From 1aa3187212591975420f2fd3d4f1ad70c5ee01ed Mon Sep 17 00:00:00 2001
From: decentral1se <hi@decentral1.se>
Date: Wed, 16 Jun 2021 11:21:29 +0200
Subject: [PATCH] Add entrypoint file

---
 entrypoint.sh.tmpl | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)
 create mode 100644 entrypoint.sh.tmpl

diff --git a/entrypoint.sh.tmpl b/entrypoint.sh.tmpl
new file mode 100644
index 0000000..9ad7dee
--- /dev/null
+++ b/entrypoint.sh.tmpl
@@ -0,0 +1,29 @@
+#! /bin/bash
+
+set -eu
+
+file_env() {
+  local var="$1"
+  local fileVar="${var}_FILE"
+  local def="${2:-}"
+
+  if [ "${!var:-}" ] && [ "${!fileVar:-}" ]; then
+    echo >&2 "error: both $var and $fileVar are set (but are exclusive)"
+    exit 1
+  fi
+
+  local val="$def"
+  if [ "${!var:-}" ]; then
+    val="${!var}"
+  elif [ "${!fileVar:-}" ]; then
+    val="$(< "${!fileVar}")"
+  fi
+
+  export "$var"="$val"
+  unset "$fileVar"
+}
+
+file_env "MASTODON_ACCESS_TOKEN"
+
+echo "Passing it back to the upstream ENTRYPOINT/CMD..."
+exec "$@"