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":["Upgrade incompatible. Please check Wiki ..."]
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. 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.
Signed-off-by: Adrian Schmutzler <freif...@adrianschmutzler.de>
---
Changes in v2:
- Add DEVICE_COMPAT_MESSAGE and reword comment for legacy warning.
---
include/image-commands.mk | 5 ++++-
package/base-files/files/lib/upgrade/fwtool.sh | 7 ++++++-
2 files changed, 10 insertions(+), 2 deletions(-)
diff --git a/include/image-commands.mk b/include/image-commands.mk
index 9da712e733..e21472a659 100644
--- a/include/image-commands.mk
+++ b/include/image-commands.mk
@@ -393,7 +393,10 @@ metadata_json = \
"metadata_version": "1.0", \
"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,$(VERSION_NUMBER))", \
diff --git a/package/base-files/files/lib/upgrade/fwtool.sh
b/package/base-files/files/lib/upgrade/fwtool.sh
index 1807aecd6d..59f981f6c3 100644
--- a/package/base-files/files/lib/upgrade/fwtool.sh
+++ b/package/base-files/files/lib/upgrade/fwtool.sh
@@ -51,7 +51,12 @@ fwtool_check_image() {
json_get_var compatmessage compat_message
[ -n "$imagecompat" ] || imagecompat="1.0"
- json_select supported_devices || return 1
+ # select correct supported list based on compat_version
+ # (using this ensures that compatibility check works for devices
+ # not knowing about compat-version)
+ local supported=supported_devices
+ [ "$imagecompat" != "1.0" ] && supported=new_supported_devices
+ json_select $supported || return 1
json_get_keys dev_keys
for k in $dev_keys; do
--
2.20.1
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