Publishing build artifacts and logs.
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There are many ways you can publish artifacts, both privately and publically.

Methods include:
Sending logs/artifacts through e-mail.
Uploading logs/artifacts to an FTP server.
Uploading logs/artifacts to an rsync server.
Uploading it through good ol HTTP.

Basically, if there's a commandline utility for it, you can use it in the
post/failed.sh scripts. Refer to variables.txt for how to use variables for
organizing artifacts.