single place for copy file

src/files/mkroot_files.rs

@@ -1,4 +1,4 @@
-use std::fs::{copy as fscopy, File, Permissions};
+use std::fs::{File, Permissions};
 use std::os::unix::fs::PermissionsExt;
 use std::path::PathBuf;
 use std::process::Command;
@@ -7,7 +7,7 @@ use regex::Regex;
 
 use crate::config::Config;
 use crate::error::*;
-use crate::util::set_perms;
+use crate::util::{copy_file, set_perms};
 
 pub struct Files {
 	pub bins: Vec<PathBuf>,
@@ -216,16 +216,8 @@ impl Files {
 					println!("Copying {} to {}", &f.display(), &t.display());
 				}
 
-				if let Err(e) = fscopy(&f, &t) {
-					return Err(MkrootError::from(format!(
-						"Error copying file from {} to {}: {}",
-						&f.display(),
-						&t.display(),
-						e
-					)));
-				} else {
+				copy_file(&f, &t)?;
 				set_perms(&t, Permissions::from_mode(mode))?;
-				}
 			} else if verbose {
 				println!("Skipping {}", &f.display());
 			}

src/util/copy_file.rs

@@ -0,0 +1,17 @@
+use std::fs::copy;
+use std::path::PathBuf;
+
+use crate::error::*;
+
+pub fn copy_file(src: &PathBuf, dst: &PathBuf) -> MkrootResult<()> {
+	if let Err(e) = copy(&src, &dst) {
+		return Err(MkrootError::from(format!(
+			"Error copying file from {} to {}: {}",
+			&src.display(),
+			&dst.display(),
+			e
+		)));
+	}
+
+	Ok(())
+}

src/util/mod.rs

@@ -1,3 +1,5 @@
+mod copy_file;
 mod perms;
 
+pub use crate::util::copy_file::copy_file;
 pub use crate::util::perms::*;