build-vm, kernel, uboot: return possibility of changing boot sequence of kernels

Since packet sorting is enabled by default, then
the order in KFLAVORS has ceased to matter.
Kernels are always installed in alphabetical order.
Therefore, it makes no sense to sort by buildtime.
See-also: https://bugzilla.altlinux.org/show_bug.cgi?id=30806

Also fixed my typo. When creating a symlink, the variable
$kver was used, i.e. the entire list of kernels, not the
last value $KVER of the list.

features.in/build-vm/image-scripts.d/07-kernel

@@ -2,13 +2,20 @@
 # predictable file locations make bootloader configuration simple;
 # this script relates to features.in/stage2/stage1/scripts.d/81-make-initfs
 
-kver="$(rpm -qa 'kernel-image*' \
-            --qf '%{installtime} %{version}-%{name}-%{release}\n' \
-        | sort -n \
-        | cut -f 2 -d ' ' \
-        | sed 's/kernel-image-//')"
+[ -n "$GLOBAL_KFLAVOURS" ] ||
+  { echo "** KFLAVOURS is empty" >&2; exit 0; }
 
-[ -n "$kver" ] || { echo "** unable to deduce kernel version" >&2; exit 1; }
+kver=
+echo $GLOBAL_KFLAVOURS
+for KFLAVOUR in $GLOBAL_KFLAVOURS; do
+	kver+=" $(rpm -qa 'kernel-image*' \
+		--qf '%{version}-%{name}-%{release}\n' \
+	| grep "$KFLAVOUR" \
+	| sed 's/kernel-image-//')"
+done
+
+[ ! -z "${kver#"${kver%%[! ]*}"}" ] ||
+  { echo "** unable to deduce kernel version" >&2; exit 1; }
 
 cd /boot
 
@@ -20,6 +27,6 @@ for KVER in $kver; do
 done
 
 # NB: e2k kernel builds "image" instead of "vmlinuz"
-[ -f vmlinuz-$kver ] && ln -s vmlinuz-$kver vmlinuz ||:
-ln -s initrd-$kver.img initrd.img	# missing at this stage
+[ -f vmlinuz-$KVER ] && ln -s vmlinuz-$KVER vmlinuz ||:
+ln -s initrd-$KVER.img initrd.img	# missing at this stage
 :

features.in/kernel/config.mk

@@ -20,6 +20,7 @@ else
 endif
 endif
 endif
+	@$(call xport,KFLAVOURS)
 
 # r8168 is a kludge, never install it by default
 use/kernel/net:

features.in/uboot/image-scripts.d/90-uboot-config-install

@@ -1,12 +1,17 @@
 #!/bin/sh -x
 
-kver="$(rpm -qa 'kernel-image*' \
-            --qf '%{installtime} %{version}-%{name}-%{release}\n' \
-        | sort -n \
-        | cut -f 2 -d ' ' \
-        | sed 's/kernel-image-//')"
+[ -n "$GLOBAL_KFLAVOURS" ] ||
+  { echo "** KFLAVOURS is empty" >&2; exit 0; }
 
-[ -n "$kver" ] || { echo "** unable to deduce kernel version" >&2; exit 1; }
+kver=
+for KFLAVOUR in $GLOBAL_KFLAVOURS; do
+	kver+=" $(rpm -qa 'kernel-image*' \
+		--qf '%{version}-%{name}-%{release}\n' \
+	| grep "$KFLAVOUR" \
+	| sed 's/kernel-image-//')"
+done
+[ ! -z "${kver#"${kver%%[! ]*}"}" ] ||
+  { echo "** unable to deduce kernel version" >&2; exit 1; }
 
 for KVER in $kver; do
 	/sbin/installkernel --uboot --keep-initrd "$KVER"