Moved to _dev

bash/docker-volumes.sh

@@ -0,0 +1,65 @@
+#!/bin/bash
+#
+# The docker-export and docker-commit/docker-save commands do not save the container volumes.
+# Use this script to save and load the container volumes.
+#
+# v1.8 by Ricardo Branco
+#
+# NOTES:
+#  + This script could have been written in Python or Go, but the tarfile module and the tar package
+#    lack support for writing sparse files.
+#  + We use the Ubuntu 22.04 Docker image with tar v1.29 that uses SEEK_DATA/SEEK_HOLE to manage sparse files.
+#
+
+verbose=""
+if [[ $1 == "-v" || $1 == "--verbose" ]] ; then
+	verbose="-v"
+	shift
+fi
+
+if [[ $# -ne 3 || ! $2 =~ ^(save|load)$ ]] ; then
+	echo "Usage: $0 [-v|--verbose] CONTAINER [save|load] TARBALL" >&2
+	exit 1
+fi
+
+IMAGE="ubuntu:22.04"
+
+# Set DOCKER=podman if you want to use podman.io instead of docker
+DOCKER=${DOCKER:-"docker"}
+
+get_volumes () {
+	$DOCKER inspect --type container -f '{{range .Mounts}}{{printf "%v\x00" .Destination}}{{end}}' "$CONTAINER" | head -c -1 | sort -uz
+}
+
+save_volumes () {
+	if [ -f "$TAR_FILE" ] ; then
+		echo "ERROR: $TAR_FILE already exists" >&2
+		exit 1
+	fi
+	umask 077
+	# Create a void tar file to avoid mounting its directory as a volume
+	touch -- "$TAR_FILE"
+	tmp_dir=$(mktemp -du -p /)
+	get_volumes | $DOCKER run --rm -i --volumes-from "$CONTAINER" -e LC_ALL=C.UTF-8 -v "$TAR_FILE:/${tmp_dir}/${TAR_FILE##*/}" $IMAGE tar -c -a $verbose --null -T- -f "/${tmp_dir}/${TAR_FILE##*/}"
+}
+
+load_volumes () {
+	if [ ! -f "$TAR_FILE" ] ; then
+		echo "ERROR: $TAR_FILE doesn't exist in the current directory" >&2
+		exit 1
+	fi
+	tmp_dir=$(mktemp -du -p /)
+	$DOCKER run --rm --volumes-from "$CONTAINER" -e LC_ALL=C.UTF-8 -v "$TAR_FILE:/${tmp_dir}/${TAR_FILE##*/}":ro $IMAGE tar -xp $verbose -S -f "/${tmp_dir}/${TAR_FILE##*/}" -C / --overwrite
+}
+
+CONTAINER="$1"
+TAR_FILE=$(readlink -f "$3")
+
+set -e
+
+case "$2" in
+	save)
+		save_volumes ;;
+	load)
+		load_volumes ;;
+esac