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Add a bubblewrap backend for sandbox integrity checks - #51840
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## What changed Add Linux dependency discovery and policy preparation to `exec-server`'s sandbox integrity module. Inventory bundled and system `bwrap` candidates and the deny-glob scanner using the launcher's location and the command's `PATH` and working directory. Resolve `:tmpdir` and tilde-prefixed deny globs using the command's `TMPDIR` and `HOME`, with account home-directory fallback. Reuse Linux sandbox helpers to expand deny globs in the command's explicit environment. ## Testing Add Linux tests covering symlinked launchers, relative and empty `PATH` entries, and empty, relative, and tilde-prefixed `TMPDIR` values alongside home-relative deny globs. GitOrigin-RevId: fe404fa4be77ece677b22d52d77a7234dbf0cffe
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Add a bubblewrap backend for sandbox integrity checks
What changed
Add Linux dependency discovery and policy preparation to
exec-server's sandbox integrity module. Inventory bundled and systembwrapcandidates and the deny-glob scanner using the launcher's location and the command'sPATHand working directory.Resolve
:tmpdirand tilde-prefixed deny globs using the command'sTMPDIRandHOME, with account home-directory fallback. Reuse Linux sandbox helpers to expand deny globs in the command's explicit environment.Testing
Add Linux tests covering symlinked launchers, relative and empty
PATHentries, and empty, relative, and tilde-prefixedTMPDIRvalues alongside home-relative deny globs.