The arch parser keeps tar member names verbatim. The index writer joins
those values one per line into the pacman database. So a member name
with a newline adds lines to that package's own `files` entry, which
libalpm reads as further fields.
The scope is one package record. An uploader cannot forge entries for
another package, and can set the same fields in `.PKGINFO` anyway. This
is input validation, not a privilege boundary.
`ParsePackage` now drops names that contain CR or LF. `joinFields` drops
such values again when writing the index, which also covers packages
that are already stored. Real packages never carry newlines in file
paths, so well-formed uploads are unaffected.
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Co-authored-by: silverwind <me@silverwind.io>
metsw24-max