| """Implementation of uncachable_version_file.""" |
| |
| load(":py_internal.bzl", "py_internal") |
| |
| def _uncachable_version_file_impl(ctx): |
| version_file = ctx.actions.declare_file("uncachable_version_file.txt") |
| py_internal.copy_without_caching( |
| ctx = ctx, |
| # NOTE: ctx.version_file is undocumented; see |
| # https://github.com/bazelbuild/bazel/issues/9363 |
| # NOTE: Even though the version file changes every build (it contains |
| # the build timestamp), it is ignored when computing what inputs |
| # changed. See https://bazel.build/docs/user-manual#workspace-status |
| read_from = ctx.version_file, |
| write_to = version_file, |
| ) |
| return [DefaultInfo( |
| files = depset([version_file]), |
| )] |
| |
| uncachable_version_file = rule( |
| doc = """ |
| Creates a copy of `ctx.version_file`, except it isn't ignored by |
| Bazel's change-detecting logic. In fact, it's the opposite: |
| caching is disabled for the action generating this file, so any |
| actions depending on this file will always re-run. |
| """, |
| implementation = _uncachable_version_file_impl, |
| ) |
| |
| def define_uncachable_version_file(name): |
| native.alias( |
| name = name, |
| actual = select({ |
| ":stamp_detect": ":uncachable_version_file_impl", |
| "//conditions:default": ":sentinel", |
| }), |
| ) |
| uncachable_version_file(name = "uncachable_version_file_impl") |
