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Sqerstet
Asked: 2015-12-13 15:02:43 +0800 CST

Run script when an always-connected drive is mounted

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How can I trigger a script to be run when an always connected drive is mounted?

I have tried udev, specifically placing a rule 99-local.rules in /etc/udev/rules.d:

KERNEL=="mmcblk0",ACTION=="mount",RUN+="/path/to/script.sh"

And reloading the rules. But the script does not run when the drive is mounted.

Note that the drive is an SD card, hence the mmcblk0 block device name. It is not a USB drive and is not being hotplugged.

mount

1 Answers

  1. Best Answer

    Turns out that this is not easy to accomplish with udev. With udevadm monitor -p I verified that, when mounted, my SD card fires no ACTION=="mount" event in udev. I read somewhere that the mount event has been deprecated or removed, which if true would explain it. udev, after all, is supposed to manage hotplugging.

    In addition, udev-triggered scripts must complete very quickly because they block udev while running. Not ideal for a substantial task, for example backup.

    I achieved my aim by writing a systemd service file in /etc/systemd/system/ using ExecStart for .mount:

    [Unit]
Description=Script to run when drive mounted at /path/to/Stuff
Requires=path-to-Stuff.mount
After=path-to-Stuff.mount

[Service]
ExecStart=/path/to/script.sh
Type=forking

[Install]
WantedBy=path-to-Stuff.mount

    Works correctly, though it does require specifying the mount point.

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