66 lines
1.9 KiB
Go
66 lines
1.9 KiB
Go
// Copyright 2016-2018, Pulumi Corporation.
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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 fsutil
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import (
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"io/ioutil"
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"os"
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"path/filepath"
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)
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// CopyFile is a braindead simple function that copies a src file to a dst file. Note that it is not general purpose:
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// it doesn't handle symbolic links, it doesn't try to be efficient, it doesn't handle copies where src and dst overlap,
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// and it makes no attempt to preserve file permissions. It is what we need for this utility package, no more, no less.
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func CopyFile(dst string, src string, excl map[string]bool) error {
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info, err := os.Lstat(src)
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if os.IsNotExist(err) {
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return nil
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} else if err != nil {
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return err
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} else if excl[info.Name()] {
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return nil
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}
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if info.IsDir() {
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// Recursively copy all files in a directory.
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files, err := ioutil.ReadDir(src)
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if err != nil {
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return err
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}
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for _, file := range files {
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name := file.Name()
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copyerr := CopyFile(filepath.Join(dst, name), filepath.Join(src, name), excl)
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if copyerr != nil {
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return copyerr
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}
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}
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} else if info.Mode().IsRegular() {
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// Copy files by reading and rewriting their contents. Skip symlinks and other special files.
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data, err := ioutil.ReadFile(src)
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if err != nil {
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return err
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}
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dstdir := filepath.Dir(dst)
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if err = os.MkdirAll(dstdir, 0700); err != nil {
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return err
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}
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if err = ioutil.WriteFile(dst, data, info.Mode()); err != nil {
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return err
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}
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}
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return nil
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}
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