[WIP] Docker Templater

.gitignore

@@ -1,2 +1,2 @@
-/etc/ssh/*key*
-/etc/ssh/.ssh
+etc/ssh/*key*
+etc/ssh/.ssh/

script/docker-templater.sh

@@ -0,0 +1,122 @@
+#!/usr/bin/env bash
+# Export Variables so they can be picked up by envsubst
+set -ae
+TEMPLATE_SRC=$1;
+DOCKER_DATA=$2;
+
+NETWORK_NAME="${NETWORK_NAME:-proxy}"
+
+# "NetworkSettings"
+
+# Import Template
+# Required Variables:
+# - TEMPLATE :: The template string which will be read by envsubst
+# Optional Variables:
+# - WRAP_START :: String to prepend in front of the mapped template result
+# - WRAP_END :: String to append to the mapped template result
+# - SEPARATOR :: String/Charater to separate TEMPLATE lines (DEFAULT: \n)
+# - OUT :: if set the result will be written to $OUT instead of stdout
+# Optional Functions:
+# - label_hook :: modify/override label query results
+# - template_hook :: hook to verify/modify template rsults (0 => OK; 1 => SKIP)
+
+if [ -f "${TEMPLATE_SRC}" ]
+then
+    source "${TEMPLATE_SRC}"
+    if [ -z "${TEMPLATE}" ]
+    then
+        echo "[ERR]: Template \"${TEMPLATE_SRC}\" does define a template string."
+        exit 1
+    fi
+else
+    echo "[ERR]: No such File \"${TEMPLATE_SRC}\".";
+    exit 1
+fi
+
+# Check Hooks
+if type label_hook 2>/dev/null | grep -q "label_hook is a function"
+then
+    RUN_LABEL_HOOK=true
+else
+    RUN_LABEL_HOOK=false
+fi
+
+if type template_hook 2>/dev/null | grep -q "template_hook is a function"
+then
+    RUN_TEMPLATE_HOOK=true
+else
+    RUN_TEMPLATE_HOOK=false
+fi
+
+if [ -z "${SEPARATOR+.}" ]
+then
+    SEPARATOR='\n'
+fi
+
+for row in $(jq -r '.[] | @base64' <<< "${DOCKER_DATA}")
+do
+    CONTAINER_DATA=$(base64 --decode <<< "${row}");
+    # Set non Label values
+    if [ -z "${LOCAL_IP}" ]
+    then
+        LOCAL_IP=$(jq -r '.NetworkSettings.Networks | if has($ENV.NETWORK_NAME) then .[$ENV.NETWORK_NAME].IPAddress else first(.[].IPAddress) end' <<< "${CONTAINER_DATA}");
+    fi
+    # export LOCAL_IP
+
+    # Read Label values
+    CONTAINER_LABELS=$(jq '.Labels' <<< "${CONTAINER_DATA}");
+    for var in $(envsubst -v "${TEMPLATE}")
+    do
+        if [ -z "${!var}" ]
+        then
+            VAR_LABEL=$(tr '[:upper:]_' '[:lower:].' <<< "${var}")
+            LABEL_VAL=$(jq --arg KEY "${VAR_LABEL}" -r 'if has($KEY) then .[$KEY] else "" end' <<< "${CONTAINER_LABELS}")
+
+            if [ -n "${LABEL_VAL}" ]
+            then
+                declare "${var}"="${LABEL_VAL}";
+            fi
+        fi
+    done
+
+    if ${RUN_LABEL_HOOK}
+    then
+        label_hook
+    fi
+
+    PARTIAL_RESULT="$(envsubst <<< "${TEMPLATE}")";
+    # Verify template result if check_template is defined
+    if ${RUN_TEMPLATE_HOOK}
+    then
+        if template_hook
+        then
+            # FIX with printf
+            RESULT+="${PARTIAL_RESULT}"
+        fi
+    else
+        RESULT=$(printf '%s' "${RESULT}" "${RESULT:+$SEPARATOR}" "${PARTIAL_RESULT}")
+    fi
+
+    # Unset label-environment variables for next container
+    for var in $(envsubst -v "${TEMPLATE}")
+    do
+        if [ "${var}" != "LOCAL_IP" ]
+        then
+            unset "${!var}"
+        fi
+    done
+done
+
+RESULT="${WRAP_START}${RESULT}${WRAP_END}"
+
+
+if [ -z "${OUT}" ]
+then
+    printf "%b\n" "${RESULT}";
+else
+    if ! diff --brief "${OUT}" - > /dev/null 2>&1 <<< "${RESULT}"
+    then
+        printf "Template Task: '%s' has been written to: '%s'\n" "${TEMPLATE_SRC}" "${OUT}"
+        printf "%b\n" "${RESULT}" > "${OUT}";
+    fi
+fi

templates/caddy.sh

@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+set -e
+
+TEMPLATE='reverse_proxy $LOCAL_WEB_HOST ${LOCAL_IP}:$LOCAL_WEB_PORT'
+
+label_hook() {
+    LOCAL_WEB_PORT="${LOCAL_WEB_PORT:-80}"
+}
+
+template_hook() {
+    if grep -q '^reverse_proxy [^\s] [:.0-9a-e]\+:\d+$' <<< "${PARTIAL_RESULT}"
+    then
+        return 0;
+    fi
+    return 1;
+}

templates/hosts.sh

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+#!/usr/bin/env bash
+set -e
+HOST_CONF_PATH="${HOST_CONF_PATH:-/tmp/hosts}"
+RESOLVE_DOCKERHOST="${RESOLVE_DOCKERHOST:-false}"
+DOCKER_HOSTNAME_VAR="${DOCKER_HOSTNAME_VAR:-LOCAL_WEB_HOST}"
+
+if [ -f "${HOST_CONF_PATH}" ]
+then
+    WRAP_START=$(grep -ve "# Added by hostman$" "${HOST_CONF_PATH}")
+    WRAP_START+="\n"
+else
+    printf "[WARN]: No such file or directory: %s\n" "${HOST_CONF_PATH}"
+    printf "Creating %s" "${HOST_CONF_PATH}"
+    touch "${HOST_CONF_PATH}"
+fi
+
+if ! $RESOLVE_DOCKERHOST
+then
+    TEMPLATE='127.0.0.1 '
+else
+    TEMPLATE='$LOCAL_IP '
+fi
+
+TEMPLATE="${TEMPLATE}\${${DOCKER_HOSTNAME_VAR}} # Added by hostman"
+
+# Allow overriding out for debugging and testing purposs
+if [ -z "${HOST_CONF_OUT+.}" ]
+then
+    OUT="${HOST_CONF_PATH}"
+else
+    OUT="${HOST_CONF_OUT}"
+fi
+
+check_template() {
+    if grep -q '^[:.0-9a-e]\+ [^\s]\+ # Added by hostman$' <<< "${PARTIAL_RESULT}"
+    then
+        return 0;
+    fi
+    return 1;
+}

templates/sqlproxy.sh

@@ -0,0 +1,6 @@
+#!/usr/bin/env bash
+set -e
+WRAP_START='[\n'
+TEMPLATE='  { type: "${LOCAL_DB_TYPE}", user: "${LOCAL_DB_USER}", password: "${LOCAL_DB_PASSWORD}", host: "${LOCAL_DB_HOST}", port: "${LOCAL_DB_PORT}" }'
+SEPARATOR=',\n'
+WRAP_END='\n]'