beta s6 secrets

Author: ahgraber

docker/rootfs/etc/cont-init.d/.gitignore

@@ -1,2 +1,3 @@
 *
 !.gitignore
+!01_envfile.sh

docker/rootfs/etc/cont-init.d/01_envfile.sh

@@ -0,0 +1,28 @@
+#! /bin/bash
+# ref: https://github.com/linuxserver/docker-baseimage-alpine/blob/master/root/etc/cont-init.d/01-envfile
+
+# in s6, environmental variables are written as text files for s6 to monitor
+for FILENAME in $(find /var/run/s6/container_environment/ | grep "^.*__FILE"); do
+    echo "[secret-init] Evaluating ${FILENAME}"
+
+    # set SECRETFILE to the contents of the variable
+    SECRETFILE=$(cat ${FILENAME})
+    # SECRETFILE=${FILENAME}
+    echo "[secret-init] Setting SECRETFILE to ${SECRETFILE}..."  # DEBUG - rm for prod!
+
+    # if SECRETFILE exists / is not null
+    if [[ -f ${SECRETFILE} ]]; then
+        # strip the appended "__FILE" from environmental variable name ...
+        STRIPFILE=$(echo $FILENAME | sed "s/__FILE//g")   
+        echo "[secret-init] Set STRIPFILE to ${STRIPFILE}"  # DEBUG - rm for prod!
+
+        # ... and set value to contents of secretfile
+        # since s6 uses text files, this is effectively "export ..."
+        cat ${SECRETFILE} > ${STRIPFILE}
+        echo "[secret-init] Set ${STRIPFILE} to $(cat ${STRIPFILE})"  # DEBUG - rm for prod!"
+        echo "[secret-init] Success! ${STRIPFILE##*/} set from ${FILENAME##*/}"
+
+    else
+        echo "[secret-init] cannot find secret in ${FILENAME##*/}"
+    fi
+done