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dap: improve location resolution for duplicate digests #3408
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This improves location resolution for duplicate digests by making some assumptions about the file structure to determine a "best match" when there are multiple possible locations. It uses the next operation (that this digest is the input for) to determine a location. If the location of the current operation is before the next operation, this location is preferred. If there are multiple locations that happen before the next operation, the one closest to the next operation (aka later in the file) is used instead. This resolves the most common case of multiple identical `FROM` statements without adding more code to the frontends themselves. Signed-off-by: Jonathan A. Sternberg <jonathan.sternberg@docker.com>
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tonistiigi
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Sep 10, 2025
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This improves location resolution for duplicate digests by making some
assumptions about the file structure to determine a "best match" when
there are multiple possible locations.
It uses the next operation (that this digest is the input for) to
determine a location. If the location of the current operation is before
the next operation, this location is preferred. If there are multiple
locations that happen before the next operation, the one closest to the
next operation (aka later in the file) is used instead.
This resolves the most common case of multiple identical
FROMstatements without adding more code to the frontends themselves.
Related to #3404.