[libvirt-users] virsh snapshot-create-as: change umask on snapshots

[Eric Blake]

On 3/20/19 1:50 PM, Mircea Husz wrote:
> I scripted the creation of snapshots and it works fine. Now I'd like to run the script as non-root.
> 
> virsh snapshot-create-as --domain hq-live-v01 \
>      --name snappy \
>      --diskspec vda,file=/var/lib/libvirt/images/hq-live-v01.snappy,snapshot=external \
>      --diskspec vdb,file=/var/lib/libvirt/images/hq-live-storage.snappy,snapshot=external \
>      --disk-only --quiesce --atomic
> 
> This fragment creates the snapshots, but get created with mode 0600:
> -rw-------  1 qemu qemu     393216 Mar 19 17:08 hq-live-storage.snappy
> -rw-------  1 qemu qemu    1048576 Mar 19 17:08 hq-live-v01.snappy
> 
> The user account is in the libvirt group and has permissions to do everything except delete the files created by the snapshot, all I need is to get the snapshots created with 0660 mode.
> 
> This is on a Centos 7.6 installation.  What knobs do I need to turn to control the umask?

I'm not sure if you can force libvirt to create the files with a
different mask, but perhaps a workaround would be to pre-create the
files yourself with desired permissions, then tell virsh to
--reuse-external (so that libvirt no longer has to try and create the
files, and thus doesn't mess with permissions).

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3226
Virtualization:  qemu.org | libvirt.org

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