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authorAdrian Schmutzler <freifunk@adrianschmutzler.de>2020-07-09 19:46:44 +0200
committerAdrian Schmutzler <freifunk@adrianschmutzler.de>2020-07-31 11:40:15 +0200
commit02d6ac1060b4a937adce5912cc22177cac86c318 (patch)
tree53478401e7ed3933d1b8314f1212d8c96303cc73 /include
parentad3e1f9db4cffaec6700d780308fb6241c09a96f (diff)
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base-files: fwtool: make compat_version backward compatible
So far, the compatibility mechanism only works if both device and image are already updated to the new routines. This patch extends the sysupgrade metadata and fwtool_check_image() to account for "older" images as well: The basic mechanism for older devices to check for image compatibility is the supported_devices entry. This can be exploited by putting a custom message into this variable of the metadata, so older FW will produce a mismatch and print the message as it thinks it's the list of supported devices. So, we have two cases: device 1.0, image 1.0: The metadata will just contain supported_devices as before. device 1.0, image 1.1: The metadata will contain: "new_supported_devices":["device_string1", "device_string2", ...], "supported_devices":["Image version 1.1 incompatible to device: ..."] If the device is "legacy", i.e. does not have the updated fwtool.sh, it will just fail with image check and print the content of supported_devices. If DEVICE_COMPAT_MESSAGE is set, this will be printed on old devices as well through the same mechanism. Otherwise a generic "Please check documentation ..." is appended. Upgrade can still be performed with -F like when SUPPORTED_DEVICES has been removed to prevent bricking. If the device has updated fwtool.sh (but is 1.0), it will just use the new_supported_devices instead, and work as intended (flashing with -n will work, flashing without will print the appropriate warning). This mechanism should provide a fair tradeoff between simplicity and functionality. Since we touched a lot of fields in metadata, this also bumps metadata_version to 1.1. Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
Diffstat (limited to 'include')
-rw-r--r--include/image-commands.mk7
1 files changed, 5 insertions, 2 deletions
diff --git a/include/image-commands.mk b/include/image-commands.mk
index 9da712e733..7a370034c8 100644
--- a/include/image-commands.mk
+++ b/include/image-commands.mk
@@ -390,10 +390,13 @@ json_quote=$(subst ','\'',$(subst ",\",$(1)))
metadata_devices=$(if $(1),$(subst "$(space)","$(comma)",$(strip $(foreach v,$(1),"$(call json_quote,$(v))"))))
metadata_json = \
'{ $(if $(IMAGE_METADATA),$(IMAGE_METADATA)$(comma)) \
- "metadata_version": "1.0", \
+ "metadata_version": "1.1", \
"compat_version": "$(call json_quote,$(compat_version))", \
$(if $(DEVICE_COMPAT_MESSAGE),"compat_message": "$(call json_quote,$(DEVICE_COMPAT_MESSAGE))"$(comma)) \
- "supported_devices":[$(call metadata_devices,$(SUPPORTED_DEVICES))], \
+ $(if $(filter-out 1.0,$(compat_version)),"new_supported_devices":[$(call metadata_devices,$(SUPPORTED_DEVICES))]$(comma)) \
+ $(if $(filter-out 1.0,$(compat_version)),"supported_devices": \
+ ["$(call json_quote,Image version $(compat_version) incompatible to device: $(if $(DEVICE_COMPAT_MESSAGE),$(DEVICE_COMPAT_MESSAGE),Please check documentation ...))"]$(comma)) \
+ $(if $(filter 1.0,$(compat_version)),"supported_devices":[$(call metadata_devices,$(SUPPORTED_DEVICES))]$(comma)) \
"version": { \
"dist": "$(call json_quote,$(VERSION_DIST))", \
"version": "$(call json_quote,$(VERSION_NUMBER))", \