buildkit/cache/fsutil.go

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package cache
import (
"context"
"io/ioutil"
"github.com/containerd/continuity/fs"
"github.com/moby/buildkit/snapshot"
)
func ReadFile(ctx context.Context, ref ImmutableRef, p string) ([]byte, error) {
mount, err := ref.Mount(ctx, true)
if err != nil {
return nil, err
}
lm := snapshot.LocalMounter(mount)
root, err := lm.Mount()
if err != nil {
return nil, err
}
defer func() {
if lm != nil {
lm.Unmount()
}
}()
fp, err := fs.RootPath(root, p)
if err != nil {
return nil, err
}
dt, err := ioutil.ReadFile(fp)
if err != nil {
return nil, err
}
if err := lm.Unmount(); err != nil {
return nil, err
}
lm = nil
return dt, err
}