Resolve Gitea release downloads

install.sh

@@ -204,6 +204,24 @@ release_download_url() {
   fi
 }
 
+release_latest_tag_download_url() {
+  if [ -n "$binary_url" ] || [ -n "$binary_base" ] || [ "$binary_version" != "latest" ] || [ -z "$repo" ]; then
+    return 1
+  fi
+  web_base="$(repo_web_base "$repo")" || return 1
+  latest_url="$(curl -fsSL -o /dev/null -w '%{url_effective}' "$web_base/releases/latest" 2>/dev/null || true)"
+  case "$latest_url" in
+    "$web_base"/releases/tag/*)
+      tag="${latest_url##"$web_base"/releases/tag/}"
+      [ -n "$tag" ] || return 1
+      printf '%s/releases/download/%s/%s\n' "$web_base" "$tag" "$(release_artifact_name)"
+      ;;
+    *)
+      return 1
+      ;;
+  esac
+}
+
 find_extracted_binary() {
   find "$1" -type f -name "$2" 2>/dev/null | sed -n '1p'
 }
@@ -256,7 +274,12 @@ try_install_prebuilt() {
   need tar
   if ! curl -fL "$download_url" -o "$archive"; then
     echo "prebuilt unavailable: $download_url" >&2
-    return 1
+    alt_download_url="$(release_latest_tag_download_url || true)"
+    if [ -z "$alt_download_url" ] || ! curl -fL "$alt_download_url" -o "$archive"; then
+      [ -z "$alt_download_url" ] || echo "prebuilt unavailable: $alt_download_url" >&2
+      return 1
+    fi
+    download_url="$alt_download_url"
   fi
   verify_archive_checksum "$download_url" "$archive" "$checksum_file" || return 1
   mkdir -p "$tmpdir/extract"