Add npm install retries to deployment

Author: Matt Mason

.deployment

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+[config]
+command = deploy.cmd

deploy.cmd

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+@if "%SCM_TRACE_LEVEL%" NEQ "4" @echo off
+
+:: ----------------------
+:: KUDU Deployment Script
+:: Version: 1.0.6
+:: ----------------------
+
+:: Prerequisites
+:: -------------
+
+:: Verify node.js installed
+where node 2>nul >nul
+IF %ERRORLEVEL% NEQ 0 (
+  echo Missing node.js executable, please install node.js, if already installed make sure it can be reached from current environment.
+  goto error
+)
+
+:: Setup
+:: -----
+
+setlocal enabledelayedexpansion
+
+SET ARTIFACTS=%~dp0%..\artifacts
+
+IF NOT DEFINED DEPLOYMENT_SOURCE (
+  SET DEPLOYMENT_SOURCE=%~dp0%.
+)
+
+IF NOT DEFINED DEPLOYMENT_TARGET (
+  SET DEPLOYMENT_TARGET=%ARTIFACTS%\wwwroot
+)
+
+IF NOT DEFINED NEXT_MANIFEST_PATH (
+  SET NEXT_MANIFEST_PATH=%ARTIFACTS%\manifest
+
+  IF NOT DEFINED PREVIOUS_MANIFEST_PATH (
+    SET PREVIOUS_MANIFEST_PATH=%ARTIFACTS%\manifest
+  )
+)
+
+IF NOT DEFINED KUDU_SYNC_CMD (
+  :: Install kudu sync
+  echo Installing Kudu Sync
+  call npm install kudusync -g --silent
+  IF !ERRORLEVEL! NEQ 0 goto error
+
+  :: Locally just running "kuduSync" would also work
+  SET KUDU_SYNC_CMD=%appdata%\npm\kuduSync.cmd
+)
+goto Deployment
+
+:: Utility Functions
+:: -----------------
+
+:SelectNodeVersion
+
+IF DEFINED KUDU_SELECT_NODE_VERSION_CMD (
+  :: The following are done only on Windows Azure Websites environment
+  call %KUDU_SELECT_NODE_VERSION_CMD% "%DEPLOYMENT_SOURCE%" "%DEPLOYMENT_TARGET%" "%DEPLOYMENT_TEMP%"
+  IF !ERRORLEVEL! NEQ 0 goto error
+
+  IF EXIST "%DEPLOYMENT_TEMP%\__nodeVersion.tmp" (
+    SET /p NODE_EXE=<"%DEPLOYMENT_TEMP%\__nodeVersion.tmp"
+    IF !ERRORLEVEL! NEQ 0 goto error
+  )
+  
+  IF EXIST "%DEPLOYMENT_TEMP%\__npmVersion.tmp" (
+    SET /p NPM_JS_PATH=<"%DEPLOYMENT_TEMP%\__npmVersion.tmp"
+    IF !ERRORLEVEL! NEQ 0 goto error
+  )
+
+  IF NOT DEFINED NODE_EXE (
+    SET NODE_EXE=node
+  )
+
+  SET NPM_CMD="!NODE_EXE!" "!NPM_JS_PATH!"
+) ELSE (
+  SET NPM_CMD=npm
+  SET NODE_EXE=node
+)
+
+goto :EOF
+
+::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+:: Deployment
+:: ----------
+
+:Deployment
+echo Handling node.js deployment.
+
+:: 1. KuduSync
+IF /I "%IN_PLACE_DEPLOYMENT%" NEQ "1" (
+  call :ExecuteCmd "%KUDU_SYNC_CMD%" -v 50 -f "%DEPLOYMENT_SOURCE%" -t "%DEPLOYMENT_TARGET%" -n "%NEXT_MANIFEST_PATH%" -p "%PREVIOUS_MANIFEST_PATH%" -i ".git;.hg;.deployment;deploy.cmd"
+  IF !ERRORLEVEL! NEQ 0 goto error
+)
+
+:: 2. Select node version
+call :SelectNodeVersion
+
+:: 3. Install npm packages. Attempt up to 3 times in the event of failures
+IF EXIST "%DEPLOYMENT_TARGET%\package.json" (
+  pushd "%DEPLOYMENT_TARGET%"
+  FOR /L %%A IN (1,1,3) DO (
+    call !NPM_CMD! install --production
+    IF !ERRORLEVEL!==0 goto npmInstallSuccess
+    IF %%A NEQ 3 SLEEP 5
+  )
+  goto error
+:npmInstallSuccess
+ popd
+ )
+
+::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+
+:: Post deployment stub
+IF DEFINED POST_DEPLOYMENT_ACTION call "%POST_DEPLOYMENT_ACTION%"
+IF !ERRORLEVEL! NEQ 0 goto error
+
+goto end
+
+:: Execute command routine that will echo out when error
+:ExecuteCmd
+setlocal
+set _CMD_=%*
+call %_CMD_%
+if "%ERRORLEVEL%" NEQ "0" echo Failed exitCode=%ERRORLEVEL%, command=%_CMD_%
+exit /b %ERRORLEVEL%
+
+:error
+endlocal
+echo An error has occurred during web site deployment.
+call :exitSetErrorLevel
+call :exitFromFunction 2>nul
+
+:exitSetErrorLevel
+exit /b 1
+
+:exitFromFunction
+()
+
+:end
+endlocal
+echo Finished successfully.