I am attempting to upload a new Master Page to a SharePoint 2013 site using Powershell.
I am copying the .html file to the "Master Page Gallery" list successfully but I cannot find any way of having the .master file generated without manually visiting the Design Manager in my web browser.
Is it possible to upload a .html Master Page through Powershell and have the .master generated so I can set it as the default Master Page?
I found I needed to add it, check it out, call update, check it in and publish it. So:
$web = Get-SPWeb $site
$folder = $web.getfolder("_catalogs/masterpage")
$files = $folder.Files
$mPage = Get-Item "C:\path to your\masterpage.html"
$file = $files.Add("masterpage.html", $mPage.OpenRead(), $true)
$file.CheckOut()
$file.update()
$file.CheckIn("")
$file.Publish("")
.update() on the File but I needed to call .update() on the list Item instead