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Executing a script from Maven 3 using exec plugin - gets blocked
echo "Uploading the site.."
lftp -u ${username},${password} sftp://${host} <<EOF
mirror -R --delete-first $sitedir $remotedir
echo "Exiting from lftp.."
bye
EOF
echo "Terminating script execution.."

<distributionManagement>
 <!-- Generate the site locally, then it'll be uploaded to the server -->
 <!-- Children will append their artifact ID to the base url  -->
 <site>
  <id>project-name</id>
  <name>Project Name</name>
  <url>file://${env.HOME}/testsite/</url>
 </site>
</distributionManagement>
...
<build>
<pluginManagement>
 <plugins>
  <plugin>
   <groupId>org.codehaus.mojo</groupId>
   <artifactId>exec-maven-plugin</artifactId>
   <version>1.2.1</version>
  </plugin>
 </plugins>
</pluginManagement>
<plugins>
 <plugin>
  <groupId>org.apache.maven.plugins</groupId>
  <artifactId>maven-site-plugin</artifactId>
  <version>3.0</version>
  <configuration>
    ...
 </plugin>
 <plugin>
  <groupId>org.codehaus.mojo</groupId>
  <artifactId>exec-maven-plugin</artifactId>
  <inherited>false</inherited>
  <executions>
   <execution>
    <id>sh</id>
    <phase>site-deploy</phase>
    <goals>
     <goal>exec</goal>
    </goals>
    <configuration>
     <executable>sh</executable>
     <arguments>
      <argument>publish-site.sh</argument>
      <argument>${localsitedir}</argument>
      ...
     </arguments>
    </configuration>
   </execution>
  </executions>
 </plugin>
</plugins>
</build>

<build>
 <plugin>
  <groupId>org.codehaus.mojo</groupId>
  <artifactId>exec-maven-plugin</artifactId>
  <executions>
   <execution>
    <id>sh</id>
    <phase>site-deploy</phase>
    <goals>
     <goal>exec</goal>
    </goals>
    <configuration>
     <executable>sh</executable>
     <arguments>
      <argument>../parent/publish-site.sh</argument>
      <argument>${localsitedir}/child</argument>
      ...
     </arguments>
    </configuration>
   </execution>
  </executions>
 </plugin>
</build>