Bug 1120544

Summary:	"sudo guestmount" changes the owner of a vdi file to qemu.qemu and does not reset the owner to the original one if unmounting with guestunmount
Product:	[Community] Virtualization Tools	Reporter:	Joachim Backes <joachim.backes>
Component:	libvirt	Assignee:	Libvirt Maintainers <libvirt-maint>
Status:	CLOSED DUPLICATE	QA Contact:
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	unspecified	CC:	crobinso, mbooth, ptoscano, rbalakri, rjones, virt-maint
Target Milestone:	---
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2016-04-10 19:06:05 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	910269

Description Joachim Backes 2014-07-17 06:54:34 UTC

Description of problem:
Guest mounting a vdi file belonging to some user with "sudo guestmount -a <vdi file> -i --ro <mountpoint>"  sets the owner of the vdi file to qemu.qemu, but does not restore the original owner if unmounting with guestunmount.

Version-Release number of selected component (if applicable):
libguestfs-1.26.5-1.fc20.x86_64


How reproducible:
always

Steps to Reproduce:
1.sudo guestmount -a <some user vdi file> -i --ro <mount point>
2.sudo guestunmount <mount point>
3.

Actual results:
The owner of <some user vdi file> is now qemu.qemu

Expected results:
The owner is reset to the original owner

Additional info:

ls -l /vbox/win7.vdi

-rw-------. 1 backes backes 35174649856 Jul 17 07:01 /vbox/win7.vdi
backes@eule [~]: sudo guestmount -a /vbox/win7.vdi -i --ro /mnt
backes@eule [~]: ls -l /vbox/win7.vdi
-rw-------. 1 qemu qemu 35174649856 Jul 17 07:01 /vbox/win7.vdi
backes@eule [~]: sudo guestunmount /mnt
backes@eule [~]: ls -l /vbox/win7.vdi
-rw-------. 1 qemu qemu 35174649856 Jul 17 07:01 /vbox/win7.vdi

Comment 1 Richard W.M. Jones 2014-07-17 07:40:18 UTC

libvirt does the chown.  It should chown it back, but does not.
I think there is an open bug about this.

If you want to avoid it, then tell libguestfs to run qemu directly,
without using libvirt:

  export LIBGUESTFS_BACKEND=direct

Comment 2 Cole Robinson 2016-04-10 19:06:05 UTC

The lack of restoring to the original owner/group is tracked in bug 636156

*** This bug has been marked as a duplicate of bug 636156 ***