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do we need the
$at the end of the line? Also I feel like a more efficient way to check this is:otherwise grep will check every single file in the snap
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The
$ensures that the test will fail if thesnapdbinary is replaced by a directory (like/usr/lib/snapd/snapd/foo), which is highly unlikely but it still makes the test more robust, so I'd vote for keeping it. Your suggestion about limiting the filtering in unsquashfs itself is also good.