Revert a modified file in /volumio

Help and Support Help
1

Hi

Could somebody please review the following commands for potential problems. They revert a modified file in /volumio, and are based on commands from volumio updater restorevolumio, but resync the filesystem by remounting the root volume. They are intended to be run on a working system without requiring a reboot, and I have been using them while Volumio is running without noticing problems.

# create a temporary directory
tmp_dir=$(mktemp -d -t mpd_oled-XXXXXXXXXX)

# mount the upper filesystem
mount /dev/mmcblk0p3 "$tmp_dir"

# remove the changed mpd.conf template file (should warn if not present)
rm "$tmp_dir/dyn/volumio/app/plugins/music_service/mpd/mpd.conf.tmpl"

# tidy up
umount "$tmp_dir"
rmdir "$tmp_dir"

# syncronise and put the file system back in good order
sync
mount -o remount /

Thanks

Adrian.

2

You are deleting a file from the overlay filesystem dynamic folder, which is not supposed to be accessed directly!
I strongly advise not to do this.

3

Hi gkkpch

Thanks for commenting on the script. I haven’t received any reports of issues relating to the script, but I share your concern about the potential for issues.

A similar technique is used by Volumio. It restores the whole volumio directory by deleting a it from the overlay filesystem dynamic folder (the code is in /volumio/update-helper.js).

You can see the same technique, using remount, being recommended here

Adrian.

4

I’m aware of the fact that you can, still not recommending it and that is basically what you were asking for: our opinion.
But of course, nothing is stopping you from doing it.
As long as you know what and why you are deleting from a dyn folder you are probably safe.