fix: robust latest tag resolution in installer for API and HTML fallback

Author: Kingson4Wu

install.sh

@@ -37,28 +37,36 @@ command -v uv >/dev/null 2>&1 || {
 }
 UV_BIN="$(command -v uv)"
 
-# 2. resolve the release tag (GitHub API is used first; fallback keeps old behaviour).
+# 2. resolve the release tag (GitHub API is used first; fallback parses latest release page).
 if [ "$VERSION" = "latest" ]; then
+  TAG=""
   api_response="$(mktemp)"
-  if ! curl -fsSL \
+  if curl -fsSL \
     -H "Accept: application/vnd.github+json" \
     -H "User-Agent: git-auto-sync-installer" \
     "https://api.github.com/repos/$REPO/releases/latest" \
     -o "$api_response"; then
+    TAG="$(grep -m1 -o '\"tag_name\"[[:space:]]*:[[:space:]]*\"[^\"]*\"' "$api_response" \
+      | sed 's/.*\"tag_name\"[[:space:]]*:[[:space:]]*\"\\([^\"]*\\)\"/\\1/')"
+  else
     rm -f "$api_response"
-    err "Couldn't reach GitHub to resolve the latest release."
+    err "Couldn't reach GitHub API to resolve the latest release."
     exit 1
   fi
-  TAG="$(sed -n 's/.*"tag_name"[[:space:]]*:[[:space:]]*"\\([^"]*\\)".*/\\1/p' "$api_response" | head -n 1)"
   rm -f "$api_response"
   if [ -z "$TAG" ] || [ "${TAG#v}" = "$TAG" ]; then
-    info "GitHub API did not return a release tag, falling back to web redirect resolution."
-    url="$(curl -fsSLI -o /dev/null -w '%{url_effective}' \
-      "https://github.com/$REPO/releases/latest")" || {
+    TAG=""
+  fi
+  if [ -z "$TAG" ]; then
+    info "GitHub API did not return a release tag, resolving from latest release page."
+    page="$(mktemp)"
+    if ! curl -fsSL -A "git-auto-sync-installer" "https://github.com/$REPO/releases/latest" -o "$page"; then
+      rm -f "$page"
       err "Couldn't resolve the latest release."
       exit 1
-    }
-    TAG="${url##*/}"
+    fi
+    TAG="$(grep -m1 -o '/'"$REPO"'/releases/tag/v[^\"[:space:]]*' "$page" | sed 's#.*/tag/##' | head -n 1)"
+    rm -f "$page"
   fi
 else
   TAG="$VERSION"