chore: adding sentinel path for solomachine header (#2748)

chore(statemachine)!: Adding sentinel value for header path in 06-solomachine.

Author: damiannolan

CHANGELOG.md

@@ -69,7 +69,8 @@ Ref: https://keepachangelog.com/en/1.0.0/
 ### State Machine Breaking
 
 * (light-clients/07-tendermint) [\#2554](https://github.com/cosmos/ibc-go/pull/2554) Forbid negative values for `TrustingPeriod`, `UnbondingPeriod` and `MaxClockDrift` (as specified in ICS-07).
-* (06-solomachine) [\#2744](https://github.com/cosmos/ibc-go/pull/2744)  `Misbehaviour.ValidateBasic()` now only enforces that signature data does not match when the signature paths are different.
+* (06-solomachine) [\#2744](https://github.com/cosmos/ibc-go/pull/2744) `Misbehaviour.ValidateBasic()` now only enforces that signature data does not match when the signature paths are different.
+* (06-solomachine) [\#2748](https://github.com/cosmos/ibc-go/pull/2748) Adding sentinel value for header path in 06-solomachine.
 
 ### Improvements
 

modules/light-clients/06-solomachine/header.go

@@ -10,6 +10,9 @@ import (
 	"github.com/cosmos/ibc-go/v6/modules/core/exported"
 )
 
+// SentinelHeaderPath defines a placeholder path value used for headers in solomachine client updates
+const SentinelHeaderPath = "solomachine:header"
+
 var _ exported.ClientMessage = &Header{}
 
 // ClientType defines that the Header is a Solo Machine.

modules/light-clients/06-solomachine/update.go

@@ -57,7 +57,7 @@ func (cs ClientState) verifyHeader(ctx sdk.Context, cdc codec.BinaryCodec, clien
 		Sequence:    header.Sequence,
 		Timestamp:   header.Timestamp,
 		Diversifier: cs.ConsensusState.Diversifier,
-		Path:        []byte{},
+		Path:        []byte(SentinelHeaderPath),
 		Data:        dataBz,
 	}
 

testing/solomachine.go

@@ -126,7 +126,7 @@ func (solo *Solomachine) CreateHeader(newDiversifier string) *solomachine.Header
 		Sequence:    solo.Sequence,
 		Timestamp:   solo.Time,
 		Diversifier: solo.Diversifier,
-		Path:        []byte{},
+		Path:        []byte(solomachine.SentinelHeaderPath),
 		Data:        dataBz,
 	}