On 17/03/2021 22:22, Patrick O'Callaghan wrote:
On Mon, 2021-03-15 at 10:40 +0800, Ed Greshko wrote:
On 15/03/2021 07:37, Patrick O'Callaghan wrote:
The only remaining problem (touch wood) is to get the power-down
script
to run after a timeout. I'll consider writing a special script to
monitor the mount status independently of systemd.
You can consider using the timer/service pair of systemd.
Add another Wants to raid.mount of say "raid.timer". Then....
1. Upon mount, raid.timer is started.
2. After defined time, raid.timer calls "raid.service".
3. raid.service checks mount status.
4. If still mounted then exit. Meaning goes back to waiting and #2.
5. If now unmounted, power off the hub and stop raid.timer. So,
basically, raid.service no long runs
and you're back to condition #1 which starts the timer again on
the next mount.
OK, I'm attempting to do that, but it's not quite there. The main
problem seems to be getting the timer to fire more than once (did I
mention how obscure the systemd docs are?). As it stands, the
raid.service unit checks the mounted status immediately rather than
waiting, and of course it always succeeds, but then just finishes.
I attach the current systemd files. The 'dock' script is now
considerably simplified (it turns out that all the bus scanning is
unnecessary as I can just use ' hdparm -y' to spin down, and spinning
up is automatic). The 'cdown' argument powers down the dock
conditionally, i.e. if it's not mounted.
I'll have a look at this on my tomorrow....
--
People who believe they don't make mistakes have already made one.
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