Add support for using vermagic the same as in the official firmware

include/feeds.mk

@@ -35,6 +35,9 @@ define FeedSourcesAppend
 	echo 'src/gz %d_base %U/packages/%A/base'; \
 	$(if $(filter %SNAPSHOT-y,$(VERSION_NUMBER)-$(CONFIG_BUILDBOT)), \
 		echo 'src/gz %d_kmods %U/targets/%S/kmods/$(LINUX_VERSION)-$(LINUX_RELEASE)-$(LINUX_VERMAGIC)';) \
+	$(if $(filter %SNAPSHOT,$(VERSION_NUMBER)), \
+		$(if $(wildcard $(TOPDIR)/vermagic-$(BOARD)-$(SUBTARGET)-$(VERSION_NUMBER).list), \
+			echo 'src/gz %d_kmods %U/targets/%S/kmods/$(LINUX_VERSION)-$(LINUX_RELEASE)-$(LINUX_VERMAGIC)';)) \
 	$(foreach feed,$(FEEDS_AVAILABLE), \
 		$(if $(CONFIG_FEED_$(feed)), \
 			echo '$(if $(filter m,$(CONFIG_FEED_$(feed))),# )src/gz %d_$(feed) %U/packages/%A/$(feed)';)))) \

include/kernel-defaults.mk

@@ -107,6 +107,7 @@ define Kernel/Configure/Default
 	}
 	$(_SINGLE) [ -d $(LINUX_DIR)/user_headers ] || $(KERNEL_MAKE) INSTALL_HDR_PATH=$(LINUX_DIR)/user_headers headers_install
 	grep '=[ym]' $(LINUX_DIR)/.config.set | LC_ALL=C sort | mkhash md5 > $(LINUX_DIR)/.vermagic
+	$(SCRIPT_DIR)/getvermagic.sh "$(BOARD)" "$(SUBTARGET)" "$(VERSION_NUMBER)" $(LINUX_VERSION) $(LINUX_RELEASE) "$(LINUX_DIR)/.vermagic"
 endef
 
 define Kernel/Configure/Initramfs

scripts/getvermagic.sh

@@ -0,0 +1,67 @@
+#!/usr/bin/env bash
+
+BOARD=$1
+SUBTARGET=$2
+VERSION_NUMBER=$3
+LINUX_VERSION=$4
+LINUX_RELEASE=$5
+OUTFILE=$6
+
+if [ -t 8 ]; then
+	BUILD_STATE=true
+	OUTPUT_PIPE=8
+else
+	BUILD_STATE=false
+	OUTPUT_PIPE=2
+fi
+
+log_msg() {
+	printf "%s\n" "$1" >&$OUTPUT_PIPE
+}
+
+log_err() {
+	local msg="$1"
+	local _Y _R _N
+	if [ "$IS_TTY" == "1" -a "$NO_COLOR" != "1" ]; then
+		_Y=\\033[33m
+		_R=\\033[31m
+		_N=\\033[m
+	fi
+	printf "$_R%s$_N\n" "$msg" >&$OUTPUT_PIPE
+}
+
+die() {
+	log_err "$1"
+	exit 1
+}
+
+if [ -z "$VERSION_NUMBER" ]; then
+	version_file="$TOPDIR/include/version.mk"
+	VERSION_NUMBER=$( grep -o -P '(?<=,\$\(VERSION_NUMBER\),).*(?=\))' $version_file 2>/dev/null )
+fi
+[ -z "$VERSION_NUMBER" ] && die "Cannot determine VERSION_NUMBER"
+
+vermagic_file="$TOPDIR/vermagic-$BOARD-$SUBTARGET-$VERSION_NUMBER.list"
+if [ ! -f "$vermagic_file" ]; then
+	log_msg "Using standard vermagic"
+	exit 0
+fi
+
+KERNEL_VER=$LINUX_VERSION-$LINUX_RELEASE
+vermagic=$( grep -o -P "(?<=$KERNEL_VER-).*" $vermagic_file 2>/dev/null )
+
+if [ -z "$vermagic" ]; then
+	die "Cannot found vermagic for kernel $KERNEL_VER"
+fi
+if [ "$( echo "$vermagic" | wc -l )" -gt 1 ]; then
+	log_msg "Found a few vermagic for kernel $KERNEL_VER"
+fi
+vermagic=$( echo "$vermagic" | sed -n '1p' )
+log_msg "vermagic = $vermagic"
+
+if [ -n "$OUTFILE" ]; then
+	echo $vermagic > "$OUTFILE"
+else
+	echo $vermagic
+fi
+

vermagic_update.sh

@@ -0,0 +1,81 @@
+#!/usr/bin/env bash
+
+SCRIPT_DIR=$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )
+
+BOARD=$1
+SUBTARGET=$2
+OUTDIR=$3
+
+[ -z "$OUTDIR" ] && OUTDIR=$SCRIPT_DIR
+
+log_msg() {
+	printf "%s\n" "$1"
+}
+
+log_err() {
+	local _Y="\\033[33m"
+	local _R="\\033[31mERROR: "
+	local _N="\\033[m"
+	printf "$_R%s$_N\n" "ERROR: $1"
+}
+
+die() {
+	log_err "$1"
+	exit 1
+}
+
+#rm -f $OUTDIR/vermagic-*.list 2>/dev/null
+
+config_file="$OUTDIR/.config"
+#CONFIG_TARGET_BOARD="ipq806x"
+#CONFIG_TARGET_SUBTARGET="generic"
+
+if [ -z "$BOARD" ]; then
+	[ ! -f $config_file ] && die "File '.config' not found"
+	BOARD=$( grep -o -P '(?<=CONFIG_TARGET_BOARD=").*(?=")' $config_file 2>/dev/null )
+	[ -z "$BOARD" ] && die "Cannot determine BOARD"
+fi
+if [ -z "$SUBTARGET" ]; then
+	[ ! -f $config_file ] && die "File '.config' not found"
+	SUBTARGET=$( grep -o -P '(?<=CONFIG_TARGET_SUBTARGET=").*(?=")' $config_file 2>/dev/null )
+	[ -z "$SUBTARGET" ] && die "Cannot determine SUBTARGET"
+fi
+
+rm -f $OUTDIR/vermagic-$BOARD-$SUBTARGET*.list 2>/dev/null
+
+#kernel_ver_file="$OUTDIR/include/kernel-version.mk"
+#LINUX_RELEASE?=1
+#LINUX_KERNEL_HASH-5.4.154 = 058994f4666b6b0474a4d5228583e394594e406783b7e93d487c2a66c35f3c06 
+
+#LINUX_VERSION=$( grep -o -P '(?<=LINUX_KERNEL_HASH-).*(?=\ =\ )' $kernel_ver_file 2>/dev/null )
+#LINUX_VERSION=$( echo "$LINUX_VERSION" | xargs )
+#[ -z "$LINUX_VERSION" ] && die "Cannot determine kernel version"
+#echo "LINUX_VERSION = '$LINUX_VERSION'"
+
+#LINUX_RELEASE=$( grep -o -P '(?<=LINUX_RELEASE\?=).*' $kernel_ver_file 2>/dev/null )
+#LINUX_RELEASE=$( echo "$LINUX_RELEASE" | xargs )
+#[ -z "$LINUX_RELEASE" ] && die "Cannot determine kernel release number"
+#echo "LINUX_RELEASE = '$LINUX_RELEASE'"
+
+version_file="$OUTDIR/include/version.mk"
+#VERSION_NUMBER:=$(if $(VERSION_NUMBER),$(VERSION_NUMBER),21.02.1)
+#VERSION_REPO:=$(if $(VERSION_REPO),$(VERSION_REPO),https://downloads.openwrt.org/releases/21.02.1)
+
+VERSION_NUMBER=$( grep -o -P '(?<=,\$\(VERSION_NUMBER\),).*(?=\))' $version_file 2>/dev/null )
+[ -z "$VERSION_NUMBER" ] && die "Cannot determine VERSION_NUMBER"
+#echo "VERSION_NUMBER = '$VERSION_NUMBER'"
+
+VERSION_REPO=$( grep -o -P '(?<=,\$\(VERSION_REPO\),http).*(?=\))' $version_file 2>/dev/null )
+[ -z "$VERSION_REPO" ] && die "Cannot determine VERSION_REPO"
+VERSION_REPO=http$VERSION_REPO
+#echo "VERSION_REPO = '$VERSION_REPO'"
+
+kmods_url=$VERSION_REPO/targets/$BOARD/$SUBTARGET/kmods/
+kmods=$( curl -s $kmods_url )
+[ -z "$kmods" ] && die "Cannot download WEB-page from '$kmods_url'"
+vermagic=$( echo "$kmods" | grep '<tr><td class="' 2>/dev/null | sed -e 's/.*href="//;s/\/">.*//' 2>/dev/null )
+[ -z "$vermagic" ] && die "Cannot found kmods on '$kmods_url'"
+
+vermagic_file=vermagic-$BOARD-$SUBTARGET-$VERSION_NUMBER.list
+echo "$vermagic" > $OUTDIR/$vermagic_file && log_msg "File '$vermagic_file' updated."
+