Julius Adorf <jeadorf@xxxxxxxxxxxxxx> writes:
> Hello,
>
> Recently, I tried to automatically unlock an encrypted external USB
> hard drive on Arch Linux. I have done this by inserting an appropriate
> entry into /etc/crypttab. I chose the device to be unlocked by
> cryptsetup with a key file by UUID.
>
> Unfortunately, the unlocking failed at boot time ("device does not
> exist or access denied"). After some debugging via /etc/rc.sysinit, I
> found out that it is a timing issue and the USB drive which is a
> couple of years old was not ready yet at the time the /etc/crypttab
> was read and processed. A similar issue has been reported here:
> https://bbs.archlinux.org/viewtopic.php?id=137467
>
> For now, I have inserted a workaround into /etc/rc.local which unlocks
> the disk after an initial delay. This is still programming by
> coincidence; I wonder whether there is any better (i.e. reliable)
> solution to this problem?
I think systemd auto mount facility may be able to handle it.
But you're probably won't want to use systemd only for this.
--
Carl Lei (XeCycle)
Department of Physics, Shanghai Jiao Tong University
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