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World-writable directories are not appropriate for some systems, so
offer a choice of single-user-writable and world-writable modes, with
single-user-writable being the default. Add a new documentation section
to help users decide which one to use.
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Use %q, in case the paths contain whitespace. Also clean the directory
path to remove trailing slashes before appending the ".new" suffix.
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In checkEncryptable(), check whether the directory is already encrypted
before checking whether it's empty.
Also improve the error message for when a directory is nonempty.
Finally, translate keyring.ErrKeyAddedByOtherUsers and
keyring.ErrKeyFilesOpen into errors which include the directory.
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ErrBadOwners:
Rename to ErrDirectoryNotOwned for clarity, move it from
cmd/fscrypt/ to metadata/ where it better belongs, and improve
the message.
ErrEncrypted:
Rename to ErrAlreadyEncrypted for clarity, and include the path.
ErrNotEncrypted:
Include the path.
ErrBadEncryptionOptions:
Include the path and bad options.
ErrEncryptionNotSupported:
ErrEncryptionNotEnabled:
Don't wrap with "get encryption policy %s", in preparation for
wrapping these with filesystem-level context instead.
Also avoid mixing together the error handling for the "get policy" and
"set policy" ioctls. Make it very clear how we're handling the errors
from each ioctl.
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Add general tests for 'fscrypt encrypt'. For protector-specific tests,
see t_encrypt_custom, t_encrypt_login, and t_encrypt_raw_key.
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