47 lines
1.7 KiB
Markdown
47 lines
1.7 KiB
Markdown
# APPLE-FINDER-HINTS
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The Apple Finder (and other subsystems) seem to probe for a few
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files at the root of the filesystems to get a hint about the
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behaviour they should show processing this filesystem.
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It also looks for files with extra localization information in
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every directory, and for resource fork data (the `._` files).
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## FILES
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- `.metadata_never_index`
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prevents the system from indexing all of the data
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- `.ql_disablethumbnails`
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prevent the system from downloading all files that look like an
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image or a video to create a thumbnail
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- `.ql_disablecache`
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not really sure but it sounds useful
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The `.ql_` files are configuration for the "QuickLook" functionality
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of the Finder.
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The `.metadata_never_index` file appears to be a hint for the
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Spotlight indexing system.
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Additionally, the Finder probes for a `.localized` file in every
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directory it encounters, and it does a PROPSTAT for every file
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in the directory prefixed with `._`.
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## OPTIMIZATIONS
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For a macOS client we return the metadata for a zero-sized file if it
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does a PROPSTAT of `/.metadata_never_index` or `/.ql_disablethumbnails`.
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We always return a 404 Not Found for a PROPSTAT of any `.localized` file.
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Furthermore, we disallow moving, removing etc of those files. The files
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do not show up in a PROPSTAT of the rootdirectory.
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If a PROPFIND with `Depth: 1` is done on a directory, we add the
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directory pathname to an LRU cache, and the pathname of each file of
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which the name starts with `._`. Since we then know which `._` files
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exist, it is easy to return a fast 404 for PROPSTAT request for `._`
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files that do not exist. The cache is kept consistent by checking
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the timestamp on the parent directory, and a timeout.
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