I am running CentOS 7.6 with the Mate desktop from epel. When I plug in a USB device such as a flash drive or hard drive which is encrypted with cryptsetup/LUKS I am presented with a dialog "Enter a passphrase to unlock the volume." This is cool except...

As part of my backup scheme I am archiving important files to an encrypted hard drive. I have a script which will:

1 - unlock the encrypted file system using a key-file
2 - mount the now unlocked file system located at /dev/mapper/backup
3 - perform various housekeeping and backup tasks
4 - unmount the backup file system
5 - relock the encrypted file system
6 - (will add this step) power down the USB drive to allow it to be disconnected

This works OK except that when the "Enter a passphrase..." dialog is present and I run the script I get a notification window "Unable to mount (file system label) - Operation was cancelled." However, the file system was in fact unlocked, mounted etc. The problem is that I have two unnecessary dialogs which I need to respond to/windows to close.

If I use dconfeditor and navigate to org/mate/desktop/media-handling/ and disable automount the above described issue is resolved. BUT... now the OS will not automount non-encrypted flash drives etc. I am not sure which is more of a pain

What I am looking for is a way to disable just the passphrase dialog. Any ideas?

TIA,

Ken

So, I think you are getting "Enter a passphrase dialogue box" because OS is trying to automount the encrypted USB drive...
Found this; it may work? https://www.linuxquestions.org/quest...ve-4175567760/

Thanks dc.901,

That sounded like a great idea. However, in CentOS 7.6 it does not seem to work. My fstab line is The man page tells me that the noauto optionI guess the USB mounting process uses something different.

The more I think about it the more I like the idea of turning automount off in dconf as a security precaution. I always turn off auto-open, auto-run, thumbnailer. If I plug in a flash drive with automount off it is not present if I attempt to access it in a terminal. However, if I click on it in the file browser it does wake up and mount.

Thanks again,

Ken

You might want to try using autofs instead of the gnome/mate automounter, it is more configurable (using the /etc/auto.* files).