diff --git a/action.yml b/action.yml
index 1941c1b..24835a4 100644
--- a/action.yml
+++ b/action.yml
@@ -8,11 +8,26 @@ inputs:
   working-directory:
     description: "working directory"
     required: false
+  shell:
+    description: "shell (options: 'bash' or 'msys2 {0}')"
+    default: "bash"
+    required: false
 
 runs:
   using: "composite"
   steps:
-    - shell: bash
+    - name: create bash-or-msys2 (for bash)
+      shell: bash
+      if: inputs.shell == 'bash'
+      run: sudo ln -sf $(which bash) /usr/local/bin/bash-or-msys2
+    - name: create bash-or-msys2 (for msys2)
+      shell: bash
+      if: inputs.shell == 'msys2 {0}'
+      run: |
+        if [[ ! -f "D:/a/_temp/setup-msys2/bash-or-msys2.cmd" ]]; then
+          powershell New-Item -ItemType SymbolicLink -Path "D:/a/_temp/setup-msys2/bash-or-msys2.cmd" -Target "D:/a/_temp/setup-msys2/msys2.cmd"
+        fi
+    - shell: bash-or-msys2 {0}
       working-directory: ${{ inputs.working-directory }}
       run: |
         status=0