From fdf50f0064e7fa7949a3acf0e94bea5ab00463b8 Mon Sep 17 00:00:00 2001
From: Jeremy Lin <jjlin@cs.stanford.edu>
Date: Tue, 24 Mar 2020 19:57:10 -0700
Subject: [PATCH] Update healthcheck script to handle alternate base dir

---
 docker/healthcheck.sh | 58 +++++++++++++++++++++++++++++++++++++------
 1 file changed, 51 insertions(+), 7 deletions(-)
 mode change 100644 => 100755 docker/healthcheck.sh

diff --git a/docker/healthcheck.sh b/docker/healthcheck.sh
old mode 100644
new mode 100755
index bd7e696..88c1091
--- a/docker/healthcheck.sh
+++ b/docker/healthcheck.sh
@@ -1,8 +1,52 @@
-#!/usr/bin/env sh
+#!/bin/sh
 
-if [ -z "$ROCKET_TLS"]
-then
-  curl --fail http://localhost:${ROCKET_PORT:-"80"}/alive || exit 1
-else
-  curl --insecure --fail https://localhost:${ROCKET_PORT:-"80"}/alive || exit 1
-fi
\ No newline at end of file
+# Use the value of the corresponding env var (if present),
+# or a default value otherwise.
+: ${DATA_FOLDER:="data"}
+: ${ROCKET_PORT:="80"}
+
+CONFIG_FILE="${DATA_FOLDER}"/config.json
+
+# Given a config key, return the corresponding config value from the
+# config file. If the key doesn't exist, return an empty string.
+get_config_val() {
+    local key="$1"
+    # Extract a line of the form:
+    #   "domain": "https://bw.example.com/path",
+    grep "\"${key}\":" "${CONFIG_FILE}" |
+    # To extract just the value (https://bw.example.com/path), delete:
+    # (1) everything up to and including the first ':',
+    # (2) whitespace and '"' from the front,
+    # (3) ',' and '"' from the back.
+    sed -e 's/[^:]\+://' -e 's/^[ "]\+//' -e 's/[,"]\+$//'
+}
+
+# Extract the base path from a domain URL. For example:
+# - `` -> ``
+# - `https://bw.example.com` -> ``
+# - `https://bw.example.com/` -> ``
+# - `https://bw.example.com/path` -> `/path`
+# - `https://bw.example.com/multi/path` -> `/multi/path`
+get_base_path() {
+    echo "$1" |
+    # Delete:
+    # (1) everything up to and including '://',
+    # (2) everything up to '/',
+    # (3) trailing '/' from the back.
+    sed -e 's|.*://||' -e 's|[^/]\+||' -e 's|/*$||'
+}
+
+# Read domain URL from config.json, if present.
+if [ -r "${CONFIG_FILE}" ]; then
+    domain="$(get_config_val 'domain')"
+    if [ -n "${domain}" ]; then
+        # config.json 'domain' overrides the DOMAIN env var.
+        DOMAIN="${domain}"
+    fi
+fi
+
+base_path="$(get_base_path "${DOMAIN}")"
+if [ -n "${ROCKET_TLS}" ]; then
+    s='s'
+fi
+curl --insecure --fail "http${s}://localhost:${ROCKET_PORT}${base_path}/alive" || exit 1