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This PR is a replacement for #2947 (cherry-picking that commit for consistency, so that calling
Evaluate
over each ref in a result is the same as settingEvaluate: true
in theSolveRequest
).This can be invoked on a ref using
ref.Evaluate()
in a frontend - this allows for on-demand unlazying a reference, instead of needing to wait until export. Previously, as a hack, this could be done usingStatFile
, however this has the disadvantage of needing to pull the image to be able to mount it, which isn't required to ensure that the image is unlazied.Additionally, the previous
Evaluate
field in theSolveRequest
was not sufficient, as this causes theSolve
to block - we may want to perform other operations, before then determining whether toEvaluate
, as in docker/buildx#1197.