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feat(90crypt): add support for AF_UNIX key files
systemd v248 introduced support for using AF_UNIX stream sockets as key files in /etc/crypttab. This commit enhances the 90crypt module to identify socket units with matching socket file paths. It then includes the first matching socket unit along with its corresponding service unit. This correspondence is determined by checking the Service= option in the socket unit or, if that's not available, by replacing the .socket suffix with either @.service or .service, depending on the Accept= option (see man page for systemd.socket). Futhermore, this functionality handles sockets located under /run/cryptsetup-keys.d/, which are automatically discoverable by the systemd-cryptsetup utility when the key file field in /etc/crypttab is empty.
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