Deploy OS X and Debian packages from Travis-CI

Here's the Travis-CI framework for cross platform releases (first proposed in !352 (closed)). It can be improved, but I don't plan to work more on it. It's "good enough" for release purposes.

For configuration, Deployer uses Travis environment variables. For full documentation, see:

https://wiki.srb2.org/wiki/User:Digiku/Cross-platform_deployment

Deployer is triggered only under these conditions:

• DPL_ENABLED=1 is set AND a branch is pushed that contains the word deployer
• DPL_ENABLED=1 is set AND DPL_TAG_ENABLED=1 is set AND a release tag is pushed
• Pull requests will never trigger Deployer

Deployer defines release buildbots separately from test buildbots:

• When Deployer is not triggered: the test buildbots remain ON and release buildbots are toggled OFF.
• For deployer branch builds when DPL_ENABLED=1: the test buildbots remain ON unless DPL_TERMINATE_TESTS=1 is set, then they are toggled OFF. Release buildbots are toggled ON.
• For release tags when DPL_TAG_ENABLED=1: the test buildbots always remain ON and release buildbots are toggled ON.

Features

What it does currently:

• Build OS X DMG installer via CMake and upload to non-secure FTP
• Build Debian source packages via dpkg and upload to Launchpad via dput

What was not tested (and may not work):

• Upload to SFTP or FTPS
• Build Debian binary packages

What would be nice for the future:

• Build Debian packages via CMake, and possibly scrap the debian-template scripts
• Build Windows packages via CMake

.travis.yml changes

• matrix
  • if conditions added to every buildbot to toggle them ON or OFF if Deployer is triggered
  • Release buildbots are added
• before_install
  • deployer_defaults.sh defines some defaults used in the main travis script, including asset download links and md5 hash files.
  • deployer.sh evaluates whether Depoyer is triggered, and whether to terminate the buildbot early if it's a deployer branch and the optional filter conditions are not met (see documentation)
• install
  • OS X: sdl2_mixer --with-flac --with-mpg123 is installed. The other packages are the same. Both sdl2 and sdl2_mixer are the latest versions on Homebrew.
• before_script:
  • Asset download will only trigger if the server modified date is newer than the cache modified date
  • Asset download path changed to GitHub Releases hosting

Other changes

• Some CMAKE variables are made configurable (CACHE)
• Debian scripts are template-ized -- outside of Travis, they can be filled in by running the debian_template.sh script, using defaults or environment variables from deployer_defaults.sh

Buildbot results

• Deployer is not triggered: https://travis-ci.org/mazmazz/SRB2/builds/474666618
• Deployer is triggered: https://travis-ci.org/mazmazz/SRB2/builds/475702146

changed title from Travis deployer to Deploy OS X and Debian packages from Travis-CI

@Alam let me know if you don't like the .travis.yml changes.

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• 97f8448b - Don't terminate in after_success because it halts the log abruptly

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• 0834dbc1 - * Add homebrew tap mazmazz/srb2
• 72ff794d - OS X set CFLAGS+="-march=core2" for compatible binaries with old Macs

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• 9ef7d2e6 - OS X set CFLAGS+="-march=core2" for compatible binaries with old Macs

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• 17cde328 - Use standard OSX brew bottles to speed up test buildbots

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• 20879f1f - Remove zlib from release brew packages

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• 2592f42a - Remove unnecessary version info call

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Based on us trying this out for kart. My main feedback right now is that it feels like the Asset package should target the "all" architecture for Linux, as I don't believe there's any reason for it to only have a 64-bit version on the PPA and not let people install the assets when they want a 32-bit version.

Seems weird to target a specific architecture for the assets, when it's not even architecture dependent.

Actually, that was probably false, I believe it DOES already build an all package. I'll be able to look into things better later.

added 81 commits

• 2592f42a...addf2bb3 - 80 commits from branch master
• 3c08ee13 - Merge branch 'master' into travis-deployer

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merged

mentioned in commit 3edf73f1