[libvirt] [PATCH 09/12] qemu_process: introduce qemuProcessCreateCmd

[Cole Robinson]

On 03/15/2016 09:16 AM, Pavel Hrdina wrote:
> This will skip few steps from qemuProcessStart in order to create only
> qemu CMD.  Use a VIR_QEMU_PROCESS_START_PRETEND for all the qemuProcess*
> functions called by this one to not modify or check host.
> 
> This new function will be used later on for XMLToNative API and also for
> qemuxml2argvtest to make sure that both API and test uses the same code
> as qemuProcessStart.
> 
> We need also update qemuProcessInit to wrap few lines of code with check
> that VIR_QEMU_PROCESS_START_PRETEND that makes sense only for
> qemuProcessStart.
> 
> Signed-off-by: Pavel Hrdina <phrdina at redhat.com>
> ---
>  src/qemu/qemu_process.c | 73 +++++++++++++++++++++++++++++++++++++++++--------
>  src/qemu/qemu_process.h |  7 +++++
>  2 files changed, 69 insertions(+), 11 deletions(-)
> 
> diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c
> index 9894e3c..dd85276 100644
> --- a/src/qemu/qemu_process.c
> +++ b/src/qemu/qemu_process.c
> @@ -4477,19 +4477,20 @@ qemuProcessInit(virQEMUDriverPtr driver,
>      if (virDomainObjSetDefTransient(caps, driver->xmlopt, vm, true) < 0)
>          goto stop;
>  
> +    if (!(flags & VIR_QEMU_PROCESS_START_PRETEND)) {
> +        vm->def->id = qemuDriverAllocateID(driver);
> +        qemuDomainSetFakeReboot(driver, vm, false);
> +        virDomainObjSetState(vm, VIR_DOMAIN_PAUSED, VIR_DOMAIN_PAUSED_STARTING_UP);
>  
> -    vm->def->id = qemuDriverAllocateID(driver);
> -    qemuDomainSetFakeReboot(driver, vm, false);
> -    virDomainObjSetState(vm, VIR_DOMAIN_PAUSED, VIR_DOMAIN_PAUSED_STARTING_UP);
> +        if (virAtomicIntInc(&driver->nactive) == 1 && driver->inhibitCallback)
> +            driver->inhibitCallback(true, driver->inhibitOpaque);
>  
> -    if (virAtomicIntInc(&driver->nactive) == 1 && driver->inhibitCallback)
> -        driver->inhibitCallback(true, driver->inhibitOpaque);
> -
> -    /* Run an early hook to set-up missing devices */
> -    if (qemuProcessStartHook(driver, vm,
> -                             VIR_HOOK_QEMU_OP_PREPARE,
> -                             VIR_HOOK_SUBOP_BEGIN) < 0)
> -        goto stop;
> +        /* Run an early hook to set-up missing devices */
> +        if (qemuProcessStartHook(driver, vm,
> +                                 VIR_HOOK_QEMU_OP_PREPARE,
> +                                 VIR_HOOK_SUBOP_BEGIN) < 0)
> +            goto stop;
> +    }
>  
>      if (qemuDomainSetPrivatePaths(&priv->libDir,
>                                    &priv->channelTargetDir,
> @@ -5466,6 +5467,56 @@ qemuProcessStart(virConnectPtr conn,
>  }
>  
>  
> +virCommandPtr
> +qemuProcessCreateCmd(virConnectPtr conn,
> +                     virQEMUDriverPtr driver,
> +                     virDomainObjPtr vm,
> +                     const char *migrateURI,
> +                     bool forceFips,
> +                     bool standalone,
> +                     unsigned int flags)
> +{
> +    qemuDomainObjPrivatePtr priv = vm->privateData;
> +    virCommandPtr cmd = NULL;
> +
> +    virCheckFlagsGoto(VIR_QEMU_PROCESS_START_COLD |
> +                      VIR_QEMU_PROCESS_START_PAUSED |
> +                      VIR_QEMU_PROCESS_START_AUTODESTROY, cleanup);
> +
> +    flags |= VIR_QEMU_PROCESS_START_PRETEND;
> +
> +    if (qemuProcessInit(driver, vm, QEMU_ASYNC_JOB_NONE, !!migrateURI,
> +                        false, flags) < 0)
> +        goto cleanup;
> +
> +    if (qemuProcessPrepareDomain(conn, driver, vm, flags) < 0)
> +        goto cleanup;
> +
> +    VIR_DEBUG("Building emulator command line");
> +    cmd = qemuBuildCommandLine(conn,
> +                               driver,
> +                               NULL,
> +                               vm->def,
> +                               priv->monConfig,
> +                               priv->monJSON,
> +                               priv->qemuCaps,
> +                               migrateURI,
> +                               NULL,
> +                               VIR_NETDEV_VPORT_PROFILE_OP_NO_OP,
> +                               &buildCommandLineCallbacks,
> +                               standalone,
> +                               forceFips ? true : qemuCheckFips(),
> +                               priv->autoNodeset,
> +                               NULL,
> +                               NULL,
> +                               priv->libDir,
> +                               priv->channelTargetDir);
> +
> + cleanup:
> +    return cmd;
> +}
> +
> +
>  int
>  qemuProcessKill(virDomainObjPtr vm, unsigned int flags)
>  {
> diff --git a/src/qemu/qemu_process.h b/src/qemu/qemu_process.h
> index 4820047..9e16aaf 100644
> --- a/src/qemu/qemu_process.h
> +++ b/src/qemu/qemu_process.h
> @@ -81,6 +81,13 @@ int qemuProcessStart(virConnectPtr conn,
>                       virNetDevVPortProfileOp vmop,
>                       unsigned int flags);
>  
> +virCommandPtr qemuProcessCreateCmd(virConnectPtr conn,
> +                                   virQEMUDriverPtr driver,
> +                                   virDomainObjPtr vm,
> +                                   const char *migrateURI,
> +                                   bool forceFips,
> +                                   bool standalone,
> +                                   unsigned int flags);
>  
>  int qemuProcessStartValidate(virQEMUDriverPtr driver,
>                               virDomainObjPtr vm,
> 

Can you call this qemuProcessCreatePretendCmd or something along those lines?
The name is too generic, sounds like it's going to end up in the regular
startup call chain

ACK otherwise

Thanks,
Cole