refactor ensure_packages to switch version of installed packages - puppet

Question

I am successfully installing several PHP modules by version with puppet on Debian linux like this:
$php_version = '7.3'
ensure_packages([
"php$php_version-xml",
"php$php_version-zip",
"php$php_version-curl",
"php$php_version-mbstring",
"libapache2-mod-php$php_version",
],
{
'ensure' => 'present',
}
)
now I want to prepare for an update from PHP 7.3 to 7.4. This basically works, but the 7.3 packages stay installed. I would like to adapt the code to remove the old packages. I am looking for a way to reuse the list of packages of modules for uninstalling.
I am thinking of a signature like this
class profile::software::apache (
$php_version = '7.4',
$php_remove = ['7.0‘, ‘7.3'],
#...
) {
$myPackages = [
"php$php_version-xml",
"php$php_version-zip",
"php$php_version-curl",
"php$php_version-mbstring",
"libapache2-mod-php$php_version",
]
ensure_packages($myPackages,
{
'ensure' => 'present',
}
)
$php_remove.each | String $php_version | {
ensure_packages($myPackages,
{
'ensure' => 'absent',
}
)
}
}
Is there a way to solve this?
thx

Answer 1

I was able to solve this by using iteration functions of puppet.
From the two parameters I build a hash with keys of versions to work on and values to either install or remove the given version.
Now I can iterate over this hash with each, reusing the structure:
class profile::software::apache (
$php_version = '7.4',
$php_remove = ['7.0‘, ‘7.3'],
#...
) {
# build a hash of PHP Versions with a value of either present or absent
# and iterate over it with each
$phpInstallHash = { $php_version => 'present' }
#notify { "Value of phpRemove: ${php_remove}": }
if $php_remove {
# We have the array, use the map function to build remove hash
$phpRemoveHash = $php_remove.map |$version| {
{ $version => 'absent' }
}
$phpFullHash = $phpInstallHash + $phpRemoveHash
} else {
$phpFullHash = $phpInstallHash
}
#notify { "phpHash to iterate over to install/uninstall: ${phpFullHash}": }
#iterate over the result installing/uninstalling
$phpFullHash.each | $php_version, $ensure_value | {
ensure_packages([
"php$php_version-xml",
"php$php_version-zip",
"php$php_version-curl",
"php$php_version-mbstring",
"libapache2-mod-php$php_version",
],
{
'ensure' => $ensure_value,
require => [Class['apt::update'],
Apt::Source['source_php_sury'],
],
notify => Class['apache::service'],
}
)
}
}
hth