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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.
The Runfiles API is available from two sources, a direct Bazel target, and a pypi package.
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
Add the 'bazel-runfiles' dependency along with other third-party dependencies, for example in your requirements.txt
file.
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
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,
# ...
)
FAQs
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We found that bazel-runfiles demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
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