daa1ea522b
Details about CimFs project are discussed in #8346 Signed-off-by: Amit Barve <ambarve@microsoft.com>
42 lines
1.4 KiB
Go
42 lines
1.4 KiB
Go
//go:build windows
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package cim
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import (
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"os"
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"path/filepath"
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)
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const (
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// name of the directory in which cims are stored
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cimDir = "cim-layers"
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)
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// Usually layers are stored at ./root/io.containerd.snapshotter.v1.windows/snapshots/<layerid>. For cimfs we
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// must store all layer cims in the same directory (for forked cims to work). So all cim layers are stored in
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// /root/io.containerd.snapshotter.v1.windows/snapshots/cim-layers. And the cim file representing each
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// individual layer is stored at /root/io.containerd.snapshotter.v1.windows/snapshots/cim-layers/<layerid>.cim
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// CimName is the filename (<layerid>.cim) of the file representing the cim
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func GetCimNameFromLayer(layerPath string) string {
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return filepath.Base(layerPath) + ".cim"
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}
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// CimPath is the path to the CimDir/<layerid>.cim file that represents a layer cim.
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func GetCimPathFromLayer(layerPath string) string {
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return filepath.Join(GetCimDirFromLayer(layerPath), GetCimNameFromLayer(layerPath))
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}
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// CimDir is the directory inside which all cims are stored.
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func GetCimDirFromLayer(layerPath string) string {
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dir := filepath.Dir(layerPath)
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return filepath.Join(dir, cimDir)
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}
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// IsCimLayer returns `true` if the layer at path `layerPath` is a cim layer. Returns `false` otherwise.
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func IsCimLayer(layerPath string) bool {
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cimPath := GetCimPathFromLayer(layerPath)
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_, err := os.Stat(cimPath)
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return (err == nil)
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}
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