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Don't recreate cached layers #715

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wants to merge 8 commits into from
Closed

Don't recreate cached layers #715

wants to merge 8 commits into from

Commits on Sep 20, 2019

  1. Don't recreate cached layers 

    This caching optimization reuses existing layer from a cache image for a
RUN command instead of unpacking it and recreating.  It also helps with
multi-stage build caching issues - when recreating cached layers, some
attributes like timestamps are not recreated and the digest for the new
first stage image was different, breaking caching for subsequent stages.
    @eyusupov
    eyusupov committed Sep 20, 2019
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  2. Optimize FS snapshotting 

    Defer FS state setup until the first cache miss.  Cached commands are
now uniformly handled by extracting the layer from the cached image.
This allows skipping layers unpacking uniformly when they are not
required for the stage build.
    @eyusupov
    eyusupov committed Sep 20, 2019
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  3. Log base image digest

    @eyusupov
    eyusupov committed Sep 20, 2019
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  4. Do not lookup cache images when caching is disabled

    @eyusupov
    eyusupov committed Sep 20, 2019
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  5. Cache workdir command 

    It needs unpacked FS to check if the workdir exists.
Also it can break caching keys if the workdir did not exist.
    @eyusupov
    eyusupov committed Sep 20, 2019
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  6. Add more logging

    @eyusupov
    eyusupov committed Sep 20, 2019
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  7. Handle SingleSnaphot option

    @eyusupov
    eyusupov committed Sep 20, 2019
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  8. Handle volumes

    @eyusupov
    eyusupov committed Sep 20, 2019
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