Check file permissions before installing

src/bin/juliainstaller.rs

@@ -388,6 +388,43 @@ pub fn main() -> Result<()> {
  return Ok(());
  }
 
+ if install_choices.modifypath {
+ // Now check whether we have the necessary permissions for all the files
+ // we want to modify.
+
+ let paths = find_shell_scripts_to_be_modified(false)?;
+
+ let mut failed_paths: Vec<PathBuf> = Vec::<PathBuf>::new();
+
+ for cur_path in paths {
+ let file_result = std::fs::OpenOptions::new()
+ .read(true)
+ .write(true)
+ .open(&cur_path);
+
+ if file_result.is_err() {
+ failed_paths.push(cur_path.clone());
+ }
+ }
+
+ if failed_paths.len() > 0 {
+ println!("Juliaup needs to modify a number of existing files on your");
+ println!("system, but is unable to edit some of these files. Most likely");
+ println!("this is caused by incorrect permissions on these files. The");
+ println!("following files could not be edited:");
+ for cur_path in failed_paths {
+ println!(" {}", cur_path.display());
+ }
+ println!("You can find more help with this problem at");
+ println!(
+ " https://github.com/JuliaLang/juliaup/wiki/Permission-problems-during-setup"
+ );
+ println!();
+
+ return Ok(());
+ }
+ }
+
  let juliaupselfbin = install_choices.install_location.join("bin");
 
  trace!("Set juliaupselfbin to `{:?}`", juliaupselfbin);