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nwconn: persist additional AFP metadata attributes
Extend the conservative AFP 2.0 Set File Information smoke path to accept the metadata-only System and Backup file attribute bits alongside the already-supported Finder Invisible bit.

The WebSDK/NWAFP Set File Information request uses the file Attributes bitmap to pass a set/clear attribute word. Netatalk stores several AFP file attributes in AppleDouble metadata while computing open-fork state dynamically and leaving enforcement-sensitive bits to the file/fork paths. Mirror only the low-risk mars_nwe subset here: persist Invisible, System, and Backup in the private org.mars-nwe.afp.attributes xattr, and keep NoWrite, NoRename, NoDelete, NoCopy, data-fork-open, resource-fork-open, timestamps, resource forks, and Entry-ID-only write semantics rejected until they have deliberate enforcement and backend design.

The xattr payload remains versioned and unchanged. Reads now expose the three supported metadata bits through Get/Scan File Information, and writes preserve the existing set/clear semantics over the supported mask.

Update the Linux Set File Information smoke helper with --system/--clear-system and --backup/--clear-backup options, while keeping the smoke-suite default unchanged. Document the expected Linux xattr forms 0x01000004 and 0x01000040 for those optional probes.

Tests: git diff --check; gcc -Iinclude -I/mnt/data/stubs -fsyntax-only tests/linux/afp_set_file_info_smoke.c.
2026-05-30 12:55:25 +02:00
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