Setup git alias to configure git per repo

git-setup.sh

#!/bin/bash

# --- INSTALL WRAPPER ---
INSTALL_DIR="$HOME/.local/bin"
INSTALL_PATH="$INSTALL_DIR/git-setup"
BASHRC="$HOME/.bashrc"

mkdir -p "$INSTALL_DIR"

if [ "$(basename "$0")" != "git-setup" ]; then
    echo "Installing git-setup to $INSTALL_PATH..."
    cp "$0" "$INSTALL_PATH"
    chmod +x "$INSTALL_PATH"
    if ! grep -q "alias git-setup=" "$BASHRC"; then
        echo "alias git-setup='$INSTALL_PATH'" >> "$BASHRC"
        echo "✅ Alias added to $BASHRC"
    fi
    echo "✅ Installation complete. Reload shell: source $BASHRC"
    exit 0
fi

# --- CONFIGURATION ---
SSH_DIR="$HOME/.ssh"
REMOTE_NAME="dev"
SSH_CONFIG="$SSH_DIR/config"
GPG_KEY_ID="8FED9D2E4BA47F0156030740980F354B5EEF0B51"

mkdir -p "$SSH_DIR"
chmod 700 "$SSH_DIR"

# --- SSH KEY SETUP ---
if grep -q "^Host github-${REMOTE_NAME}" "$SSH_CONFIG" 2>/dev/null; then
    SSH_KEY_PATH=$(grep -A 3 "^Host github-${REMOTE_NAME}" "$SSH_CONFIG" | grep "IdentityFile" | awk '{print $2}')
    SSH_PUB_PATH="${SSH_KEY_PATH}.pub"
    echo "✅ 'Host github-${REMOTE_NAME}' configuration already exists"
    echo "🔍 Verifying SSH key..."
    if [ -f "$SSH_KEY_PATH" ]; then
        echo "✅ SSH key verified: $SSH_KEY_PATH"
    else
        echo "❌ SSH key file missing: $SSH_KEY_PATH"
        exit 1
    fi
else
    SSH_KEY_PATH="$SSH_DIR/id_${REMOTE_NAME}_ed25519"
    SSH_PUB_PATH="${SSH_KEY_PATH}.pub"
    echo "SSH key for $REMOTE_NAME not found."
    echo "Generate or Import SSH key? (g/i/cancel)"
    read -r ssh_action
    case "$ssh_action" in
        g)
            ssh-keygen -t ed25519 -C "$REMOTE_NAME@github" -f "$SSH_KEY_PATH" -N "" || { echo "❌ SSH key generation failed"; exit 1; }
            chmod 600 "$SSH_KEY_PATH"
            ;;
        i)
            echo "Enter path to private key file:"
            read -r key_file_path
            if [ ! -f "$key_file_path" ]; then
                echo "❌ File not found"; exit 1
            fi
            cat "$key_file_path" | dos2unix 2>/dev/null > "$SSH_KEY_PATH" || cat "$key_file_path" > "$SSH_KEY_PATH"
            chmod 600 "$SSH_KEY_PATH"
            ;;
        *)
            echo "❌ SSH key required. Exiting."; exit 1
            ;;
    esac
    [ ! -f "$SSH_PUB_PATH" ] && ssh-keygen -y -f "$SSH_KEY_PATH" > "$SSH_PUB_PATH" && chmod 644 "$SSH_PUB_PATH"
fi

# --- VERIFY SSH ---
echo "🔍 Testing SSH connection to GitHub..."
GIT_SSH_COMMAND="ssh -i $SSH_KEY_PATH -o IdentitiesOnly=yes" ssh -T git@github.com || { echo "❌ SSH failed"; exit 1; }
echo "✅ SSH authentication successful!"

# --- GPG SETUP ---
if ! gpg --list-secret-keys "$GPG_KEY_ID" >/dev/null 2>&1; then
    echo "❌ GPG key $GPG_KEY_ID not found in keyring"
    echo "Import your key now? (provide file path or cancel)"
    read -r gpg_file
    if [ -f "$gpg_file" ]; then
        gpg --import "$gpg_file" || { echo "❌ Failed to import GPG"; exit 1; }
    else
        echo "❌ No GPG key provided. Exiting."; exit 1
    fi
fi
echo "✅ GPG key ready: $GPG_KEY_ID"

# --- LOCAL GIT CONFIG ---
read -p "Enter Git name for this repo: " GIT_NAME
git config user.name "$GIT_NAME"

read -p "Enter Git email for this repo: " GIT_EMAIL
git config user.email "$GIT_EMAIL"

git config commit.gpgsign true
git config user.signingkey "$GPG_KEY_ID"
echo "✅ Local Git configured: name, email, signing key"

# --- VERIFY COMMIT SIGNING ---
echo "🔍 Testing commit signing..."
TMP_REPO=$(mktemp -d)
cd "$TMP_REPO" || exit 1
git init
git commit --allow-empty -m "Test commit" || { echo "❌ Commit signing failed"; exit 1; }
cd - >/dev/null
rm -rf "$TMP_REPO"
echo "✅ Commit signing works"

# --- FINISH ---
echo ""
echo "🎉 Setup complete. You can now run 'git push origin main' normally in this repo."

git config commit.gpgsign true
git config user.signingkey