Render photos individually, optimize gallery images, and prune old releases

scripts/deploy-site.sh

@@ -35,7 +35,7 @@ ssh "${ssh_options[@]}" "$target" "mkdir -p '$release'"
 # Checksums and hard links avoid retransmitting existing photos on every build.
 printf -v transport 'ssh -i %q -p %q -o BatchMode=yes -o IdentitiesOnly=yes -o StrictHostKeyChecking=yes -o UserKnownHostsFile=%q' \
     "$credentials/key" "$DEPLOY_PORT" "$credentials/known_hosts"
-rsync -azc --delete --link-dest="$DEPLOY_PATH/current/" -e "$transport" _site/ "$target:$release/"
+rsync -azc --no-times --delete --link-dest="$DEPLOY_PATH/current/" -e "$transport" _site/ "$target:$release/"
 ssh "${ssh_options[@]}" "$target" "bash -s -- '$DEPLOY_PATH' '$release' '$GITHUB_RUN_NUMBER'" <<'REMOTE'
 set -euo pipefail
 destination=$1
@@ -58,5 +58,22 @@ chmod -R a+rX "$release"
 temporary="$destination/.current-$run-$$"
 ln -s "releases/$(basename "$release")" "$temporary"
 mv -Tf "$temporary" "$destination/current"
+python3 - "$destination" "$run" <<'PRUNE'
+from pathlib import Path
+import re
+import shutil
+import sys
+
+root = Path(sys.argv[1])
+current = (root / 'current').resolve(strict=True)
+run = int(sys.argv[2])
+for old in (root / 'releases').iterdir():
+    if not old.is_dir() or old.is_symlink() or old.resolve() == current:
+        continue
+    match = re.fullmatch(r'(\d+)(?:-\d+-[a-f0-9]{40})?', old.name)
+    # A higher-numbered release may still be transferring; it will prune us later.
+    if match and int(match.group(1)) <= run:
+        shutil.rmtree(old)
+PRUNE
 echo "Deployed $release"
 REMOTE