CRYPTSETUP-FVAULT2DUMP(8) Maintenance Commands CRYPTSETUP-FVAULT2DUMP(8)
cryptsetup-fvault2Dump - dump the header information of a FVAULT2 (FileVault2 compatible) device
cryptsetup fvault2Dump [<options>] <device>
Dump the header information of a FVAULT2 (FileVault2 compatible) device. If the --dump-volume-key option is used, the FVAULT2 device volume key is dumped instead of header information. You have to provide password or keyfile to dump volume key. Beware that the volume key can be used to decrypt the data stored in the container without a passphrase. This means that if the volume key is compromised, the whole device has to be erased to prevent further access. Use this option carefully. <options> can be [--dump-volume-key, --volume-key-file, --key-file, --keyfile-offset, --keyfile-size, --timeout].
--key-file, -d name Read the passphrase from file. If the name given is "-", then the passphrase will be read from stdin. In this case, reading will not stop at newline characters. See section NOTES ON PASSPHRASE PROCESSING in cryptsetup(8) for more information. --keyfile-offset value Skip value bytes at the beginning of the key file. --keyfile-size, -l value Read a maximum of value bytes from the key file. The default is to read the whole file up to the compiled-in maximum that can be queried with --help. Supplying more data than the compiled-in maximum aborts the operation. This option is useful to cut trailing newlines, for example. If --keyfile-offset is also given, the size count starts after the offset. --volume-key-file, --master-key-file (OBSOLETE alias) Use a volume key stored in a file. The volume key is stored in a file instead of being printed out to standard output. --dump-volume-key, --dump-master-key (OBSOLETE alias) Print the volume key in the displayed information. Use with care, as the volume key can be used to bypass the passphrases, see also option --volume-key-file. --timeout, -t <number of seconds> The number of seconds to wait before timeout on passphrase input via terminal. It is relevant every time a passphrase is asked. It has no effect if used in conjunction with --key-file. This option is useful when the system should not stall if the user does not input a passphrase, e.g. during boot. The default is a value of 0 seconds, which means to wait forever. --batch-mode, -q Suppresses all confirmation questions. Use with care! If the --verify-passphrase option is not specified, this option also switches off the passphrase verification. --debug or --debug-json Run in debug mode with full diagnostic logs. Debug output lines are always prefixed by #. If --debug-json is used, additional LUKS2 JSON data structures are printed. --version, -V Show the program version. --usage Show short option help. --help, -? Show help text and default parameters.
Report bugs at cryptsetup mailing list <firstname.lastname@example.org> or in Issues project section <https://gitlab.com/cryptsetup/cryptsetup/-/issues/new>. Please attach output of the failed command with --debug option added.
Cryptsetup FAQ <https://gitlab.com/cryptsetup/cryptsetup/wikis/FrequentlyAskedQuestions> cryptsetup(8), integritysetup(8) and veritysetup(8)
Part of cryptsetup project <https://gitlab.com/cryptsetup/cryptsetup/>. This page is part of the Cryptsetup ((open-source disk encryption)) project. Information about the project can be found at ⟨https://gitlab.com/cryptsetup/cryptsetup⟩. If you have a bug report for this manual page, send it to email@example.com. This page was obtained from the project's upstream Git repository ⟨https://gitlab.com/cryptsetup/cryptsetup.git⟩ on 2023-06-23. (At that time, the date of the most recent commit that was found in the repository was 2023-06-22.) If you discover any rendering problems in this HTML version of the page, or you believe there is a better or more up-to-date source for the page, or you have corrections or improvements to the information in this COLOPHON (which is not part of the original manual page), send a mail to firstname.lastname@example.org cryptsetup 2.6.1-git 2022-12-14 CRYPTSETUP-FVAULT2DUMP(8)
Pages that refer to this page: cryptsetup(8)