vbatts/pkg
1
0
Fork 0
Code Pull requests Releases Activity

Add constants for AUFS whiteout files

Browse source 
Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
This commit is contained in:
Tonis Tiigi 2015-09-29 10:18:28 -07:00
parent 4c53da8f9a
commit bd780a0bb0
3 changed files with 34 additions and 11 deletions
Download patch file Download diff file Expand all files Collapse all files

23
archive/whiteouts.go Normal file
View file

@ -0,0 +1,23 @@
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 remoing an actaul 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"