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It's in the build file.  I just failed to copy it to my post.  That is NOT the problem.

The channel is "simulatoralive/bigblockengine:win-linux-osx-Alpha".  That should have been on the end of the command string you requested.

As stated in my first post, my build script worked just fine under Windows 7, with the --if-changed switch still in place.  Under Linux, it does NOT work, because butler chokes and dies on an empty directory.  Please, could someone look at fixing this bug?  Additionally, I would appreciate it if the --dry-run switch were modified to actually do the complete file comparisons.  It does not currently do this.

I would have made a bug report through butler's github page, save for the fact that I flat out refuse to ever use github so long as Microsoft is the owner.  I posted here as an alternative.

Dark Dimension, before you continue to nit-pick at what I'm saying here on this forum, look at my build script; I'm posting a copy in a code block at the end of this post (this is not the complete version and has everything stripped out of it except the variables and the publish targets; if you insist on seeing the complete version go download the source archive for my game and look for the file "bigblockengine/build.xml" in that archive).  This Ant build script is what actually does the job.  The publish targets are at the very end.  The variables are all clearly laid out at the beginning (each is a "property" XML tag, which for some unknown reason the forum has expended into start and finish tags; not how it should be, but whatever, the forum software is a control freak about code blocks) and are all surrounded by curly braces, preceded by a dollar sign, in any text where they get substituted in.  The build target you'd want to look at specifically is publish-test.  It's using a different channel, but that's a hidden channel I setup to further test this bug.

In Ant scripts, the "exec" task calls another program, in this case, butler, then add's the "line" attributes from any nested "arg" tags on as the parameters, after it has parsed variables out of them.

As you can see, the ONLY differences between the "publish" and "publish-test" targets is the --if-changed switch and the channel.  The one with --if-changed, which is the old way I was doing things, chokes and dies.

To make myself very plain, I posted here to get the developer's attention.  I believe that would be Amos, yes?  May I please have his attention on this?

<project name="bigblockengine" default="jar" basedir=".">
  <!-- set global properties for this build -->
  <property name="name" value="${ant.project.name}"></property>
  <property name="name-verbose" value="Big Block Engine"></property>
  <property name="ver-major" value="0"></property>
  <property name="ver-minor" value="23"></property>
  <property name="ver-bug" value="2"></property>
  <property name="ver-flag" value="Alpha"></property>
  <property name="version" value="${ver-major}.${ver-minor}.${ver-bug} ${ver-flag}"></property>
  <property name="version2" value="${ver-major}.${ver-minor}.${ver-bug}-${ver-flag}"></property>
  <property name="main-class" value="net.sf.simulatoralive.blockgame.GameLoader"></property>
  <property name="doc-packages" value="*"></property>
  <property name="doc-title" value="${name-verbose} ${version}"></property>
  <property name="source-version" value="1.8"></property>
  <property name="target-version" value="1.8"></property>
  <!-- Files/directories for this build -->
  <property name="doc-root" location="doc"></property>
  <property name="doc" location="${doc-root}/${name}"></property>
  <property name="src-root" location="src"></property>
  <property name="src" location="${src-root}/${name}"></property>
  <property name="src-bootstrap" location="${src-root}/bootstrap"></property>
  <property name="bootstrap-zip" location="mods-zip/bootstrap.game.zip"></property>
  <property name="temp-dir" location="classes"></property>
  <property name="build" location="${temp-dir}/${name}"></property>
  <property name="dist" location="."></property>
  <property name="dist-jar" location="${dist}/${name}.jar"></property>
  <property name="dist-tar" location="${name}-${version2}.tar.bz2"></property>
  <property name="dist-tar-bin" location="${name}-${version2}-bin.tar.bz2"></property>
  <property name="dist-zip-bin" location="${name}-${version2}-bin.zip"></property>
  <property name="dist-tar-src" location="${name}-${version2}-src.tar.bz2"></property>
  <property name="dist-zip-src" location="${name}-${version2}-src.zip"></property>
  <!-- Classpath for compilation -->
  <property name="classpath" value="lib/hierarchy.jar;lib/jogl/jogl-all.jar;lib/jogl/gluegen-rt.jar;lib/substance.jar;lib/trident.jar;lib/svg-salamander.jar;lib/dyn4j.jar"></property>
  <!-- Jar file classpath is space separated -->
  <property name="jar-classpath" value="lib/hierarchy.jar lib/jogl/jogl-all.jar lib/jogl/gluegen-rt.jar lib/substance.jar lib/trident.jar lib/dyn4j.jar"></property>
  <property name="butler-bin-channel" value="simulatoralive/bigblockengine:win-linux-osx-${ver-flag}"></property>
  <property name="butler-src-channel" value="simulatoralive/bigblockengine:source"></property>
  <property name="butler-bin-channel-test" value="simulatoralive/bigblockengine:test-${ver-flag}"></property>
  <property name="butler-src-channel-test" value="simulatoralive/bigblockengine:test-source"></property>
  <property name="butler-switches" value="--userversion=${version2} --noprogress"></property>
  
  <target name="publish" depends="dist-bin,dist-src">
    <!-- Push the binary build using itch.io Butler command.
         Hopefully this is cross-platform enough to work. -->
    <echo message="Publishing binary build..." level="info"></echo>
    <exec executable="butler" failonerror="true">
      <arg line="push ${butler-switches} ${dist-zip-bin} ${butler-bin-channel}"></arg>
    </exec>
    <echo message="Binary build published." level="info"></echo>
    
    <!-- Push the sources using itch.io Butler command.
         Hopefully this is cross-platform enough to work. -->
    <echo message="Publishing sources..." level="info"></echo>
    <exec executable="butler" failonerror="true">
      <arg line="push ${butler-switches} ${dist-zip-src} ${butler-src-channel}"></arg>
    </exec>
    <echo message="Sources published." level="info"></echo>
  </target>
  
  <target name="publish-test" depends="dist-bin,dist-src">
    <!-- Push the binary build using itch.io Butler command.
         Hopefully this is cross-platform enough to work. -->
    <echo message="Publishing binary build..." level="info"></echo>
    <exec executable="butler" failonerror="true">
      <arg line="push --if-changed ${butler-switches} ${dist-zip-bin} ${butler-bin-channel-test}"></arg>
    </exec>
    <echo message="Binary build published." level="info"></echo>
    
    <!-- Push the sources using itch.io Butler command.
         Hopefully this is cross-platform enough to work. -->
    <echo message="Publishing sources..." level="info"></echo>
    <exec executable="butler" failonerror="true">
      <arg line="push --if-changed ${butler-switches} ${dist-zip-src} ${butler-src-channel-test}"></arg>
    </exec>
    <echo message="Sources published." level="info"></echo>
  </target>
  
</project>