sub.in/install2/Makefile: enforce a kernel

A bit earlier the situation where there was a stage1 fallback for INSTALLER_KFLAVOUR as the last of KFLAVOURS, so we'd have an installer kernel or build would break; now the situration got somewhat twisted: there could be a vmlinuz in stage1 but no corresponding modules in install2 -- which can lead to different surprises but at least alterator-vm would complain about "Operation not permitted" on partition layout commit. The fallback is a copypaste from sub.in/stage1/Makefile though and should be redone properly somewhere. The question so far is, where exactly?

sub.in/install2/Makefile: enforce a kernel
50e0779f · Michael Shigorin · c4e0a249 · 50e0779f
Commit 50e0779f authored Jul 14, 2011 by Michael Shigorin
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Makefile sub.in/install2/Makefile +8 -0

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--- a/sub.in/install2/Makefile
+++ b/sub.in/install2/Makefile
@@ -13,6 +13,14 @@ include $(MKIMAGE_PREFIX)/config.mk
 # this might have been prepared by ../stage1/scripts.d/03-test-kernel
 -include $(GLOBAL_BUILDDIR)/squashcfg.mk

+# here we also try and come up with the installer kernel/modules, if any;
+# no kernel flavour specified will result in no modules for stage1 vmlinuz
+INSTALLER_KFLAVOUR ?= $(lastword $(KFLAVOURS))
+
+ifeq "$(INSTALLER_KFLAVOUR)" ""
+$(error INSTALLER_KFLAVOUR is utterly empty; cannot guess either)
+endif
+
 # need kernel modules only (which require corresponding kernel-image);
 # these go into work chroot; NB: no vmlinuz there
 IMAGE_PACKAGES_REGEXP = $(call kpackages,$(INSTALLER_KMODULES),$(INSTALLER_KFLAVOUR))