Major Description
We should validate the git URL provided.
Otherwise the users may not noticed any issue until their instance get activated.
Noticed following in Cartridge Agent Log.
2014-04-11 14:17:54,546 [-] [Artifact Update Thread - /var/www/] WARN GitBasedArtifactRepository Git pull unsuccessful for tenant 1, No value for key branch.master.merge found in configuration
2014-04-11 14:17:54,959 [-] [Artifact Update Thread - /var/www/] ERROR GitBasedArtifactRepository Git clone operation for tenant 1 failed
org.eclipse.jgit.api.errors.InvalidRemoteException: Invalid remote: origin
at org.eclipse.jgit.api.FetchCommand.call(FetchCommand.java:134)
at org.eclipse.jgit.api.CloneCommand.fetch(CloneCommand.java:179)
at org.eclipse.jgit.api.CloneCommand.call(CloneCommand.java:125)
at org.apache.stratos.cartridge.agent.artifact.deployment.synchronizer.git.impl.GitBasedArtifactRepository.cloneRepository(GitBasedArtifactRepository.java:653)
at org.apache.stratos.cartridge.agent.artifact.deployment.synchronizer.git.impl.GitBasedArtifactRepository.pullArtifacts(GitBasedArtifactRepository.java:551)
at org.apache.stratos.cartridge.agent.artifact.deployment.synchronizer.git.impl.GitBasedArtifactRepository.checkout(GitBasedArtifactRepository.java:459)
at org.apache.stratos.cartridge.agent.artifact.deployment.synchronizer.git.impl.GitBasedArtifactRepository$ArtifactSyncTask.run(GitBasedArtifactRepository.java:718)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:304)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:178)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:744)
Caused by: org.eclipse.jgit.errors.NoRemoteRepositoryException: https://github.com/chrishantha/stratos-drupal: https://github.com/chrishantha/stratos-drupal/info/refs?service=git-upload-pack not found
at org.eclipse.jgit.transport.TransportHttp.connect(TransportHttp.java:468)
at org.eclipse.jgit.transport.TransportHttp.openFetch(TransportHttp.java:308)
at org.eclipse.jgit.transport.FetchProcess.executeImp(FetchProcess.java:136)
at org.eclipse.jgit.transport.FetchProcess.execute(FetchProcess.java:122)
at org.eclipse.jgit.transport.Transport.fetch(Transport.java:1104)
at org.eclipse.jgit