68 lines
1.6 KiB
Go
68 lines
1.6 KiB
Go
// Filesystem storage backend for Nixery.
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package storage
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import (
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"fmt"
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"io"
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"net/http"
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"os"
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"path"
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log "github.com/sirupsen/logrus"
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)
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type FSBackend struct {
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path string
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}
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func NewFSBackend(p string) (*FSBackend, error) {
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p = path.Clean(p)
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err := os.MkdirAll(p, 0755)
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if err != nil {
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return nil, fmt.Errorf("failed to create storage dir: %s", err)
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}
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return &FSBackend{p}, nil
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}
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func (b *FSBackend) Name() string {
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return fmt.Sprintf("Filesystem (%s)", b.path)
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}
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func (b *FSBackend) Persist(key string, f func(io.Writer) (string, int64, error)) (string, int64, error) {
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full := path.Join(b.path, key)
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dir := path.Dir(full)
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err := os.MkdirAll(dir, 0755)
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if err != nil {
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log.WithError(err).WithField("path", dir).Error("failed to create storage directory")
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return "", 0, err
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}
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file, err := os.OpenFile(full, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0644)
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if err != nil {
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log.WithError(err).WithField("file", full).Error("failed to write file")
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return "", 0, err
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}
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defer file.Close()
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return f(file)
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}
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func (b *FSBackend) Fetch(key string) (io.ReadCloser, error) {
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full := path.Join(b.path, key)
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return os.Open(full)
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}
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func (b *FSBackend) Move(old, new string) error {
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return os.Rename(path.Join(b.path, old), path.Join(b.path, new))
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}
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func (b *FSBackend) ServeLayer(digest string, w http.ResponseWriter) error {
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// http.Serve* functions attempt to be a lot more clever than
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// I want, but I also would prefer to avoid implementing error
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// translation myself - thus a fake request is created here.
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req := http.Request{Method: "GET"}
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http.ServeFile(w, &req, path.Join(b.path, "sha256:"+digest))
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return nil
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}
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