From 84dbc469dfaa66b60f8625599b7e871badcc8d40 Mon Sep 17 00:00:00 2001
From: "Kevin Veen-Birkenbach [aka. Frantz]" <kevin@veen.world>
Date: Mon, 12 Oct 2020 11:35:02 +0200
Subject: [PATCH] Refactored and implemented versioning

---
 scripts/backup.sh | 39 +++++++++++++++++++++++++--------------
 1 file changed, 25 insertions(+), 14 deletions(-)

diff --git a/scripts/backup.sh b/scripts/backup.sh
index 780fc6d..6494f57 100644
--- a/scripts/backup.sh
+++ b/scripts/backup.sh
@@ -1,22 +1,33 @@
 #!/bin/bash
-host_backup_folder_path="$HOME/Backup/docker/"
-docker_backup_folder_path="/Backup/docker/"
-mkdir -p "$host_backup_folder_path"
+
+backup_time="$(date '+%Y%m%d%H%M%S')"
+docker_backups_mount="/Backups/"
+native_backups_mount_prefix="$HOME"
+native_backups_mount="$native_backups_mount_prefix$docker_backups_mount"
 for docker_container_name in $(docker ps --format '{{.Names}}');
 do
-  backup_dir_base_path="$docker_backup_folder_path""archive/$(date '+%Y%m%d%H%M%S')/";
   echo "stop container: $docker_container_name" && docker stop "$docker_container_name"
-  for rsync_source_path in $(docker inspect --format '{{ range .Mounts }}{{ if eq .Type "volume" }}{{ println .Destination }}{{ end }}{{ end }}' "$docker_container_name");
+  for source_path in $(docker inspect --format '{{ range .Mounts }}{{ if eq .Type "volume" }}{{ println .Destination }}{{ end }}{{ end }}' "$docker_container_name");
   do
-    rsync_docker_destination_path="$docker_backup_folder_path""latest/""$docker_container_name$rsync_source_path";
-    rsync_docker_backup_dir_path="$backup_dir_base_path$docker_container_name$rsync_source_path";
-    echo "backup $rsync_source_path..."
-    docker run --rm --volumes-from "$docker_container_name" -v "$host_backup_folder_path:$docker_backup_folder_path" "kevinveenbirkenbach/alpine-rsync" sh -c "
-    test -d $rsync_source_path &&
-    mkdir -p $rsync_docker_destination_path &&
-    rsync -a --delete $rsync_source_path $rsync_docker_destination_path ||
-    mkdir -p $(dirname $rsync_docker_destination_path) &&
-    rsync -a --delete $rsync_source_path $(dirname $rsync_docker_destination_path)";
+    application_path="$docker_backups_mount$(cat /etc/machine-id)/docker/$docker_container_name"
+    first_destination_path="$application_path""first""$source_path";
+    latest_destination_path="$application_path""latest""$source_path";
+    backup_dir_path="$application_path""diffs/$backup_time/$source_path"
+    if [ -d "$native_backups_mount_prefix$application_path)" ]
+      then
+        echo "backup: $source_path"
+        destination_path="$latest_destination_path";
+      else
+        echo "first backup: $source_path"
+        destination_path="$first_destination_path";
+    fi
+    mkdir "$native_backups_mount_prefix$destination_path";
+    docker run --rm --volumes-from "$docker_container_name" -v "$native_backups_mount:$docker_backups_mount" "kevinveenbirkenbach/alpine-rsync" sh -c "
+    test -d $source_path &&
+    mkdir -p $destination_path &&
+    rsync -a --delete --backup-dir="$backup_dir_path" $source_path $destination_path ||
+    mkdir -p $(dirname $destination_path) &&
+    rsync -a --delete --backup-dir="$(dirname $backup_dir_path)" $source_path $(dirname $destination_path)";
   done
   echo "start container: $docker_container_name" && docker start "$docker_container_name"
 done