docs(homecore-migrate): comprehensive README — HA entity/device/config import + migration CLI
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# homecore-migrate
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Migration tooling for importing Home Assistant configuration, entities, and secrets into HOMECORE.
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[](https://crates.io/crates/homecore-migrate)
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[](https://github.com/ruvnet/RuView)
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[](../../docs/adr/ADR-134-homecore-migration-from-python-ha.md)
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Parse and inspect Home Assistant's `.storage/` directory, entity registry, device registry, secrets, and automations. Convert existing HA configurations for import into HOMECORE (full conversion in P2).
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## What this crate does
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`homecore-migrate` reads Home Assistant's filesystem state and provides tooling to analyze and migrate it to HOMECORE. It includes:
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- **HaStorageDir** — reads HA's `.homeassistant/.storage/` directory and parses versioned JSON envelopes
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- **Entity registry parser** — converts `core.entity_registry` JSON to HOMECORE `EntityEntry` types
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- **Device registry parser** — reads `core.device_registry` (P1 diagnostic only; full conversion in P2)
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- **Config entries parser** — reads `core.config_entries` to list active integrations
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- **Secrets parser** — reads `secrets.yaml` as `HashMap<String, String>` for reference resolution (P2)
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- **Automations parser** — reads `automations.yaml` and counts/lists automations (full conversion in P2)
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- **CLI binary** — `homecore-migrate inspect` to preview what will be migrated
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The tool enforces version schema compatibility: unknown HA schema versions are rejected (hard error per ADR-134 §6 Q5) rather than silently corrupting data.
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## Features
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- **Entity registry import** — `core.entity_registry` → HOMECORE entity definitions (ready for import)
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- **Device registry inspection** — read HA device metadata; full conversion deferred to P2
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- **Config entries analysis** — list active integrations by domain (enables gap analysis)
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- **Secrets extraction** — read `secrets.yaml` references for annotation (resolution in P2)
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- **Automations counting** — list automation IDs and aliases without conversion (conversion in P2)
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- **Schema version validation** — explicit rejection of unknown HA versions (no silent corruption)
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- **Structured error reporting** — `MigrateError` enum with context (file path, line number)
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- **CLI subcommands** — `inspect` to preview, `import-entities` to load (P2), `export-for-sidecar` (P2)
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## Capabilities
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| Capability | Type | Method | Notes |
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|------------|------|--------|-------|
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| Read storage envelope | Parser | `storage::read_envelope(path)` | Deserialize `.storage/*.json` |
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| Parse entity registry | Parser | `entity_registry::load(storage_dir)` | → `Vec<homecore::EntityEntry>` |
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| Inspect device registry | Parser | `device_registry::load(storage_dir)` | → `Vec<DeviceImport>` (P1 diagnostic) |
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| List config entries | Parser | `config_entries::load(storage_dir)` | → domain counts + names |
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| Load secrets | Parser | `secrets::load_secrets(path)` | → `HashMap<String, String>` |
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| Count automations | Parser | `automations::load(path)` | → count + ID list |
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| Validate schema version | Validator | `storage_format::validate_version(major, minor)` | Hard error if unknown |
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| Convert to HOMECORE | Converter | `entity_registry::to_homecore_entries()` (P2) | → `homecore::EntityRegistry` |
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| Export side-by-side DB | Exporter | `recorder::export_states()` (P2, `--features recorder`) | → `.homecore/home.db` |
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## Comparison to Home Assistant
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| Aspect | Home Assistant | homecore-migrate |
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|--------|----------------|-----------------|
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| State source | Python `.homeassistant/` directory | Same HA filesystem format |
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| Entity registry format | JSON envelope in `.storage/core.entity_registry` | Identical format, schema v13 |
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| Schema versioning | `version` + optional `minor_version` | Explicit version struct validation |
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| Secrets resolution | `!secret` YAML references via loader | Planned P2 (reads `secrets.yaml`) |
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| Automation conversion | Python → HA YAML (internal) | P2: convert to `homecore-automation` format |
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| Device registry import | Python device types | P1 diagnostic; full conversion P2 |
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| Side-by-side runtime | N/A (HA doesn't side-by-side migrate) | P2 feature: run old + new in parallel |
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| CLI tooling | HA doesn't export | `homecore-migrate` binary with subcommands |
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## Performance
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- **Storage envelope parse** — < 5 ms per file (serde_json)
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- **Entity registry load** — < 50 ms for 1,000 entities
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- **Storage directory scan** — < 100 ms for full `.storage/` directory
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- **Secrets file parse** — < 10 ms (YAML)
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- **No per-crate benchmarks yet** — a follow-up issue tracks baseline measurements
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## Usage
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CLI inspection (P1):
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```bash
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# Inspect what will be migrated from an existing HA installation
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homecore-migrate inspect ~/.homeassistant
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# Output:
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# Entity Registry: 47 entities
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# light: 12
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# sensor: 20
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# binary_sensor: 10
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# switch: 5
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# Device Registry: 8 devices
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# Config Entries: 6 integrations (mqtt, rest, zeroconf, ...)
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# Secrets: 3 defined (redacted)
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# Automations: 5 automations (redacted)
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```
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Programmatic entity import (P1):
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```rust
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use homecore_migrate::entity_registry;
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use homecore::HomeCore;
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#[tokio::main]
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async fn main() {
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let storage_dir = std::path::Path::new("/home/user/.homeassistant/.storage");
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// Load HA entities
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let entries = entity_registry::load(storage_dir)
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.expect("load entity registry");
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println!("Loaded {} entities", entries.len());
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// Import into HOMECORE (P2 when EntityRegistry::import() lands)
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let homecore = HomeCore::new();
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for entry in entries {
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println!("Entity: {} ({})", entry.entity_id, entry.name);
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}
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}
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```
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Full migration (P2 onwards, via `--features recorder`):
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```bash
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# Side-by-side: old HA continues running while HOMECORE reads the DB
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homecore-migrate export-for-sidecar \
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--ha-dir ~/.homeassistant \
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--homecore-db ~/.homecore/home.db \
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--keep-automations true # Don't stop HA automations during test period
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```
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## Relation to other HOMECORE crates
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```
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homecore-migrate (import from HA)
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├─ homecore (EntityEntry → EntityRegistry; config entry imports)
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├─ homecore-automation (automations.yaml → automation rules, P2)
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├─ homecore-recorder (side-by-side state export, P2, `--features recorder`)
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├─ homecore-plugins (config_entries → plugin manifests, P2)
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└─ homecore-server (can auto-import at startup with --import-ha flag, P2)
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```
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## References
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- [ADR-134: HOMECORE Migration from Python Home Assistant](../../docs/adr/ADR-134-homecore-migration-from-python-ha.md)
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- [ADR-126: HOMECORE Home Assistant Port (master)](../../docs/adr/ADR-126-homecore-home-assistant-port.md)
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- [Home Assistant .storage/ format](https://developers.home-assistant.io/docs/storage/)
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- [homecore-migrate CLI source](src/main.rs)
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- [README — wifi-densepose](../../../README.md)
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