[tahoe-lafs-trac-stream] [Tahoe-LAFS] #2929: Use CircleCI for some builds

[Tahoe-LAFS]

#2929: Use CircleCI for some builds
-------------------------+---------------------------
 Reporter:  exarkun      |          Owner:
     Type:  enhancement  |         Status:  new
 Priority:  normal       |      Milestone:  undecided
Component:  unknown      |        Version:  1.12.1
 Keywords:               |  Launchpad Bug:
-------------------------+---------------------------
 CircleCI is a CI-as-a-Service similar to TravisCI.  The Tahoe-LAFS project
 already uses TravisCI for some CI tasks.  However, Tahoe-LAFS uses (and
 maintains) a BuildBot deployment for some other CI tasks.

 BuildBot is used to run the test suite on the following platforms:

   * CentOS 7
   * Debian Jessie
   * Debian Stretch
   * Fedora 24
   * OpenBSD 5.9/amd64
   * OS X 10.13
   * OpenBSD 6.3/amd64
   * Ubuntu Xenial (16.04)
   * raspbian "jesse"/arm

 There are also BuildBot jobs for checking against pending upstream
 deprecations and building tarballs.

 TravisCI offers a couple or a few specific Linux distros for the build
 environment - mostly without overlap with the above list.  It does offer
 support for Docker and so it would be possible to bootstrap a test
 environment for some of the Linux distributions in the above list.  This
 would not help with the non-Linux platforms which cannot be run in a
 Docker container.

 However, CircleCI offers first-class support for custom Docker images
 which makes it easier to test with alternate Linux distros.  Unfortunately
 the cloud version doesn't offer support for custom VM images so non-Linux
 platforms are still out of luck.

 CircleCI also offers macOS support (with a usage limit).

 Compared to CircleCI, BuildBot is more effort to maintain.  Slaves present
 an _uninterestingly_ complex diversity of configurations (e.g., having tox
 2.3.9 instead of 2.7.0 really does not matter to Tahoe-LAFS as far as any
 user-facing functionality is concerned: it only makes it harder to manage
 the CI system).  Slaves are harder to update because each is a unique
 snowflake.

 Therefore, it would be beneficial to move the Linux-based BuildBot
 builders on to CircleCI.


 All of the Linux platform test-running builders can likely be moved to
 CircleCI and retired.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/2929>
Tahoe-LAFS <https://Tahoe-LAFS.org>
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