overlayroot 0.27ubuntu1.3 to 0.27ubuntu1.5 change behavior

[ben adler]

I usually use overlayroot 0.27ubuntu1.3 with the following configuration in overlayroot.conf:

overlayroot_cfgdisk="disabled"
overlayroot="tmpfs:recurse=0"

That means my real root filesystem in /dev/sda2 is now mounted to /media/root-ro, and to make changes, I can issue

mount -o remount,rw /media/root-ro/

to have /media/root-ro mounted read-write and can make changes to the root filesystem.

With 0.27ubuntu1.5, this changed, because

mount -o remount,rw /media/root-ro/

does not work any longer (although it returns 0). I have to use

mount -o remount,rw /media/root-ro

(note the trailing slash has to go).

I verified this change by installing the different versions of overlayroot and comparing behavior.
This is a bug to me because I have a script deployed on many machines, which relies on this working. What can be done?

Thanks!

[Scott Moser (smoser)]

Hi,
I'm sorry about the unintended change in behavior.
Looking at the delta, I think it was unintended fallout of commenting out the '/' entry in /etc/fstab in an effort to work around LP: #1723183.

I don't think there is really much we can do about it.

really just an FYI, there is a 'overlayroot-chroot' command that will do the mount rw for you (and then un-do it).

[Scott Moser (smoser)]

Thanks for filing a bug. Had I seen this quite some time ago I might have done something differently.