Bug 1642031

Summary: major: rpm does not give out dependencies when asked
Product: [Fedora] Fedora Reporter: customercare
Component: rpmAssignee: Packaging Maintenance Team <packaging-team-maint>
Status: CLOSED NOTABUG QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: high Docs Contact:
Priority: unspecified    
Version: 27CC: igor.raits, mjw, packaging-team-maint, pmatilai, pmoravco, vmukhame
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Target Release: ---   
Hardware: x86_64   
OS: Linux   
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Clone Of: Environment:
Last Closed: 2018-11-19 10:47:54 UTC Type: Bug
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description customercare 2018-10-23 12:28:33 UTC 
Description of problem:

Investigating if libssh is installed, i found (once again) that rpm does not fully understand it's own dependency tree.

the result is, that when asked if any package requires libssh, the answere is "none", but dnf finds > 1 packages
that need libssh. In my example below, we have sub-sub-sub-dependencies involved, thats why we end up at 39 packages removed.

It's unclear which package really depends on libssh, but i guess thats a dnf problem. 

Conclusion: "rpm -q --whatrequires" is buggy.  This can lead to accidently deleted packages, if a "dnf -y erase ..." is used on a package, when rpm ... return "" as a result.

(and i so voted for rpm being the better system compared to dkpg :( )

Version-Release number of selected component (if applicable):

rpm-4.14.2-1.fc27.x86_64

Working:

[root@eve marius]# rpm -q --whatrequires kodi
kodi-pvr-addons-common-14.0-0.2.20150125gita0a437e.fc21.noarch
kodi-pvr-iptvsimple-2.4.14-1.fc27.x86_64
kodi-pvr-vdr-vnsi-2.6.25-1.fc27.x86_64

not working:

[root@eve marius]# rpm -q --whatrequires libssh
Kein Paket benötigt libssh
[root@eve marius]# 

Proof that is wrong: 

[root@eve ~]$ dnf erase libssh
Abhängigkeiten sind aufgelöst.
========================================================================================================================
 Paket                                    Arch     Version                              Paketquelle               Größe
========================================================================================================================
Entfernen:
 libssh                                   x86_64   0.7.6-1.fc27                         @updates                  513 k
Removing dependent packages:
 gnome-boxes                              x86_64   3.26.4-1.fc27                        @updates                  5.3 M
 kodi                                     x86_64   17.6-1.fc27                          @rpmfusion-free            53 M
 kodi-pvr-addons-common                   noarch   14.0-0.2.20150125gita0a437e.fc21     @System                    37 k
 kodi-pvr-iptvsimple                      x86_64   1:2.4.14-1.fc27                      @rpmfusion-free-updates   407 k
 kodi-pvr-vdr-vnsi                        x86_64   1:2.6.25-1.fc27                      @rpmfusion-free-updates   761 k
 libvirt-client                           x86_64   3.7.0-6.fc27                         @updates                  806 k
 libvirt-daemon                           x86_64   3.7.0-6.fc27                         @updates                  2.8 M
 libvirt-daemon-config-network            x86_64   3.7.0-6.fc27                         @updates                  228  
 libvirt-daemon-driver-interface          x86_64   3.7.0-6.fc27                         @updates                  113 k
 libvirt-daemon-driver-network            x86_64   3.7.0-6.fc27                         @updates                  564 k
 libvirt-daemon-driver-nodedev            x86_64   3.7.0-6.fc27                         @updates                  117 k
 libvirt-daemon-driver-nwfilter           x86_64   3.7.0-6.fc27                         @updates                  170 k
 libvirt-daemon-driver-qemu               x86_64   3.7.0-6.fc27                         @updates                  1.5 M
 libvirt-daemon-driver-secret             x86_64   3.7.0-6.fc27                         @updates                   85 k
 libvirt-daemon-driver-storage            x86_64   3.7.0-6.fc27                         @updates                    0  
 libvirt-daemon-driver-storage-core       x86_64   3.7.0-6.fc27                         @updates                  616 k
 libvirt-daemon-driver-storage-disk       x86_64   3.7.0-6.fc27                         @updates                   23 k
 libvirt-daemon-driver-storage-gluster    x86_64   3.7.0-6.fc27                         @updates                   23 k
 libvirt-daemon-driver-storage-iscsi      x86_64   3.7.0-6.fc27                         @updates                   15 k
 libvirt-daemon-driver-storage-logical    x86_64   3.7.0-6.fc27                         @updates                   23 k
 libvirt-daemon-driver-storage-mpath      x86_64   3.7.0-6.fc27                         @updates                   11 k
 libvirt-daemon-driver-storage-rbd        x86_64   3.7.0-6.fc27                         @updates                   31 k
 libvirt-daemon-driver-storage-scsi       x86_64   3.7.0-6.fc27                         @updates                   15 k
 libvirt-daemon-driver-storage-sheepdog   x86_64   3.7.0-6.fc27                         @updates                   15 k
 libvirt-daemon-driver-storage-zfs        x86_64   3.7.0-6.fc27                         @updates                   15 k
 libvirt-daemon-kvm                       x86_64   3.7.0-6.fc27                         @updates                    0  
 libvirt-glib                             x86_64   1.0.0-2.fc26                         @fedora                   257 k
 libvirt-gobject                          x86_64   1.0.0-2.fc26                         @fedora                   216 k
 libvirt-libs                             x86_64   3.7.0-6.fc27                         @updates                   22 M
 python2-pillow                           x86_64   4.3.0-1.fc27                         @fedora                   2.0 M
 wireshark                                x86_64   1:2.6.2-1.fc27                       @updates                    0  
 wireshark-cli                            x86_64   1:2.6.2-1.fc27                       @updates                   89 M
 wireshark-gtk                            x86_64   1:2.6.2-1.fc27                       @updates                  2.2 M
 wireshark-qt                             x86_64   1:2.6.2-1.fc27                       @updates                  7.4 M
Entferne ungültige Abhängigkeiten:
 libmaxminddb                             x86_64   1.2.0-4.fc27                         @fedora                    34 k
 python2-olefile                          noarch   0.45.1-1.fc27                        @updates                  3.6 M
 systemd-container                        x86_64   234-11.git5f8984e.fc27               @updates                  959 k
 zfs-fuse                                 x86_64   0.7.2.2-6.fc27                       @fedora                   5.9 M

Transaktionsübersicht
========================================================================================================================
Entfernen  39 Pakete

Freigegebener Speicherplatz: 201 M
Ist dies in Ordnung? [j/N]:n
Comment 1 Igor Raits 2018-10-23 12:31:33 UTC 
Well, this is by design. Technically no packages require libssh, however there are packages requiring `libssh.so.4()(64bit)`.

You probably should use `dnf repoquery --whatrequires --installed libssh`.
Comment 2 Panu Matilainen 2018-11-19 10:47:54 UTC 
Like Igor said, this is by design. --whatrequires queries the literal capability passed as argument. From the man-page:

> --whatrequires CAPABILITY
>     Query all packages that require CAPABILITY for proper functioning.

For now, dnf repoquery is the friendlier tool for the purpose.