actually remove the shadow line and fix a final newline

src/user/mod.rs

@@ -24,6 +24,13 @@ pub struct User {
 }
 
 impl User {
+    pub fn get_shadow(&self) -> Option<&crate::Shadow> {
+        match self.password {
+            crate::Password::Encrypted(_) => None,
+            crate::Password::Shadow(ref s) => Some(s),
+            crate::Password::Disabled => None,
+        }
+    }
     /*fn get_nth_line(content: &str, n: u32) -> (String, u64) {
         use std::io::BufRead;
         let mut cursor = std::io::Cursor::new(content);

src/user/shadow_fields.rs

@@ -40,6 +40,13 @@ impl Shadow {
     pub fn get_password(&self) -> &str {
         &self.password.password
     }
+    pub fn remove_in(&self, content: &str) -> String {
+        content
+            .split(&self.source)
+            .map(|x| x.trim())
+            .collect::<Vec<&str>>()
+            .join("\n")
+    }
 }
 
 impl Display for Shadow {

src/userlib/files.rs

@@ -85,6 +85,7 @@ impl LockedFileGuard {
         self.file
             .write_all(&new_content.into_bytes())
             .expect("Failed to write all users.");
+        let _ = self.file.write("\n".as_bytes());
         Ok(())
     }
 

src/userlib/hashes.rs

@@ -0,0 +1,37 @@
+#[allow(unused_imports)]
+use log::{debug, error, info, trace, warn};
+pub struct SourceHash {
+    hashvalue: String,
+}
+
+impl SourceHash {
+    pub fn new(src: &str) -> Self {
+        Self {
+            hashvalue: src.to_owned(),
+        }
+    }
+    pub fn has_changed(&self, new: &str) -> bool {
+        trace!(
+            "Old and new lengths: {}, {}",
+            self.hashvalue.len(),
+            new.len()
+        );
+        !self.hashvalue.eq(new)
+    }
+}
+
+pub struct Hashes {
+    pub passwd: SourceHash,
+    pub shadow: SourceHash,
+    pub group: SourceHash,
+}
+
+impl Hashes {
+    pub fn new(passwd: &str, shadow: &str, group: &str) -> Self {
+        Self {
+            passwd: SourceHash::new(passwd),
+            shadow: SourceHash::new(shadow),
+            group: SourceHash::new(group),
+        }
+    }
+}

src/userlib/mod.rs

@@ -8,6 +8,7 @@
 #![allow(clippy::non_ascii_literal)]
 
 pub mod files;
+pub mod hashes;
 
 use crate::api::GroupRead;
 use crate::api::UserRead;
@@ -19,7 +20,7 @@ use std::io::{BufReader, Read};
 
 pub struct UserDBLocal {
     source_files: files::Files,
-    source_hashes: Hashes, // to detect changes
+    source_hashes: hashes::Hashes, // to detect changes
     pub users: HashMap<String, crate::User>,
     pub groups: Vec<crate::Group>,
 }
@@ -44,7 +45,7 @@ impl UserDBLocal {
             },
             users,
             groups,
-            source_hashes: Hashes::new(&passwd_content, &shadow_content, &group_content),
+            source_hashes: hashes::Hashes::new(&passwd_content, &shadow_content, &group_content),
         };
         res
     }
@@ -71,7 +72,7 @@ impl UserDBLocal {
             source_files: files,
             users,
             groups: string_to(&my_group_lines),
-            source_hashes: Hashes::new(&my_passwd_lines, &my_shadow_lines, &my_group_lines),
+            source_hashes: hashes::Hashes::new(&my_passwd_lines, &my_shadow_lines, &my_group_lines),
         })
     }
 }
@@ -97,33 +98,60 @@ impl UserDBWrite for UserDBLocal {
             }
         } else {
             let opened = self.source_files.lock_all_get();
-            let (mut locked_p, locked_s, locked_g) = opened.expect("failed to lock files!");
+            let (mut locked_p, mut locked_s, locked_g) = opened.expect("failed to lock files!");
 
             // read the files to strings
             let p = file_to_string(&locked_p.file)?;
-            let _s = file_to_string(&locked_s.file)?;
+            let s = file_to_string(&locked_s.file)?;
             let _g = file_to_string(&locked_g.file)?;
             {
-                if self.source_hashes.passwd.has_changed(&p) {
+                let src = &self.source_hashes;
+                if src.passwd.has_changed(&p) | src.shadow.has_changed(&s) {
                     error!("The source files have changed. Deleting the user could corrupt the userdatabase. Aborting!");
                 } else {
                     // create the new content of passwd
-                    let modified = user.remove_in(&p);
+                    let modified_p = user.remove_in(&p);
+
                     // write the new content to the file.
-                    let ncont = locked_p.replace_contents(modified);
+                    let ncont = locked_p.replace_contents(modified_p);
                     match ncont {
                         Ok(_) => {
+                            let shad = user.get_shadow();
+                            match shad {
+                                Some(shadow) => {
+                                    let modified_s = shadow.remove_in(&s);
+                                    let ncont = locked_s.replace_contents(modified_s);
+                                    match ncont {
+                                        Ok(_) => (),
+                                        Err(e) => {
+                                            return Err(format!(
+                                                "Error during write to the database. \
+                                        Please doublecheck as the shadowdatabase could be corrupted: {}",
+                                                e,
+                                            )
+                                            .into());
+                                        }
+                                    }
+                                }
+                                None => (),
+                            }
+                            // Remove the user from the memory database(HashMap)
                             let res = self.users.remove(username);
-                            return Ok(res.unwrap());
+                            return Ok(
+                                res.expect("Failed to remove the user from the internal HashMap")
+                            );
                         }
-                        Err(_) => {
-                            return Err("Error during write to the database. \
-                        Please doublecheck as the userdatabase could be corrupted: {}"
-                                .into());
+                        Err(e) => {
+                            return Err(format!(
+                                "Error during write to the database. \
+                        Please doublecheck as the userdatabase could be corrupted: {}",
+                                e,
+                            )
+                            .into());
                         }
                     }
                 }
-                Err(format!("The user has been changed {}", username).into())
+                Err(format!("The userdatabase has been changed {}", username).into())
             }
         }
     }
@@ -254,42 +282,6 @@ impl UserDBValidation for UserDBLocal {
     }
 }
 
-pub struct SourceHash {
-    hashvalue: String,
-}
-
-impl SourceHash {
-    pub fn new(src: &str) -> Self {
-        Self {
-            hashvalue: src.to_owned(),
-        }
-    }
-    pub fn has_changed(&self, new: &str) -> bool {
-        trace!(
-            "Old and new lengths: {}, {}",
-            self.hashvalue.len(),
-            new.len()
-        );
-        !self.hashvalue.eq(new)
-    }
-}
-
-pub struct Hashes {
-    pub passwd: SourceHash,
-    pub shadow: SourceHash,
-    pub group: SourceHash,
-}
-
-impl Hashes {
-    pub fn new(passwd: &str, shadow: &str, group: &str) -> Self {
-        Self {
-            passwd: SourceHash::new(passwd),
-            shadow: SourceHash::new(shadow),
-            group: SourceHash::new(group),
-        }
-    }
-}
-
 /// Parse a file to a string
 fn file_to_string(file: &File) -> Result<String, crate::UserLibError> {
     let mut reader = BufReader::new(file);