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Add support for tree artifacts (ctx.action.declare_directory(...)) in
runfiles. Before this change we would throw away the information
about the files inside a tree artifact before executing an action.
That's fine for local execution where the sandbox just copies/symlinks
a directory and doesn't care much what's inside. However, in remote
execution we actually need to upload each individual file and so
we need to be aware of all individual files not just directories.
This change makes it so that this information is made available to a
SpawnRunner via the SpawnInputExpander.
RELNOTES: None
PiperOrigin-RevId: 207091668
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(minor) ActionFS now implements MetadataProvider.getInput
PiperOrigin-RevId: 199575194
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The goal is to, for an action execution, make only a single skyframe
edge to every required runfiles tree rather than an edge to every
runfiles artifact directly. We accomplish this by pulling the runfiles
artifacts' metadata for a particular runfiles tree through the
appropriate runfiles middlemen artifact in one batch. This CL fixes
https://github.com/bazelbuild/bazel/issues/3217.
This change makes runfiles middlemen more similar to aggregating
middlemen. We however continue to treat runfiles middlemen slightly
differently than true aggregating middlemen. Namely, we do not expand
runfiles middlemen into the final action inputs. The reasons for this
are:
1. It can make latent bugs like
https://github.com/bazelbuild/bazel/issues/4033 more severe.
2. The runfiles tree builder action's output MANIFEST contains
absolute paths, which interferes with remote execution if its metadata
is added to a cache hash.
3. In the sandbox, it causes the runfiles artifacts to be mounted at
their exec path locations in addition to within the runfiles
trees. This makes the sandbox less strict. (Perhaps tolerably?)
4. It saves a modicum of (transient) memory and time to not expand.
If the first two issues are fixed, it could be a nice simplification
to completely replace runfiles middlemen with aggregating middlemen.
Change-Id: I2d2148297f897af4c4c6dc055d87f8a6fad0061e
PiperOrigin-RevId: 198307109
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buchgr
shahan
Benjamin Peterson