fix invalid format in Prepare Flutter SDKs

.gitea/workflows/android.yml

@@ -338,16 +338,48 @@ jobs:
         run: |
           set -euxo pipefail
 
+          # GNU tar inside this runner/container cannot always restore the
+          # UID/GID stored in Flutter archives. Flutter uses the system tar
+          # while filling its cache, so force extraction as the current user.
+          export TAR_OPTIONS="--no-same-owner"
+
           flutter_version() {
             local root="$1"
+            local version=""
 
             if [ ! -x "${root}/bin/flutter" ]; then
               return 1
             fi
 
-            "${root}/bin/flutter" --version 2>/dev/null |
-              head -n 1 |
-              awk '{print $2}'
+            # The prebuilt SDK directories can be owned by another UID.
+            # Mark them safe before asking Git for the checked-out tag.
+            git config --global \
+              --add safe.directory "${root}" \
+              >/dev/null 2>&1 \
+              || true
+
+            # Prefer Git metadata: it is quiet and does not bootstrap/download
+            # Flutter artifacts just to discover the SDK version.
+            version="$(
+              git \
+                -C "${root}" \
+                describe \
+                --tags \
+                --exact-match \
+                HEAD \
+                2>/dev/null \
+                || true
+            )"
+
+            if [ -n "${version}" ]; then
+              printf '%s\n' "${version}"
+              return 0
+            fi
+
+            # Fallback for an SDK without usable Git metadata.
+            "${root}/bin/flutter" --version 2>&1 |
+              sed -n 's/^Flutter \([^ ]*\).*/\1/p' |
+              head -n 1
           }
 
           ensure_flutter() {
@@ -361,10 +393,17 @@ jobs:
               [ "$(flutter_version "${preferred}" || true)" = "${version}" ]
             ); then
               root="${preferred}"
+              echo \
+                "Using preinstalled ${role} Flutter ${version}: ${root}" \
+                >&2
             else
               root="${HOME}/.cache/rustdesk/flutter-${version}"
 
               if [ "$(flutter_version "${root}" || true)" != "${version}" ]; then
+                echo \
+                  "Installing ${role} Flutter ${version}: ${root}" \
+                  >&2
+
                 rm -rf "${root}"
                 mkdir -p "$(dirname "${root}")"
 
@@ -372,18 +411,39 @@ jobs:
                   --branch "${version}" \
                   --depth 1 \
                   https://github.com/flutter/flutter.git \
-                  "${root}"
+                  "${root}" \
+                  >&2
+              else
+                echo \
+                  "Using cached ${role} Flutter ${version}: ${root}" \
+                  >&2
               fi
             fi
 
             git config --global \
               --add safe.directory "${root}" \
+              >/dev/null 2>&1 \
               || true
 
-            "${root}/bin/flutter" config --no-analytics
-            "${root}/bin/flutter" precache --android
+            # IMPORTANT: ensure_flutter is used inside $(...).
+            # Everything except the final path MUST go to stderr, otherwise
+            # command output becomes part of *_FLUTTER_ROOT.
+            "${root}/bin/flutter" \
+              config \
+              --no-analytics \
+              >&2
 
-            printf '%s' "${root}"
+            # Bridge generation only needs the Flutter/Dart toolchain and pub.
+            # Download Android engine/Gradle artifacts only for the SDK that
+            # actually builds the APK.
+            if [ "${role}" = "android" ]; then
+              "${root}/bin/flutter" \
+                precache \
+                --android \
+                >&2
+            fi
+
+            printf '%s\n' "${root}"
           }
 
           BRIDGE_FLUTTER_ROOT="$(
@@ -400,12 +460,30 @@ jobs:
               android
           )"
 
+          # Guard against accidental stdout pollution.
+          if [ ! -x "${BRIDGE_FLUTTER_ROOT}/bin/flutter" ]; then
+            echo \
+              "ERROR: Invalid BRIDGE_FLUTTER_ROOT: ${BRIDGE_FLUTTER_ROOT}" \
+              >&2
+            exit 1
+          fi
+
+          if [ ! -x "${ANDROID_FLUTTER_ROOT}/bin/flutter" ]; then
+            echo \
+              "ERROR: Invalid ANDROID_FLUTTER_ROOT: ${ANDROID_FLUTTER_ROOT}" \
+              >&2
+            exit 1
+          fi
+
           echo "BRIDGE_FLUTTER_ROOT=${BRIDGE_FLUTTER_ROOT}" \
             >> "${GITHUB_ENV}"
 
           echo "ANDROID_FLUTTER_ROOT=${ANDROID_FLUTTER_ROOT}" \
             >> "${GITHUB_ENV}"
 
+          echo "TAR_OPTIONS=${TAR_OPTIONS}" \
+            >> "${GITHUB_ENV}"
+
           echo "Bridge Flutter:"
           "${BRIDGE_FLUTTER_ROOT}/bin/flutter" --version