Phing: Reprompt after invalid database connection details - phing

Question

I'm writing a Phing task that needs to connect to a database using details supplied by the user.
I am able to prompt the user for the host/user/password/database and test the details using the PDOSQLExecTask.
What I don't know how to do is re-prompt the user to re-supply the details if they are found to be invalid, and keep re-prompting until they get it right.
The following block was my attempt, but it errors because Phing doesn't like when a task calls itself.
<target name="prompt-and-test-database-connection">
<trycatch>
<try>
<input propertyName="db.host" message="Database host" promptChar=":" />
<input propertyName="db.user" message="Database user" promptChar=":" />
<input propertyName="db.pass" message="Database password" promptChar=":" />
<input propertyName="db.name" message="Database name" promptChar=":" />
<echo message="Testing connection..." />
<pdosqlexec url="mysql:host=${db.host};dbname=${db.name}" userid="${db.user}" password="${db.pass}" onerror="continue">
USE `${db.name}`;
</pdosqlexec>
</try>
<catch>
<echo level="error">Invalid database connection details. Please try again.</echo>
<phingcall target="prompt-and-test-database-connection" />
</catch>
</trycatch>
</target>

Answer 1

You can use <retry> task. Since <retry> only accepts one nested task I extracted the connection in another task. The following works for me:
<target name="try-connection">
<retry retryCount="3">
<phingcall target="connection"/>
</retry>
</target>
<target name="connection">
<input propertyName="db.host" message="Database host" promptChar=":"/>
<input propertyName="db.user" message="Database user" promptChar=":"/>
<input propertyName="db.pass" message="Database password" promptChar=":"/>
<input propertyName="db.name" message="Database name" promptChar=":"/>
<echo message="Testing connection..."/>
<pdosqlexec url="mysql:host=${db.host};dbname=${db.name}"
userid="${db.user}"
password="${db.pass}"
onerror="continue">
USE `${db.name}`;
</pdosqlexec>
</target>