chore: remove v2 from 0.52 release branch (#23445)

Co-authored-by: aljo242 <[email protected]>
cosmos · Jan 17, 2025 · 3a48b29 · 3a48b29
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diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
@@ -39,8 +39,6 @@ jobs:
       - name: Build with Secp_cgo
         if: matrix.go-arch == 'amd64'
         run: GOARCH=${{ matrix.go-arch }} COSMOS_BUILD_OPTIONS=secp make build
-      - name: Build v2 with sqlite backend
-        run: GOARCH=${{ matrix.go-arch }} COSMOS_BUILD_OPTIONS=v2,sqlite make build
         ###################
         ## Build Tooling ##
         ###################

diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
@@ -531,48 +531,6 @@ jobs:
           cd simapp
           go test -mod=readonly -timeout 30m -tags='app_v1 norace ledger test_ledger_mock' ./...
 
-  test-simapp-v2:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-go@v5
-        with:
-          go-version: "1.23"
-          check-latest: true
-          cache: true
-          cache-dependency-path: go.sum
-      - uses: technote-space/[email protected]
-        id: git_diff
-        with:
-          PATTERNS: |
-            **/*.go
-            go.mod
-            go.sum
-            **/go.mod
-            **/go.sum
-      - name: tests simapp
-        if: env.GIT_DIFF
-        run: |
-          cd simapp/v2
-          go test -mod=readonly -timeout 30m -tags='norace ledger test_ledger_mock' ./...
-      - name: simapp-v2-smoke-test
-        if: env.GIT_DIFF
-        run: |
-          COSMOS_BUILD_OPTIONS=v2 make install
-          ./scripts/init-simapp-v2.sh
-          simdv2 start &
-          SIMD_PID=$!
-          cnt=0
-          while ! simdv2 query comet block --type=height 5; do
-            cnt=$((cnt + 1))
-            if [ $cnt -gt 30 ]; then
-              kill -9 "$SIMD_PID"
-              exit 1
-            fi
-            sleep 1
-          done
-          kill -9 "$SIMD_PID"
-
   test-collections:
     runs-on: ubuntu-latest
     steps:

diff --git a/.github/workflows/v2-test.yml b/.github/workflows/v2-test.yml
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -52,6 +52,7 @@ Every module contains its own CHANGELOG.md. Please refer to the module you are i
 
 ### Improvements
 
+* (all) [#23445](https://github.com/cosmos/cosmos-sdk/pull/23445) Remove `v2` code from codebase.
 * (codec) [#22988](https://github.com/cosmos/cosmos-sdk/pull/22988) Improve edge case handling for recursion limits.
 
 ### Bug Fixes

diff --git a/README.md b/README.md
@@ -62,23 +62,19 @@ The IBC module for the Cosmos SDK has its own [cosmos/ibc-go repository](https:/
 
 The version matrix below shows which versions of the Cosmos SDK, modules and libraries are compatible with each other.
 
-> [!IMPORTANT]
-> Cosmos SDK `v2` corresponds to a chain using the `runtime/v2`, `server/v2/**`, and `store/v2` packages. The `github.com/cosmos/cosmos-sdk` module has a less important role in a `v2` chain.
-
 #### Core Dependencies
 
 Core dependencies are the core libraries that an application may depend on.
 Core dependencies not mentioned here as compatible across all maintained SDK versions.
 See an exhaustive list of core dependencies at [cosmossdk.io](https://cosmossdk.io).
 
-| Version                  | v2    | 0.52.z    | 0.50.z         | 0.47.z  |
-| ------------------------ | ----- | --------- | -------------- | ------- |
-| cosmossdk.io/core        | 1.y.z | 1.y.z     | 0.11.z         | 0.5.z   |
-| cosmossdk.io/api         | 0.8.z | 0.8.z     | 0.7.z          | 0.3.z   |
-| cosmossdk.io/x/tx        | 1.y.z | 1.y.z     | < 1.y.z        | N/A     |
-| cosmossdk.io/store       | N/A   | >= 1.10.z | 1.0.0 >= 1.9.z | N/A     |
-| cosmossdk.io/store/v2    | 2.y.z | N/A       | N/A            | N/A     |
-| cosmossdk.io/collections | 1.y.z | 1.y.z     | < 1.y.z        | < 1.y.z |
+| Version                  | 0.52.z    | 0.50.z         | 0.47.z  |
+|--------------------------|-----------|----------------|---------|
+| cosmossdk.io/core        | 1.y.z     | 0.11.z         | 0.5.z   |
+| cosmossdk.io/api         | 0.8.z     | 0.7.z          | 0.3.z   |
+| cosmossdk.io/x/tx        | 1.y.z     | < 1.y.z        | N/A     |
+| cosmossdk.io/store       | >= 1.10.z | 1.0.0 >= 1.9.z | N/A     |
+| cosmossdk.io/collections | 1.y.z     | < 1.y.z        | < 1.y.z |
 
 #### Module Dependencies
 
@@ -88,24 +84,24 @@ Module Dependencies are the modules that an application may depend on and which
 > X signals that the module was not spun out into its own go.mod file.
 > N/A signals that the module was not available in the Cosmos SDK at that time.
 
-| Cosmos SDK                  | v2    | 0.52.z | 0.50.z |
-| --------------------------- | ----- | ------ | ------ |
-| cosmossdk.io/x/accounts     | 0.2.z | 0.2.z  | N/A    |
-| cosmossdk.io/x/bank         | 0.2.z | 0.2.z  | X      |
-| cosmossdk.io/x/circuit      | 0.2.z | 0.2.z  | 0.1.z  |
-| cosmossdk.io/x/consensus    | 0.2.z | 0.2.z  | X      |
-| cosmossdk.io/x/distribution | 0.2.z | 0.2.z  | X      |
-| cosmossdk.io/x/epochs       | 0.2.z | 0.2.z  | N/A    |
-| cosmossdk.io/x/evidence     | 0.2.z | 0.2.z  | 0.1.z  |
-| cosmossdk.io/x/feegrant     | 0.2.z | 0.2.z  | 0.1.z  |
-| cosmossdk.io/x/gov          | 0.2.z | 0.2.z  | X      |
-| cosmossdk.io/x/group        | 0.2.z | 0.2.z  | X      |
-| cosmossdk.io/x/mint         | 0.2.z | 0.2.z  | X      |
-| cosmossdk.io/x/nft          | 0.2.z | 0.2.z  | 0.1.z  |
-| cosmossdk.io/x/protocolpool | 0.2.z | 0.2.z  | N/A    |
-| cosmossdk.io/x/slashing     | 0.2.z | 0.2.z  | X      |
-| cosmossdk.io/x/staking      | 0.2.z | 0.2.z  | X      |
-| cosmossdk.io/x/upgrade      | 0.2.z | 0.2.z  | 0.1.z  |
+| Cosmos SDK                  | 0.52.z | 0.50.z |
+|-----------------------------|--------|--------|
+| cosmossdk.io/x/accounts     | 0.2.z  | N/A    |
+| cosmossdk.io/x/bank         | 0.2.z  | X      |
+| cosmossdk.io/x/circuit      | 0.2.z  | 0.1.z  |
+| cosmossdk.io/x/consensus    | 0.2.z  | X      |
+| cosmossdk.io/x/distribution | 0.2.z  | X      |
+| cosmossdk.io/x/epochs       | 0.2.z  | N/A    |
+| cosmossdk.io/x/evidence     | 0.2.z  | 0.1.z  |
+| cosmossdk.io/x/feegrant     | 0.2.z  | 0.1.z  |
+| cosmossdk.io/x/gov          | 0.2.z  | X      |
+| cosmossdk.io/x/group        | 0.2.z  | X      |
+| cosmossdk.io/x/mint         | 0.2.z  | X      |
+| cosmossdk.io/x/nft          | 0.2.z  | 0.1.z  |
+| cosmossdk.io/x/protocolpool | 0.2.z  | N/A    |
+| cosmossdk.io/x/slashing     | 0.2.z  | X      |
+| cosmossdk.io/x/staking      | 0.2.z  | X      |
+| cosmossdk.io/x/upgrade      | 0.2.z  | 0.1.z  |
 
 ## Disambiguation
 

diff --git a/UPGRADING.md b/UPGRADING.md
@@ -5,8 +5,6 @@ Note, always read the **SimApp** section for more information on application wir
 
 ## [v0.52.x](https://github.com/cosmos/cosmos-sdk/releases/tag/v0.52.0-alpha.0)
 
-Documentation to migrate an application from v0.50.x to server/v2 is available elsewhere.
-It is additional to the changes described here.
 
 ### SimApp
 
@@ -33,7 +31,7 @@ clientCtx = clientCtx.
 
 **When using `depinject` / `app_di`, the client codecs can be provided directly from application config.**
 
-Refer to SimApp `root_v2.go` and `root.go` for an example with an app di and a legacy app.
+Refer to SimApp `root.go` for an example with an app di and a legacy app.
 
 Additionally, a simplification of the start command leads to the following change:
 
@@ -329,7 +327,7 @@ All modules (expect `auth`) were spun out into their own `go.mod`. Replace their
 
 ##### Core API
 
-Core API has been introduced for modules since v0.47. With the deprecation of `sdk.Context`, we strongly recommend to use the `cosmossdk.io/core/appmodule` interfaces for the modules. This will allow the modules to work out of the box with server/v2 and baseapp, as well as limit their dependencies on the SDK.
+Core API has been introduced for modules since v0.47. With the deprecation of `sdk.Context`, we strongly recommend to use the `cosmossdk.io/core/appmodule` interfaces for the modules. This will allow the modules to work out of the box with baseapp, as well as limit their dependencies on the SDK.
 
 Additionally, the `appmodule.Environment` struct is introduced to fetch different services from the application.
 This should be used as an alternative to using `sdk.UnwrapContext(ctx)` to fetch the services.
@@ -465,9 +463,6 @@ Existing chains using `x/distribution` module must add the new `x/protocolpool`
 #### `x/gov`
 
 Gov v1beta1 proposal handler has been changed to take in a `context.Context` instead of `sdk.Context`.
-This change was made to allow legacy proposals to be compatible with server/v2.
-If you wish to migrate to server/v2, you should update your proposal handler to take in a `context.Context` and use services.
-On the other hand, if you wish to keep using baseapp, simply unwrap the sdk context in your proposal handler.
 
 #### `x/mint`
 
@@ -510,7 +505,7 @@ storetypes.StoreUpgrades{
 
 #### `x/validate`
 
-Introducing `x/validate` a module that is solely used for registering default ante/post handlers and global tx validators when using runtime and runtime/v2. If you wish to set your custom ante/post handlers, no need to use this module.
+Introducing `x/validate` a module that is solely used for registering default ante/post handlers and global tx validators when using runtime. If you wish to set your custom ante/post handlers, no need to use this module.
 You can however always extend them by adding extra tx validators (see `x/validate` documentation).
 
 #### `tools/benchmark`

diff --git a/UPGRADING_v2.md b/UPGRADING_v2.md