This is a fork from https://github.com/qetza/vsts-xdttransform-task all credits go to the original author. Please donate to him for his awesome work. My work is only a poor implementation for wildcard support.
XDT transform task
Visual Studio Team Services Build and Release extension that applies XDT transforms on XML files.
Usage
Add a new task, select XDT Transform from the Utility category and configure it as needed.
Parameters include:
Working folder: the working directory for relative paths. If not specified the default working directory will be used.
Transformations: an absolute or relative comma or newline-separated transformation file rules.
web.release.config => web.config will apply web.release.config to web.config and update the file.
xdt\web.release.config => config\web.config => web.config will apply xdt\web.release.config to config\web.config and save the result in web.config.
*.release.config => .config enabled wildcard search, the search should start with *. This will apply all {filename}.release.config files to the {filename}.config of the same name. The search is recursive from the working directory.
*.release.config => .config => .xml enabled wildcard search, the search should start with *. This will apply all {filename}.release.config files to the {filename}.config and save it in the {filename}.xml. The search is recursive from the working directory.
Tips
You can use the XDT tranform task to inject tokens in your XML based configuration files configured for local development and then use the Replace Tokens task to replace those tokens with variable values:
create an XDT transformation file containing your tokens
setup your configuration file with local developement values
at deployment time
inject your tokens in the configuration file by using your transformation file
replace tokens in your updated configuration file
Debug
You can set the variable system.debug to true to enable the debug logging on the task to help you investigate unexpected behavior of the task.
If you cannot fix your issue, open an issue on the github repo and i'll help you :)
Release notes
New in 3.0.0
Add support wildcards.
New in 2.1.0
Add support for comma separator in Transformations parameters.
New in 2.0.0
Breaking change: All previous parameters are now merged in a single line using syntax {xdt path} => {xml path}[ => {output path}].
Add support for multiple transformations.
Add Working folder parameter for root of relative paths.