| // Copyright (c) HashiCorp, Inc. |
| // SPDX-License-Identifier: BUSL-1.1 |
| |
| package copy |
| |
| import ( |
| "io" |
| "os" |
| ) |
| |
| // CopyFile copies the contents of the file named src to the file named |
| // by dst. The file will be created if it does not already exist. If the |
| // destination file exists, all it's contents will be replaced by the contents |
| // of the source file. The file mode will be copied from the source and |
| // the copied data is synced/flushed to stable storage. |
| func CopyFile(src, dst string) (err error) { |
| in, err := os.Open(src) |
| if err != nil { |
| return |
| } |
| defer in.Close() |
| |
| out, err := os.Create(dst) |
| if err != nil { |
| return |
| } |
| defer func() { |
| if e := out.Close(); e != nil { |
| err = e |
| } |
| }() |
| |
| _, err = io.Copy(out, in) |
| if err != nil { |
| return |
| } |
| |
| err = out.Sync() |
| if err != nil { |
| return |
| } |
| |
| si, err := os.Stat(src) |
| if err != nil { |
| return |
| } |
| err = os.Chmod(dst, si.Mode()) |
| if err != nil { |
| return |
| } |
| |
| return |
| } |
