ci: generate appcast, upload it

dist/macos/update_appcast_tip.py

@@ -0,0 +1,66 @@
+"""
+This script is used to update the appcast.xml file for Ghostty releases.
+The script is currently hardcoded to only work for tip releases and therefore
+doesn't have rich release notes, hardcodes the URL to the tip bucket, etc.
+
+This expects the following files in the current directory:
+    - sign_update.txt - contains the output from "sign_update" in the Sparkle
+      framework for the current build.
+    - appcast.xml - the existing appcast file.
+
+And the following environment variables to be set:
+    - GHOSTTY_BUILD - the build number
+    - GHOSTTY_COMMIT - the commit hash
+
+The script will output a new appcast file called appcast_new.xml.
+"""
+
+import os
+import xml.etree.ElementTree as ET
+from datetime import datetime, timezone
+
+now = datetime.now(timezone.utc)
+build = os.environ["GHOSTTY_BUILD"]
+commit = os.environ["GHOSTTY_COMMIT"]
+
+# Read our sign_update output
+with open("sign_update.txt", "r") as f:
+    # format is a=b b=c etc. create a map of this. values may contain equal
+    # signs, so we can't just split on equal signs.
+    attrs = {}
+    for pair in f.read().split(" "):
+        key, value = pair.split("=", 1)
+        value = value.strip()
+        if value[0] == '"':
+            value = value[1:-1]
+        attrs[key] = value
+
+# Open our existing appcast and find the channel element. This is where
+# we'll add our new item.
+et = ET.parse('appcast.xml')
+channel = et.find("channel")
+
+# Create the item using some absoultely terrible XML manipulation.
+item = ET.SubElement(channel, "item")
+elem = ET.SubElement(item, "title")
+elem.text = f"Build {build}"
+elem = ET.SubElement(item, "pubDate")
+elem.text = now.strftime("%a, %d %b %Y %H:%M:%S %z")
+elem = ET.SubElement(item, "sparkle:version")
+elem.text = build
+elem = ET.SubElement(item, "sparkle:shortVersionString")
+elem.text = commit
+elem = ET.SubElement(item, "sparkle:minimumSystemVersion")
+elem.text = "12.0.0"
+elem = ET.SubElement(item, "description")
+elem.text = f"""
+<p>Automated build from commit <pre>{commit}</pre>.</p>
+"""
+elem = ET.SubElement(item, "enclosure")
+elem.set("url", f"https://tip.files.ghostty.dev/{build}/ghostty-macos-universal.zip")
+elem.set("type", "application/octet-stream")
+for key, value in attrs.items():
+    elem.set(key, value)
+
+# Output the new appcast.
+et.write("appcast_new.xml")