Could not write destination file: Access to path 'd:\a\src\...\Web.config' is denied

Question

I have a tfs project on visual studio online and created a build definition to compile this project. The project uses web config transformation. The build will be executed from the visual studio online hosted build controller and it fails because of the following error:

Could not write destination file: Access to path 'd:\a\src...\Web.config' is denied.

Any ideas how to resolve this issue?

Answer 1

Sounds like the classic problem of read-only files (see cannot modify .csproj files using build auto with tfs 13). Run a pre-build Powershell script that removes the attribute, something like this

Get-ChildItem -Include *.config -Recurse | foreach {
    if ($_.IsReadOnly) { $_.IsReadOnly = $false }
}