https://bugs.kde.org/show_bug.cgi?id=467751
Bug ID: 467751 Summary: Unmounting an SD card triggers a remount Classification: Frameworks and Libraries Product: frameworks-solid Version: 5.103.0 Platform: Other OS: Linux Status: REPORTED Severity: normal Priority: NOR Component: general Assignee: unassigned-b...@kde.org Reporter: be...@igalia.com CC: kdelibs-b...@kde.org, lu...@kde.org Target Milestone: --- SUMMARY Unmounting an SD card results in it being re-mounted again if "automount on attach is enabled". STEPS TO REPRODUCE 1. Enable "Automount all known devices on attach" on the desktop settings. 2. Insert an SD card in the reader (can be reproduced on a VM). The volume should be mounted automatically. 3. Click on "Safely remove" to unmount the volume. OBSERVED RESULT The volume is re-mounted again immediately. EXPECTED RESULT The volume remains unmounted. SOFTWARE/OS VERSIONS KDE Plasma Version: 5.27.2 KDE Frameworks Version: 5.103.0 Qt Version: 5.15.8 ADDITIONAL INFORMATION Hi, I'm unsure about whether this is an actual bug in KDE, UDisks, or not a bug at all, so let me explain the situation. SD card readers have the "MediaRemovable" flag set in UDisks: https://github.com/storaged-project/udisks/blob/2.9.x-branch/src/udiskslinuxdrive.c#L368 This, according to the UDisks documentation, seems to only mean that "the media can be removed from the drive". However, Solid uses that information to decide whether to _eject_ the volume when the user tries to "Safely remove" the volume from the desktop. The "Ejectable" flag from UDisks was previously used for this purpose but it was discarded because it was considered broken (bug #402096, commit https://github.com/KDE/solid/commit/6d260195cf75604d835235d2a1b02166ee8b514a). The UDisks Eject command runs /usr/bin/eject under the hood, but this won't actually eject the card from the reader, so it fails (I'm using a VM in this example but the same happens with real hardware): $ busctl call org.freedesktop.UDisks2 /org/freedesktop/UDisks2/drives/QEMU__0xdeadbeef org.freedesktop.UDisks2.Drive Eject 'a{sv}' 0 Call failed: Error ejecting /dev/mmcblk0: Command-line `eject '/dev/mmcblk0'' exited with non-zero exit status 1: eject: unable to eject This results in the following udev events: UDEV [9144.057110] remove /devices/pci0000:00/0000:00:04.0/mmc_host/mmc0/mmc0:4567/block/mmcblk0/mmcblk0p1 (block) UDEV [9144.105960] change /devices/pci0000:00/0000:00:04.0/mmc_host/mmc0/mmc0:4567/block/mmcblk0 (block) UDEV [9144.193215] add /devices/pci0000:00/0000:00:04.0/mmc_host/mmc0/mmc0:4567/block/mmcblk0/mmcblk0p1 (block) Because of these remove+add events, if "Automount all known devices on attach" is set under the removable devices settings and you try to safely remove an SD card then the volume is immediately re-mounted again. I also noticed that this does not happen in GNOME and this is due to a workaround there: if a volume appears much later than the drive (as in this case) then it is not mounted automatically: https://gitlab.gnome.org/GNOME/gvfs/-/commit/b4800b987b4a8423a52306c9aef35b3777464cc5 So while doing something like this would be a possibility, is it maybe possible to find a way to know whether the media in a certain drive is actually ejectable, and not simply removable? Otherwise it seems that Solid should not try to use eject based only on the "MediaRemovable" flag. Opinions? -- You are receiving this mail because: You are watching all bug changes.