Write a script in preparation for SHA identified LiteCore fetching du…

…ring build

src/build/do_fetch_litecore.ps1

@@ -0,0 +1,35 @@
+param(
+    [Parameter(Mandatory=$true)][string]$NexusRepo
+)
+
+pushd $PSScriptRoot\..\..\vendor\couchbase-lite-core\build_cmake
+$sha = $(& 'C:\Program Files\Git\bin\git.exe' rev-parse HEAD)
+Write-Host "Fetching variants for $sha..."
+$VARIANTS = @("macosx", "linux")
+$EXTENSIONS = @("zip", "tar.gz")
+try {
+    $i = 0
+    foreach ($variant in $VARIANTS) {
+        echo "Fetching $variant..."
+        Invoke-WebRequest $NexusRepo/couchbase-litecore-$variant/$sha/couchbase-litecore-$variant-$sha.$($EXTENSIONS[$i]) -Out litecore-$variant.$($EXTENSIONS[$i++])
+    }
+} catch [System.Net.WebException] {
+    popd
+    if($_.Exception.Status -eq [System.Net.WebExceptionStatus]::ProtocolError) {
+        $res = $_.Exception.Response.StatusCode
+        if($res -eq 404) {
+            Write-Host "$variant for $sha is not ready yet!"
+            exit 1
+        }
+    }
+
+    throw
+}
+
+& 7z e -y litecore-macosx.zip lib/libLiteCore.dylib
+& 7z x litecore-linux.tar.gz
+& 7z e -y litecore-linux.tar lib/*
+rm litecore-macosx.zip
+rm litecore-linux.tar
+rm litecore-linux.tar.gz
+popd