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Description of problem:
Dracut has a support for specifying device where the keyfile is stored. However, in initrd built with systemd the crypt module offloads unlocking to systemd-cryptsetup-generator and systemd-cryptsetup. Currently, systemd-cryptsetup-generator has a support for keyfile, however, it is not possible to specify that keyfile is stored on the external device.

Version-Release number of selected component (if applicable):
systemd-219-57.el7_5.1

How reproducible:
always

Steps to Reproduce:
1. man dracut.cmdline
2. Search for keydev option

Actual results:
Dracut manpage mentions option rd.luks.key=<keypath>:<keydev>:<luksdev.  However, if you look into man page for systemd-cryptsetup observe that keydev option is not supported.

Expected results:
systemd-cryptsetup-generator supports keydev option.


Additional info:
In dracut the keydev option is implemented using parse-keydev.sh and probe-keydev.sh scripts. These scripts are included in initrd image only if systemd module is not included.

https://github.com/dracutdevs/dracut/blob/master/modules.d/90crypt/module-setup.sh#L62

fix merged to staging branch -> https://github.com/lnykryn/systemd-rhel/pull/231 -> post

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2018:3245