ADMIN: reload: add a synchronous reload helper

haproxy-reload is a utility script which reload synchronously using the
master CLI, instead of asynchronously with kill.

diff --git a/admin/cli/haproxy-reload b/admin/cli/haproxy-reload
new file mode 100755 (executable)
index 0000000..3c421a4
--- /dev/null
+++ b/admin/cli/haproxy-reload
@@ -0,0 +1,83 @@
+#!/bin/bash
+
+set -e
+
+export TIMEOUT=90
+export MASTER_SOCKET=${MASTER_SOCKET:-/var/run/haproxy-master.sock}
+export RET=
+
+reload() {
+       while read -r line; do
+
+               if [ "$line" = "Success=0" ]; then
+                       RET=1
+               elif [ "$line" = "Success=1" ]; then
+                       RET=0
+               elif [ "$line" = "Another reload is still in progress." ]; then
+                       echo "[ALERT] Another reload is still in progress." >&2
+               fi
+
+       done < <(echo "reload" | socat -t"${TIMEOUT}" "${MASTER_SOCKET}" -)
+
+       if [ -z "$RET" ]; then
+               echo "[ALERT] Couldn't finish the reload before the timeout (${TIMEOUT})." >&2
+               return 1
+       fi
+
+       return "$RET"
+}
+
+usage() {
+       echo "Usage:"
+       echo " $0 [options]*"
+       echo ""
+       echo " Trigger a reload from the master socket"
+       echo " Require socat"
+       echo " EXPERIMENTAL script!"
+       echo ""
+       echo "Options:"
+       echo "  -S, --master-socket <path>   Use the master socket at <path> (default: ${MASTER_SOCKET})"
+       echo "  -d, --debug                  Debug mode, set -x"
+       echo "  -t, --timeout                Timeout (socat -t) (default: ${TIMEOUT})"
+       echo "  -v, --verbose                Verbose mode"
+       echo "  -h, --help                   This help"
+       echo ""
+       echo "Examples:"
+       echo "  $0 -S ${MASTER_SOCKET} -d ${TIMEOUT}"
+}
+
+
+main() {
+       while [ -n "$1" ]; do
+               case "$1" in
+                       -S|--master-socket)
+                               MASTER_SOCKET="$2"
+                               shift 2
+                               ;;
+                       -t|--timeout)
+                               TIMEOUT="$2"
+                               shift 2
+                               ;;
+                       -d|--debug)
+                               DEBUG=1
+                               shift
+                               ;;
+                       -h|--help)
+                               usage "$@"
+                               exit 0
+                               ;;
+                       *)
+                               echo "[ALERT] ($$) : Unknown option '$1'" >&2
+                               usage "$@"
+                               exit 1
+                               ;;
+               esac
+       done
+
+       if [ -n "$DEBUG" ]; then
+               set -x
+       fi
+}
+
+main "$@"
+reload