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config,storage: support populating directories from archives #1498

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config,storage: support populating directories from archives #1498

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Commits on Nov 13, 2022

  1. config,validate: allow config types to conflict based on key prefix 

    This allows some schema types to specify a key prefix for which keys
matching said prefix should conflict. This is used by a subsequent
commit where a directory is populated from an archive, and any file,
directory, or link whose path is under the original directory should
conflict.
    @Snaipe
    Snaipe committed Nov 13, 2022
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  2. config,storage: support populating directories from archives 

    Tarballs are ubiquitous as a binary release format, and without any
builtin ability to fetch, validate, and extract them, we are left
with half-baked hacks to do all of this from the confines of a oneshot
systemd service, or worse, extracting and providing the entirety of the
archive contents as files and directory entries in the ignition config,
resulting in very large json documents.

Let's not do this. Instead, this commit formalizes the use of archives
via adding a new (optional) "contents" key under a directory entry.

This new contents key is identical in function as its eponymous version
in the "files" entries, except that it incorporates a new "archive"
subkey to specify the archive format rather than guessing with
heuristics. Today, only "archive": "tar" is supported, though this
commit is structured to allow the addition of other archive types if
needed.
    @Snaipe
    Snaipe committed Nov 13, 2022
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