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66 lines
1.7 KiB
66 lines
1.7 KiB
#!/bin/sh |
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# This script serves as a magic scroll that conjures a systemd service |
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# from a given template and a set of variable-value pairs |
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if [ $# -lt 1 ]; then |
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echo "Usage: $0 /path/to/service/template key=value [key=value...]" |
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exit 1 |
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fi |
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# Ensure systemd is available |
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if ! command -v systemctl >/dev/null 2>&1; then |
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echo "Systemd is not installed or not in PATH. Exiting." |
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exit 1 |
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fi |
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service_dir=/etc/systemd/system |
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template_path=$1 |
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service_file=$(basename "$template_path") |
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service_path="$service_dir/$service_file" |
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# Ask for confirmation before overwriting an existing file |
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if [ -f "$service_path" ]; then |
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if ask_yn "Service file $service_path already exists. Overwrite?" "N"; then |
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echo "User chose not to overwrite. Exiting." |
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exit 1 |
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fi |
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fi |
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# Prepare a sed command based on the remaining arguments |
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shift |
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substitution_cmd="" |
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for arg in "$@"; do |
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substitution_cmd="${substitution_cmd}s|\\\$${arg%%=*}|${arg#*=}|g;" |
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done |
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# Perform substitutions into a temporary file in /tmp |
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tmp_file="/tmp/tmp_service" |
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sed "$substitution_cmd" "$template_path" > "$tmp_file" |
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# Ask for missing variables |
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while IFS= read -r line; do |
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if echo "$line" | grep -q '\$'; then |
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var=$(echo "$line" | sed -n -e 's/^.*\$\([A-Z_]*\).*$/\1/p') |
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if [ -n "$var" ]; then |
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eval value=\$$var |
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if [ -z "$value" ]; then |
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echo "Enter a value for $var: " |
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read -r value |
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fi |
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sed -i "s|\$$var|$value|g" "$tmp_file" |
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fi |
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fi |
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done < "$tmp_file" |
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# Move the temporary file to the final destination |
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sudo mv "$tmp_file" "$service_path" |
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# Set permissions |
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sudo chmod 644 "$service_path" |
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# Reload systemd |
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systemctl daemon-reload |
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echo "Service installed at $service_path" |
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exit 0 |