I'd say you could just create a snapshot in your account and write a
small main program that calls `listNodes` . Something like this:

try {
   String identity = "<client email>";  // Something like
"[email protected]"
   String credential = Files.toString(new File("<path to the GCE
account private key>"), Charsets.UTF_8);

   ComputeServiceContext ctx =
ContextBuilder.newBuilder("google-compute-engine")
      .credentials(identity, credential)
      .modules(ImmutableSet.of(new SshjSshClientModule()))
      .buildView(ComputeServiceContext.class);

   ComputeService compute = ctx.getComputeService();

   compute.listNodes();   // This will fail if there are snapshots
until the issue is fixed.
finally {
   ctx.close();
}

You'll just need to add the
"org.apache.jclouds.provider/google-compute-engine" and
"org.apache.jclouds.driver/jclouds-sshj" dependencies to run that
small program.


You can have a look at the README for more info on how to get the credentials:
https://github.com/jclouds/jclouds/tree/master/providers/google-compute-engine


HTH!

I.

On 8 March 2017 at 17:57, Tomasz Wojtun <[email protected]> wrote:
> Hi Ignasi.
>
> I will be glad to make a pull request. Can you tell me if there is an easy 
> way to test the fix in IDE?
>
> Regards,
> Tomasz
>
> On 07/03/2017, 14:32, "Ignasi Barrera" <[email protected]> wrote:
>
>     Hi Tomasz,
>
>     You're right. jclouds should not fail in that case, The
>     "diskuRIToImage" in the InstanceToNodeMetadata class is a cache, and
>     it makes no sense to try to load a "null" key. I'd say the right way
>     to fix it is just to execute this [1] only if the input disk's source
>     is not null. Do you want to try opening a pull request with a patch?
>     I'd be happy to help!
>
>
>     I.
>
>     [1] 
> https://github.com/jclouds/jclouds/blob/master/providers/google-compute-engine/src/main/java/org/jclouds/googlecomputeengine/compute/functions/InstanceToNodeMetadata.java#L77
>
>
>     On 7 March 2017 at 13:31, Tomasz Wojtun <[email protected]> 
> wrote:
>     > Hi Jclouds users.
>     >
>     >
>     >
>     > I want to use  jclouds-plugin on Jenkins to provide jenkina slave 
> machines
>     > on Google Compute.
>     >
>     > The plugin fails to count nodes with specific images, when it comes up 
> on
>     > instance created from snapshot.
>     >
>     > The cause seems to be in jclouds code.
>     >
>     > Shouldn’t diskURIToImage.getUnchecked() in InstanceToNodeMetadata return
>     > null and not throw an error in this case?
>     >
>     >
>     >
>     > Best regards,
>     >
>     > Tomasz
>     >
>     >
>     >
>     > StackTrace:
>     >
>     > Timer task hudson.slaves.NodeProvisioner$NodeProvisionerInvoker@79b4d01d
>     > failed
>     > shaded.com.google.common.util.concurrent.UncheckedExecutionException:
>     > java.util.concurrent.ExecutionException: could not find image for disk
>     > 
> https://www.googleapis.com/compute/v1/projects/PROJECT_ID/zones/ZONE/disks/INSTANCE_NAME:
>     > endpoint for [0] not configured for
>     > org.jclouds.googlecomputeengine.compute.functions.Resources.public 
> abstract
>     > org.jclouds.googlecomputeengine.domain.Image
>     > 
> org.jclouds.googlecomputeengine.compute.functions.Resources.image(java.net.URI)
>     > at
>     > 
> shaded.com.google.common.cache.LocalCache$LocalLoadingCache.getUnchecked(LocalCache.java:4829)
>     > at
>     > 
> org.jclouds.googlecomputeengine.compute.functions.InstanceToNodeMetadata.apply(InstanceToNodeMetadata.java:77)
>     > at
>     > 
> org.jclouds.googlecomputeengine.compute.functions.InstanceToNodeMetadata.apply(InstanceToNodeMetadata.java:43)
>     > at
>     > 
> shaded.com.google.common.base.Functions$FunctionComposition.apply(Functions.java:211)
>     > at
>     > 
> shaded.com.google.common.collect.Iterators$8.transform(Iterators.java:794)
>     > at
>     > 
> shaded.com.google.common.collect.TransformedIterator.next(TransformedIterator.java:48)
>     > at
>     > 
> shaded.com.google.common.collect.Iterators$7.computeNext(Iterators.java:646)
>     > at
>     > 
> shaded.com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:143)
>     > at
>     > 
> shaded.com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:138)
>     > at shaded.com.google.common.collect.Iterators.addAll(Iterators.java:356)
>     > at shaded.com.google.common.collect.Iterables.addAll(Iterables.java:350)
>     > at shaded.com.google.common.collect.Sets.newLinkedHashSet(Sets.java:328)
>     > at
>     > 
> org.jclouds.compute.internal.BaseComputeService.listNodes(BaseComputeService.java:342)
>     > at
>     > 
> jenkins.plugins.jclouds.compute.JCloudsCloud.getRunningNodesCount(JCloudsCloud.java:482)
>     > at
>     > 
> jenkins.plugins.jclouds.compute.JCloudsCloud.provision(JCloudsCloud.java:365)
>     > at
>     > 
> hudson.slaves.NodeProvisioner$StandardStrategyImpl.apply(NodeProvisioner.java:701)
>     > at hudson.slaves.NodeProvisioner.update(NodeProvisioner.java:307)
>     > at hudson.slaves.NodeProvisioner.access$000(NodeProvisioner.java:60)
>     > at
>     > 
> hudson.slaves.NodeProvisioner$NodeProvisionerInvoker.doRun(NodeProvisioner.java:798)
>     > at hudson.triggers.SafeTimerTask.run(SafeTimerTask.java:50)
>     > at 
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
>     > at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
>     > at
>     > 
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
>     > at
>     > 
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
>     > at
>     > 
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
>     > at
>     > 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
>     > at java.lang.Thread.run(Thread.java:745)
>     > Caused by: java.util.concurrent.ExecutionException: could not find 
> image for
>     > disk
>     > 
> https://www.googleapis.com/compute/v1/projects/PROJECT_ID/zones/ZONE/disks/INSTANCE_NAME:
>     > endpoint for [0] not configured for
>     > org.jclouds.googlecomputeengine.compute.functions.Resources.public 
> abstract
>     > org.jclouds.googlecomputeengine.domain.Image
>     > 
> org.jclouds.googlecomputeengine.compute.functions.Resources.image(java.net.URI)
>     > at
>     > 
> org.jclouds.googlecomputeengine.compute.loaders.DiskURIToImage.load(DiskURIToImage.java:50)
>     > at
>     > 
> org.jclouds.googlecomputeengine.compute.loaders.DiskURIToImage.load(DiskURIToImage.java:32)
>     > at
>     > 
> shaded.com.google.common.cache.LocalCache$LoadingValueReference.loadFuture(LocalCache.java:3524)
>     > at
>     > 
> shaded.com.google.common.cache.LocalCache$Segment.loadSync(LocalCache.java:2317)
>     > at
>     > 
> shaded.com.google.common.cache.LocalCache$Segment.lockedGetOrLoad(LocalCache.java:2280)
>     > at
>     > 
> shaded.com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2195)
>     > at shaded.com.google.common.cache.LocalCache.get(LocalCache.java:3934)
>     > at 
> shaded.com.google.common.cache.LocalCache.getOrLoad(LocalCache.java:3938)
>     > at
>     > 
> shaded.com.google.common.cache.LocalCache$LocalLoadingCache.get(LocalCache.java:4821)
>     > at
>     > 
> shaded.com.google.common.cache.LocalCache$LocalLoadingCache.getUnchecked(LocalCache.java:4827)
>     > ... 26 more
>     > Caused by: java.lang.IllegalArgumentException: endpoint for [0] not
>     > configured for
>     > org.jclouds.googlecomputeengine.compute.functions.Resources.public 
> abstract
>     > org.jclouds.googlecomputeengine.domain.Image
>     > 
> org.jclouds.googlecomputeengine.compute.functions.Resources.image(java.net.URI)
>     > at
>     > 
> shaded.com.google.common.base.Preconditions.checkArgument(Preconditions.java:148)
>     > at
>     > 
> org.jclouds.rest.internal.RestAnnotationProcessor.getEndpointInParametersOrNull(RestAnnotationProcessor.java:526)
>     > at
>     > 
> org.jclouds.rest.internal.RestAnnotationProcessor.getEndpointFor(RestAnnotationProcessor.java:548)
>     > at
>     > 
> org.jclouds.rest.internal.RestAnnotationProcessor.apply(RestAnnotationProcessor.java:204)
>     > at
>     > 
> org.jclouds.rest.internal.RestAnnotationProcessor.apply(RestAnnotationProcessor.java:137)
>     > at
>     > 
> org.jclouds.rest.internal.InvokeHttpMethod.toCommand(InvokeHttpMethod.java:188)
>     > at
>     > 
> org.jclouds.rest.internal.InvokeHttpMethod.invoke(InvokeHttpMethod.java:84)
>     > at
>     > 
> org.jclouds.rest.internal.InvokeHttpMethod.apply(InvokeHttpMethod.java:73)
>     > at
>     > 
> org.jclouds.rest.internal.InvokeHttpMethod.apply(InvokeHttpMethod.java:44)
>     > at
>     > 
> org.jclouds.rest.internal.DelegatesToInvocationFunction.handle(DelegatesToInvocationFunction.java:156)
>     > at
>     > 
> org.jclouds.rest.internal.DelegatesToInvocationFunction.invoke(DelegatesToInvocationFunction.java:123)
>     > at com.sun.proxy.$Proxy109.image(Unknown Source)
>     > at
>     > 
> org.jclouds.googlecomputeengine.compute.loaders.DiskURIToImage.load(DiskURIToImage.java:48)
>     > ... 35 more
>     >
>     >
>
>

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