Jenkins needs to check whether the war's directory is writeable before offering to upgrade

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      Lifecycle#canRewriteHudsonWar assumes in-place replacement of the war, while UpdateCenter#download actually writes to a temporary file first to prevent breaking the file if an error occurs. This can lead to the following exception:

      hudson.util.IOException2: Failed to download from http://updates.jenkins-ci.org/download/war/1.570/jenkins.war (redirected to: http://jenkins.mirror.isppower.de/war/1.570/jenkins.war)
	at hudson.model.UpdateCenter$UpdateCenterConfiguration.download(UpdateCenter.java:791)
	at hudson.model.UpdateCenter$DownloadJob._run(UpdateCenter.java:1138)
	at hudson.model.UpdateCenter$DownloadJob.run(UpdateCenter.java:1116)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
	at java.util.concurrent.FutureTask.run(FutureTask.java:262)
	at hudson.remoting.AtmostOneThreadExecutor$Worker.run(AtmostOneThreadExecutor.java:104)
	at java.lang.Thread.run(Thread.java:744)
Caused by: java.io.FileNotFoundException: /usr/lib/jenkins/jenkins.war.tmp (Permission denied)
	at java.io.FileOutputStream.open(Native Method)
	at java.io.FileOutputStream.<init>(FileOutputStream.java:221)
	at java.io.FileOutputStream.<init>(FileOutputStream.java:171)
	at hudson.model.UpdateCenter$UpdateCenterConfiguration.download(UpdateCenter.java:762)
	... 6 more

            Assignee:
            Daniel Beck
            Reporter:
            Daniel Beck
            Archiver:
            Jenkins Service Account

              Created:
              Updated:
              Resolved:
              Archived: