Restore wait_for_baas.sh script (#8027)

evergreen/wait_for_baas.sh

@@ -0,0 +1,100 @@
+#!/usr/bin/env bash
+# The script to wait up to approx 600 seconds (default) for the baas server to
+# start, which is indicated by being able to successfully "curl" the baas
+# server endpoint. If a pid file is provided, it will be used to verify the
+# baas server is still running. The retry count specifies the number of
+# attempts to query the server endpoint, with a 5 sec wait between attempts.
+# If a server log path is provided, the last entries will be printed to stdout
+# using the 'tail' command after each attempt.
+#
+# Usage:
+# ./evergreen/wait_for_baas.sh [-w PATH] [-p FILE] [-r COUNT] [-l FILE] [-s] [-v] [-h]
+#
+
+set -o errexit
+set -o pipefail
+
+CURL=${CURL:=curl}
+BAAS_PID_FILE=
+BAAS_STOPPED_FILE=
+RETRY_COUNT=120
+BAAS_SERVER_LOG=
+STATUS_OUT=
+
+function usage()
+{
+    echo "Usage: wait_for_baas.sh [-w PATH] [-p FILE] [-r COUNT] [-l FILE] [-s] [-v] [-h]"
+    echo "Options:"
+    echo -e "\t-w PATH\t\tPath to baas server working directory"
+    echo -e "\t-p FILE\t\tPath to baas server pid file (also set by -w option)"
+    echo -e "\t-r COUNT\tNumber of attempts to check for baas server (default 120)"
+    echo -e "\t-l FILE\t\tPath to baas server log file (also set by -w option)"
+    echo -e "\t-s\t\tDisplay a status for each attempt"
+    echo -e "\t-v\t\tEnable verbose script debugging"
+    echo -e "\t-h\t\tShow this usage summary and exit"
+    # Default to 0 if exit code not provided
+    exit "${1:0}"
+}
+
+function update_paths()
+{
+    if [[ -n "${1}" ]]; then
+        BAAS_SERVER_LOG="${1}/baas_server.log"
+        BAAS_STOPPED_FILE="${1}/baas_stopped"
+        BAAS_PID_FILE="${1}/baas_server.pid"
+    fi
+}
+
+while getopts "w:p:r:l:svh" opt; do 
+    case "${opt}" in
+        w) update_paths "${OPTARG}";;
+        p) BAAS_PID_FILE="${OPTARG}";;
+        r) RETRY_COUNT="${OPTARG}";;
+        l) BAAS_SERVER_LOG="${OPTARG}";;
+        s) STATUS_OUT="yes";;
+        v) set -o verbose; set -o xtrace;;
+        h) usage 0;;
+        *) usage 1;;
+    esac
+done
+
+WAIT_COUNTER=0
+WAIT_START=$(date -u +'%s')
+
+function output_log_tail()
+{
+    if [[ -n "${BAAS_SERVER_LOG}" && -f "${BAAS_SERVER_LOG}" ]]; then
+        tail -n 10 "${BAAS_SERVER_LOG}"
+    fi
+}
+
+echo "Waiting for baas server to start..."
+until $CURL --output /dev/null --head --fail http://localhost:9090 --silent ; do
+    if [[ -n "${BAAS_STOPPED_FILE}" && -f "${BAAS_STOPPED_FILE}" ]]; then
+        echo "Baas server failed to start (found baas_stopped file)"
+        output_log_tail
+        exit 1
+    fi
+
+    if [[ -n "${BAAS_PID_FILE}" && -f "${BAAS_PID_FILE}" ]]; then
+        if ! pgrep -F "${BAAS_PID_FILE}" > /dev/null; then
+            echo "Baas server $(< "${BAAS_PID_FILE}") is no longer running"
+            output_log_tail
+            exit 1
+        fi
+    fi
+
+    ((++WAIT_COUNTER))
+    secs_spent_waiting=$(($(date -u +'%s') - WAIT_START))
+    if [[ ${WAIT_COUNTER} -ge ${RETRY_COUNT} ]]; then
+        echo "Timed out after ${secs_spent_waiting} secs waiting for baas server to start"
+        output_log_tail
+        exit 1
+    fi
+
+    if [[ -n "${STATUS_OUT}" ]]; then
+        echo "Waiting for baas server to start... ${secs_spent_waiting} secs so far"
+    fi
+
+    sleep 5
+done