From 688a6a85459422a1f61af5d1f07f76bd877dbbd4 Mon Sep 17 00:00:00 2001
From: Harm Verhagen <harm@symeon.nl>
Date: Fri, 17 Feb 2023 08:37:57 +0100
Subject: [PATCH] Fix docker_clone_volume.sh to preserve hard-links

When using docker_clone_volume.sh,  I found that when copying a volume with influxdb data,
the clones image was bigger than the original.

cause: alpine base image contains a cp version (busybox) which  does _not_ preserve
hardlinks, even with the -a option.

This is fixed by using an ubuntu base image instead of alpine.

downside: ubuntu image is larger than alpine.

Source volume:

 influxdb_data               380.2 MB

Before:

 influxdb_data.bak           443.5 MB

After:

 influxdb_data.ubuntu.bak    380.2 MB
---
 docker_clone_volume.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docker_clone_volume.sh b/docker_clone_volume.sh
index ce46efc..c34ef71 100755
--- a/docker_clone_volume.sh
+++ b/docker_clone_volume.sh
@@ -47,4 +47,4 @@ docker run --rm \
            -t \
            -v $1:/from \
            -v $2:/to \
-           alpine ash -c "cd /from ; cp -av . /to"
+           ubuntu bash -c "cd /from ; cp -av . /to"