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debug: 0.889
register: 0.873
device: 0.869
assembly: 0.864
peripherals: 0.864
user-level: 0.859
permissions: 0.858
virtual: 0.858
architecture: 0.844
performance: 0.843
risc-v: 0.831
graphic: 0.831
kernel: 0.828
mistranslation: 0.822
KVM: 0.821
PID: 0.817
files: 0.815
semantic: 0.815
network: 0.795
socket: 0.793
arm: 0.791
hypervisor: 0.783
i386: 0.758
vnc: 0.743
ppc: 0.742
VMM: 0.740
TCG: 0.733
boot: 0.730
x86: 0.679
qemu-img permission denied on vmdk creation on CIFS share
- on a CIFS mount qemu-img claims not to have permissions to write into a file.
- VMDK sparse file creation succeeds
- VMDK Flat file creation create the flat-file, but fails to write the description-file
- VMDK flat file creation succeeds on native linux mount such as ~/tmp or /tmp
- same effect as root or non-root
- same effect with selinux setenforce 0
a) I would have expected that the monolithic flat would have created only one large file just like sparse, but it seems to create a description file, in addition to the storing file.
b) I am aware that qemu-img may have problem opening very large files on CIFS, however, this file is not very large
Windows-10 latest updated 2004 19041.388
Linux VM, Fedora-32 in Virtualbox 6.1.12
# rpm -qa | grep qemu-img
qemu-img-4.2.0-7.fc32.x86_64
mount options:
mount -t cifs //10.x,x,x/$shname /mnt/hshare -o defaults,username=gana,rw,uid=1000,gid=1000,vers=3.0
[root@fedora ~]# cd /mnt/hshare/some/folder/createvmdk/
[root@fedora createvmdk]# qemu-img create -f vmdk test1.vmdk 100M -o subformat=monolithicFlat
Formatting 'test1.vmdk', fmt=vmdk size=104857600 compat6=off hwversion=undefined subformat=monolithicFlat
qemu-img: test1.vmdk: Could not write description: Permission denied
[root@fedora createvmdk]# ls -l test1*.*
-rwxr-xr-x. 1 gana gana 104857600 Jul 26 23:02 test1-flat.vmdk
-rwxr-xr-x. 1 gana gana 0 Jul 26 23:02 test1.vmdk
[root@fedora createvmdk]# du -k test1*.*
0 test1-flat.vmdk
0 test1.vmdk
# (doesn't seem to be really flat)
creation in /tmp works
# cd /tmp
[root@fedora tmp]# qemu-img create -f vmdk test1.vmdk 100M -o subformat=monolithicFlat
Formatting 'test1.vmdk', fmt=vmdk size=104857600 compat6=off hwversion=undefined subformat=monolithicFlat
[root@fedora tmp]# ls -l /tmp/test1*.*
-rw-r--r--. 1 root root 104857600 Jul 26 22:43 /tmp/test1-flat.vmdk
-rw-r--r--. 1 root root 313 Jul 26 22:43 /tmp/test1.vmdk
[root@fedora createvmdk]# du -k /tmp/test1*.*
4 /tmp/test1-flat.vmdk
4 /tmp/test1.vmdk
[root@fedora createvmdk]# cat /tmp/test1.vmdk
# Disk DescriptorFile
version=1
CID=5f13c13d
parentCID=ffffffff
createType="monolithicFlat"
# Extent description
RW 204800 FLAT "test1-flat.vmdk" 0
# The Disk Data Base
#DDB
ddb.virtualHWVersion = "4"
ddb.geometry.cylinders = "203"
ddb.geometry.heads = "16"
ddb.geometry.sectors = "63"
ddb.adapterType = "ide"
On the other-hand creating a sparse file works
cd /mnt/hshare/some/folder/createvmdk/
[root@fedora createvmdk]# qemu-img create -f vmdk test2.vmdk 100M -o subformat=monolithicSparse
Formatting 'test2.vmdk', fmt=vmdk size=104857600 compat6=off hwversion=undefined subformat=monolithicSparse
[root@fedora createvmdk]# ls l test2*.*
-rwxr-xr-x. 1 gana gana 65536 Jul 26 22:52 test2.vmdk
[root@fedora createvmdk]# du -k /tmp/test2*.*
12 /tmp/test2.vmdk
test2.vmdk is a binary file
inside it, located among garbled ascii characters is an embedded VMDK description
````
# Disk DescriptorFile
version=1
CID=cf302a20
parentCID=ffffffff
createType="monolithicSparse"
# Extent description
RW 204800 SPARSE "test2.vmdk"
# The Disk Data Base
#DDB
ddb.virtualHWVersion = "4"
ddb.geometry.cylinders = "203"
ddb.geometry.heads = "16"
ddb.geometry.sectors = "63"
ddb.adapterType = "ide"
```
I retract comment "a)I would have expected that the monolithic flat would have created only one large file just like sparse, but it seems to create a description file, in addition to the storing file."
pdf vmdk_specs-1.pdf "Virtual Disk Format 1.1" (https://www.vmware.com/app/vmdk/?src=vmdk) on page 7, line-34, a note is mentioned that says that is just how it is.
"A virtual disk described as monolithic and flat consists of two files. One file contains the descriptor. The other file is the extent used to store virtual machine data"
The QEMU project is currently moving 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 the bug state to "Incomplete" now.
If the bug has already been fixed in the latest upstream version of QEMU,
then please close this ticket as "Fix released".
If it is not fixed yet and you think that this bug report here is still
valid, then you have two options:
1) If you already have an account on gitlab.com, please open a new ticket
for this problem in our new tracker here:
https://gitlab.com/qemu-project/qemu/-/issues
and then close this ticket here on Launchpad (or let it expire auto-
matically after 60 days). Please mention the URL of this bug ticket on
Launchpad in the new ticket on GitLab.
2) If you don't have an account on gitlab.com and don't intend to get
one, but still would like to keep this ticket opened, then please switch
the state back to "New" within the next 60 days (otherwise it will get
closed as "Expired"). We will then eventually migrate the ticket auto-
matically to the new system (but you won't be the reporter of the bug
in the new system and thus won't get notified on changes anymore).
Thank you and sorry for the inconvenience.
[Expired for QEMU because there has been no activity for 60 days.]
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