mixedversion: remove special case for skipping current version

In the past, we used to bump CRDB's minSupportedVersion _before_
bumping CRDB's current version.

Consider the old version bump process:
  1. Bump minimum supported version (e.g. 25.2→25.3)
  2. Bump current version (e.g. 25.4→26.1)
  3. Bump minimum supported version again (e.g. 25.3→25.4)

After the first step, we would be in a state where the
mixed version framework would see v25.3 as a skippable
version (.1 and .3 ordinal versions are skippable), but
since the minimum supported version is 25.3, 25.2→25.4
is (temporarily) not a legal upgrade.

This required a special case to disallow skip upgrades
in the case of this edge case. However, we now bump the
current version _first_. This means we no longer need
to protect against the above and we actually hit a
different bug.

Since we now bump the current version first, the special
case will always view the current version as having multiple
supported predecessors and force a skip upgrade even if not
applicable.

Author: DarrylWong

pkg/cmd/roachtest/roachtestutil/mixedversion/BUILD.bazel

@@ -14,7 +14,6 @@ go_library(
     importpath = "github.com/cockroachdb/cockroach/pkg/cmd/roachtest/roachtestutil/mixedversion",
     visibility = ["//visibility:public"],
     deps = [
-        "//pkg/clusterversion",
         "//pkg/cmd/roachprod/grafana",
         "//pkg/cmd/roachtest/cluster",
         "//pkg/cmd/roachtest/option",
@@ -39,7 +38,6 @@ go_library(
         "//pkg/util/syncutil",
         "//pkg/util/timeutil",
         "@com_github_cockroachdb_errors//:errors",
-        "@com_github_cockroachdb_version//:version",
         "@org_golang_x_exp//maps",
     ],
 )
@@ -59,7 +57,6 @@ go_test(
     embed = [":mixedversion"],
     embedsrcs = ["testdata/test_releases.yaml"],
     deps = [
-        "//pkg/clusterversion",
         "//pkg/cmd/roachtest/option",
         "//pkg/cmd/roachtest/registry",
         "//pkg/cmd/roachtest/roachtestutil",

pkg/cmd/roachtest/roachtestutil/mixedversion/mixedversion.go

@@ -79,7 +79,6 @@ import (
 	"sync"
 	"time"
 
-	"github.com/cockroachdb/cockroach/pkg/clusterversion"
 	"github.com/cockroachdb/cockroach/pkg/cmd/roachtest/cluster"
 	"github.com/cockroachdb/cockroach/pkg/cmd/roachtest/option"
 	"github.com/cockroachdb/cockroach/pkg/cmd/roachtest/registry"
@@ -94,7 +93,6 @@ import (
 	"github.com/cockroachdb/cockroach/pkg/testutils/release"
 	"github.com/cockroachdb/cockroach/pkg/util/randutil"
 	"github.com/cockroachdb/errors"
-	"github.com/cockroachdb/version"
 )
 
 const (
@@ -613,14 +611,6 @@ func (t *Test) supportsSkipUpgradeTo(pred, v *clusterupgrade.Version) bool {
 	if t.options.minimumSupportedVersion.Series() == pred.Series() {
 		return false
 	}
-	// Special case for the current release series. This is useful to keep the
-	// test correct when we bump the minimum supported version separately from
-	// the current version.
-	r := clusterversion.Latest.ReleaseSeries()
-	currentMajor := version.MajorVersion{Year: int(r.Major), Ordinal: int(r.Minor)}
-	if currentMajor.Equals(v.Version.Major()) {
-		return len(clusterversion.SupportedPreviousReleases()) > 1
-	}
 
 	series := v.Version.Major()
 	switch {

pkg/cmd/roachtest/roachtestutil/mixedversion/mixedversion_test.go

@@ -11,7 +11,6 @@ import (
 	"math/rand"
 	"testing"
 
-	"github.com/cockroachdb/cockroach/pkg/clusterversion"
 	"github.com/cockroachdb/cockroach/pkg/cmd/roachtest/option"
 	"github.com/cockroachdb/cockroach/pkg/cmd/roachtest/registry"
 	"github.com/cockroachdb/cockroach/pkg/cmd/roachtest/roachtestutil/clusterupgrade"
@@ -468,13 +467,6 @@ func TestSupportsSkipUpgradeTo(t *testing.T) {
 	expect := func(verStr string, expected bool) {
 		t.Helper()
 		v := clusterupgrade.MustParseVersion(verStr)
-		r := clusterversion.Latest.ReleaseSeries()
-		currentMajor := version.MajorVersion{Year: int(r.Major), Ordinal: int(r.Minor)}
-		if currentMajor.Equals(v.Version.Major()) {
-			// We have to special case the current series, to allow for bumping the
-			// min supported version separately from the current version.
-			expected = len(clusterversion.SupportedPreviousReleases()) > 1
-		}
 		require.Equal(t, expected, mvt.supportsSkipUpgradeTo(prev, v))
 	}
 	for _, v := range []string{"v24.3.0", "v24.3.0-beta.1", "v25.2.1", "v25.2.0-rc.1"} {

pkg/cmd/roachtest/roachtestutil/mixedversion/testdata/planner/separate_process

@@ -44,8 +44,8 @@ Plan:
 ├── delete all-tenants override for the `version` key (9) [stage=system:tenant-setup;tenant:tenant-setup]
 ├── run startup hooks concurrently
 │   ├── run "create tables" hookId="planner_test.go:141", after 3m0s delay (10) [stage=system:on-startup;tenant:on-startup]
-│   └── run "initialize bank workload" hookId="mixedversion.go:884", after 100ms delay (11) [stage=system:on-startup;tenant:on-startup]
-├── run "bank workload" hookId="mixedversion.go:892" (12) [stage=system:background;tenant:background]
+│   └── run "initialize bank workload" hookId="mixedversion.go:874", after 100ms delay (11) [stage=system:on-startup;tenant:on-startup]
+├── run "bank workload" hookId="mixedversion.go:882" (12) [stage=system:background;tenant:background]
 ├── upgrade cluster from "v22.2.3" to "v23.1.4"
 │   ├── upgrade storage cluster
 │   │   ├── prevent auto-upgrades on system tenant by setting `preserve_downgrade_option` (13) [stage=system:init;tenant:upgrading-system]

pkg/cmd/roachtest/roachtestutil/mixedversion/testdata/planner/shared_process

@@ -53,8 +53,8 @@ Plan:
 ├── delete all-tenants override for the `version` key (16) [stage=system:tenant-setup;tenant:tenant-setup]
 ├── run startup hooks concurrently
 │   ├── run "create tables" hookId="planner_test.go:141", after 30s delay (17) [stage=system:on-startup;tenant:on-startup]
-│   └── run "initialize bank workload" hookId="mixedversion.go:884", after 3m0s delay (18) [stage=system:on-startup;tenant:on-startup]
-├── run "bank workload" hookId="mixedversion.go:892" (19) [stage=system:background;tenant:background]
+│   └── run "initialize bank workload" hookId="mixedversion.go:874", after 3m0s delay (18) [stage=system:on-startup;tenant:on-startup]
+├── run "bank workload" hookId="mixedversion.go:882" (19) [stage=system:background;tenant:background]
 ├── upgrade cluster from "v23.1.12" to "v23.2.0"
 │   ├── prevent auto-upgrades on system tenant by setting `preserve_downgrade_option` (20) [stage=system:init;tenant:init]
 │   ├── prevent auto-upgrades on mixed-version-tenant-cyvju tenant by setting `preserve_downgrade_option` (21) [stage=system:init;tenant:init]

pkg/cmd/roachtest/roachtestutil/mixedversion/testdata/planner/step_stages

@@ -35,10 +35,10 @@ Plan:
 ├── install fixtures for version "v22.2.3" (1) [stage=system-setup]
 ├── start cluster at version "v22.2.3" (2) [stage=system-setup]
 ├── wait for all nodes (:1-4) to acknowledge cluster version '22.2' on system tenant (3) [stage=system-setup]
-├── run "initialize bank workload" hookId="mixedversion.go:884" (4) [stage=on-startup]
+├── run "initialize bank workload" hookId="mixedversion.go:874" (4) [stage=on-startup]
 ├── start background hooks concurrently
-│   ├── run "bank workload" hookId="mixedversion.go:892", after 0s delay (5) [stage=background]
-│   └── run "csv server" hookId="mixedversion.go:861", after 0s delay (6) [stage=background]
+│   ├── run "bank workload" hookId="mixedversion.go:882", after 0s delay (5) [stage=background]
+│   └── run "csv server" hookId="mixedversion.go:851", after 0s delay (6) [stage=background]
 ├── upgrade cluster from "v22.2.3" to "v23.1.4"
 │   ├── prevent auto-upgrades on system tenant by setting `preserve_downgrade_option` (7) [stage=init]
 │   ├── upgrade nodes :1-4 from "v22.2.3" to "v23.1.4"