feat(get-modified-packages): support fetching for shallow clones

get-modified-packages/get-modified-packages.sh

@@ -15,7 +15,9 @@
     shift
 done
 
+# base_branch is like "origin/main"
 base_branch="${args[0]}"
+echo "base_branch: $base_branch"
 
 # Check args
 if [ "$base_branch" = "" ]; then
@@ -49,8 +51,26 @@
     return 1
 }
 
-# Find modified files from base branch
-modified_files=$(git diff --name-only "$base_branch"...HEAD)
+# Function to check if the base ref SHA is in the commit history
+check_base_ref_in_history() {
+    git rev-list HEAD | grep -q "$(git rev-parse "$base_branch")"
+}
+
+# Fetch the initial shallow clone depth
+depth=1
+
+# Loop to deepen the fetch until the base ref SHA is included
+while ! check_base_ref_in_history; do
+    depth=$((depth * 2))
+    # NOTE: need to specify the bese_branch
+    # NG: git fetch origin/main --deepen=1
+    # OK: git fetch origin main --deepen=1
+    # => $base_branch need to be transformed from "origin/main" to "origin main"
+    git fetch --deepen=$depth
+done
+
+# Get the modified files between base ref and HEAD
+modified_files=$(git diff --name-only $base_branch"...HEAD)
 
 # Find modified packages
 modified_package_dirs=()