add deprecation message

.github/workflows/kind-e2e.yaml

@@ -131,7 +131,7 @@ jobs:
     - name: Run Smoke Test
       run: |
         # Test with kind load
-        KO_DOCKER_REPO=kind.local ko apply --platform=all -f ./cmd/ko/test
+        KO_DOCKER_REPO=kind.local ko apply --platform=all -f ./test
         kubectl wait --timeout=10s --for=condition=Ready pod/kodata
         kubectl delete pod kodata
 

cmd/ko/main.go

@@ -14,6 +14,10 @@
 
 package main
 
+// HEY! YOU! This file has moved to the root of the project.
+// !! PLEASE DO NOT ADD NEW FEATURES HERE !!
+// Only sync with the root/main.go.
+
 import (
 	"log"
 	"os"
@@ -25,6 +29,15 @@ import (
 	"github.com/spf13/cobra"
 )
 
+const Deprecation258 = `NOTICE!
+-----------------------------------------------------------------
+Please install ko from github.com/google/ko.
+
+For more information see:
+   https://github.com/google/ko/issues/258
+-----------------------------------------------------------------
+`
+
 func main() {
 	logs.Warn.SetOutput(os.Stderr)
 	logs.Progress.SetOutput(os.Stderr)
@@ -43,6 +56,8 @@ func main() {
 	// registry.
 	cmds.AddCommand(cranecmd.NewCmdAuth())
 
+	log.Print(Deprecation258)
+
 	if err := cmds.Execute(); err != nil {
 		log.Fatalf("error during command execution: %v", err)
 	}

hack/update-deps.sh

@@ -30,7 +30,3 @@ go mod vendor
 # From https://stackoverflow.com/questions/22097130/delete-all-broken-symbolic-links-with-a-line
 find vendor/ -type l -exec sh -c 'for x; do [ -e "$x" ] || rm "$x"; done' _ {} +
 
-
-# HACK HACK HACK:
-# Until we can cleanly remove it, copy root main.go and move it to ./cmd/ko
-cp ${PROJECT_ROOT}/main.go ${PROJECT_ROOT}/cmd/ko/