On Thu, 24 Mar 2022 11:13:02 +0100 Ansgar wrote: > | FATAL ERROR: > | Can't rename /bin: Invalid cross-device link
> I think we need to deal with this in some way. A possible solution > might also be to skip conversion in containers for now (as Docker > containers should probably not be upgraded from one Debian release to > a newer). OpenSUSE seems to have chosen this solution as well. Quoting from [1]: +--- | Upgrading layers of containers does not work (Bug 1187027). | This is due to overlayfs. There is no workaround. Please re-deploy | the base image instead. +---[ https://en.opensuse.org/openSUSE:Usr_merge#State_in_openSUSE ] The relevant change in their conversion program: +--- | 45 +if [ "$(stat -f -c %T "${ROOT:-/}")" = "overlayfs" ]; then | 46 + echo "UsrMerge conversion does not work on overlayfs" | 47 + exit 1 | 48 +fi +---[ https://build.opensuse.org/request/show/898435 ] For Debian, I think usrmerge.postinst should skip conversion in case overlayfs is used (without error, but possibly a warning message). With this bookworm containers should be usable, but an upgrade of containers[1] that still use the old filesystem layout from bookworm to trixie would not be supported / would require the admin to handle conversion to merged-/usr in some other way. Ansgar [1]: Or other environments that might use overlayfs.
