocation("path/to/binary")],
env=env,
# ...
)
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