[source] base-files: validate metadata of sysupgrade images

[LEDE Commits]

nbd pushed a commit to source.git, branch master:
https://git.lede-project.org/cc853810a4aae04f1afcad3439bf9db6fc1f4852

commit cc853810a4aae04f1afcad3439bf9db6fc1f4852
Author: Felix Fietkau <nbd at nbd.name>
AuthorDate: Mon Nov 14 17:30:51 2016 +0100

    base-files: validate metadata of sysupgrade images
    
    Use fwtool to extract it, only require metadata to be present if the
    platform sysupgrade script sets REQUIRE_IMAGE_METADATA=1
    
    Image metadata is in JSON format and contains a list of supported
    devices, along with version information that could be displayed by a UI
    later before the actual upgrade happens.
    
    Signed-off-by: Felix Fietkau <nbd at nbd.name>
---
 package/base-files/Makefile                    |  2 +-
 package/base-files/files/lib/upgrade/fwtool.sh | 40 ++++++++++++++++++++++++++
 package/base-files/files/sbin/sysupgrade       |  3 +-
 3 files changed, 43 insertions(+), 2 deletions(-)

diff --git a/package/base-files/Makefile b/package/base-files/Makefile
index ef62db2..637d88b 100644
--- a/package/base-files/Makefile
+++ b/package/base-files/Makefile
@@ -30,7 +30,7 @@ endif
 define Package/base-files
   SECTION:=base
   CATEGORY:=Base system
-  DEPENDS:=+netifd +libc +procd +jsonfilter +SIGNED_PACKAGES:usign +SIGNED_PACKAGES:lede-keyring +fstools
+  DEPENDS:=+netifd +libc +procd +jsonfilter +SIGNED_PACKAGES:usign +SIGNED_PACKAGES:lede-keyring +fstools +fwtool
   TITLE:=Base filesystem for Lede
   URL:=http://openwrt.org/
   VERSION:=$(PKG_RELEASE)-$(REVISION)
diff --git a/package/base-files/files/lib/upgrade/fwtool.sh b/package/base-files/files/lib/upgrade/fwtool.sh
new file mode 100644
index 0000000..984c173
--- /dev/null
+++ b/package/base-files/files/lib/upgrade/fwtool.sh
@@ -0,0 +1,40 @@
+fwtool_pre_upgrade() {
+	fwtool -q -i /dev/null "$1"
+}
+
+fwtool_check_image() {
+	[ $# -gt 1 ] && return 1
+
+	. /usr/share/libubox/jshn.sh
+
+	if ! fwtool -q -i /tmp/sysupgrade.meta "$1"; then
+		echo "Image metadata not found"
+		[ "$REQUIRE_IMAGE_METADATA" = 1 ] && return 1
+		return 0
+	fi
+
+	json_load "$(cat /tmp/sysupgrade.meta)" || {
+		echo "Invalid image metadata"
+		return 1
+	}
+
+	device="$(cat /tmp/sysinfo/board_name)"
+
+	json_select supported_devices || return 1
+
+	json_get_keys dev_keys
+	for k in $dev_keys; do
+		json_get_var dev "$k"
+		[ "$dev" = "$device" ] && return 0
+	done
+
+	echo "Device $device not supported by this image"
+	echo -n "Supported devices:"
+	for k in $dev_keys; do
+		json_get_var dev "$k"
+		echo -n " $dev"
+	done
+	echo
+
+	return 1
+}
diff --git a/package/base-files/files/sbin/sysupgrade b/package/base-files/files/sbin/sysupgrade
index 2f441f8..c095ca8 100755
--- a/package/base-files/files/sbin/sysupgrade
+++ b/package/base-files/files/sbin/sysupgrade
@@ -128,7 +128,8 @@ add_overlayfiles() {
 }
 
 # hooks
-sysupgrade_image_check="platform_check_image"
+sysupgrade_image_check="fwtool_check_image platform_check_image"
+sysupgrade_pre_upgrade="fwtool_pre_upgrade"
 [ $SAVE_OVERLAY = 0 -o ! -d /overlay/etc ] && \
 	sysupgrade_init_conffiles="add_uci_conffiles" || \
 	sysupgrade_init_conffiles="add_overlayfiles"