Expose the last error message to the onBatchCopyRetry hook

Co-authored-by: Bastian Bartmann <[email protected]>

Author: grodowski

go/logic/hooks.go

@@ -125,8 +125,9 @@ func (this *HooksExecutor) onBeforeRowCopy() error {
 	return this.executeHooks(onBeforeRowCopy)
 }
 
-func (this *HooksExecutor) onBatchCopyRetry() error {
-	return this.executeHooks(onBatchCopyRetry)
+func (this *HooksExecutor) onBatchCopyRetry(errorMessage string) error {
+	v := fmt.Sprintf("GH_OST_LAST_BATCH_COPY_ERROR=%s", errorMessage)
+	return this.executeHooks(onBatchCopyRetry, v)
 }
 
 func (this *HooksExecutor) onRowCopyComplete() error {

go/logic/migrator.go

@@ -133,7 +133,7 @@ func (this *Migrator) sleepWhileTrue(operation func() (bool, error)) error {
 func (this *Migrator) retryBatchCopyWithHooks(operation func() error, notFatalHint ...bool) (err error) {
 	wrappedOperation := func() error {
 		if err := operation(); err != nil {
-			this.hooksExecutor.onBatchCopyRetry()
+			this.hooksExecutor.onBatchCopyRetry(err.Error())
 			return err
 		}
 		return nil