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3,557 commits this week Jun 16, 2026 - Jun 23, 2026
Add Storage snapshot-policy variants for preview and preprod
mainnet keeps the Mithril snapshot policy (base default); the test
networks override LedgerDB.Snapshots with an explicit options object: the
per-network SnapshotInterval (preview 864, preprod 4320) plus the full set
of snapshot options (SlotOffset 0, RateLimit 600, MinDelay 300, MaxDelay
600, NumOfDiskSnapshots 2). Closes the last parsed network-divergence gap.
Add Storage snapshot-policy variants for preview and preprod
mainnet keeps the Mithril snapshot policy (base default); the test
networks override LedgerDB.Snapshots with an explicit options object: the
per-network SnapshotInterval (preview 864, preprod 4320) plus the full set
of snapshot options (SlotOffset 0, RateLimit 600, MinDelay 300, MaxDelay
600, NumOfDiskSnapshots 2). Closes the last parsed network-divergence gap.
Layer configuration sources with deep merge
- A section value may now be a list of paths/objects, deep-merged in
  order so a later entry overrides an earlier one (e.g.
  ["Network.variants/Network.relay.json"]); nested objects merge
  recursively.
- The package's base default defaults/<Component>.json is always read as
  the bottom layer and the user's section layer is merged on top, so a
  config can name only a variant and still inherit the base defaults.
- Move the opt-in variant files into defaults/<Component>.variants/.
- Expose the data dir via Paths_cardano_config; add an example and a test
  asserting later-overrides-earlier.
Make every component f-parameterised and resolve to a complete config
Give Network, LocalConnections, Mempool and Testing the f parameter (as
Storage/Consensus/Protocol already had), so NodeConfiguration carries
Identity-wrapped components and is complete by construction. A field
becomes f a when it has an always-applied base default and stays Maybe
when 'unset' is a valid state. Each component gains a finalize that turns
the merged partial form into Identity (erroring, via requireField, if a
base default is missing); resolveConfiguration runs them and reports
failures as ConfigResolutionError. Add a resolveConfiguration test.

Also rename the envelope keys to { Version, Configuration } and fix the
README (any component can be a sub-file/list; HermodTracing should point
at a tracing file relative to the config).
Add cardano-config package
Introduce a new `cardano-config` library that provides a single
entry-point for parsing the `cardano-node` configuration.

It defines:

- A CLI options parser based on `optparse-applicative` (`parseCliArgs`).
- JSON/YAML parsing of the configuration files, derived from
  `autodocodec` codecs (`parseConfigurationFiles`).
- `resolveConfiguration`, combining both into a `NodeConfiguration`.

The configuration keys are grouped into components (Storage, Consensus,
Mempool, Network, Protocol, Testing, Tracing). A bundled
`cardano-config-schema` executable dumps the JSON Schema derived from the
same codecs as the authoritative key listing.

Register the package in `cabal.project`.
Add per-component default configuration files
cardano-config is the origin of one defaults file per component, applied
as the base layer during resolution. Each component is ultimately owned
by its implementing layer, which will adopt these and keep them aligned
via CI. Values confirmed from ouroboros-network are included; the rest
are left unset for the owning layer to fill (see defaults/README.md).
Genesis files are intentionally not defaulted (network-specific).