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http://jira.codehaus.org/browse/MRELEASE-263?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=153359#action_153359
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Sean Flanigan commented on MRELEASE-263:
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Never mind, upon closer investigation, mvn release:prepare doesn't even seem to
use StreamPumper, it has its own RawStreamPumper. My problem was caused by a
shell alias I had forgotten about which passes mvn output through awk (which
buffers by lines).
> Interactive plugins cannot work in forked executions
> ----------------------------------------------------
>
> Key: MRELEASE-263
> URL: http://jira.codehaus.org/browse/MRELEASE-263
> Project: Maven 2.x Release Plugin
> Issue Type: Bug
> Affects Versions: 2.0-beta-6
> Reporter: Daniel Kulp
> Priority: Critical
>
> I was looking into the problems with the GPG plugin when run from the
> release plugin and the problems seem to entirely be problems of the
> release plugin and Plexus utils. They are showing up in the gpg
> plugin, but any plugin that tries to do anything interactively would
> most likely run into the same problems.
> Issues:
> 1) System.in - the release manager doesn't feed anything from System.in
> into the forked process. I tried adding System.in to the
> CommandLineUtils.executeCommandLine call, but that just causes a hang.
> CommandLineUtils will wait until the "in" stream is completely consumed
> (returns -1) before returning. With System.in, that never will happen.
> 2) Buffered(line style) out - the StreamPumpers use
> BufferedInputStream.readLine() to pump from one stream to the other.
> This won't work. Anything that does something (like the release plugin
> itself) that prompts and then waits for a response on the same line will
> appear to just "hang" as the prompt will never make it to the screen.
> Basically, those two issues completely prevent us from being able to
> un-hard code GPG passphrases from build scripts and such. (unless you
> set gpg.useagent to true and use an agent)
> In anycase, MGPG-9 is really a release plugin bug although part of it is
> due to plexus-utils not providing the support it would need to work
> properly. Most likely, we'll need to add a method in CommandLineUtils
> that would just take the raw streams (in/out/err) and do straight byte
> copy reads without the line buffering. (and once the process
> completely, stop pumping the in stream) (of course, that would then
> require another plexus-utils release and then the release plugin would
> only work with Maven 2.0.6+ with the utils shaded, but that may be
> minor) I'll poke around more and see if I can come up with something.
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