Sage has two build bots.
Release Buildbot
The first builds entire tarballs (e.g. all the alphas) on a wide variety of machines, and can be found at http://build.sagemath.org/sage/ .
Patch Buildbot
The second pulls and applies patches from trac and can be found at http://sage.math.washington.edu:21100/ticket/ or from links on the individual trac tickets. This is still very much a work in progress, but the latest version of the code lives at http://sage.math.washington.edu/home/robertwb/buildbot/bot/ . Eventually this will get moved into Sage where it can be edited using the standard procedures and more widely deployed.
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ApplyFailed 5 BuildFailed 0 TestsFailed 5 PluginFailed 3 TestsPassed 9 Pending 0 NoPatch 0 Spkg 1
Usage
Patch Buildbot will usually be able to to determine which attachments for a given Trac ticket to apply; when in doubt click on the swirly blob to see it's plan of action. If it is unable to figure out what to do, tell Patch Buildbot explicitly which patches to apply by writing something like the following in any comment:
- Apply foo.patch, foo2.patch
This will "reset" the patch list at that point. Any subsequently added patches will get (semi-intellegently) appended to the list. The list of attachments which will be applied on the next run are listed at the top of the buildbot report page for that ticket (the page you get by clicking on the swirly round icon at the top of the ticket description).
To tell Patch Buildbot about any ticket dependencies, populate the dependencies field with the ticket numbers and/or minimal sage version.
Only the devel repository has branches, so the patchbot is unable to apply and try out patches to extcode/scripts/etc.
Hints and tricks
Detecting which patches to apply are both performed by string searches on each line of the ticket, and are case insensitive.