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fix(op): give the sandbox a private copy of non-extracted sources - #2234
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A non-extracted Source resolves to the download cache's own file, and it was hardlinked into the build's writable /build: a build that appended to its input changed the cached source (reproduced from inside a real build sandbox, build-servers#231). The cache re-hashes on every hit, so later builds re-download, but a concurrent build of the same source reads the changed bytes. Map it as FileCopy, as Local files already are. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Check name Status Explanation Title check The title clearly and concisely describes the main change: mapping non-extracted sources as private sandbox copies. It follows the required Conventional Commit format. Description check The description explains the bug, impact, implementation, compatibility rationale, testing performed, and related issue. It does not use the template headings or include the checklist explicitly, but … Linked Issues check Check skipped because no linked issues were found for this pull request. Out of Scope Changes check Check skipped because no linked issues were found for this pull request. Full details: Description check
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The description explains the bug, impact, implementation, compatibility rationale, testing performed, and related issue. It does not use the template headings or include the checklist explicitly, but it contains the required substantive information.
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Approved: every review thread resolved at @bryan-minimal resolved the last thread, which releases the approval this review had withheld. Nothing to do. |
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correctness
minimal-review — approved
Verdict APPROVE — No findings.
security
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Verdict APPROVE — No findings.
supply-chain
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Verdict COMMENT — 1 finding, 1 inline.
Panel: 3 of 3 personas ran (correctness, security, supply-chain).
FileCopy used fs::copy, which truncates an existing destination. Two non-extracted sources with one basename silently kept the second, and a destination already hardlinked in from a mapped directory shares that source's inode, so the copy rewrote the source in place. copy_input_file creates the copy with create_new: on a collision it keeps the first and warns, as the hardlinked File input does. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Actionable comments posted: 1
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Inline comments:
Review comments at @crates/sandbox/src/lib.rs:
- Around line 2747-2767: Update Config::build to retain the build_base_dir path
while calling Sandbox::new, and remove that directory if construction returns an
error before returning the result. Preserve the existing successful construction
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crates/op/src/specs.rscrates/sandbox/src/lib.rs
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minimal-review — approved
Verdict APPROVE — every review thread is resolved; @bryan-minimal closed the last one. The review of 517e6c624cb1 withheld this approval on the threads open then.
norrietaylor
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Oct 19, 2026
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…dict (#2720) T104, NET-155. A box's package builds run in the box's classifier leaf, or for an own-address box on a task network of the box's own, so the box's egress verdict decides their connections. That covers build and materialize side operations, launch builds, in-box installs, patched builds and task runs. A box whose launch placed it in a leaf refuses a build, task or check when the leaf is gone, so a build never runs outside the verdict. A build the box's rules refuse names the destination and the box, and each build start logs the box, package and leaf. A box with no leaf and no own address builds in the daemon's cgroup as node-plane traffic, as before, and logs that it does. Backport of #2720. Adapted to the line: - box_actor/setup.rs hunks land in session.rs, box_ops.rs is session_sop.rs, and the tests land in session/tests.rs, with super::setup:: read as super::, a Record literal of the line's fields, and local rewrite_record and read_record helpers. - boxes, sandbox and box_manager read sessions, sandbox2 and sessions, and crate::traced becomes tokio::spawn and tokio::task::spawn_blocking. - mctx keeps the line's build_graph body, without main's dangling-hit replan, and only gains the local_orchestrator call that carries the leaf. Dropped: main's session_id on the env channel, which T104 only carried as context, the dangling-hit test in op/src/patched.rs, and the test for #2234 in op/src/specs.rs, which comes with #2234 below. (cherry picked from commit a26f89b)
norrietaylor
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Nov 4, 2026
) A non-extracted Source resolves to the download cache's own file, and it was hardlinked into the build's writable /build, so a build that appended to its input changed the cached source. It is now mapped as FileCopy, as Local files already are. FileCopy no longer truncates an existing destination: copy_input_file creates with create_new, and on a collision it keeps the first file and warns, as the hardlinked File input does. Backport of #2234. Adapted to the line: the sandbox hunk lands in sandbox2, and the new test's SpecBuild names T104's classifier_leaf and box_network fields. (cherry picked from commit 13aaa43)
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norrietaylor
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Nov 5, 2026
…dict (#2720) T104, NET-155. A box's package builds run in the box's classifier leaf, or for an own-address box on a task network of the box's own, so the box's egress verdict decides their connections. That covers build and materialize side operations, launch builds, in-box installs, patched builds and task runs. A box whose launch placed it in a leaf refuses a build, task or check when the leaf is gone, so a build never runs outside the verdict. A build the box's rules refuse names the destination and the box, and each build start logs the box, package and leaf. A box with no leaf and no own address builds in the daemon's cgroup as node-plane traffic, as before, and logs that it does. Backport of #2720. Adapted to the line: - box_actor/setup.rs hunks land in session.rs, box_ops.rs is session_sop.rs, and the tests land in session/tests.rs, with super::setup:: read as super::, a Record literal of the line's fields, and local rewrite_record and read_record helpers. - boxes, sandbox and box_manager read sessions, sandbox2 and sessions, and crate::traced becomes tokio::spawn and tokio::task::spawn_blocking. - mctx keeps the line's build_graph body, without main's dangling-hit replan, and only gains the local_orchestrator call that carries the leaf. Dropped: main's session_id on the env channel, which T104 only carried as context, the dangling-hit test in op/src/patched.rs, and the test for #2234 in op/src/specs.rs, which comes with #2234 below. (cherry picked from commit a26f89b)
norrietaylor
pushed a commit
that referenced
this pull request
Nov 5, 2026
) A non-extracted Source resolves to the download cache's own file, and it was hardlinked into the build's writable /build, so a build that appended to its input changed the cached source. It is now mapped as FileCopy, as Local files already are. FileCopy no longer truncates an existing destination: copy_input_file creates with create_new, and on a collision it keeps the first file and warns, as the hardlinked File input does. Backport of #2234. Adapted to the line: the sandbox hunk lands in sandbox2, and the new test's SpecBuild names T104's classifier_leaf and box_network fields. (cherry picked from commit 13aaa43)
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A non-extracted
Source(extract = false) resolves to the download cache's own file, andbuild_deps_mappedpassed it to the sandbox asSandboxMapped::File, which is hardlinked into the build's read-write/build. A build that writes to that input writes the cached file.Reproduced from inside a real build sandbox (minimal
6fb3c551): appending to/build/<source>.tar.gz(links=2) changed the file underdownloads/<sha256>/on the host. The download cache re-hashes on every hit (read_cached), so a later build re-downloads, but a concurrent build of the same source that has already passed that check reads the changed bytes.This maps it as
SandboxMapped::FileCopy, asLocalfiles already are. Builds thatmvorrmtheir inputs keep working, which a read-only bind would break. The cost is one copy per non-extracted source per build.Verified on the same host with a
mipbuilt from this branch: the in-sandbox file is a private copy (links=1), the build's append lands there, and the cached file keeps its sha256. The rootfs deps were already protected: writes,chmod, create, rename and a nested-usernsremount,rwof/usrare all denied.Test:
a_non_extracted_source_is_mapped_as_a_private_copy.Refs: gominimal/build-servers#231.
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