66 lines
1.5 KiB
Go
66 lines
1.5 KiB
Go
/*
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Copyright 2016 The Kubernetes Authors All rights reserved.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package hyperkit
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import (
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"fmt"
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"io"
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"os"
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"strings"
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"github.com/hooklift/iso9660"
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)
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// ExtractFile extracts a file from an ISO
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func ExtractFile(isoPath, srcPath, destPath string) error {
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iso, err := os.Open(isoPath)
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if err != nil {
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return err
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}
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defer iso.Close()
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r, err := iso9660.NewReader(iso)
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if err != nil {
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return err
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}
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f, err := findFile(r, srcPath)
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if err != nil {
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return err
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}
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dst, err := os.Create(destPath)
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if err != nil {
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return err
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}
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defer dst.Close()
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_, err = io.Copy(dst, f.Sys().(io.Reader))
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return err
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}
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func findFile(r *iso9660.Reader, path string) (os.FileInfo, error) {
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// Look through the ISO for a file with a matching path.
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for f, err := r.Next(); err != io.EOF; f, err = r.Next() {
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// For some reason file paths in the ISO sometimes contain a '.' character at the end, so strip that off.
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if strings.TrimSuffix(f.Name(), ".") == path {
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return f, nil
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}
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}
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return nil, fmt.Errorf("unable to find file %s", path)
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}
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