Issue #13284 has been updated by Arnoud de Jonge.

This clears the environment for the command if no custom environment is given. 
This seems to cause the problems described in #16262. I've added a possible fix 
in that ticket.
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Bug #13284: MacPorts provider needs to set HOME while running `port` command.
https://projects.puppetlabs.com/issues/13284#change-76518

Author: Daniel Pittman
Status: Closed
Priority: Normal
Assignee: Andrew  Parker
Category: executables
Target version: 3.0.0
Affected Puppet version: development
Keywords: 
Branch: https://github.com/puppetlabs/puppet/pull/606


In [commit e44a8abd7dc7b2cac4c05eb7a50b53bdd71a1cbc][commit] the `HOME`, 
`USER`, and `LOGNAME` environment variables were set to be removed by default 
during the execution of external commands.

This is generally a good idea, because those are inherited by default from the 
user who Puppet starts running as, and can be quite misleading if we change 
user ID - as we commonly do to execute external commands, and on the master.

One limitation of this is that the MacPorts provider needs to set HOME to 
something during invocation, or we run into the error:

    1) Package provider macports should be able to get a list of existing 
packages
     Failure/Error: provider.instances.each do |package|
     Puppet::ExecutionFailure:
       Execution of '/opt/local/bin/port -q installed' returned 1: usage: cut 
-b list [-n] [file ...]
              cut -c list [file ...]
              cut -f list [-s] [-d delim] [file ...]
           while executing
       "exec dscl -q . -read /Users/[exec id -un] NFSHomeDirectory | cut -d ' ' 
-f 2"
           (procedure "mportinit" line 95)
           invoked from within
       "mportinit ui_options global_options global_variations"
       Error: /opt/local/bin/port: Failed to initialize MacPorts, usage: cut -b 
list [-n] [file ...]
              cut -c list [file ...]
              cut -f list [-s] [-d delim] [file ...]
     # ./lib/puppet/util/execution.rb:135:in `execute'
     # ./lib/puppet/util.rb:476:in `execute'
     # ./lib/puppet/provider.rb:122:in `port'
     # ./lib/puppet/provider/package/macports.rb:49:in `instances'
     # ./spec/integration/provider/package_spec.rb:37

Setting `HOME` to `/opt/local` is a good choice, especially since the MacPorts 
provider only supports the default install location by design.

Unfortunately, the `commands` mechanism that is part of the provider interface 
doesn't allow access to the environment - which it should, since this will not 
be the final command to require that treatment.


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