Function std::fs::copy 1.0.0
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pub fn copy<P: AsRef<Path>, Q: AsRef<Path>>(from: P, to: Q) -> Result<u64>
Copies the contents of one file to another. This function will also copy the permission bits of the original file to the destination file.
This function will overwrite the contents of to.
Note that if from and to both point to the same file, then the file
will likely get truncated by this operation.
On success, the total number of bytes copied is returned and it is equal to
the length of the to file as reported by metadata.
Platform-specific behavior
This function currently corresponds to the open function in Unix
with O_RDONLY for from and O_WRONLY, O_CREAT, and O_TRUNC for to.
O_CLOEXEC is set for returned file descriptors.
On Windows, this function currently corresponds to CopyFileEx. Alternate
NTFS streams are copied but only the size of the main stream is returned by
this function.
Note that, this may change in the future.
Errors
This function will return an error in the following situations, but is not limited to just these cases:
- The
frompath is not a file. - The
fromfile does not exist. - The current process does not have the permission rights to access
fromor writeto.
Examples
use std::fs; fs::copy("foo.txt", "bar.txt")?; // Copy foo.txt to bar.txtRun