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60 lines
3.9 KiB
Python
60 lines
3.9 KiB
Python
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"Helpers for copy rules"
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# Hints for Bazel spawn strategy
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COPY_EXECUTION_REQUIREMENTS = {
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# ----------------+-----------------------------------------------------------------------------
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# no-remote | Prevents the action or test from being executed remotely or cached remotely.
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# | This is equivalent to using both `no-remote-cache` and `no-remote-exec`.
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# ----------------+-----------------------------------------------------------------------------
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# no-remote-cache | Results in the action or test never being cached remotely (but it may
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# | be cached locally; it may also be executed remotely). Note: for the purposes
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# | of this tag, the disk-cache is considered a local cache, whereas the http
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# | and gRPC caches are considered remote. If a combined cache is specified
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# | (i.e. a cache with local and remote components), it's treated as a remote
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# | cache and disabled entirely unless --incompatible_remote_results_ignore_disk
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# | is set in which case the local components will be used.
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# ----------------+-----------------------------------------------------------------------------
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# no-remote-exec | Results in the action or test never being executed remotely (but it may be
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# | cached remotely).
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# ----------------+-----------------------------------------------------------------------------
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# no-cache | Results in the action or test never being cached (remotely or locally)
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# ----------------+-----------------------------------------------------------------------------
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# no-sandbox | Results in the action or test never being sandboxed; it can still be cached
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# | or run remotely - use no-cache or no-remote to prevent either or both of
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# | those.
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# ----------------+-----------------------------------------------------------------------------
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# local | Precludes the action or test from being remotely cached, remotely executed,
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# | or run inside the sandbox. For genrules and tests, marking the rule with the
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# | local = True attribute has the same effect.
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# ----------------+-----------------------------------------------------------------------------
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# See https://bazel.google.cn/reference/be/common-definitions?hl=en&authuser=0#common-attributes
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#
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# Copying file & directories is entirely IO-bound and there is no point doing this work
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# remotely.
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#
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# Also, remote-execution does not allow source directory inputs, see
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# https://github.com/bazelbuild/bazel/commit/c64421bc35214f0414e4f4226cc953e8c55fa0d2 So we must
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# not attempt to execute remotely in that case.
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#
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# There is also no point pulling the output file or directory from the remote cache since the
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# bytes to copy are already available locally. Conversely, no point in writing to the cache if
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# no one has any reason to check it for this action.
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#
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# Read and writing to disk cache is disabled as well primarily to reduce disk usage on the local
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# machine. A disk cache hit of a directory copy could be slghtly faster than a copy since the
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# disk cache stores the directory artifact as a single entry, but the slight performance bump
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# comes at the cost of heavy disk cache usage, which is an unmanaged directory that grow beyond
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# the bounds of the physical disk.
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# TODO: run benchmarks to measure the impact on copy_directory
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#
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# Sandboxing for this action is wasteful as well since there is a 1:1 mapping of input
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# file/directory to output file/directory and no room for non-hermetic inputs to sneak in to the
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# input.
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"no-remote": "1",
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"no-remote-cache": "1",
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"no-remote-exec": "1",
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"no-cache": "1",
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"no-sandbox": "1",
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"local": "1",
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}
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