My email client, Thunderbird, required me, when setting it up, to give
the path to my "local directory". I did so. That path, which led to
files on my USB hard drive, began as follows: "/media/usbdisk1/...".
When I look at my "/etc/fstab" file, it shows that "/media/usbdisk1" is
the mount point for "/dev/sda1".
The "/etc/fstab" file also has a line in it relating to "dev/sdb1",
whose mount point is given as "/media/usbdisk". sdb1 is a USB flash
drive.
Recently, I booted up with sdb1 being, by mistake, not plugged in.
Then, when I started Thunderbird, it was unable to find my "local
directory". I discovered that that was because the path to my "local
directory" that I'd given it earlier, beginning with "/media/usbdisk1",
couldn't be found, the mount point for sda1 having been changed
automatically to "/media/usbdisk" when sdb1 wasn't present on bootup.
After that experience, I posted a question about it to this list.
However, I don't believe that I explained in my post about the path in
Thunderbird.
In any event, it was suggested to me that I could create a udev rule to
solve my problem.
I've read what I could find on creating udev rules, but still remain
confused, hence this further posting.
I understand that I can identify my USB hard drive in a udev rule as
follows:
BUS="usb", SYSFS{serial}="503110007286" (that serial number having been
got by using udevinfo).
Next come(s) the assignment key(s).
One article I read suggested using NAME="%k" and then specifying any
"extra names in the SYMLINK parameter so that you do not lose the
default sensible names".
However, I don't understand presently how doing that would solve my
problem. My problem, as I dimly understand it, is the path to my "local
directory" in Thunderbird, which begins with "/media/usbdisk1". If, in
a udev rule, I created a SYMLINK called "/media/usbdisk1", it seems
that that would add to my "/dev" directory an entry
"/dev/media/usbdisk1". But would that mean that Thunderbird would find
my "local directory" even when sdb1 was unplugged?
Alternatively, I understand that I could not bother with a SYMLINK and
merely assign a NAME value of "media/usbdisk1" to sda1, which would
also create an entry in the "/dev" directory called "/dev/usbdisk1".
But again I don't understand how sda1's having that NAME value would
solve my path problem in Thunderbird if sdb1 was unplugged on bootup.
I suppose I could reframe my fundamental question as this: don't I need
a permanent mount point, rather than a permanemt device name?
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