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[EROFS] Add a check for erofs #305

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[EROFS] Add a check for erofs #305

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11 changes: 10 additions & 1 deletion pkg/snapshot/overlay.go
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Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,7 @@
package snapshot

import (
"bytes"
"context"
"fmt"
"os"
Expand Down Expand Up @@ -1379,10 +1380,18 @@ func (o *snapshotter) blockPath(id string) string {
return filepath.Join(o.root, "snapshots", id, "block")
}

func IsErofsSupported() bool {
fs, err := os.ReadFile("/proc/filesystems")
if err != nil || !bytes.Contains(fs, []byte("\terofs\n")) {
return false
}
return true
}

func (o *snapshotter) turboOCIFsMeta(id string) (string, string) {
// TODO: make the priority order (multi-meta exists) configurable later if needed
erofsmeta := filepath.Join(o.root, "snapshots", id, "fs", "erofs.fs.meta")
if _, err := os.Stat(erofsmeta); err == nil {
if _, err := os.Stat(erofsmeta); err == nil && IsErofsSupported() {
return erofsmeta, "erofs"
}
return filepath.Join(o.root, "snapshots", id, "fs", "ext4.fs.meta"), "ext4"
Expand Down
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