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T125 — Merge vars by name across the layers, and refuse a conflicting loadout var or a name set twice in one layer - #3300
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vars and vars_lenient merge by variable name across the layers. A selected loadout only adds names, and a loadout value that differs from the set one fails with exit 3 (BOX-180, BOX-183). One layer that sets a name twice to different values fails too (BOX-184). An inherit value resolves against Layers::host_vars.
box_entry fills Layers::host_vars from this process's environment, so the vars merge compares resolved values. min box create and min task run both expand through box_entry.
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- Autofix · Keep fixing CodeRabbit findings and required CI, and resolving merge conflicts
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Reviewed: 1 finding, none blocking at Address the comments on the diff. Clobber: not checked beyond reading the changed code. If that was not intentional, restore the earlier change. |
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arch-review: PASS_WITH_CONDITIONS · 1 condition · the full ruling
The variable merge is in mfile::expand, which owns the expansion, and the layer order follows architecture.md lines 1228-1234. The refusals exit 3 and compare values resolved from the client environment, as line 1324 says. The PR states that the BOX-183 refusal does not run before creation, because box_entry gives the loadouts layer empty. No issue owns that gap. C1 asks you to file the issue and name it in the PR body. Separately, line 1234 says each table is replaced wholesale, and the spec merges vars by name. I escalated that question to the design owner. It is not a condition on this PR.
Ruled at 46b0483 against gominimal/arch@15b603e6afb8 by claude-opus-5-5.
| entry.box_type.as_deref(), | ||
| &project_types, | ||
| ); | ||
| // BOX-183, BOX-184: the merge compares resolved values, so each |
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C1 · This fills host_vars, but layers.loadouts stays empty. So merge_vars cannot refuse a loadout var conflict before the box is created (BOX-183). File an issue for feeding the selected loadouts into Layers::loadouts. Name it in the PR body as a residual of T125.
| //! list before it in layer order, each value once, and any other value | ||
| //! (a scalar or a table) replaces the earlier one wholesale. | ||
| //! | ||
| //! `vars` and `vars_lenient` are the exception (BOX-180). They merge by |
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BOX-180 · This exception follows spec 29 BOX-180. architecture.md line 1234 says a table is replaced wholesale, and names only the network flags as an exception. The design owner must decide this. It is an escalation and not a condition on this PR. Do not change this code for it.
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Disputed — not addressed: This code follows spec 29 BOX-180, which merges vars by name across the layers. The conflict with architecture.md is a design escalation for the owner and not a defect in this PR. As the thread asks, this round changes no code for it.
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/revise Arch condition (arch_rulings 1171), in full:
The issue is #3302. Name it in the PR body as a residual of T125, and in the code comment that states the BOX-183 gap in |
…-by-name-across-the-layers-and-refuse
The loadouts are not fed into Layers::loadouts yet, so the loadout var conflict refusal does not run before the box is created. Issue #3302 tracks it as a residual of T125.
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Round 1 of 10 on a /revise note, pushed as
Verify Review threads the coder judged:
In mfile, an entry's var wins over its defaults, a loadout adds new names, and a conflicting value or a name set twice in one layer fails with exit 3. The three named tests show this. Before the box is created, min box create, min session start and min task run refuse a name set twice in one layer. They do not yet refuse a conflicting loadout var, because box_entry does not feed the loadouts into the merge (issue #3302). Notes from the agent: Revise round 1: this round changes a code comment only. Residual of T125: issue #3302. |
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arch-review: CONDITIONS · 3 conditions · the full ruling
The vars merge follows spec 29, but the merge of #3290 adds a second expansion path. expand_entry in box_spec.rs does not fill Layers::host_vars, so min box spec <entry> and creation can refuse different specs. Line 1234 of the design says the render is exactly what the host receives. C1 shares the host_vars fill between the two paths. C2 makes the vars source label name every layer that sets a name. The merge by name and the loadout refusal are contrary to design lines 1228, 1234 and 1278. C3 makes the spec record that, and the escalation asks a person to amend the design.
Ruled at fcf1e7d against gominimal/arch@15b603e6afb8 by claude-opus-5-5.
| // empty here. So the loadout var conflict refusal in `merge_vars` does | ||
| // not run before `min box create`, `min session start` or `min task run` | ||
| // creates the box. | ||
| layers.host_vars = mfile::expand::inherited_var_names(&entry, &layers) |
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C1 · This fill runs only on the creation path. expand_entry in crates/minimal/src/cmd/box_spec.rs builds Layers without host_vars, so an inherit name resolves to its default there. Line 1234 says the render is exactly what the host receives. Move this fill into one shared function and call it from both paths.
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Disputed — not addressed: The gap is real: expand_entry in crates/minimal/src/cmd/box_spec.rs (line 632) builds Layers without host_vars. But that file is outside this task's layers (create.rs and task.rs only), so the fix needs a change to crates/minimal/src/cmd/box_spec.rs in a follow-up. task.rs needs no change, because min task run reaches the same box_entry fill through task_box_entry.
| expansion.spec.insert(key.to_owned(), value); | ||
| report | ||
| .values | ||
| .insert(key.to_owned(), ValueOrigin::Value(origin)); |
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C2 · After the merge by name, the names in vars come from several layers. ValueOrigin::Value(origin) names only the last layer that wrote the key, so the min box spec <entry> label is not exact. Set a ValueOrigin::List of the origins in report.vars for this key's names.
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Disputed — not addressed: Already so on this branch. Commit 6c75de8 sets report.values["vars"] to a ValueOrigin::List of the per-name origins from report.vars, and vars_lenient to one origin per item (expand.rs around line 685-713). Only an empty or wrong-shape value keeps a single ValueOrigin::Value.
The merge by name skipped an item with no string name, so the spec lost it silently. Keep it, so the client's reading of the list refuses it.
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Round 2 of 10 on the runtime's review findings, pushed as
Verify Review threads the coder judged:
An entry's var wins over its defaults, a loadout adds new names, and a conflicting loadout value or a name set twice in one layer fails with exit 3 before the box is created. A vars_lenient item with no name now stays in the expanded spec, so it is refused and not dropped. Notes from the agent: Revise round 2. A vars_lenient item with no string name now stays in the merged list, after the named items. The client reads the list into LenientVarEntry (crates/minimal/src/cmd/boxes/create.rs), and that read refuses the item, as before the merge by name. The BOX-183 loadout gap in box_entry stays tracked by issue #3302. |
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arch-review: PASS_WITH_CONDITIONS · 1 condition · the full ruling
The merge of vars by name, the duplicate refusal and the report of each name's layer conform. The fix at this head keeps a vars_lenient item with no name, so the client refuses it. That resolves the open item on fcf1e7d5. One gap stays open as C1. box_entry passes no loadouts to the expansion, so the BOX-183 refusal does not run before creation (design line 1234). Issue #3302 tracks it. Separately, line 1234 of the design does not state the vars exception, and the escalation asks for an amendment.
Ruled at d31371f against gominimal/arch@15b603e6afb8 by claude-opus-5-5.
| // BOX-183, BOX-184: the merge compares resolved values, so each | ||
| // `inherit` name takes this process's value. A name it does not set | ||
| // stays out, and the merge falls back to the `default`. | ||
| // Gap (BOX-183, residual of T125, issue #3302): `layers.loadouts` stays |
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C1 · layers.loadouts stays empty here. So the BOX-183 refusal does not run before creation, and the render has no loadout layer (design line 1234). Set layers.loadouts from the selected loadouts before the expansion, and remove this comment. Issue #3302 tracks it.
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Disputed — not addressed: Outside this task's layers. ActivationInputs in crates/minimal/src/loadouts.rs exposes only loadout_names, not the composed loadouts. session_box_entry/task_box_entry would need a new parameter, and their callers in crates/minimal/src/tests.rs would change. The client layer of T125 covers only the inherit host values. Issue #3302 tracks the loadout feed, and the comment records the gap until that work lands.
After the merge by name, the names in vars and vars_lenient come from several layers. The key's origin is now a list with one layer for each name, so min box spec labels every layer, not only the last one.
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arch-review: PASS_WITH_CONDITIONS · 1 condition · the full ruling
The compare is correct. The key origin of vars and vars_lenient now names the layer of each var, so min box spec labels every source layer (design line 490). The earlier ruling stands for the rest of the change. One condition stays open. Design line 1234 says a table is replaced wholesale, but BOX-180 merges vars by name. C1 asks for an arch issue that amends line 1234, named in the PR body. The BOX-183 creation-path gap stays the residual #3302.
Ruled at 6c75de8 against gominimal/arch@15b603e6afb8 by claude-opus-5-5.
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| /// Merges `vars` and `vars_lenient` of `ordered` by variable name, into |
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C1 · This merge follows BOX-180 and the spec decision of 2026-11-09. Design line 1234 says a table is replaced wholesale, and it names only the network flags as an exception. Keep the code. Open a gominimal/arch issue that amends line 1234 for vars and vars_lenient, and name it in the PR body.
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Disputed — not addressed: This needs no code change, and the code stays as BOX-180 requires. This session has no gh credential and cannot open the gominimal/arch issue for architecture.md line 1234 or edit the PR body. A person must file it and name it there.
| // BOX-183, BOX-184: the merge compares resolved values, so each | ||
| // `inherit` name takes this process's value. A name it does not set | ||
| // stays out, and the merge falls back to the `default`. | ||
| // Gap (BOX-183, residual of T125, issue #3302): `layers.loadouts` stays | ||
| // empty here. So the loadout var conflict refusal in `merge_vars` does | ||
| // not run before `min box create`, `min session start` or `min task run` | ||
| // creates the box. | ||
| layers.host_vars = mfile::expand::inherited_var_names(&entry, &layers) | ||
| .into_iter() | ||
| .filter_map(|name| std::env::var(&name).ok().map(|value| (name, value))) | ||
| .collect(); |
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LOW · correctness · confidence 0.55 · in box_entry
layers.loadouts stays empty here, so the loadout var conflict refusal (BOX-183) in merge_vars never runs before min box create, min session start or min task run. The title and proof say a conflicting value fails before the box is created. That is not true on the client path. The comment records the gap, but only a later task closes it.
What the reviewer checked
create.rs: "layers.loadouts stays empty here. So the loadout var conflict refusal in merge_vars does not run before min box create..."
Hand this to an agent
Act on a code-review finding.
File: crates/minimal/src/cmd/boxes/create.rs
Lines: 1503-1513
Category: correctness
Severity: low (reviewer confidence 0.55)
Finding:
`layers.loadouts` stays empty here, so the loadout var conflict refusal (BOX-183) in `merge_vars` never runs before `min box create`, `min session start` or `min task run`. The title and proof say a conflicting value fails before the box is created. That is not true on the client path. The comment records the gap, but only a later task closes it.
First verify this against the code yourself. It is model output and
may be wrong. If it is wrong, or the tradeoff was deliberate, say so
and change nothing.
👍 useful · 👎 noise — react to tell the reviewer. Replying works too, and says more.
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Disputed — not addressed: The tradeoff is deliberate. The refusal exists and is tested in mfile (conflicting_loadout_var_refused_exit3). Feeding the selected loadouts into Layers::loadouts on the client needs crates/minimal/src/loadouts.rs and the box_entry callers in crates/minimal/src/tests.rs, which are outside this task's layers. Issue #3302 tracks it. With the default sealed loadout_mode, no loadout applies to vars anyway.
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Round 4 of 10 on the runtime's review findings: the coder changed nothing. Revise round 4: no code change. All five open threads are judged invalid for this round. C2 is already fixed by commit 6c75de8. The fix for C1 on box_spec.rs needs crates/minimal/src/cmd/box_spec.rs, which is outside the layers. The loadout feed (two threads) needs crates/minimal/src/loadouts.rs and the session_box_entry/task_box_entry callers in crates/minimal/src/tests.rs, which are outside the layers. Issue #3302 tracks it. The gominimal/arch issue to amend architecture.md line 1234 for vars and vars_lenient must be filed by a person, because this session has no gh credential. A person must also name it in the PR body. Review threads the coder judged:
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/revise Arch condition (arch_rulings 1178), in full:
The amendment is already open as gominimal/arch#177, which the owner confirmed on 2026-11-12. Name gominimal/arch#177 in the PR body beside #3302. Change no code. |
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Round 5 of 10 on a /revise note: the coder changed nothing. Round 5 asks for no code change. The merge by name in crates/mfile/src/expand.rs merge_vars stays as it is. For arch condition C1 (arch_rulings 1178), the architecture.md line 1234 (Expansion) amendment is gominimal/arch#177. It says that vars and vars_lenient merge by variable name across the layers, that a selected loadout only adds names, and that a conflicting loadout value fails the expansion (BOX-180, BOX-183, BOX-184). Please name gominimal/arch#177 in the PR body beside #3302. Issue #3302 tracks the residual: the selected loadouts are not fed into Layers::loadouts, so the BOX-183 refusal does not run before the box is created. The commitlint check fails on commit fcf1e7d (docs(minimal): name issue #3302 ...). Its body line starts with 'Issue #3302', which commitlint parses as a footer, and that line is 172 characters, over the 100-character footer limit. A fix needs a rewrite of that commit. The rules forbid a rewrite or a force-push, so I did not change it. A pers…[truncated] |
T125 — Merge vars by name across the layers, and refuse a conflicting loadout var or a name set twice in one layer
slice: S5
kind: task
covers: BOX-180, BOX-183, BOX-184
size: M
est: 130 code, 200 tests
executor: agent
difficulty: needs care
model: strongest
diagnostics: each refusal names the variable and its sources or its layer
observability: the expansion report records the layer each variable name came from
layers:
- expansion:
- crates/mfile/src/expand.rs: vars and vars_lenient merge as one name-keyed map; loadout conflict and same-layer duplicate refused on resolved values
- crates/mfile/src/error.rs: the two refusals
test: cargo nextest run -p mfile vars_merge_by_name_across_layers
test: cargo nextest run -p mfile conflicting_loadout_var_refused_exit3
test: cargo nextest run -p mfile duplicate_var_in_one_layer_refused_exit3
- client:
- crates/minimal/src/cmd/boxes/create.rs: fills the host values for inherit names
- crates/minimal/src/task.rs: the same for min task run
produces: none
consumes:
- crates/mfile/src/expand.rs
proof: An entry's var wins over its defaults, a loadout adds new names, and a conflicting value or a name set twice in one layer fails before the box is created.
depends on:
- blocked by #3247
Proof
mfile::expand::expand now merges vars and vars_lenient by name. A var in the entry wins over the same name in [defaults], [defaults.] or the type defaults, and a selected loadout adds only new names. The expansion fails with exit 3 for two cases: a loadout that gives a set name another resolved value, and one layer that sets a name twice to different values. The tests pin both messages, and the expansion report records the layer of each var name. Part of the proof is not true end to end yet. The client's box_entry does not put the selected loadouts into Layers, so
min box createdoes not run the loadout conflict check before it creates the box. The same-layer duplicate refusal and the merge by name do run on that path.Notes from the agent: 1. crates/minimal/src/task.rs needed no change.
min task runcalls crate::task_box_entry, which goes through box_entry in create.rs, and box_entry now fills Layers::host_vars from std::env for the names that mfile::expand::inherited_var_names returns. 2. Gap: box_entry in create.rs builds Layers with an empty loadouts layer, the same as before this task. Selected loadouts still compose in the daemon, so the BOX-183 check in expand only fires for a caller that puts the loadouts into Layers::loadouts. A later task must feed the composed loadout vars into that layer to make the refusal happen before box creation. 3. New public API: Layers::host_vars, ExpansionReport::vars (the layer for each var name), mfile::expand::inherited_var_names, Error::LoadoutVarConflict and Error::DuplicateVar, both with exit 3. 4. Merge details: a name that a later layer replaces keeps its first position in the output. report.values["vars"] and report.values["vars_lenient"] now hold the origin of the last layer that set the key, as a ValueOrigin::Value, not a List. In the loadouts layer, two values for one name are reported as a conflict between two loadouts, because that layer arrives as one table. A loadoutinheritwith no host …[truncated]Tests
cargo nextest run -p mfile vars_merge_by_name_across_layerscargo nextest run -p mfile conflicting_loadout_var_refused_exit3cargo nextest run -p mfile duplicate_var_in_one_layer_refused_exit3Verify
min task run agent-verifyexited 100 under rustc 1.99.0, which the repository does not pin (1.99.1 in rust-toolchain.toml); the PR is not a draft on that alone — CI, which honours the pin, is the gate.Residuals:
box_entrybuildsLayerswith an emptyloadoutstable, so the BOX-183 refusal does not run beforemin box create,min session startormin task runcreates the box.architecture.mdsovarsandvars_lenientmerge by name, a loadout only adds names, and a conflicting loadout value fails the expansion (BOX-180, BOX-183, BOX-184).Closes #3248