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WIP: Log details of artifact splitting when building 'compose' elements

Sam Thursfieldrequested to merge
sam/compose-log-splits into master

Artifact split rules are complicated to reason about. There needs to be some way of seeing why a 'compose' artifact included a given file.

The log file now contains a long message like this, listing every artifact, domain and file:

[--:--:--] INFO    [initramfs/initramfs.bst]: Composed 2369 files

    Integration
      - var/cache/ldconfig/aux-cache

    gnu-toolchain/binutils.bst runtime
      - usr/x86_64-unknown-linux-gnu
      - usr/x86_64-unknown-linux-gnu/bin/ar
      - usr/x86_64-unknown-linux-gnu/bin/as
      - usr/x86_64-unknown-linux-gnu/bin/ld

    gnu-toolchain/make.bst (not in any domain)
      - usr
      - usr/lib
      - usr/share

    ...

Size of the log files is a concern and it may be that in future we 'compress' some of these entries, e.g. if all files in a given directory come from one artifact then we just need to list the directory, not every filename.

Mailing list discussion: https://mail.gnome.org/archives/buildstream-list/2017-November/msg00012.html

Edited by Tristan Van Berkom

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