Mon, Dec 26, 2022 at 01:34:48AM +0100, Udo Richter wrote:
No, just replace the call to vdr in the service with a call to a runvdr
script (any of the ones floating around, or just a three-liner), and in
that script, after vdr ends, do whatever cleanup you need to do.
I see. That could certainly work.
I could execute "udisksctl unmount -f /dev/disk/by-label/VDR" to have
the file system lazily unmounted as soon as all files are closed. But
there is no such lazy option for power-off, and power-off itself will
not unmount the file system.
Because I store the VDR configuration outside of this file system, it
should be safe to attempt to unmount the video directory while VDR is
running:
#!/bin/sh
set -e
if [ "$5" = 1 ]
then
sudo udisksctl unmount -b /dev/disk/by-label/VDR
sudo udisksctl power-off -b /dev/disk/by-label/VDR
sudo service vdr stop
fi
I tested that the above script works when I press the Power button while
watching live TV. If I am watching a recording that resides on this file
system, the first command will fail, and thanks to "set -e", the rest of
the script (in particular, shutting down the VDR service) will be
skipped, that is, VDR will keep running.
In addition to having this script, I might configure some more, such as:
* Write some udev rule so that when the USB storage is unplugged and
replugged, the file system will be auto-mounted and VDR service will be
started.
* Restore /etc/systemd/logind.conf to HandlePowerKey=poweroff so that
the system can be easily shut down by pressing the Power button again.
That would make it easy to do things like moving the disk to another
computer for backing up or managing recordings. (Yes, I would rather use
the native speed of the drive via USB 3, rather than have it throttled
by 100 Mb/s Ethernet or the single USB 2.0 bus of the Raspberry Pi 2.)
In fact, this type of setup would also allow easy swapping of USB drives
(one at a time) for making or watching recordings, a little like it was
in the VCR times. The downtime for swapping drives would be a few
seconds. The VDR configuration would be stored in the root file system,
outside these detachable drives. The user interface to the entire setup
would remain "living room compliant": remote control, display, and the
USB cable of the drive.
The system could keep powering other tasks (such as home automation)
while no storage is attached. If I didn't care about downtime, I might
also use the following crude script to simply shut down the entire
system:
#!/bin/sh
if [ "$5" = 1 ]
then
sudo shutdown -h now
fi
In either case, the user would be responsible for starting VDR in time
for the next scheduled recording.
Marko
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