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G.W.
Asked: 2021-01-30 16:45:59 +0800 CST

How do I find and use `--object-path` with `udisksctl`?

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I don't understand the --object-path option in the udisksctl command

I want to unmount an USB thumb drive, but I don't want to have to lookup it's device name (for example /dev/sdb) at each mount. The device name can change across mounts. I want a static way to identify the drive, for example by its partition name or UUID. Does the --object-path service this function?

How do I identify what the --object-path is of a USB thumb drive so I can execute a command such as the following with a partition name that is static across mountings: udisksctl unmount --object-path /media/greg/FD-ext4

unmount

1 Answers

  1. I was looking for the answer to the same question, but there isn't a clear answer because the object seems to be the internal D-Bus object that is created by udisksd (see: https://askubuntu.com/a/633045/49873). This is even more annoying when you have multiple disks mounted and you want to unmount one of them.

    My workaround to this is to continue to use the --block-device (or -b) option, but by disk label, e.g. my external backup drive has the label xbackup, so I can mount it as:

    $ udisksctl mount -b /dev/disk/by-label/xbackup

    Note that this can be confusing if you have multiple drives with the same label. I believe in that scenario the first drive attached to the system retains the label as is, and subsequent devices get a numeric suffix, like xbackup1 (unverified, trying to recall from memory).

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