fix: update shell wrapper usage to include argument for remote execution

.github/workflows/example.yml

@@ -21,7 +21,7 @@ jobs:
           ssh-user: ${{ secrets.SSH_USER }}
       
       - name: Check system info
-        shell: ssh-remote
+        shell: ssh-remote {0}
         run: |
           echo "=== System Information ==="
           whoami
@@ -30,7 +30,7 @@ jobs:
           pwd
       
       - name: Run deployment script
-        shell: ssh-remote
+        shell: ssh-remote {0}
         run: |
           echo "=== Starting Deployment ==="
           cd /var/www || cd ~

README.md

@@ -33,7 +33,7 @@ jobs:
           ssh-user: ${{ secrets.SSH_USER }}
       
       - name: Run remote commands with custom shell
-        shell: ssh-remote
+        shell: ssh-remote {0}
         run: |
           cd /var/www
           git pull origin main
@@ -135,7 +135,7 @@ jobs:
 | `ssh-port` | SSH port | No | `22` |
 | `ssh-known-hosts` | Known hosts content (uses ssh-keyscan if not provided) | No | `''` |
 | `strict-host-key-checking` | Enable strict host key checking (`yes`/`no`/`accept-new`) | No | `accept-new` |
-| `use-shell-wrapper` | Create shell wrapper for remote execution (enables `shell: ssh-remote`) | No | `true` |
+| `use-shell-wrapper` | Create shell wrapper for remote execution (enables `shell: ssh-remote {0}`) | No | `true` |
 | `remote-shell` | Shell to use on remote server (`bash`, `sh`, `zsh`, etc.) | No | `bash` |
 
 ## Outputs
@@ -152,11 +152,11 @@ This action provides two ways to execute commands remotely:
 
 ### 1. Custom Shell Wrapper (Recommended)
 
-Use `shell: ssh-remote` in any step to execute the entire script on the remote server:
+Use `shell: ssh-remote {0}` in any step to execute the entire script on the remote server:
 
 ```yaml
-- name: Deploy application
+    - name: Deploy application
-  shell: ssh-remote
+      shell: ssh-remote {0}
   run: |
     cd /var/www/myapp
     git pull origin main
@@ -166,13 +166,12 @@ Use `shell: ssh-remote` in any step to execute the entire script on the remote s
 
 **Benefits:**
 - Natural multi-line script syntax
-- Automatic error handling with `set -e`
+            shell: ssh-remote {0}
 - Works like a local shell
 - No need to wrap commands in SSH
 
 ### 2. SSH Host Alias (Direct)
 
-Use the `github-action-host` alias for direct SSH commands:
 
 ```yaml
 - name: Run single commands
@@ -183,7 +182,6 @@ Use the `github-action-host` alias for direct SSH commands:
 
 This eliminates the need to specify the host, user, port, and key path in every SSH command.
 
-## Security Best Practices
 
 ### Generating SSH Keys
 
@@ -191,8 +189,7 @@ This eliminates the need to specify the host, user, port, and key path in every
 # Generate a dedicated SSH key pair for GitHub Actions
 ssh-keygen -t ed25519 -C "github-actions" -f github_actions_key
 
-# Or use RSA if ed25519 is not supported
+      shell: ssh-remote {0}
-ssh-keygen -t rsa -b 4096 -C "github-actions" -f github_actions_key
 ```
 
 ### Setting up Secrets
@@ -201,7 +198,6 @@ ssh-keygen -t rsa -b 4096 -C "github-actions" -f github_actions_key
    ```bash
    cat github_actions_key
    ```
-
 2. Add it to GitHub Secrets:
    - Go to your repository → Settings → Secrets and variables → Actions
    - Click "New repository secret"
@@ -216,8 +212,7 @@ ssh-keygen -t rsa -b 4096 -C "github-actions" -f github_actions_key
 ### Getting Known Hosts
 
 To pre-populate known hosts (recommended for security):
-
+      shell: ssh-remote {0}
-```bash
 ssh-keyscan -H your-server.com
 ```
 

action.yml

@@ -183,16 +183,25 @@ runs:
         
         cat << 'WRAPPER_EOF' > "$WRAPPER_PATH"
         #!/bin/bash
-        set -e
+        set -euo pipefail
 
-        # Check if input file is provided
+        # Runner normally passes a temp script path as the first argument.
-        if [ -z "$1" ]; then
+        # If that isn't present, allow script to be piped to stdin.
+        TMPDIR="${TMPDIR:-/tmp}"
+        SCRIPT_FILE=""
+        if [ -n "${1-}" ]; then
+          SCRIPT_FILE="$1"
+        elif ! [ -t 0 ]; then
+          # Write stdin to a temp file
+          TMP_SCRIPT=$(mktemp "$TMPDIR/ssh-remote-stdin-XXXXXX.sh" 2>/dev/null || mktemp -t ssh-remote-stdin-XXXXXX)
+          cat - > "$TMP_SCRIPT"
+          chmod +x "$TMP_SCRIPT"
+          SCRIPT_FILE="$TMP_SCRIPT"
+        else
           echo "Error: No script file provided" >&2
           exit 1
         fi
         
-        SCRIPT_FILE="$1"
-        
         # Check if script file exists
         if [ ! -f "$SCRIPT_FILE" ]; then
           echo "Error: Script file '$SCRIPT_FILE' not found" >&2
@@ -217,7 +226,7 @@ runs:
         if [ "${{ inputs.use-shell-wrapper }}" = "true" ]; then
           echo ""
           echo "To use the remote shell in subsequent steps, add:"
-          echo "  shell: ssh-remote"
+          echo "  shell: ssh-remote {0}"
           echo ""
           echo "The 'ssh-remote' shell is now available for use."
         fi