Adds Windows Jenkins Slave update script

Author: alexpilotti

UpdateJenkinsSlave.ps1

@@ -0,0 +1,29 @@
+# Schedule with:
+# schtasks.exe /create /tn Jenkins-Slave-Update /tr "powershell -NonInteractive -File c:\Tools\UpdateJenkinsSlave.ps1" /sc DAILY /ru Administrator /rp /st 01:00:00
+
+$ErrorActionPreference = "Stop"
+
+$jenkinsBaseUrl = "http://10.73.76.93:8080"
+$jenkinsSlaveDir = "c:\Jenkins"
+
+$tmpFile = "$jenkinsSlaveDir\slave.jar.tmp"
+$slaveJar = "$jenkinsSlaveDir\slave.jar"
+
+Invoke-WebRequest -Uri "$jenkinsBaseUrl/jnlpJars/slave.jar" -OutFile $tmpFile
+
+$tmpFileHash = (Get-FileHash $tmpFile).Hash
+$oldFileHash = (Get-FileHash $slaveJar).Hash
+
+if ($tmpFileHash -ne $oldFileHash) {
+    echo "Updating $slaveJar"
+    net stop 'Jenkins Slave'
+    get-process | where {$_.Name -eq 'java'} | kill
+    del $slaveJar
+    move $tmpFile $slaveJar
+    net start 'Jenkins Slave'
+}
+else {
+    echo "No need to update"
+    del $tmpFile
+}
+