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107 lines
2.2 KiB
Bash
Executable File
107 lines
2.2 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_archive() {
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local archive="$1"
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archive="$(abs_path "$archive")"
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if [ ! -f "$archive" ]; then
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echo "ERROR: \"${archive}\" is not a file." 1>&2
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exit 1
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fi
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echo "$archive"
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}
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resolve_volname () {
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local archive="$1"
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local file
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local dir
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file="$(basename "$archive")"
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dir="$(dirname "$archive")"
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docker run --rm \
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--volume "${dir}:/source" \
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alpine:latest \
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sh -c "tar --exclude=\"*/*/*\" -tzf \"/source/${file}\" \
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| grep -v '^[^/]\+/[^/]\+$' | sed s'/.$//'" 2>/dev/null
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}
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help () {
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echo "usage: docker-volume-restore <archive> [<volume-name>]"
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echo ""
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echo "Input <archive> should be a *.tar.gz producded by the"
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echo "docker-volume-backup command."
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}
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main () {
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local archive="$1"
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local volname="$2"
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local archive_volname
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local archive_file
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local archive_dir
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if [ -z "$archive" ]; then
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help 1>&2
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exit 1
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fi
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archive="$(resolve_archive "$archive")"
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archive_file="$(basename "$archive")"
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archive_dir="$(dirname "$archive")"
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archive_volname="$(resolve_volname "$archive")"
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if [ "$(echo "$archive_volname" | wc -l)" -gt 1 ]; then
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echo "ERROR: \"$archive_file\" has more than one root directory." 1>&2
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exit 1
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fi
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if [ -z "$volname" ]; then
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volname="$archive_volname"
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fi
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if docker volume inspect "$volname" &>/dev/null; then
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echo "ERROR: Volume \"${volname}\" already exists." 1>&2
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exit 1
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fi
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echo "Restoring volume ${volume} from: ${archive_file}"
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docker volume create "$volname"
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docker run --rm \
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--volume "${volname}:/target" \
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--volume "${archive_dir}:/source" \
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alpine:latest \
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sh -c "cd /target && tar --strip-components=1 \
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-xvzf \"/source/${archive_file}\""
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echo "Volume \"${volname}\" was restored from: ${archive_file}"
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}
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main "$@"
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