No idea what I did or whether it works

.drone.yml

@@ -1,6 +1,6 @@
 kind: pipeline
 type: docker
-name: upstreaming
+name: Upstreaming
 
 steps:
   - name: "Sync upstream to local"
@@ -11,11 +11,13 @@ steps:
         - promote
       target:
         - upstream
+      branch:
+        - core
     environment:
       GITEA_SSH_KEY:
         from_secret: gitea_ssh_key
     commands:
-      - sh .drone/setup_ssh.sh
+      - ./.drone/setup_ssh.sh
       - git fetch
       - git checkout devos
       - git remote add devos git@git.b12f.io:pub-solar/devos
@@ -24,7 +26,7 @@ steps:
       - git merge -X theirs devos/core
       - git push origin devos
 
-  - name: "Sync core with upstream"
+  - name: "Sync branch with upstream"
     image: alpine/git
     when:
       status:
@@ -34,39 +36,12 @@ steps:
         - promote
       target:
         - upstream
-    depends_on:
-      - "Sync upstream to local"
     environment:
       GITEA_SSH_KEY:
         from_secret: gitea_ssh_key
     commands:
-      - git checkout feat/upstreaming
-      - sh .drone/setup_ssh.sh
-      - git fetch --all
-      - git checkout --track origin/core
-      - git merge origin/devos
-      - git push origin core
-
-  - name: "Notify success"
-    image: plugins/matrix
-    when:
-      status:
-        - success
-      event:
-        - cron
-        - promote
-      target:
-        - upstream
-    depends_on:
-      - "Sync core with upstream"
-    settings:
-      homeserver: https://matrix.pub.solar
-      roomid: dfQBqwkhIzrFjMSsxy:pub.solar
-      username:
-        from_secret: matrix_username
-      password:
-        from_secret: matrix_password
-      template: Upstreaming devos into core succeeded.
+      - ./.drone/setup_ssh.sh
+      - ./.drone/upstream-branch.sh
 
   - name: "Open pull request for failed merge"
     image: nixery.dev/shell/tea
@@ -78,8 +53,8 @@ steps:
         - promote
       target:
         - upstream
-    depends_on:
-      - "Sync core with upstream"
+      branch:
+        - core
     environment:
       TEA_CONFIG:
         from_secret: tea_config
@@ -88,18 +63,14 @@ steps:
       - echo "$$TEA_CONFIG" > ~/.config/tea/config.yml
       - tea pulls create --base core --head devos
 
-  - name: "Notify failure"
+  - name: "Notify matrix"
     image: plugins/matrix
     when:
-      status:
-        - success
       event:
         - cron
         - promote
       target:
         - upstream
-    depends_on:
-      - "Open pull request for failed merge"
     settings:
       homeserver: https://matrix.pub.solar
       roomid: dfQBqwkhIzrFjMSsxy:pub.solar
@@ -107,4 +78,4 @@ steps:
         from_secret: matrix_username
       password:
         from_secret: matrix_password
-      template: Upstreaming devos into core failed. A pull request has been created https://git.b12f.io/pub-solar/os/pulls
+      template: "Upstreaming {{ build.status }} [{{ build.branch }}#{{ truncate build.commit 8 }}]({{ build.link }}) by {{ build.author }}. [Pull requests](https://git.b12f.io/pub-solar/os/pulls)"

.drone/setup_ssh.sh

@@ -1,4 +1,7 @@
-#!/bin/bash
+#!/usr/bin/env sh
+
+set -e
+
 # Setup ssh inside container
 mkdir -p ~/.ssh
 echo "$GITEA_SSH_KEY" > ~/.ssh/id_rsa

.drone/upstream-branch.sh

@@ -0,0 +1,12 @@
+#!/usr/bin/env sh
+
+set -e
+set -u
+
+LOCAL="$DRONE_BRANCH"
+[ "$LOCAL" = "core" ] && UPSTREAM=origin/devos || UPSTREAM=origin/core
+
+git fetch --all
+git checkout --track origin/"$LOCAL"
+git merge "$UPSTREAM"
+git push origin "$LOCAL"