mirror of
https://github.com/containers/skopeo.git
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c399909f04
Dependabot was apparently not picking these up (and several haven't had a release for a long time anyway). Also move from github.com/go-check/check to its newly declared (and go.mod-enforced) name gopkg.in/check.v1. Signed-off-by: Miloslav Trmač <mitr@redhat.com>
70 lines
1.8 KiB
Go
70 lines
1.8 KiB
Go
// Copyright 2016 The Linux Foundation
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package image
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import (
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"io"
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"io/ioutil"
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"net/http"
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"os"
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"github.com/pkg/errors"
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)
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// supported autodetection types
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const (
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TypeImageLayout = "imageLayout"
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TypeImage = "image"
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TypeImageZip = "imageZip"
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TypeManifest = "manifest"
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TypeImageIndex = "imageIndex"
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TypeConfig = "config"
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)
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// Autodetect detects the validation type for the given path
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// or an error if the validation type could not be resolved.
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func Autodetect(path string) (string, error) {
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fi, err := os.Stat(path)
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if err != nil {
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return "", errors.Wrapf(err, "unable to access path") // err from os.Stat includes path name
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}
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if fi.IsDir() {
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return TypeImageLayout, nil
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}
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f, err := os.Open(path) // nolint: errcheck, gosec
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if err != nil {
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return "", errors.Wrap(err, "unable to open file") // os.Open includes the filename
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}
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defer f.Close()
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buf, err := ioutil.ReadAll(io.LimitReader(f, 512)) // read some initial bytes to detect content
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if err != nil {
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return "", errors.Wrap(err, "unable to read")
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}
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mimeType := http.DetectContentType(buf)
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switch mimeType {
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case "application/x-gzip", "application/x-rar-compressed", "application/octet-stream":
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return TypeImage, nil
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case "application/zip":
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return TypeImageZip, nil
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}
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return "", errors.New("unknown file type")
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}
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