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[Qemu-devel] [Bug 1396497] Re: 'qemu-img snapshot' allows new snapshot t


From: Serge Hallyn
Subject: [Qemu-devel] [Bug 1396497] Re: 'qemu-img snapshot' allows new snapshot to be created with the name of an existing snapshot
Date: Fri, 16 Jan 2015 22:08:27 -0000

** Changed in: qemu (Ubuntu)
   Importance: Undecided => Low

** Changed in: qemu (Ubuntu)
       Status: New => Triaged

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https://bugs.launchpad.net/bugs/1396497

Title:
  'qemu-img snapshot' allows new snapshot to be created with the name of
  an existing snapshot

Status in QEMU:
  New
Status in qemu package in Ubuntu:
  Triaged

Bug description:
  qemu-img _may_ be working as designed, but it feels like this could be
  a bug. I'd certainly prefer to only allow unique snapshot names
  (unless maybe something like a "--force-non-unique-snapshot-names" was
  also specified).

  If this really is correct behaviour, it should be documented as qemu-
  img(1) currently specifies no details whatsoever regarding expected
  behaviour or valid snapshot names.

  $ qemu-img snapshot -l image.cow 
  $ qemu-img snapshot -c foo image.cow        
  $ qemu-img snapshot -l image.cow            
  Snapshot list:
  ID        TAG                 VM SIZE                DATE       VM CLOCK
  1         foo                       0 2014-11-26 08:30:53   00:00:00.000
  $ qemu-img snapshot -c foo image.cow 
  $ qemu-img snapshot -l image.cow            
  Snapshot list:
  ID        TAG                 VM SIZE                DATE       VM CLOCK
  1         foo                       0 2014-11-26 08:30:53   00:00:00.000
  2         foo                       0 2014-11-26 08:30:58   00:00:00.000
  $ qemu-img snapshot -c foo image.cow 
  $ qemu-img snapshot -l image.cow            
  Snapshot list:
  ID        TAG                 VM SIZE                DATE       VM CLOCK
  1         foo                       0 2014-11-26 08:30:53   00:00:00.000
  2         foo                       0 2014-11-26 08:30:58   00:00:00.000
  3         foo                       0 2014-11-26 08:31:00   00:00:00.000
  $ qemu-img snapshot -d foo image.cow        
  $ qemu-img snapshot -l image.cow            
  Snapshot list:
  ID        TAG                 VM SIZE                DATE       VM CLOCK
  2         foo                       0 2014-11-26 08:30:58   00:00:00.000
  3         foo                       0 2014-11-26 08:31:00   00:00:00.000
  $ qemu-img snapshot -d foo image.cow 
  $ qemu-img snapshot -l image.cow            
  Snapshot list:
  ID        TAG                 VM SIZE                DATE       VM CLOCK
  3         foo                       0 2014-11-26 08:31:00   00:00:00.000
  $ qemu-img snapshot -d foo image.cow 
  $ qemu-img snapshot -l image.cow 
  $

  Note also how snapshot deletion works in reverse order - the oldest
  snapshot with a given name is deleted first.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: qemu-utils 2.1+dfsg-4ubuntu9
  ProcVersionSignature: Ubuntu 3.16.0-25.33-generic 3.16.7
  Uname: Linux 3.16.0-25-generic x86_64
  ApportVersion: 2.14.7-0ubuntu10
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Wed Nov 26 08:28:16 2014
  InstallationDate: Installed on 2014-04-11 (228 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Daily amd64 (20140409)
  KvmCmdLine:
   COMMAND         STAT  EUID  RUID   PID  PPID %CPU COMMAND
   kvm-irqfd-clean S<       0     0   719     2  0.0 [kvm-irqfd-clean]
  MachineType: LENOVO 20AQCTO1WW
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.16.0-25-generic 
root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
  SourcePackage: qemu
  UpgradeStatus: Upgraded to vivid on 2014-05-08 (201 days ago)
  dmi.bios.date: 02/10/2014
  dmi.bios.vendor: LENOVO
  dmi.bios.version: GJET71WW (2.21 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20AQCTO1WW
  dmi.board.vendor: LENOVO
  dmi.board.version: 0B98405 STD
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: 
dmi:bvnLENOVO:bvrGJET71WW(2.21):bd02/10/2014:svnLENOVO:pn20AQCTO1WW:pvrThinkPadT440s:rvnLENOVO:rn20AQCTO1WW:rvr0B98405STD:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 20AQCTO1WW
  dmi.product.version: ThinkPad T440s
  dmi.sys.vendor: LENOVO

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