Argument quoting prevents expansion of glob expressions and environment variables on macOS

[Johennes]

On macOS the following configuration results in an error.

<plugins>
  <plugin>
    <groupId>org.codehaus.mojo</groupId>
    <artifactId>exec-maven-plugin</artifactId>
    <version>3.5.0</version>
    <configuration>
      <skip>${skip.saving.reports}</skip>
    </configuration>
    <executions>
      <execution>
        <id>save_reports</id>
        <phase>post-integration-test</phase>
        <goals>
          <goal>exec</goal>
        </goals>
        <configuration>
          <executable>ls</executable>
          <arguments>
            <argument>src/*</argument>
          </arguments>
          <outputFile>out.log</outputFile>
        </configuration>
      </execution>
    </executions>
  </plugin>
</plugins>

$ cat out.log
ls: src/*: No such file or directory

This is despite the fact that the directory exists and is non-empty on my system:

$ ls src/*
src/main:
java		resources

src/test:
resources

To further illustrate the problem, trying to echo $SHELL will output "$SHELL" rather than expanding the variable.

<goals>
  <goal>exec</goal>
</goals>
<configuration>
  <executable>echo</executable>
  <arguments>
    <argument>$SHELL</argument>
  </arguments>
  <outputFile>out.log</outputFile>
</configuration>

$ cat out.log
$SHELL

I haven't checked any of the plugin's code but my suspicion is that the arguments are quoted which prevents the shell from expanding them.