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99 lines
1.9 KiB
Bash
Executable File
99 lines
1.9 KiB
Bash
Executable File
#! /usr/bin/env bash
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set -e
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abs_dirname() {
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local path="$1"
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local cwd
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cwd="$(pwd)"
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while [ -n "$path" ]; do
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cd "${path%/*}" 2> /dev/null
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local name="${path##*/}"
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path="$(resolve_link "$name" || true)"
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done
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pwd
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cd "$cwd"
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}
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abs_path() {
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local path="$1"
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echo "$(cd "$(abs_dirname "$path")" && pwd)/$(basename "$path")"
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}
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resolve_link() {
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$(type -p greadlink readlink | head -1) "$1"
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}
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resolve_dest() {
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local dest="$1"
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if [ -z "$dest" ]; then
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dest="$(pwd)/${volname}_$(date '+%Y-%m-%d_%H-%M-%S').tar.gz"
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fi
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dest="$(abs_path "$dest")"
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if [ -f "$dest" ]; then
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echo "ERROR: \"${dest}\" already exists." 1>&2
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exit 1
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fi
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echo "$dest"
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}
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resolve_dest_dir() {
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local dest="$1"
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local dir
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dir="$(dirname "$dest")"
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if [ ! -d "$dir" ]; then
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echo "ERROR: \"$dir\" is not a directory."
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fi
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echo "$dir"
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}
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help() {
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echo "usage: docker-volume-backup <volume> [<output-filename>]"
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echo ""
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echo "Backs up contents of a Docker volume to a gzipped tar archive."
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echo ""
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echo "Arguments:"
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echo " <volume> - Name of Docker volume to backup."
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echo " <output-filename> - Optional argument to specify output filename."
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echo " Defaults to: ./<volume>_<date>_<time>.tar.gz"
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}
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main() {
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local volname="$1"
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local dest="$2"
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local dest_dir
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if [ -z "$volname" ]; then
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help 1>&2
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exit 1
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fi
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if ! docker volume inspect "$volname" &> /dev/null; then
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echo "ERROR: Volume \"${volname}\" does not exist." 1>&2
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exit 1
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fi
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dest="$(resolve_dest "$dest")"
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dest_dir="$(resolve_dest_dir "$dest")"
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dest_file="$(basename "$dest")"
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echo "Starting volume backup to: ${dest}"
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docker run --rm \
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--volume "${volname}:/source/${volname}" \
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--volume "${dest_dir}:/target" \
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alpine:latest \
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sh -c "cd /source && tar -cvzf \"/target/${dest_file}\" \"${volname}\""
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echo "Volume \"${volname}\" was backed up to: ${dest}"
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}
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main "$@"
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