containerd/vendor/github.com/docker/docker/pkg/archive/whiteouts.go
Ian Campbell 8c6ba35038 Implement volume copy up.
This pulls in and uses github.com/docker/docker/pkg/chrootarchive for the
actual copy up which is some battle hardened code to unpack avoiding things
like symlink traversal security issues.

However it does pull in a pretty huge pile of vendoring, including
github.com/docker/docker/pkg/reexec which we must then call at startup. It's
not immediately clear that this tradeoff is the correct one.

Signed-off-by: Ian Campbell <ijc@docker.com>
2017-09-20 09:52:27 +01:00

24 lines
1.1 KiB
Go

package archive
// Whiteouts are files with a special meaning for the layered filesystem.
// Docker uses AUFS whiteout files inside exported archives. In other
// filesystems these files are generated/handled on tar creation/extraction.
// WhiteoutPrefix prefix means file is a whiteout. If this is followed by a
// filename this means that file has been removed from the base layer.
const WhiteoutPrefix = ".wh."
// WhiteoutMetaPrefix prefix means whiteout has a special meaning and is not
// for removing an actual file. Normally these files are excluded from exported
// archives.
const WhiteoutMetaPrefix = WhiteoutPrefix + WhiteoutPrefix
// WhiteoutLinkDir is a directory AUFS uses for storing hardlink links to other
// layers. Normally these should not go into exported archives and all changed
// hardlinks should be copied to the top layer.
const WhiteoutLinkDir = WhiteoutMetaPrefix + "plnk"
// WhiteoutOpaqueDir file means directory has been made opaque - meaning
// readdir calls to this directory do not follow to lower layers.
const WhiteoutOpaqueDir = WhiteoutMetaPrefix + ".opq"