From c614ea122f445e456ae2ca03e903eaf3bbff739e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Alexander=20Sch=C3=A4ferdiek?= <alexander@schaeferdiek.eu>
Date: Mon, 9 Sep 2019 20:20:09 +0200
Subject: [PATCH] Add a docker-compose update script which iterates through a
 directory where all subfolders contain a docker-compose.yml file

---
 usr/local/bin/docker_compose_update           | 124 ++++++++++++++++++
 .../.docker_compose_update.conf               |   1 +
 2 files changed, 125 insertions(+)
 create mode 100755 usr/local/bin/docker_compose_update
 create mode 100644 usr/share/doc/docker_compose_update/.docker_compose_update.conf

diff --git a/usr/local/bin/docker_compose_update b/usr/local/bin/docker_compose_update
new file mode 100755
index 0000000..cebd83a
--- /dev/null
+++ b/usr/local/bin/docker_compose_update
@@ -0,0 +1,124 @@
+#!/usr/bin/env bash
+
+# usage
+usage() {
+USAGE=$(cat <<EOF
+Usage: docker_compose_update [CONFIG_FILE (absolute path)]
+
+If no CONFIG_FILE is given, HOME/.docker_compose_update.conf is used. This fallback option
+has to exist or the script will exit.
+
+Configuration can be done in any file and any pre-defined variable can be overwritten.
+
+The following are at least required for the script to work:
+- DOCKER_COMPOSE_UPDATE_BASEDIR="/root/deployments" // where all docker stacks are located in their own sub-folders
+- DOCKER_COMPOSE_UPDATE_IGNORES=("mailcow") // folder names which will be ignored and not be updated, at least () is required
+- DOCKER_COMPOSE_UPDATE_COMMANDS[aDirectoryName]="./callFancyScriptInDirectory" // use another command to update, multiple possible. 
+Example: accessor has to match the folder, e.g. <baseDir>/aDirectoryName will use command "./callFancyScriptInDirectory" when changing directory into it.
+- DOCKER_COMPOSE_UPDATE_COMMAND="sudo docker-compose down; sudo docker-compose pull; sudo docker-compose up -d;" // the default update command for deployments
+- DOCKER_COMPOSE_UPDATE_FAIL_ON_UPDATE_ERROR="false" // if set to true, script fails if at least one update procedure failed
+
+You can copy this script to '/usr/local/bin' and use create a custom CONFIG_FILE as user. Examples can be found in '/usr/share/doc/<scriptname>'.
+EOF
+)
+	echo "$USAGE";
+}
+
+set -e;
+
+declare -A DOCKER_COMPOSE_UPDATE_COMMANDS;
+
+# check for config file
+source_config() {
+	local config=$1;
+	local configFallback=$2;
+
+	if [[ ! -f "$config" ]]; then
+		if [[ ! -f "$configFallback" ]]; then
+			echo "No config file specified and could not find default in '$configFallback'!";
+			echo "";
+			usage;
+			exit 1;
+		else
+			config=$configFallback;
+		fi
+	fi
+
+	set -a;
+	source "$config";
+	set +a;
+}
+apply_defaults() {
+    [[ -z ${DOCKER_COMPOSE_UPDATE_IGNORES} ]] && DOCKER_COMPOSE_UPDATE_IGNORES=();
+	[[ -z ${DOCKER_COMPOSE_UPDATE_COMMAND} ]] && DOCKER_COMPOSE_UPDATE_COMMAND="docker-compose down; docker-compose pull; docker-compose up -d;"
+	[[ -z ${DOCKER_COMPOSE_UPDATE_FAIL_ON_UPDATE_ERROR} ]] && DOCKER_COMPOSE_UPDATE_FAIL_ON_UPDATE_ERROR="false";
+}
+check_required() {
+    if [[ -z ${DOCKER_COMPOSE_UPDATE_BASEDIR} ]]; then
+    	echo "DOCKER_COMPOSE_UPDATE_BASEDIR is required"
+        exit 1;
+    fi
+    if [[ -z ${DOCKER_COMPOSE_UPDATE_COMMAND} ]]; then
+    	echo "DOCKER_COMPOSE_UPDATE_COMMAND is required"
+        exit 1;
+    fi
+}
+
+# check requirements
+CONFIG_FILE="$1";
+FALLBACK_CONFIG_FILE="${HOME}/.docker_compose_update.conf";
+source_config "${CONFIG_FILE}" "${FALLBACK_CONFIG_FILE}";
+apply_defaults;
+check_required;
+
+# DO NOT TOUCH BELOW
+currentDir=$(pwd)
+cd "${DOCKER_COMPOSE_UPDATE_BASEDIR}";
+
+for dir in *; do
+    if [ -d "${dir}" ]; then
+    	basename=$(basename "${dir}")
+
+    	ignore=false;
+    	for ignorePattern in "${DOCKER_COMPOSE_UPDATE_IGNORES[@]}"; do
+    		if [[ "${basename}" == *"${ignorePattern}"* ]]; then
+    			ignore=true;
+			fi
+		done
+
+		if [[ "${ignore}" == "true" ]]; then
+			echo "Ignoring '${basename}'";
+			continue;
+		fi
+
+    	echo "Handling '${basename}'";
+
+		updateCommand=""
+    	for cmd in "${!DOCKER_COMPOSE_UPDATE_COMMANDS[@]}"; do
+    		if [[ "${cmd}" == "${basename}" ]]; then
+    			updateCommand="${DOCKER_COMPOSE_UPDATE_COMMANDS[$cmd]}";
+			fi
+    	done
+        
+        if [[ -n "${updateCommand}" ]]; then
+        	echo "Using custom command '${updateCommand}'";
+    	else
+    		updateCommand="${DOCKER_COMPOSE_UPDATE_COMMAND}";
+    		echo "Using command '${DOCKER_COMPOSE_UPDATE_COMMAND}'";
+    	fi
+
+    	cd "${basename}";
+
+    	if [[ "${DOCKER_COMPOSE_UPDATE_FAIL_ON_UPDATE_ERROR}" == "false" ]]; then
+    		set +e;
+		fi
+    	
+    	res=$(eval "${updateCommand}")
+
+    	if [[ "${DOCKER_COMPOSE_UPDATE_FAIL_ON_UPDATE_ERROR}" == "false" ]]; then
+    		set -e;
+		fi
+    	cd "../";
+    	echo "";
+    fi
+done
\ No newline at end of file
diff --git a/usr/share/doc/docker_compose_update/.docker_compose_update.conf b/usr/share/doc/docker_compose_update/.docker_compose_update.conf
new file mode 100644
index 0000000..f44e8c9
--- /dev/null
+++ b/usr/share/doc/docker_compose_update/.docker_compose_update.conf
@@ -0,0 +1 @@
+DOCKER_COMPOSE_UPDATE_BASEDIR="/root/deployments"