[FS#1303] Attended Sysupgrade: brcm2708 target hasn't been converted to use the new image generation code yet

[LEDE Bugs]

The following task has a new comment added:

FS#1303 - Attended Sysupgrade: brcm2708 target hasn't been converted to use the new image generation code yet
User who did this - Christian Lamparter (chunkeey)

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>From what I can guess, there are currently two minor problems with attended-sysupgrade. Both should be easy to fix however

1. extend the [[https://github.com/aparcar/attendedsysupgrade-server/blob/c8684b12d7a0b95222eec8aea20608d2595ce0ed/worker/worker.py#L209|worker.py]] to look for more image types.

The RPIs use *-ext4-sdcard.img.gz. But I think this could be extended to *.img.gz to get the APM821XX MyBook Live as well.

2. The brcm27xx targets use multi-target images. So, the "board_name": "raspberrypi,3-model-b". needs to become "rpi-3". Luckily, it seems that the attended-sysupgrade project already has that infrastructure for this too.

[[https://github.com/aparcar/attendedsysupgrade-server/blob/e88bb84c7ff4f1e29fb0ffcf14bb5539e0895942/distributions/openwrt/snapshot.yml|snapshot.yml]. So I guess adding a "raspberrypi,3-model-b: rpi-3" would do the trick?!
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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=1303#comment4270