[Bug 1074418] Re: qemu:///sessions fail, when libvirtd hasn't been started properly before

Sebastien Bacher seb128 at ubuntu.com
Wed Nov 28 14:17:56 UTC 2012


Thank you for your bug report, the issue should be fixed with 1.0 in
raring, the commit fixing it seems to be
http://libvirt.org/git/?p=libvirt.git;a=patch;h=efe6c8021146d046846ead5b5efc9828d97c1ceb
... I'm looking at backporting it to quantal

** Changed in: libvirt (Ubuntu)
       Status: Confirmed => Fix Released

** Changed in: libvirt (Ubuntu)
   Importance: Undecided => High

** Changed in: libvirt (Ubuntu Quantal)
   Importance: Undecided => High

** Changed in: libvirt (Ubuntu Quantal)
       Status: New => In Progress

** Description changed:

+ Impact:
+ clients using qemu:///session fail to contact the server, that makes e.g gnome-boxes fail to work correctly
+ 
+ Test case:
+ - run "virsh -c qemu:///session"
+ 
+ it hits this in quantal "error: failed to connect to the hypervisor",
+ with the fix it should work
+ 
+ Regression potential:
+ Limited, that commit is only setting some extra environment variables
+ 
+ -----
+ 
  Starting with 12.10 the libvirt communications mechanism uses the
  "XDG_RUNTIME_DIR" environment variable to determine the directory to put
  in its pipe(s) and controlling files - this normally being
  "/run/user/$USER/libvirt".
  
  Now when you run a qemu user(!) session (qemu:///session) and a
  'libvirtd'-process owned by the user hasn't already be spawned - e.g.
  manually - libvirt0 will spawn one itself. When manually spawned from a
  terminal window, "XDG_RUNTIME_DIR" is properly set up to
  "/run/user/$USER" and everything works well with libvirtd. When libvirt0
  spawns the libvirtd, it will use $HOME/.cache/libvirt, the previous (up
  to and including 12.04) location for this, because this seems to be its
  fallback-default.
  
  Thus when you start such a session with "virsh -c qemu:///session" or
  vitual-manager, respectively, it will fail, saying
  
  error: Failed to connect socket to '/run/user/$USER/libvirt/libvirt-sock': No such file or directory
  error: failed to connect to the hypervisor
  
  in the former case.
  
  Either "XDG_RUNTIME_DIR" is not properly set when libvirt spawns
  libvirtd, or it is not respected. My assumption is the former, as
  "XDG_RUNTIME_DIR" seems to be set by some 'pam'-module, that probably
  isn't used when libvirt exececutes libvirtd.
  
  As a workaround one can set "XDG_RUNTIME_DIR=.cache" in the environment
  calling "virsh" or "virtual-manager", the everything uses the old/former
  settings and works.
  
  The problem seems to be to tell libvirt about the proper
  "XDG_RUNTIME_DIR" contents or make it the new default.
  
  The way it is now, qemu-user-sessions will just fail when started by
  virsh or virt-manager.
  
  By the way, you can test it even with a 'live'-system (USB/DVD) by just
  adding the libvirt-bin and/or virt-manager packages, thus it is not
  dependent on the version of the packages installed on the actual system.
  
  Nevertheless as I can't see if that information is attached otherwise, here are the system data you require:
  Description:	Ubuntu 12.10
  Release:	12.10
  libvirt0:
    Installed: 0.9.13-0ubuntu12
    Candidate: 0.9.13-0ubuntu12
    Version table:
   *** 0.9.13-0ubuntu12 0
          500 http://de.archive.ubuntu.com/ubuntu/ quantal/main i386 Packages
          100 /var/lib/dpkg/status
  
  Best regards.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 12.10
  Package: libvirt0 0.9.13-0ubuntu12
  ProcVersionSignature: Ubuntu 3.5.0-17.28-generic 3.5.5
  Uname: Linux 3.5.0-17-generic i686
  NonfreeKernelModules: nvidia
  ApportVersion: 2.6.1-0ubuntu6
  Architecture: i386
  Date: Fri Nov  2 17:13:51 2012
  InstallationDate: Installed on 2011-03-05 (608 days ago)
  InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007.1)
  MarkForUpload: True
  SourcePackage: libvirt
  UpgradeStatus: Upgraded to quantal on 2012-10-26 (6 days ago)

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https://bugs.launchpad.net/bugs/1074418

Title:
  qemu:///sessions fail, when libvirtd hasn't been started properly
  before

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