Sorry if this is off-topic for this mailing list. I am setting up a (Ubuntu 16.04) machine with dmcrypt+LUKS encrypted root system (standard Debian/Ubuntu recipe) but with added capability for remote entry of the passphrase (using dropbear via busybox shell). After the user has entered the passphrase (and it is piped into /lib/cryptsetup/passfifo) I would like an easy and preferably fast way for a local script (i.e. running under busybox ash shell) to detect whether the passphrase entry has been successful or not - without requiring local access or a second remote login. Thanks for any help.
Here's my very simple local script which I put at /etc/initramfs-tools/scripts and is then found upon boot at /scripts:
#!/bin/sh
read -sp"Enter passphrase, then press ENTER/RETURN: "
printf "$REPLY" >/lib/cryptsetup/passfifo
echo
# but did it work??? how to tell without local access or logging in a second time?
Dominic
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