[Bug 1396497] Re: 'qemu-img snapshot' allows new snapshot to be created with the name of an existing snapshot

[Thomas Huth]

The QEMU project is currently considering to move its bug tracking to another 
system. For this we need to know which bugs are still valid and which could be 
closed already. Thus we are setting older bugs to "Incomplete" now.
If you still think this bug report here is valid, then please switch the state 
back to "New" within the next 60 days, otherwise this report will be marked as 
"Expired". Or mark it as "Fix Released" if the problem has been solved with a 
newer version of QEMU already. Thank you and sorry for the inconvenience.

** Changed in: qemu
       Status: New => Incomplete

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

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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:
  Incomplete
Status in qemu package in Ubuntu:
  Incomplete

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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