You should be using the UUID of the partition to detect and mount your target. Detecting the "whole" drive is immaterial, since you want udev to mount a partition, not a drive.

I would try to get one partition working first, then proceed to the others. With udev testing, I've always had far more luck testing individual tasks, one by one. Throw too much stuff at it, and you can't tell what's not working: udev, your script, or you.

On Thu, Jul 4, 2019 at 3:26 AM Angelo Moreschini <mrangelo.fedora@gmail.com> wrote:
HI Seth,

I'm sorry to still bother you ..., but your help could save me a lot of useless tests (since there are many parameters to manage and knowing what I really have to do could, this trigger me the use of useless ones).


I think that I understood the crux of the problem ... (the UDEV theory …) but I still have a doubt that comes from the division of my HD into partitions (to how this particularity can influence my particular problem).

I would like exactly to know if UDEV reveals the existence of the entire HD USB, or if instead it detects only the individual existence of the three partitions that are mounted there ..


Because I read this.., I think that I could be able to  check the real “work” of UDEV  on my computer :

“Whenever you connect to the system, the kernel detects and initializes it, and directory with the device name is created under / sys / directory which stores the device attributes.”.

This could be a great help, but I couldn’t identify “this: sub-directory…., in the  /sys directory, they are there many directories with many ramifications ,   how I can to identify the one in which they are stored the attributes of the device whose presence is detected by UDEV?


Knowing if UDEV only reveals the existence of the (three) partitions and not the existence of the entire HD also has reflections on the script script that uses rsynk to carry out the bak-up.

This is because (probably) I should write three scripts that use the utility rsync (one script for each partition) and not a single script that acts on the three different partitions.


Thank you

regards


Angelo



On Wed, Jul 3, 2019 at 12:40 AM Fred Smith <fredex@fcshome.stoneham.ma.us> wrote:
On Wed, Jul 03, 2019 at 07:16:17AM +1200, Seth Kenlon wrote:
> Using the UUID is correct.
>
> If the script isn't being executed by udev but you can confirm that
> udev is correctl mounting your target partition, and the shell script
> functions as expected when you run it manually, then I would create a
> simple timestamp shell script just to confirm that you can get a shell
> script to do *something* due to a udev event. The more complex the
> shell script, the more variables you have to debug, so simplify your
> shell script and work to just get a time stamp (or something) when a
> udev event occurs.

I've done that by embedding echo commands into the script that
will put debugging statements  a debug file that you can look
at after bootup.

put one statement before anything else in the script and if you
don't get any debugoutput you'll know the script isn't being run.

Fred
>
> On Tue, Jul 2, 2019 at 3:07 AM Angelo Moreschini
> <mrangelo.fedora@gmail.com> wrote:
> >
> > thank you Seth,
> >
> > I have no problems with the script executed at the UDEV event (if this is the meaning you attribute to the term <UDEV script>).
> > I've already done this script that works, if run from a terminal.
> > If by the term <UDEV script> you mean something different, please tell me.
> >
> >
> > The problem is that this script is not executed as a result of the UDEV event.
> > - - - - - -
> > But maybe there is still something not clear for me that I can ask you:
> > The HD (USB) that I am using,  is divided into three partitions (in order to keep the saved data separate):
> > = - = - = - = - = - =
> > the blkid command give  this output ...:
> > / dev / sdc1: LABEL = "PRTZm_sys-admin" UUID = "1A5CEE7149E4BA81" TYPE = "ntfs" PARTUUID = "0007fd62-01"
> > / dev / sdc2: LABEL = "PRTZm_data-common" UUID = "7FB1E3D91206DE1C" TYPE = "ntfs" PARTUUID = "0007fd62-02"
> > / dev / sdc3: LABEL = "PRTZm_programming" UUID = "0A69FDE9688969D9" TYPE = "ntfs" PARTUUID = "0007fd62-03"
> > = - = - = - = - = - =
> > so far, till now, I tried to reveal the montage of the HD without taking into the account of partitions into which the USB HD  is divided ..
> > But since the blkid command does not reveal its own UUID I am now thinking that this could be the problem.
> >
> > IN CONCLUSION, since the USB is divided into partitions, ... will the UDEV event reveal the presence of the entire HD (as the sole unit), or will it instead reveal the presence of the three individual different partitions?
> >
> > Still I would ask .... : this is a good syntax  ?    ENV{ID_FS_UUID}=="1A5CEE7149E4BA81"
> > and still also,   :-) ....
> > what I have to use the UUID number, or instead the PARTUUID number ?
> >
> > thank you very much
> > Angelo
> >
> > On Mon, Jul 1, 2019 at 2:00 PM Seth Kenlon <skenlon@redhat.com> wrote:
> >>
> >> Angelo,
> >> I agree with Tom's analysis, but my udev script accounts for it by
> >> mounting your drive with a very specific designator.
> >>
> >> Here is how I have tested this sort of thing before:
> >>
> >> 0. Get the UUID of your drive with blkid
> >> 1. Write a udev script to detect your drive by UUID when attached, and
> >> to execute a test shell script (such as /usr/local/bin/angelo-test.sh)
> >> when the drive is attached
> >> 2. Create the script /usr/local/bin/angelo-test.sh to do something
> >> very simle, like echo `date` >> /tmp/backup.log, and make it
> >> executable
> >> 3. Reboot
> >> 4. Attach your drive, and then look for the execution of your test
> >> script. If there was a /tmp/backup.log created with the correct date
> >> and time in it.
> >> 5. Look in /media to ensure that your drive has been mounted as a
> >> unique and persistent entitiy.
> >>
> >> If it worked, then change the script to your real backup script.
> >> Continue to test.
> >>
> >> If it failed, review your udev script, use `udevadm monitor` to
> >> discover why your drive isn't triggering your script.
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--
---- Fred Smith -- fredex@fcshome.stoneham.ma.us -----------------------------
  "For him who is able to keep you from falling and to present you before his
 glorious presence without fault and with great joy--to the only God our Savior
 be glory, majesty, power and authority, through Jesus Christ our Lord, before
                     all ages, now and forevermore! Amen."
----------------------------- Jude 1:24,25 (niv) -----------------------------
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