Public bug reported:
In older versions (10.04 and older) we use HAL and UDEV rules to force
all USB drives to be automounted read-only by the Desktop Environment.
But they don't anymore for the newer versions. After a few days
research and expirementations, I'm now able accomplish it using the UDEV
rule:
KERNEL=="sd[b-z][0-9]", RUN+="/sbin/blockdev --setro /dev/%k"
In 16.04 and 17.10, the above work for FAT/exFAT, ext3/4, and even ext4
on an encrypted partition. It doesn't work though on NTFS-formatted usb
drives -- I get a permission denied error.
To replicate/test this without creating the UDEV rule:
1. Insert FAT or ext3/4-formatted flash drive. Let Nautilus automount it.
Note where in the left navigation pane it is.
2. From a terminal session, unmount the partition -- let's say sdb1.
3. Do: sudo blockdev --setro /dev/sdb1
4. In Nautilus' left pane, click on the device name to mount it again.
5. The mount command should show the mounted device as read-only.
Do the same for a NTFS-formated usb drive. By step #4, it will not
mount with a permission denied error.
** Affects: udisks (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1734280
Title:
udisks unable to mount NTFS-formatted usb drive properly if block
device is set to read only (blockdev --setro /dev/sd??)
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