Puppet test and remove an array of files/folders - puppet

Question

I'm looking to make the following code work somehow, it seems if i do not test the files/folders first I end up with the error:
Error: Failed to apply catalog: Parameter path failed on
File[/opt/dynatrace-6.2]: File paths must be fully qualified, not
'["/opt/dynatrace-6.2", "/opt/dynatrace-5.6.0",
"/opt/rh/httpd24/root/etc/httpd/conf.d/dtload.conf",
"/opt/rh/httpd24/root/etc/httpd/conf.d/01_dtagent.conf"]' at
newrelic.pp:35
The pertinent parts
$dtdeps = [
"/opt/dynatrace-6.2",
"/opt/dynatrace-5.6.0",
"${httpd_root}/conf.d/dtload.conf",
"${httpd_root}/conf.d/01_dtagent.conf",
]
exec { "check_presence":
require => File[$dtdeps],
command => '/bin/true',
onlyif => "/usr/bin/test -e $dtdeps",
}
file { $dtdeps:
require => Exec["check_presence"],
path => $dtdeps,
ensure => absent,
recurse => true,
purge => true,
force => true,
} ## this is line 35 btw
exec { "stop_dt_agent":
command => "PID=$(ps ax |grep dtwsagent |grep -v grep |awk '{print$1}') ; [ ! -z $PID ] && kill -9 $PID",
provider => shell,
}
service { "httpd_restart" :
ensure => running,
enable => true,
restart => "/usr/sbin/apachectl configtest && /etc/init.d/httpd reload",
subscribe => Package["httpd"],
}

Answer 1

Your code looks basically correct, but you went overboard with your file resources:
file { $dtdeps:
require => Exec["check_presence"],
path => $dtdeps,
...
This does create all the file resources from your array (since you use an array for the resource title) but each single one of them will then try to use the same array as the path value, which does not make sense.
TL;DR remove the path parameter and it should Just Work.

Answer 2

You can actually simplify this down a lot. Puppet only runs the file removal if the files don't exist, so the check_presence exec is not required.
You can't give a path an array, but you can pass the title as an array and then the paths get automatically made.
$dtdeps = [
"/opt/dynatrace-6.2",
"/opt/dynatrace-5.6.0",
"${httpd_root}/conf.d/dtload.conf",
"${httpd_root}/conf.d/01_dtagent.conf",
]
file { $dtdeps:
ensure => absent,
recurse => true,
purge => true,
force => true,
}
exec { "stop_dt_agent":
command => '[ ! -z $PID ] && kill -9 $PID',
environment => ["PID=\$(ps ax |grep dtwsagent |grep -v grep |awk '{print$1}'))"],
provider => shell,
}
However, running the stop_dt_agent exec is a bit fragile. You could probably refactor this into a service resource instead:
service { 'dynatrace':
ensure => stopped,
provider => 'base',
stop => 'kill -TERM $(ps ax | grep \"dtwsagent\"|grep -v grep|awk '{print \$1}')',
status => "ps ax | grep "dtwsagent"",
}