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[LittleBoy <ca-launchpad@xxxxxxxxx>]

** Attachment added: "Fixes usage of printf"
   http://launchpadlibrarian.net/19385911/fix-printf.patch

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ecryptfs-setup-private does not support login passphrases starting with a minus
https://bugs.launchpad.net/bugs/294133
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Status in “ecryptfs-utils” source package in Ubuntu: New

Bug description:
Binary package hint: ecryptfs-utils

ecryptfs-setup-private check the login passphrase with 

line 156: printf "$LOGINPASS\0" | /sbin/unix_chkpwd

This does not work when the login passphrase starts with a minus, e.g. -test-

merlin@Spike:~$ ecryptfs-setup-private 
Enter your login passphrase: 
printf: 156: Illegal option -m

Solution:
Use
printf -- "$LOGINPASS\0" instead