src/update_handler: support *.bin for u-boot emmc-boot image

[hthiery]

Since a common name for U-Boot binaries is flash.bin or u-boot.bin add support for the "*.bin" suffix for the emmc-boot type.

[ejoerns]

Sounds reasonable to me.

[a3f]

This would resolve #1009, but @jluebbe had concerns about this :

As mentioned in #1009 (comment), we don't want to add more broad matches here. The easy fix is to name rename the images to .img in your build system. Even if we allow .bin now, that would only set a precedent for things like .raw or any other file extension that people like to use for images.

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (966a86b) 80.28% compared to head (789385f) 80.28%.
Report is 4 commits behind head on master.

Additional details and impacted files

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##           master    #1201   +/-   ##
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  Coverage   80.28%   80.28%           
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  Files          58       58           
  Lines       18000    18000           
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  Hits        14451    14451           
  Misses       3549     3549           

Files Changed	Coverage Δ
src/update_handler.c	64.12% <ø> (ø)

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[Paiusco]

@a3f I think would also add precedent towards #1177 as well...

[ejoerns]

I would differentiate between the renaming applied by integration tools and very common original names set by the generating tools. We allow .ext4 for ext4 images since this is the common extension.
I guess arguing that U-Boot is some kind of widespread embedded bootloader is not fully wrong... thus one could argue that .bin is a very common extension for bootloaders.
But on the other hand, I do not have a very strong opinion on this.

Also, if I understand @jluebbe in #1009 correctly, he was referring to 'broad matches' like "*" for "boot-emmc" or "*.bin" for all slot types. Explicitly handling "*.bin" for "boot-emmc" does not appear to be a 'broad match' to me.

[jluebbe]

Instead of adding more and more extension matches, perhaps an explicit option in the manifest to set the file type would be better.