- stereoscope builds a squashed tree for every layer, each a full copy of the one below, so memory
grows with layers x files. The squashed scope only ever reads the top one.
- new `GetSourceConfig.WithImageSquashOnly(bool)` (and `sourceproviders.Config` field) reads images
with stereoscope's `image.WithImageSquashOnly`, scoped to that one read
- the CLI turns it on when `--scope squashed` (the default)
- an image source read this way returns an error from `FileResolver` for `all-layers` and
`deep-squashed` instead of panicking on the missing layer squashes
Signed-off-by: Alex Goodman <wagoodman@users.noreply.github.com>
Alex Goodman
guangwu
Keith Zantow