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Make FileSystemUtils.moveFile always preserve symlinks and use it in …
…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 bazelbuild#4987. Change-Id: I0283e8aa11fadff5b0afd7bdfd0490aca12a1f6b
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