FWIW rescue mode actually works OK without this - it can mount encrypted installs, at
least, as it uses blivet to do it. Once you have the installed system mounted you can use
the cryptsetup it contains.
If for whatever reason you wanted to set up or manipulate an encrypted device from the
rescue environment yourself using the cryptsetup tools, though, you could not.
This should certainly fix the upgrade.img case, though - I don't know whether this is
the most-correct way to do it or not, but it should certainly work, so +1 from me for
that.
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To view this pull request on github, visit
https://github.com/rhinstaller/lorax/pull/14