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59 lines
1.5 KiB
59 lines
1.5 KiB
2 years ago
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#!/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%%=*}|${arg#*=}|g;"
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done
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# Perform substitutions
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sudo sh -c "sed \"$substitution_cmd\" \"$template_path\" > \"$service_path\""
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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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echo "Enter a value for $var: "
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read -r value
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sed -i "s|\$$var|$value|g" "$service_path"
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fi
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fi
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done < "$service_path"
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# Set permissions
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sudo chmod 644 "$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
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