feat: pull submodule history for pull request events (#1003)

Author: jackton1

.github/workflows/test.yml

@@ -342,12 +342,15 @@ jobs:
       max-parallel: 4
       matrix:
         platform: [ubuntu-latest]
+        fetch-depth: [0, 1]
 
     steps:
       - name: Checkout to branch
         uses: actions/checkout@v3
         with:
+          ref: ${{ github.event.pull_request.head.sha || github.sha }}
           submodules: recursive
+          fetch-depth: ${{ matrix.fetch-depth }}
 
       - name: Run changed-files with submodule
         id: changed-files

diff-sha.sh

@@ -75,8 +75,11 @@ if [[ -z $GITHUB_EVENT_PULL_REQUEST_BASE_REF ]]; then
       # shellcheck disable=SC2086
       git fetch $EXTRA_ARGS -u --progress --deepen="$INPUT_FETCH_DEPTH" origin +refs/heads/"$SOURCE_BRANCH":refs/remotes/origin/"$SOURCE_BRANCH" 1>/dev/null
     fi
-    # shellcheck disable=SC2086
-    git submodule foreach git fetch $EXTRA_ARGS -u --progress --deepen="$INPUT_FETCH_DEPTH" || true
+
+    if git submodule status &>/dev/null; then
+      # shellcheck disable=SC2086
+      git submodule foreach git fetch $EXTRA_ARGS -u --progress --deepen="$INPUT_FETCH_DEPTH" || true
+    fi
   fi
 
   echo "::debug::Getting HEAD SHA..."
@@ -194,6 +197,11 @@ else
       git fetch $EXTRA_ARGS -u --progress --deepen="$INPUT_FETCH_DEPTH" origin +refs/heads/"$TARGET_BRANCH":refs/remotes/origin/"$TARGET_BRANCH" 1>/dev/null
       git branch --track "$TARGET_BRANCH" origin/"$TARGET_BRANCH" 1>/dev/null || true
     fi
+
+    if git submodule status &>/dev/null; then
+      # shellcheck disable=SC2086
+      git submodule foreach git fetch $EXTRA_ARGS -u --progress --deepen="$INPUT_FETCH_DEPTH" || true
+    fi
   fi
 
   echo "::debug::Getting HEAD SHA..."

get-changed-paths.sh

@@ -93,7 +93,6 @@ function get_diff() {
     fi
   done < <(git submodule status --recursive | grep -v "^-" | awk '{print $2}')
 
-
   if [[ "$filter" == "D" ]]; then
     while read -r sub; do
        echo "$sub"