Squashing from layer n to m? #165
Description
Hello,
I recently saw some projects using relatively large base images, such as wnameless/oracle-xe-11g, adding additional layers, e.g. by inserting test-data or some specific configuration. As they are frequently used to run tests in CI environments or as local development environments reflecting a production-closer setup, they are committed to some registry. In these cases using docker-squash compresses everything nicely into one layer but creates one huge layer that needs to be pushed to and pulled from the registry, even if only a small configuration was changed in layer X (X>1). In situations like this, it could make sense to squash only from layer n to m and thereby avoid the download of a layer containing the base image over and over again, even though that one didn't change.
Cheers,
Moritz