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#!/bin/bash
get_ident() {
local pid=$1
ps h -o lstart -p "$pid"
}
is_running() {
local pidfile=$1
if [[ -f "$pidfile" ]]; then
read -r pid ident1 <"$pidfile"
ident2="$(get_ident "$pid")"
if [[ "$ident1" == "$ident2" ]] && [[ -n "$ident2" ]]; then
return 0
else
return 1
fi
else
return 1;
fi
}
main() {
# Parse arguments
if [[ $1 = '-i' ]]; then
shift
id=$1
shift
else
id=$1
fi
# Init variables
TMP=${TMPDIR-/tmp}/daemon
PIDFILE="$TMP/$id.pid"
OUTFILE="$TMP/$id.out"
ERRFILE="$TMP/$id.err"
# Run
if is_running "$PIDFILE"; then
echo "daemon: \`$id' is already running"
else
mkdir -p "$TMP"
echo "daemon: starting \`$id'"
nohup "$@" > "$OUTFILE" 2> "$ERRFILE" &
pid=$!
echo "$pid" "`get_ident $pid`" > "$PIDFILE"
fi
}
main "$@"
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