Revert "overwrite boot partition to modify cmdline"

This reverts commit ce337ea566a7cda7c9a89c4080fa24a15256a1ed.

1 files changed, 2 insertions, 21 deletions

diff --git a/src/main.rs b/src/main.rs
index 89db44c..c07af1a 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -261,28 +261,9 @@ fn validate_credentials(user_id: &str, user_password: &str) -> io::Result<bool>
     ))
 }
 
-fn replace_slice<T>(src: &mut [T], old: &[T], new: &[T])
-where
-    T: Clone + PartialEq,
-{
-    let iteration = if src.starts_with(old) {
-        src[..old.len()].clone_from_slice(new);
-        old.len()
-    } else {
-        1
-    };
-
-    if src.len() > old.len() {
-        replace_slice(&mut src[iteration..], old, new);
-    }
-}
-
 fn modify_cmdline(old: &str, new: &str) -> Result<()> {
-    let boot = boot_dev()?;
-
-    let mut cmdline = fs::read(boot)?;
-    replace_slice(&mut cmdline, old.as_bytes(), new.as_bytes());
-    fs::write(boot, cmdline)?;
+    let cmdline = fs::read_to_string("/boot/cmdline.txt")?;
+    fs::write("/boot/cmdline.txt", cmdline.replace(old, new))?;
 
     nix::unistd::sync();
     Ok(())