feat: notify user their version of dbc is out of date

cmd/dbc/latest.go

@@ -0,0 +1,34 @@
+// Copyright 2026 Columnar Technologies Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//go:build !no_notify_latest
+
+package main
+
+import (
+	"fmt"
+
+	"github.com/Masterminds/semver/v3"
+	"github.com/columnar-tech/dbc"
+)
+
+func notifyLatest() {
+	latestVer, err := dbc.GetLatestDbcVersion()
+	if dbc.Version != "(devel)" && err == nil {
+		if semver.MustParse(dbc.Version).LessThan(latestVer) {
+			fmt.Printf(descStyle.Render("dbc version %s is available! You are using version %s. Please upgrade.\n\n"),
+				latestVer, dbc.Version)
+		}
+	}
+}

cmd/dbc/latest_ignore.go

@@ -0,0 +1,19 @@
+// Copyright 2026 Columnar Technologies Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//go:build no_notify_latest
+
+package main
+
+func notifyLatest() {}

cmd/dbc/main.go

@@ -268,6 +268,10 @@ func main() {
 		prog = tea.NewProgram(m)
 	}
 
+	if !args.Quiet {
+		notifyLatest()
+	}
+
 	if m, err = prog.Run(); err != nil {
 		fmt.Fprintln(os.Stderr, "Error running program:", err)
 		os.Exit(1)

drivers.go

@@ -527,3 +527,17 @@ func SignedByColumnar(lib, sig io.Reader) error {
 
 	return result.SignatureError()
 }
+
+func GetLatestDbcVersion() (*semver.Version, error) {
+	resp, err := makereq("https://dbc.columnar.tech")
+	if err != nil {
+		return nil, fmt.Errorf("failed to fetch latest dbc version: %w", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusNoContent {
+		return nil, fmt.Errorf("failed to fetch latest dbc version: %s", resp.Status)
+	}
+
+	return semver.NewVersion(resp.Header.Get("x-dbc-latest"))
+}