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Now that images are not linux-specific,
we can move all image-related logic directly into prog package
and significantly simplify the logic.
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This will allow us to mutate the image size.
Fixes #3527
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It is an external test. It uses only exported "linux" package functions.
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Asset storage is now significantly simpler: we just take the
Base64-encoded, compressed image and output it to a file. There is a
slight overhead in that we decompress from the `zlib` format and
re-compress to the `gzip` format.
This commit removes most of the logic from `init_images.go`,
and therefore most of the tests from `init_images_test.go`.
We could instead keep this logic around and use it to adapt old-style
`syz_mount_image` calls in existing corpuses to match the new format.
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Ideally, we should properly support the already existing fix flag to
distinguish between fixing and checking, but for now at least let it
control whether structural changes are to be made.
Otherwise we get into trouble while hint-mutating syz_mount_image calls,
because we iterate over all call arguments and (possibly) remove them at
the same time. It leads to `bad group arg size %v, should be <= %v for
%#v type %#v` errors.
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To simplify the extraction code, let's make segments non-overlapping
even before execution.
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It will simplify the C code and let us extract the raw images in a more
convenient way.
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