I need to keep one system as much intact as possible. Only soldering of HW stuff is allowed :-). I need to install a test software package and this package must not stay there in the future.
I have a following situation:
- mmcblck partition mounted as /, ext4, read only, kernel v4.6.0
- usb stick (only one partition), mounted to /tmp/usbstick, ext4
- Created directories on usbstick /tmp/usbstick/upperdir, /tmp/usbstick/workdir
- Using the following line: mount -t overlay overlay -o lowerdir=/,upperdir=/tmp/usbstick/upperdir,workdir=/tmp/usbstick/workdir /
After that the / is still read only. The only partial success I had was when I created /tmp/usbstick/merged and gave it as a "merged" directory, instead of / to the module. Then I saw all my rootfs in that directory and it was rw mounted, but I can't use it there. What should I do?