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SandboxedSpawn.copyOutputs.
Previously, if moveFile fell back to copying from a true rename (e.g., if the
move is across file systems), it would fully dereference the source and produce
a regular file at the output location. This CL fixes moveFile to properly copy
symlinks. Note we don't preserve metadata in the symlink case mostly because the
Bazel VFS has no API to write metadata without dereferencing symlinks. (But,
also, it's not important for the current use cases.)
This breaks the backward-compatibility of FileSystemUtils.moveFile and
FileSystemUtils.moveTreeBelow. This seems okay because the new behavior makes
more sense, and sandbox is the only consumer of these APIs.
Switching SandboxedSpawn.copyOutputs to use FileSystemUtils.moveFile rather than
Guava's Files.move fixes https://github.com/bazelbuild/bazel/issues/4987.
Closes #4989.
Change-Id: I0283e8aa11fadff5b0afd7bdfd0490aca12a1f6b
PiperOrigin-RevId: 192611227
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PiperOrigin-RevId: 191642942
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- The number of stat() syscalls in the SymlinkedSandboxedSpawn was way too high. Do less, feel better.
- When using --experimental_sandbox_base, ensure that symlinks in the path are resolved. Before this, you had to check whether on your system /dev/shm is a symlink to /run/shm and then use that instead. Now it no longer matters, as symlinks are resolved.
- Remove an unnecessary directory creation from each sandboxed invocation. Turns out that the "tmpdir" that we created was no longer used after some changes to Bazel's TMPDIR handling.
- Use simpler sandbox paths, by using the unique ID for each Spawn provided by SpawnExecutionPolicy instead of a randomly generated temp folder name. This also saves a round-trip from our VFS to NIO and back. Clean up the sandbox base before each build to ensure that the unique IDs are actually unique. ;)
- Use Java 8's Process#isAlive to check whether a process is alive instead of trying to get the exitcode and catching an exception.
Closes #4913.
PiperOrigin-RevId: 190472170
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RELNOTES: None.
PiperOrigin-RevId: 190062172
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- Make use of existing abstractions like SpawnRunner and SpawnExecutionPolicy.
- Instead of having the *Strategy create a *Runner, and then call back into
SandboxStrategy, create a single SandboxContainer which contains the full
command line, environment, and everything needed to create and delete the
sandbox directory.
- Do all the work in SandboxStrategy, including creation and deletion of the
sandbox directory.
- Use SpawnResult instead of throwing, catching, and rethrowing.
- Simplify the control flow a bit.
PiperOrigin-RevId: 161644979
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Benjamin Peterson
dannark
Philipp Wollermann
jmmv
ulfjack