Buildbot: add separate builders for master, lts and custom branches

This avoids too much rebuilding, and makes it easier to see which branches
are failing.

master.cfg

@@ -3,12 +3,6 @@
 
 # <pep8 compliant>
 
-# List of the branches being built automatically overnight
-NIGHT_SCHEDULE_BRANCHES = [
-    "master",
-     "blender-v2.83-release",
-]
-
 # Dictionary that the buildmaster pays attention to.
 c = BuildmasterConfig = {}
 
@@ -78,7 +72,7 @@ def schedule_force_build(name):
                 branch=forcesched.StringParameter(
                     name="branch",
                     label="Branch:",
-                    default="master",
+                    default="custom-branch-name-here",
                     regex=r'^[a-zA-Z0-9][A-Za-z0-9\._-]*$'),
                 # Hide revision. We don't want to allow anyone to overwrite the
                 # master build with an older version. Could be added back once we
@@ -99,23 +93,20 @@ def schedule_force_build(name):
         properties=[]))
 
 
-def schedule_nightly_build(name, hour, minute=0):
+def schedule_nightly_build(name, branch, hour, minute=0):
     """
     Creates scheduler for nightly builds for a given builder.
     """
-    for current_branch in NIGHT_SCHEDULE_BRANCHES:
-        scheduler_name = "nightly_" + name
-        if current_branch:
-            scheduler_name += ' ' + current_branch
-        c['schedulers'].append(timed.Nightly(
-            name=scheduler_name,
-            codebases={
-                "blender": {"repository": "",
-                            "branch": current_branch}},
-            branch=current_branch,
-            builderNames=[name],
-            hour=hour,
-            minute=minute))
+    scheduler_name = "nightly_" + name + ' ' + branch
+    c['schedulers'].append(timed.Nightly(
+        name=scheduler_name,
+        codebases={
+            "blender": {"repository": "",
+                        "branch": branch}},
+        branch=branch,
+        builderNames=[name],
+        hour=hour,
+        minute=minute))
 
 
 # BUILDERS
@@ -137,27 +128,30 @@ from buildbot.steps.master import MasterShellCommand
 # add builder utility
 
 c['builders'] = []
-buildernames = []
 
 
-def add_builder(c, name, factory, branch='',
+def add_builder(c, name, platforms, factory, branch='',
                 rsync=False, hour=3, minute=0):
-    workernames = []
+    for platform in platforms:
+        workernames = []
+        builder_name = name + '_' + platform
 
-    for slave in master_private.slaves:
-        if name in slave['builders']:
-            workernames.append(slave['name'])
+        for slave in master_private.slaves:
+            if platform == slave['platform']:
+                workernames.append(slave['name'])
+                builder_name = name + '_' + slave['platform_short']
 
-    if workernames:
-        f = factory(name, branch, rsync)
-        c['builders'].append(BuilderConfig(name=name,
-                                           workernames=workernames,
-                                           factory=f,
-                                           tags=['blender']))
-        buildernames.append(name)
+        if workernames:
+            f = factory(builder_name, branch, rsync)
+            c['builders'].append(BuilderConfig(name=builder_name,
+                                               workernames=workernames,
+                                               factory=f,
+                                               tags=['blender']))
 
-        schedule_nightly_build(name, hour, minute)
-        schedule_force_build(name)
+            if branch == '':
+                schedule_force_build(builder_name)
+            else:
+                schedule_nightly_build(builder_name, branch, hour, minute)
 
 
 # common steps
@@ -248,11 +242,24 @@ def generic_builder(id, branch='', rsync=False):
 
 # Builders
 
-add_builder(c, 'mac_x86_64_10_9_cmake', generic_builder, hour=1)
-add_builder(c, 'linux_glibc217_x86_64_cmake', generic_builder, hour=1)
-# NOTE: Visual Studio 2017 (vc15) is using libraries folder from
-# Visual Studio 2015 (vc14)
-add_builder(c, 'win64_cmake_vs2017', generic_builder, hour=1)
+add_builder(c,
+            'master',
+            ['windows', 'macOS_10_15', 'linux_centos7'],
+            generic_builder,
+            branch='master',
+            hour=1)
+add_builder(c,
+            'lts_283',
+            ['windows', 'macOS_10_9', 'linux_centos7'],
+            generic_builder,
+            branch='blender-v2.83-release',
+            hour=1)
+add_builder(c,
+            'custom_branch',
+            ['windows', 'macOS_10_15', 'linux_centos7'],
+            generic_builder,
+            branch='',
+            hour=1)
 
 # HORIZONS
 from datetime import timedelta

master_private_template.py

@@ -1,5 +1,18 @@
 slaves = [
-    {'name': 'linux_glibc219_x86_64_chroot',
-     'password': 'barbarianna',
-     'builders': ['linux_glibc217_x86_64_cmake']}
+    {'name': 'linux_something_something',
+     'password': 'something',
+     'platform': 'linux_centos7',
+     'platform_short': 'linux'}
+    {'name': 'macOS_10_15_something_something',
+     'password': 'something',
+     'platform': 'macOS_10_15',
+     'platform_short': 'macos'}
+    {'name': 'macOS_10_9_something_something',
+     'password': 'something',
+     'platform': 'macOS_10_9',
+     'platform_short': 'macos'}
+    {'name': 'windows_something_something',
+     'password': 'something',
+     'platform': 'windows',
+     'platform_short': 'windows'}
 ]