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nucleic/scripts/generate-appcast.sh
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#!/usr/bin/env bash
#
# Generate (or refresh) the Sparkle appcast for a channel from the DMGs in dist/.
#
# scripts/generate-appcast.sh {canary|beta|rc|stable}
#
# Sparkle's `generate_appcast` scans a folder of updates (our signed+notarized DMGs),
# writes an appcast XML describing them, and EdDSA-signs each entry with the private
# update key stored in your login keychain (created once by Sparkle's `generate_keys`
# — see signing/README.md). The enclosure (DMG) URLs are rewritten to NUCLEIC_FEED_BASE/<channel>/
# (the R2 host, channel-foldered for tidy download links), so the emitted appcast uploads as-is.
#
# Output: dist/appcast-<channel>.xml (upload it + the channel's DMG(s) to the R2 bucket
# whose download base is NUCLEIC_FEED_BASE — scripts/upload-r2.sh does this).
#
# Env:
# NUCLEIC_FEED_BASE download base for enclosure URLs
# (default: https://updates.nucleic.blakeslee.xyz)
# GENERATE_APPCAST path to the generate_appcast tool (default: auto-detect)
set -euo pipefail
CHANNEL="${1:?usage: generate-appcast.sh (canary|beta|rc|stable)}"
case "$CHANNEL" in
canary) SLUG="Nucleic-Canary" ;;
beta) SLUG="Nucleic-Beta" ;;
rc) SLUG="Nucleic-RC" ;;
stable) SLUG="Nucleic" ;;
*) echo "usage: $0 {canary|beta|rc|stable}" >&2; exit 2 ;;
esac
ROOT="$(cd "$(dirname "$0")/.." && pwd)"
FEED_BASE="${NUCLEIC_FEED_BASE:-https://updates.nucleic.blakeslee.xyz}"
# Locate generate_appcast: explicit env, then PATH, then the Sparkle SwiftPM artifact.
GEN="${GENERATE_APPCAST:-}"
[ -z "$GEN" ] && GEN="$(command -v generate_appcast || true)"
if [ -z "$GEN" ]; then
GEN="$(find "$ROOT/.build" -type f -name generate_appcast -perm -u+x 2>/dev/null | head -1 || true)"
fi
if [ -z "$GEN" ] || [ ! -x "$GEN" ]; then
cat >&2 <<EOF
generate-appcast: 'generate_appcast' tool not found.
It ships with Sparkle. Get it via either:
• a normal build that resolves Sparkle, then it's under .build/ (auto-detected), or
• the Sparkle release tarball / 'brew install --cask sparkle' (then set GENERATE_APPCAST).
EOF
exit 1
fi
# Stage just this channel's DMG(s) so generate_appcast doesn't mix channels into one feed.
STAGE="$ROOT/dist/appcast/$CHANNEL"
rm -rf "$STAGE"; mkdir -p "$STAGE"
shopt -s nullglob
found=0
for dmg in "$ROOT/dist/${SLUG}-"*.dmg; do
cp "$dmg" "$STAGE/"; found=$((found + 1))
done
shopt -u nullglob
[ "$found" -gt 0 ] || { echo "generate-appcast: no ${SLUG}-*.dmg in dist/ — build a release first" >&2; exit 1; }
echo "▸ Generating appcast for $CHANNEL from $found DMG(s)"
# Enclosure URLs land under the channel folder → updates.nucleic.blakeslee.xyz/<channel>/<dmg>
# (scripts/upload-r2.sh uploads the DMGs to that same key prefix). Trailing slash is required.
#
# generate_appcast mounts each DMG to read its version/build metadata, and Sparkle's compiled tool
# still does that through the deprecated `hdiutil attach -mountpoint -nobrowse` path — printing a
# cosmetic "…is deprecated, use diskutil image attach…" warning we can't silence at the source (it
# lives inside the Sparkle binary; fixing it is upstream's job). Filter just those hdiutil
# deprecation lines out of its stderr; all other output and the tool's exit status pass through
# unchanged. fd 3 carries stdout past the grep; `|| true` stops grep-filters-everything from
# tripping pipefail, while a real generate_appcast failure still propagates (pipefail).
{ "$GEN" --download-url-prefix "$FEED_BASE/$CHANNEL/" "$STAGE" 2>&1 1>&3 \
| { grep -vE '^hdiutil: WARNING:.*deprecated' >&2 || true; } ; } 3>&1
OUT="$ROOT/dist/appcast-$CHANNEL.xml"
# generate_appcast names its output after the app's embedded SUFeedURL basename — here
# appcast-<channel>.xml (SUFeedURL = .../appcast-<channel>.xml), NOT the bare appcast.xml it
# defaults to when no feed URL is embedded. Prefer that exact name, else take whichever single
# appcast XML it wrote, so this keeps working regardless of the feed-URL naming.
if [ -f "$STAGE/appcast-$CHANNEL.xml" ]; then
GENERATED="$STAGE/appcast-$CHANNEL.xml"
else
GENERATED="$(find "$STAGE" -maxdepth 1 -name 'appcast*.xml' | head -1)"
fi
[ -n "${GENERATED:-}" ] && [ -f "$GENERATED" ] || {
echo "generate-appcast: generate_appcast produced no appcast XML in $STAGE" >&2; exit 1; }
cp "$GENERATED" "$OUT"
echo "✓ $OUT"
echo " Upload to the R2 host '$FEED_BASE' (scripts/upload-r2.sh $CHANNEL):"
echo " • $(basename "$OUT")$FEED_BASE/appcast-$CHANNEL.xml"
echo " • each ${SLUG}-*.dmg referenced → $FEED_BASE/$CHANNEL/${SLUG}-<ver>.dmg"
echo " (the embedded SUFeedURL points the app at $FEED_BASE/appcast-$CHANNEL.xml)"