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LCOW: Regular mount if only one layer #36052

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Jan 25, 2018
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LCOW: Regular mount if only one layer #36052

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LCOW: Regular mount if only one layer 
Signed-off-by: John Howard <jhoward@microsoft.com>
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John Howard committed Jan 18, 2018
commit 420dc4eeb48b155e6b83fccf62f8727ce4bf5b21
5 changes: 4 additions & 1 deletion daemon/graphdriver/lcow/lcow_svm.go
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Original file line number Diff line number Diff line change
Expand Up @@ -299,7 +299,10 @@ func (svm *serviceVM) createUnionMount(mountName string, mvds ...hcsshim.MappedV
}

var cmd string
if mvds[0].ReadOnly {
if len(mvds) == 1 {
// `FROM SCRATCH` case and the only layer. No overlay required.
cmd = fmt.Sprintf("mount %s %s", mvds[0].ContainerPath, mountName)
} else if mvds[0].ReadOnly {
// Readonly overlay
cmd = fmt.Sprintf("mount -t overlay overlay -olowerdir=%s %s",
strings.Join(lowerLayers, ","),
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