feat: first-draft preview-capable zosstorage
- CLI: add topology selection (-t/--topology), preview flags (--show/--report), and removable policy override (--allow-removable) (src/cli/args.rs) - Config: built-in sensible defaults; deterministic overlays for logging, fstab, removable, topology (src/config/loader.rs) - Device: discovery via /proc + /sys with include/exclude regex and removable policy (src/device/discovery.rs) - Idempotency: detection via blkid; safe emptiness checks (src/idempotency/mod.rs) - Partition: topology-driven planning (Single, DualIndependent, BtrfsRaid1, SsdHddBcachefs) (src/partition/plan.rs) - FS: planning + creation (mkfs.vfat, mkfs.btrfs, bcachefs format) and UUID capture via blkid (src/fs/plan.rs) - Orchestrator: pre-flight with preview JSON (disks, partition_plan, filesystems_planned, mount scheme). Skips emptiness in preview; supports stdout+file (src/orchestrator/run.rs) - Util/Logging/Types/Errors: process execution, tracing, shared types (src/util/mod.rs, src/logging/mod.rs, src/types.rs, src/errors.rs) - Docs: add README with exhaustive usage and preview JSON shape (README.md) Builds and unit tests pass: discovery, util, idempotency helpers, and fs parser tests.
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docs/VIBE_HOWTO.md
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docs/VIBE_HOWTO.md
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# VIBE HOWTO — Work Fast Without Re-reading the Tree
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Purpose
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- Ship features incrementally, with minimal context reload.
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- Use grep-friendly region markers, a single API index, and clear responsibilities per module.
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- Keep safety and error conventions explicit and consistent.
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Key Ideas
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- Contracts live in [docs/API-SKELETONS.md](docs/API-SKELETONS.md).
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- Every module starts with REGION blocks that act like a 10-second summary.
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- Architectural decisions go in ADRs under [docs/adr/0001-modular-workflow.md](docs/adr/0001-modular-workflow.md).
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- Examples live at [config/zosstorage.example.yaml](../config/zosstorage.example.yaml).
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Quickstart
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- Build:
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- cargo build
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- Inspect CLI:
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- cargo run -- --help
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- Run with config and debug logs:
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- cargo run -- --config ./config/zosstorage.example.yaml --log-level debug
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- Default config file location (initramfs/user space):
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- /etc/zosstorage/config.yaml (copy from [config/zosstorage.example.yaml](../config/zosstorage.example.yaml))
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What the REGION markers mean
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- REGION: API — one-liners for public items; grep target
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- REGION: RESPONSIBILITIES — scope and non-goals
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- REGION: EXTENSION_POINTS — how to extend without rewriting modules
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- REGION: SAFETY — invariants; when to abort; idempotency rules
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- REGION: ERROR_MAPPING — exact mapping to Error variants
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- REGION: TODO — the next concrete steps to implement
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Where to start (by responsibility)
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- Entrypoint/binary:
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- [src/main.rs](../src/main.rs)
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- CLI parsing:
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- [src/cli/args.rs](../src/cli/args.rs)
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- Logging initialization:
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- [src/logging/mod.rs](../src/logging/mod.rs)
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- Config load/merge/validate:
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- [src/config/loader.rs](../src/config/loader.rs)
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- [src/types.rs](../src/types.rs)
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- Device discovery:
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- [src/device/discovery.rs](../src/device/discovery.rs)
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- Partitioning planning/apply:
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- [src/partition/plan.rs](../src/partition/plan.rs)
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- Filesystem planning/create:
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- [src/fs/plan.rs](../src/fs/plan.rs)
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- Mount planning/apply + fstab:
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- [src/mount/ops.rs](../src/mount/ops.rs)
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- Reporting JSON:
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- [src/report/state.rs](../src/report/state.rs)
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- Orchestration:
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- [src/orchestrator/run.rs](../src/orchestrator/run.rs)
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- Idempotency/emptiness probes:
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- [src/idempotency/mod.rs](../src/idempotency/mod.rs)
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- External tools and shell-out:
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- [src/util/mod.rs](../src/util/mod.rs)
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Daily workflow (feature implementation)
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1) Find the module
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- Open the file and read the REGION header block for a 10-second overview.
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- If you don’t know where to look, grep by region:
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- grep -R "REGION: TODO" src/
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- grep -R "REGION: API" src/
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2) Implement only the declared APIs first
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- Keep signatures stable (as in [docs/API-SKELETONS.md](docs/API-SKELETONS.md)).
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- Replace todo!() bodies one by one.
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- Add safety and error notes under REGION: SAFETY and REGION: ERROR_MAPPING.
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3) Keep docs in sync
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- If you change a signature, update [docs/API-SKELETONS.md](docs/API-SKELETONS.md).
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- If behavior or invariants change, update [docs/SPECS.md](docs/SPECS.md).
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- If it’s an architectural choice, add or edit an ADR under [docs/adr/0001-modular-workflow.md](docs/adr/0001-modular-workflow.md).
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4) Validate and build
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- cargo build
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- Use [config/zosstorage.example.yaml](../config/zosstorage.example.yaml) to drive configs.
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- For VM testing guidance see [PROMPT.md](../PROMPT.md) Testing & Validation.
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Error policy (quick rules)
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- Map external tool failures to Error::Tool with status and stderr (see [src/errors.rs](../src/errors.rs)).
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- Validation failures should be Error::Validation with clear messages.
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- Config IO/parse issues are Error::Config; reporting IO errors are Error::Report.
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- Use Error::Other(anyhow) sparingly (last-resort wrapping).
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Safety and idempotency rules
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- Never change a disk that isn’t empty when require_empty_disks=true.
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- Partitioning must guarantee GPT, 1 MiB alignment, reserved GPT names, and no preexisting signatures.
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- Filesystems must use reserved labels: ZOSBOOT (ESP) and ZOSDATA (all data filesystems).
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- Orchestrator must do nothing on already-provisioned systems and exit success.
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Suggested first implementation tasks
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- Utilities (unblocks everything else)
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- Implement which_tool, run_cmd, run_cmd_capture, udev_settle in [src/util/mod.rs](../src/util/mod.rs)
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- Kernel cmdline data: URL support
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- Add base64 YAML support to config loading in [src/config/loader.rs](../src/config/loader.rs)
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- Logging init
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- Implement tracing setup in [src/logging/mod.rs](../src/logging/mod.rs), idempotent setup, optional file target
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VM test matrix (virtio /dev/vd?)
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- 1 disk (/dev/vda):
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- single → btrfs on data, label ZOSDATA
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- 2 disks (/dev/vda, /dev/vdb):
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- dual_independent → btrfs per disk (two ZOSDATA)
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- bcachefs cache/backing → /dev/vda cache (SSD-like), /dev/vdb backing (HDD-like), label ZOSDATA
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- btrfs_raid1 → mirrored btrfs across both, label ZOSDATA
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- 3 disks (/dev/vda, /dev/vdb, /dev/vdc):
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- bcachefs → cache on /dev/vda; backing on /dev/vdb and /dev/vdc with two replicas; label ZOSDATA
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Continuity checklist (resume after a break)
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- Open the target module and read the REGION block.
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- grep -R "REGION: TODO" src/ to find pending items.
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- Verify the function signatures in [docs/API-SKELETONS.md](docs/API-SKELETONS.md).
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- Check recent ADRs under [docs/adr/0001-modular-workflow.md](docs/adr/0001-modular-workflow.md).
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- Skim [docs/SPECS.md](docs/SPECS.md) for behavior notes and in-progress sections.
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Commit discipline
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- Small commits per module/functionality.
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- Keep REGION markers accurate (especially API and TODO).
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- When changing behavior, update docs and/or ADRs in the same PR.
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Reference index
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- Architecture: [docs/ARCHITECTURE.md](docs/ARCHITECTURE.md)
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- Schema: [docs/SCHEMA.md](docs/SCHEMA.md)
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- API Index: [docs/API-SKELETONS.md](docs/API-SKELETONS.md)
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- Specs: [docs/SPECS.md](docs/SPECS.md)
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- Dev Workflow (detailed): [docs/DEV_WORKFLOW.md](docs/DEV_WORKFLOW.md)
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- ADR: [docs/adr/0001-modular-workflow.md](docs/adr/0001-modular-workflow.md)
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- Example config: [config/zosstorage.example.yaml](../config/zosstorage.example.yaml)
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