mach try & partitioned try jobs

.github/workflows/main.yml

@@ -35,6 +35,7 @@ jobs:
               });
 
   build-win:
+    if: contains(fromJSON('["auto", "try", "try-windows"]'), github.ref_name)
     name: Build (Windows)
     runs-on: windows-2019
     needs: ["decision"]
@@ -60,6 +61,7 @@ jobs:
         run: python mach smoketest --angle
 
   build-mac:
+    if: contains(fromJSON('["auto", "try", "try-mac"]'), github.ref_name)
     name: Build (macOS)
     runs-on: macos-12
     needs: ["decision"]
@@ -157,6 +159,7 @@ jobs:
   #           filtered-wpt-summary.${{ matrix.chunk_id }}.log
 
   build-linux:
+    if: contains(fromJSON('["auto", "try", "try-linux", "try-wpt"]'), github.ref_name)
     name: Build (Linux)
     runs-on: ubuntu-20.04
     needs: ["decision"]
@@ -183,6 +186,7 @@ jobs:
           path: target.tar.gz
 
   linux-wpt:
+    if: contains(fromJSON('["auto", "try", "try-wpt"]'), github.ref_name)
     name: Linux WPT Tests
     runs-on: ubuntu-20.04
     needs: ["build-linux"]
@@ -241,7 +245,7 @@ jobs:
   report_test_results:
     name: Reporting test results
     runs-on: ubuntu-latest
-    if: always()
+    if: "!cancelled() && success('build-linux') && contains(fromJSON('[\"auto\", \"try\", \"try-wpt\"]'), github.ref_name)"
     needs:
       - "linux-wpt"
     steps:
@@ -269,16 +273,20 @@ jobs:
   build_result:
     name: homu build finished
     runs-on: ubuntu-latest
+    if: always()
+    # needs all build to detect cancellation
     needs:
+      - "decision"
       - "build-win"
       - "build-mac"
+      - "build-linux"
       - "linux-wpt"
       # - "mac-wpt"
 
     steps:
       - name: Mark the job as successful
         run: exit 0
-        if: success()
+        if: "!contains(join(needs.*.result, ','), 'failure') && !contains(join(needs.*.result, ','), 'cancelled')"
       - name: Mark the job as unsuccessful
         run: exit 1
-        if: "!success()"
+        if: contains(join(needs.*.result, ','), 'failure') || contains(join(needs.*.result, ','), 'cancelled')

python/servo/devenv_commands.py

@@ -349,3 +349,41 @@ class MachCommands(CommandBase):
             "--verbose",
         ], env=env)
         return p.wait()
+
+    @Command('try',
+             description='Runs try jobs by force pushing to personal fork try branches',
+             category='devenv')
+    @CommandArgument(
+        'jobs', default=["try"], nargs='...',
+        help="Name(s) of job(s) (ex: try, linux, mac, windows, wpt)")
+    def try_jobs(self, jobs):
+        branches = []
+        # we validate branches because force pushing is destructive
+        VALID_TRY_BRACHES = ["try", "try-linux", "try-mac", "try-windows", "try-wpt"]
+        for job in jobs:
+            # branches must start with try-
+            if "try" not in job:
+                job = "try-" + job
+            if job not in VALID_TRY_BRACHES:
+                print(job + " job doesn't exist")
+                return -1
+            branches.append(job)
+        remote = "origin"
+        if "servo/servo" in subprocess.check_output(["git", "config", "--get", "remote.origin.url"]).decode():
+            # if we have servo/servo for origin check try remote
+            try:
+                if "servo/servo" in subprocess.check_output(["git", "config", "--get", "remote.try.url"]).decode():
+                    # User has servo/servo for try remote
+                    print("You should not use servo/servo for try remote!")
+                    return -1
+                else:
+                    remote = "try"
+            except subprocess.CalledProcessError:
+                print("It looks like you are patching in upstream servo.")
+                print("Set try remote to your personal fork with `git remote add try https://github.com/user/servo`")
+                return -1
+        for b in branches:
+            res = call(["git", "push", remote, "--force", f"HEAD:{b}"], env=self.build_env())
+            if res != 0:
+                return res
+        return 0