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Fix calculation of relative path for symlink on docker save 

Relative paths are now calculated from a base path rather than from the file path, which gets treated like a directory.
Symlinks will now properly point to the file as "../<layer dir>/layer.tar" rather the incorrect "../../<layer dir>/layer.tar".

Fixes #24951

Signed-off-by: Derek McGowan <derek@mcgstyle.net> (github: dmcgowan)
(cherry picked from commit 5487881e120e927d7210adf0cb09181092c3ab35)
Signed-off-by: Tibor Vass <tibor@docker.com>
This commit is contained in:
Derek McGowan 2016-07-25 13:28:10 -07:00 committed by Tibor Vass
parent 25cf7999fa
commit e111f0c7b2
1 changed files with 1 additions and 1 deletions
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2
image/tarexport/save.go
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@ -307,7 +307,7 @@ func (s *saveSession) saveLayer(id layer.ChainID, legacyImg image.V1Image, creat
defer layer.ReleaseAndLog(s.ls, l)
if oldPath, exists := s.diffIDPaths[l.DiffID()]; exists {
relPath, err := filepath.Rel(layerPath, oldPath)
relPath, err := filepath.Rel(outDir, oldPath)
if err != nil {
return distribution.Descriptor{}, err
}