54 lines
2.3 KiB
Bash
54 lines
2.3 KiB
Bash
 
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#!/usr/bin/env bash
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## stop-services.sh — sourced by the bash PID-1 entrypoints (entrypoint.sh,
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## entrypoint-fpm.sh, entrypoint-shared-httpd.sh). Not executed directly.
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##
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## Why this exists: those entrypoints end with bash as PID 1 tailing logs.
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## The kernel never delivers a signal to PID 1 unless PID 1 installed a handler
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## for it, so `docker stop`'s SIGTERM was silently dropped. Docker waited the
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## full stop timeout (10s) and then SIGKILLed the whole container, killing
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## apache / php-fpm mid-request (exit 137). The entrypoints now trap TERM/INT
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## and call stop_service for each daemon they started, then exit 0.
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##
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## Budget: docker's default stop timeout is 10s. Callers pass per-service
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## timeouts that sum to < 10s so the graceful path always completes before
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## docker gives up and SIGKILLs.
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# A pid counts as alive if it exists and is not a zombie. bash (PID 1) reaps
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# the daemons it adopted, but between exit and reap a zombie still answers
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# `kill -0`, so check /proc state too.
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_svc_alive() {
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[ -n "$1" ] || return 1
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kill -0 "$1" 2>/dev/null || return 1
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! grep -qs '^State:[[:space:]]*Z' "/proc/$1/status"
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}
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# stop_service NAME PIDFILE GRACEFUL_SIGNAL GRACE_SECONDS [PGREP_PATTERN]
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# Sends GRACEFUL_SIGNAL, waits up to GRACE_SECONDS for the process to exit,
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# then sends TERM and waits 1s more, then KILL. Pid comes from PIDFILE, or
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# from `pgrep -o -f PGREP_PATTERN` when the pidfile is missing/stale.
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stop_service() {
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local name=$1 pidfile=$2 sig=$3 grace=$4 pat=${5:-} pid="" i
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[ -r "$pidfile" ] && pid=$(tr -dc '0-9' < "$pidfile")
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if ! _svc_alive "$pid" && [ -n "$pat" ]; then
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pid=$(pgrep -o -f "$pat" 2>/dev/null)
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fi
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if ! _svc_alive "$pid"; then
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echo "entrypoint: $name not running"
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return 0
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fi
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echo "entrypoint: stopping $name (pid $pid) with SIG$sig"
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kill -s "$sig" "$pid" 2>/dev/null
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for ((i = 0; i < grace * 10; i++)); do
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_svc_alive "$pid" || { echo "entrypoint: $name stopped"; return 0; }
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sleep 0.1
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done
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echo "entrypoint: $name still running after ${grace}s, sending SIGTERM"
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kill -TERM "$pid" 2>/dev/null
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for ((i = 0; i < 10; i++)); do
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_svc_alive "$pid" || { echo "entrypoint: $name stopped"; return 0; }
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sleep 0.1
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done
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echo "entrypoint: $name still running, sending SIGKILL"
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kill -KILL "$pid" 2>/dev/null
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return 0
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}
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