Latest revision as of 16:22, 8 December 2021

Relocate RPM/DNF databases to /usr

Summary

Currently, the RPM and DNF databases are located in /var. Let's move them to /usr.

Owner

Name: Chris Murphy
Email: chrismurphy@fedoraproject.org
Name: Michel Alexandre Salim
Email: salimma@fedoraproject.org

Current status

Targeted release: Fedora Linux 36
Last updated: 2021-12-08
FESCo issue: <will be assigned by the Wrangler>
Tracker bug: <will be assigned by the Wrangler>
Release notes tracker: <will be assigned by the Wrangler>

Detailed Description

Current location

/var/lib/rpm 
/var/lib/dnf

New location

/usr/lib/sysimage/rpm 
/usr/lib/sysimage/dnf

Feedback

Benefit to Fedora

The RPM and DNF databases describe the state of (primarily) /usr. Storing these 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

Scope

Proposal owners:
- changes in rpm and dnf-data packages
  - create the new path instead of old
  - create symlinks for the old path to new path

Other developers:
- changes in SElinux policy

Release engineering: #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 on upgrades to Fedora 36.

How To Test

Clean install or upgrade an existing Fedora system
Note the changed database paths (new location) and symlinks in the old location
Check that rpm and dnf commands work as expected, e.g.

dnf history  
rpm -qa

User Experience

Users will notice:

symlinks in the old locations for the databases, pointing to the new locations;
paths existing in the new locations.

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

Documentation

Release Notes

@@ Line 3: / Line 3: @@
 == Summary ==
-Currently, the RPM and DNF databases are located in /var. Let's move them to /usr.
+Currently, the RPM and DNF databases are located in `/var`. Let's move them to `/usr`.
 == Owner ==
@@ Line 13: / Line 13: @@
 <!-- Include you email address that you can be reached should people want to contact you about helping with your change, status is requested, or technical issues need to be resolved. If the change proposal is owned by a SIG, please also add a primary contact person. -->
 * Email: chrismurphy@fedoraproject.org
+* Name: [[User:Salimma|Michel Alexandre Salim]]
+* Email: salimma@fedoraproject.org
 <!--- UNCOMMENT only for Changes with assigned Shepherd (by FESCo)
 * FESCo shepherd: [[User:FASAccountName| Shehperd name]] <email address>
@@ Line 26: / Line 28: @@
 <!-- Select proper category, default is Self Contained Change -->
-[[Category:SelfContainedChange]]
+<!-- [[Category:SelfContainedChange]] -->
-<!-- [[Category:SystemWideChange]] -->
+[[Category:SystemWideChange]]
 * Targeted release: [[Releases/36 | Fedora Linux 36 ]]
@@ Line 56: / Line 58: @@
 == Benefit to Fedora ==
-The RPM and DNF databases describe the state of (primarily) `/usr`. Storing these databases in `/usr` will more easily facilitate OS rollback, without affecting `/var`.
+* The RPM and DNF databases describe the state of (primarily) `/usr`. Storing these 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
 == Scope ==
 * Proposal owners:
+** changes in rpm and dnf-data packages
+*** create the new path instead of old
+*** create symlinks for the old path to new path
 <!-- What work do the feature owners have to accomplish to complete the feature in time for release?  Is it a large change affecting many parts of the distribution or is it a very isolated change? What are those changes?-->
 * Other developers: <!-- REQUIRED FOR SYSTEM WIDE CHANGES -->
 <!-- What work do other developers have to accomplish to complete the feature in time for release?  Is it a large change affecting many parts of the distribution or is it a very isolated change? What are those changes?-->
-** change in rpm and dnf-data packages
-*** create the new path instead of old
-*** create symlinks for the old path to new path
 ** changes in SElinux policy
@@ Line 77: / Line 83: @@
 <!-- If your Change may require trademark approval (for example, if it is a new Spin), file a ticket ( https://pagure.io/Fedora-Council/tickets/issues ) requesting trademark approval from the Fedora Council. This approval will be done via the Council's consensus-based process. -->
 * Alignment with Objectives:
-** Helps align Fedora variants with each other
-*** rpm-ostree based systems already use `/usr/lib/sysimage` for rpm.
 == Upgrade/compatibility impact ==
@@ Line 103: / Line 107: @@
 -->
 * Clean install or upgrade an existing Fedora system
-* Note the changes
+* Note the changed database paths (new location) and symlinks in the old location
+* Check that `rpm` and `dnf` commands work as expected, e.g.
+<pre>dnf history
+rpm -qa</pre>
 <!-- REQUIRED FOR SYSTEM WIDE CHANGES -->
 == User Experience ==
@@ Line 122: / Line 128: @@
 * symlinks in the old locations for the databases, pointing to the new locations;
 * paths existing in the new locations.
 Otherwise, the change should be invisible to users.
@@ Line 127: / Line 134: @@
 == Dependencies ==
 <!-- What other packages (RPMs) depend on this package?  Are there changes outside the developers' control on which completion of this change depends?  In other words, completion of another change owned by someone else and might cause you to not be able to finish on time or that you would need to coordinate?  Other upstream projects like the kernel (if this is not a kernel change)? -->
+* `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
 <!-- REQUIRED FOR SYSTEM WIDE CHANGES -->
 == Contingency Plan ==
 <!-- If you cannot complete your feature by the final development freeze, what is the backup plan?  This might be as simple as "Revert the shipped configuration".  Or it might not (e.g. rebuilding a number of dependent packages).  If you feature is not completed in time we want to assure others that other parts of Fedora will not be in jeopardy.  -->
-* Contingency mechanism: Revert the change <!-- REQUIRED FOR SYSTEM WIDE CHANGES -->
+* Contingency mechanism: Revert the change, try again the next Fedora release. <!-- REQUIRED FOR SYSTEM WIDE CHANGES -->
 <!-- When is the last time the contingency mechanism can be put in place?  This will typically be the beta freeze. -->
 * Contingency deadline: Beta freeze  <!-- REQUIRED FOR SYSTEM WIDE CHANGES -->
@@ Line 144: / Line 152: @@
 <!-- REQUIRED FOR SYSTEM WIDE CHANGES -->
-N/A (not a System Wide Change)
 == Release Notes ==

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