* Removed block on use --cache-copy-layers with multistage builds
* Removed using digest in composite key with command COPY --from
* COPY --from command uses src as file context (only changed files will be reason for change hash)
* ARG and ENV changed before COPY dont change composite key
* Add and fix some tests
* Caching work same as caching in docker buildx
Co-authored-by: Sergei Kraev <skraev@tradingview.com>
This change only uploads layers that were created from cache misses on RUN commands.
It also improves the cache-checking logic to handle this case.
Finally, it makes cache layer uploads happen in parallel with the rest of the build, logging
a warning if any fail.
This is the final part of an optimization that I've been refactoring towards for awhile.
If the Dockerfile consists of no RUN commands, or cached RUN commands, followed by metadata-only
operations, we can skip downloading and unpacking the base image.
This change fixes that by properly "replaying" the Dockerfile and mutating the config when
calculating cache keys. Previously we were looking at the wrong cache key for each command
when there was more than one.
* Rework cache key generation a bit.
Cache keys are now based on the previous commands, rather than the previous state
of the filesystem.
* Refactor command interface a bit, only cache the context for commands that use it.
Massimeddu Cireddu
Kraev Sergei
Tejal Desai
Tejal Desai
Don McCasland
dlorenc