[v2] qemu: change monitor.sock from /var/lib/libvirt/qemu/domain-*** to /var/run/libvirt/qemu/domain-***

[libvirt] [PATCH v2] qemu: change monitor.sock from /var/lib/libvirt/qemu/domain-*** to /var/run/libvirt/qemu/domain-***

Posted by xinhua.Cao 6 years, 6 months ago

directory /var/lib alway is Persistence directory, but in redhat system, /var/run is memory directory.
our running domain xml is saved at /var/run/libvirt/qemu. so if we cold reset system,
the /var/run/libvirt/qemu directory is clear, but /var/lib/libvirt/qemu/domain-*** is saved. so there
have same /var/lib/libvirt/qemu/domain-*** directory will be left over at system cold reset.
---
 src/qemu/qemu_domain.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
index ed27a91..3e6fe9b 100644
--- a/src/qemu/qemu_domain.c
+++ b/src/qemu/qemu_domain.c
@@ -1674,7 +1674,7 @@ qemuDomainSetPrivatePaths(virQEMUDriverPtr driver,
         goto cleanup;
 
     if (!priv->libDir &&
-        virAsprintf(&priv->libDir, "%s/domain-%s", cfg->libDir, domname) < 0)
+        virAsprintf(&priv->libDir, "%s/domain-%s", cfg->stateDir, domname) < 0)
         goto cleanup;
 
     if (!priv->channelTargetDir &&
-- 
2.8.3


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Re: [libvirt] [PATCH v2] qemu: change monitor.sock from /var/lib/libvirt/qemu/domain-*** to /var/run/libvirt/qemu/domain-***

Posted by Michal Privoznik 6 years, 6 months ago

On 10/16/2017 04:08 AM, xinhua.Cao wrote:
> directory /var/lib alway is Persistence directory, but in redhat system, /var/run is memory directory.
> our running domain xml is saved at /var/run/libvirt/qemu. so if we cold reset system,
> the /var/run/libvirt/qemu directory is clear, but /var/lib/libvirt/qemu/domain-*** is saved. so there
> have same /var/lib/libvirt/qemu/domain-*** directory will be left over at system cold reset.
> ---
>  src/qemu/qemu_domain.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
> index ed27a91..3e6fe9b 100644
> --- a/src/qemu/qemu_domain.c
> +++ b/src/qemu/qemu_domain.c
> @@ -1674,7 +1674,7 @@ qemuDomainSetPrivatePaths(virQEMUDriverPtr driver,
>          goto cleanup;
>  
>      if (!priv->libDir &&
> -        virAsprintf(&priv->libDir, "%s/domain-%s", cfg->libDir, domname) < 0)
> +        virAsprintf(&priv->libDir, "%s/domain-%s", cfg->stateDir, domname) < 0)
>          goto cleanup;
>  
>      if (!priv->channelTargetDir &&
> 

Almost. I see a problem with this patch. Problem is that
qemuxml2argvtest needs to be updated. Which is not trivial because state
dir is a tempdir (mkdtemp()), and thus '-monitor' part of the command
line changes with each test invocation.

Michal

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[libvirt] 答复: [PATCH v2] qemu: change monitor.sock from /var/lib/libvirt/qemu/domain-*** to /var/run/libvirt/qemu/domain-***

Posted by Caoxinhua 6 years, 5 months ago

Yes,In qemuxml2argvtest case, mymain call qemuTestDriverInit to init qemu driver, qemuTestDriverInit call mkdtemp() to init stateDir, so stateDir is randomly.  But '-monitor' part of the command line must be a const value. Can I use a const value "/tmp/lib" to instead of random value at qemuxml2argvtest?

-----邮件原件-----
发件人: Michal Privoznik [mailto:mprivozn@redhat.com] 
发送时间: 2017年10月27日 0:17
收件人: Caoxinhua; libvir-list@redhat.com; jferlan@redhat.com; mkletzan@redhat.com; berrange@redhat.com
抄送: Yanqiangjun; Huangweidong (C); Wangjing (King, Euler); weifuqiang
主题: Re: [libvirt] [PATCH v2] qemu: change monitor.sock from /var/lib/libvirt/qemu/domain-*** to /var/run/libvirt/qemu/domain-***

On 10/16/2017 04:08 AM, xinhua.Cao wrote:
> directory /var/lib alway is Persistence directory, but in redhat system, /var/run is memory directory.
> our running domain xml is saved at /var/run/libvirt/qemu. so if we 
> cold reset system, the /var/run/libvirt/qemu directory is clear, but 
> /var/lib/libvirt/qemu/domain-*** is saved. so there have same /var/lib/libvirt/qemu/domain-*** directory will be left over at system cold reset.
> ---
>  src/qemu/qemu_domain.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c index 
> ed27a91..3e6fe9b 100644
> --- a/src/qemu/qemu_domain.c
> +++ b/src/qemu/qemu_domain.c
> @@ -1674,7 +1674,7 @@ qemuDomainSetPrivatePaths(virQEMUDriverPtr driver,
>          goto cleanup;
>  
>      if (!priv->libDir &&
> -        virAsprintf(&priv->libDir, "%s/domain-%s", cfg->libDir, domname) < 0)
> +        virAsprintf(&priv->libDir, "%s/domain-%s", cfg->stateDir, 
> + domname) < 0)
>          goto cleanup;
>  
>      if (!priv->channelTargetDir &&
> 

Almost. I see a problem with this patch. Problem is that qemuxml2argvtest needs to be updated. Which is not trivial because state dir is a tempdir (mkdtemp()), and thus '-monitor' part of the command line changes with each test invocation.

Michal

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Re: [libvirt]答复: [PATCH v2] qemu: change monitor.sock from /var/lib/libvirt/qemu/domain-*** to /var/run/libvirt/qemu/domain-***

Posted by Michal Privoznik 6 years, 5 months ago

On 10/27/2017 03:47 AM, Caoxinhua wrote:
> Yes,In qemuxml2argvtest case, mymain call qemuTestDriverInit to init qemu driver, qemuTestDriverInit call mkdtemp() to init stateDir, so stateDir is randomly.  But '-monitor' part of the command line must be a const value. Can I use a const value "/tmp/lib" to instead of random value at qemuxml2argvtest?

We will have to. Looks like we don't need stateDir nor configDir in the
test anyway.

Michal

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Re: [libvirt]答复: [PATCH v2] qemu: change monitor.sock from /var/lib/libvirt/qemu/domain-*** to /var/run/libvirt/qemu/domain-***

Posted by Daniel P. Berrange 6 years, 5 months ago

On Fri, Oct 27, 2017 at 10:25:23AM +0200, Michal Privoznik wrote:
> On 10/27/2017 03:47 AM, Caoxinhua wrote:
> > Yes,In qemuxml2argvtest case, mymain call qemuTestDriverInit to init qemu driver, qemuTestDriverInit call mkdtemp() to init stateDir, so stateDir is randomly.  But '-monitor' part of the command line must be a const value. Can I use a const value "/tmp/lib" to instead of random value at qemuxml2argvtest?
> 
> We will have to. Looks like we don't need stateDir nor configDir in the
> test anyway.

I would suggest  '/does-not-exist'  so we see a hard fail if we accidentally
have something in the test suite that tries to create a file in that
dir.   Using fixed filenames in /tmp is  a big no-no in general.


Regards,
Daniel
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Re: [libvirt]答复: [PATCH v2] qemu: change monitor.sock from /var/lib/libvirt/qemu/domain-*** to /var/run/libvirt/qemu/domain-***

Posted by Michal Privoznik 6 years, 5 months ago

On 10/27/2017 10:57 AM, Daniel P. Berrange wrote:
> On Fri, Oct 27, 2017 at 10:25:23AM +0200, Michal Privoznik wrote:
>> On 10/27/2017 03:47 AM, Caoxinhua wrote:
>>> Yes,In qemuxml2argvtest case, mymain call qemuTestDriverInit to init qemu driver, qemuTestDriverInit call mkdtemp() to init stateDir, so stateDir is randomly.  But '-monitor' part of the command line must be a const value. Can I use a const value "/tmp/lib" to instead of random value at qemuxml2argvtest?
>>
>> We will have to. Looks like we don't need stateDir nor configDir in the
>> test anyway.
> 
> I would suggest  '/does-not-exist'  so we see a hard fail if we accidentally
> have something in the test suite that tries to create a file in that
> dir.   Using fixed filenames in /tmp is  a big no-no in general.

Well, we already use /tmp/lib/ for the monitor path. So sticking with it
means we don't have to update all of those ~600 files. Moreover, we
don't really create the dirs/files. But sure, having /does-not-exist may
be more robust.

Michal

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