On Wed, Dec 29, 2021 at 3:03 PM Ben Cotton <bcotton@xxxxxxxxxx> wrote: > > https://fedoraproject.org/wiki/Changes/RelocateRPMToUsr > > == Summary == > Currently, the RPM databases is located in `/var`. Let's move it to > `/usr`. The move is already under way in rpm-ostree-based > installations, and in (open)SUSE. How does this work on RO /usr files systems? I thought data in /usr was supposed to be static/ It works for rpm-ostree because it's updated at tree creation time. > == Owner == > * Name: [[User:chrismurphy| Chris Murphy]], [[User:Salimma|Michel > Alexandre Salim]], [[User:Ngompa|Neal Gompa]] > * Email: bugzilla@xxxxxxxxxxxxxxxxx, michel@xxxxxxxxxxxxxxx, ngompa13@xxxxxxxxx > > > == Detailed Description == > === Current location === > <pre>/var/lib/rpm</pre> > > === New location === > <pre>/usr/lib/sysimage/rpm</pre> > > <code>/var/lib/rpm</code> will be a symlink pointing to > <code>/usr/lib/sysimage/rpm</code> > > Changing the file system layout to accommodate a snapshot+rollback > regime is implied, but not required by this proposal. For example, > Fedora has long placed `/home` on a separate subvolume (or file > system) so it can be isolated from system root. Likewise, it makes > sense to isolate `/var/log` and possibly `/var/lib/libvirt/images` so > these locations continue to carry forward in time, even if the system > root does a rollback. > > == Feedback == > > There will be no change to DNF as part of this change proposal. DNF's > history will remain in `/var` until DNF 5. Discussion continues about > the effect of a snapshot+rollback regime on DNF history. > [http://lists.rpm.org/pipermail/rpm-ecosystem/2021-December/000769.html > Relocate DNF history to /usr.] > > Upstream RPM accept the change, but institutionally don't like the > loss or weakening of a > [http://lists.rpm.org/pipermail/rpm-ecosystem/2021-December/000781.html > very well known location] for the database, and > [http://lists.rpm.org/pipermail/rpm-ecosystem/2021-December/000781.html > anticipate complaints]. > > > == Benefit to Fedora == > > * The RPM database primarily describes the state of `/usr`. Storing > the databases in `/usr` will more easily facilitate OS rollback, > without affecting `/var`. > > * Helps align Fedora variants with each other > ** rpm-ostree based systems (including CoreOS, IoT, Silverblue, > Kinoite) already use `/usr/lib/sysimage` for rpmdb. > > * Consistency with another RPM-based distro, (open)SUSE has made this change > > * Accounts for various snapshot+rollback regimes, i.e. it's a > beneficial change whether Btrfs or device-mapper based regimes. > > > == Scope == > * Proposal owners: > ** changes in rpm package > *** create the new path > *** create a symlink for the old path pointing to new path > > * Other developers: > ** changes in SElinux policy > > * Release engineering: [https://pagure.io/releng/issue/10441 #Releng > issue 10441] > * Policies and guidelines: N/A (not needed for this Change) > * Trademark approval: N/A (not needed for this Change) > * Alignment with Objectives: > > == Upgrade/compatibility impact == > Change will be applied to offline upgrades, similar to the RPM sqlite > database change. A systemd service will move the rpmdb from /var to > /usr, then create a symlink pointing to /usr from /var. > > # Create `/usr/lib/sysimage/rpm` (rpm package will do this at preinst) > # Create symlinks in `/usr/lib/sysimage/rpm/` pointing to files in > `/var/lib/rpm/` (rpm package will do this at preinst) > # Change the dbpath in `/usr/lib/rpm/macros` to > `/usr/lib/sysimage/rpm` (rpm package will be patched to do this on > F36+) > # Request rpm rebuild the database (done via systemd service) > # Remove `/var/lib/rpm` and create a symlink `/var/lib/rpm` -> > `/usr/lib/sysimage/rpm` (done via systemd service) > > > == How To Test == > > # Perform a new clean install, or upgrade a system > # Check that `/var/lib/rpm` is a symlink to `/usr/lib/sysimage/rpm` > # Check that `/usr/lib/sysimage/rpm` is populated with at least > `rpmdb.sqlite`, possibly also `rpmdb.sqlite-shm` and > `rpmdb.sqlite-wal` > # Confirm `rpm -q <package>` and/or `rpm -qa` still work > > == User Experience == > > * symlink `/var/lib/rpm` -> `/usr/lib/sysimage/rpm` > > Otherwise, the change should be invisible to users. > > == Dependencies == > * `rpm-ostree` probably should make `/usr/share/rpm` a symlink to > `/usr/lib/sysimage/rpm`, rather than the reverse as it is currently. > * `PackageKit` might use inotify on `/var/lib/rpm` need to check if it > does and whether it should be changed or add the additional path > > > == Contingency Plan == > * Contingency mechanism: Revert the change, try again the next Fedora release. > * Contingency deadline: Beta freeze > * Blocks release? Yes > > -- > Ben Cotton > He / Him / His > Fedora Program Manager > Red Hat > TZ=America/Indiana/Indianapolis > _______________________________________________ > devel mailing list -- devel@xxxxxxxxxxxxxxxxxxxxxxx > To unsubscribe send an email to devel-leave@xxxxxxxxxxxxxxxxxxxxxxx > Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ > List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines > List Archives: https://lists.fedoraproject.org/archives/list/devel@xxxxxxxxxxxxxxxxxxxxxxx > Do not reply to spam on the list, report it: https://pagure.io/fedora-infrastructure _______________________________________________ devel mailing list -- devel@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to devel-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/devel@xxxxxxxxxxxxxxxxxxxxxxx Do not reply to spam on the list, report it: https://pagure.io/fedora-infrastructure
