clean up the easy clippy errors

I'm still not running clippy on CI and probably should.
There are a few left that were a little more involved to address.

server/base/strutil.rs

@@ -61,6 +61,7 @@ fn decode_size_internal(input: &str) -> IResult<&str, i64> {
 }
 
 /// Decodes a human-readable size as output by encode_size.
+#[allow(clippy::result_unit_err)]
 pub fn decode_size(encoded: &str) -> Result<i64, ()> {
     let (remaining, decoded) = decode_size_internal(encoded).map_err(|_e| ())?;
     if !remaining.is_empty() {
@@ -85,6 +86,7 @@ pub fn hex(raw: &[u8]) -> String {
 }
 
 /// Returns [0, 16) or error.
+#[allow(clippy::result_unit_err)]
 fn dehex_byte(hex_byte: u8) -> Result<u8, ()> {
     match hex_byte {
         b'0'..=b'9' => Ok(hex_byte - b'0'),
@@ -95,6 +97,7 @@ fn dehex_byte(hex_byte: u8) -> Result<u8, ()> {
 
 /// Returns a 20-byte raw form of the given hex string.
 /// (This is the size of a SHA1 hash, the only current use of this function.)
+#[allow(clippy::result_unit_err)]
 pub fn dehex(hexed: &[u8]) -> Result<[u8; 20], ()> {
     if hexed.len() != 40 {
         return Err(());

server/db/auth.rs

@@ -92,7 +92,7 @@ impl UserChange {
 
     pub fn set_password(&mut self, pwd: String) {
         let salt = SaltString::generate(&mut scrypt::password_hash::rand_core::OsRng);
-        let params = PARAMS.lock().clone();
+        let params = *PARAMS.lock();
         let hash = scrypt::Scrypt
             .hash_password_customized(pwd.as_bytes(), None, None, params, &salt)
             .unwrap();
@@ -142,7 +142,7 @@ impl rusqlite::types::FromSql for FromSqlIpAddr {
         use rusqlite::types::ValueRef;
         match value {
             ValueRef::Null => Ok(FromSqlIpAddr(None)),
-            ValueRef::Blob(ref b) => match b.len() {
+            ValueRef::Blob(b) => match b.len() {
                 4 => {
                     let mut buf = [0u8; 4];
                     buf.copy_from_slice(b);

server/db/check.rs

@@ -73,7 +73,7 @@ pub fn run(conn: &mut rusqlite::Connection, opts: &Options) -> Result<i32, Error
         warn!("The following analysis may be incorrect or encounter errors due to schema differences.");
     }
 
-    let (db_uuid, _config) = raw::read_meta(&conn)?;
+    let (db_uuid, _config) = raw::read_meta(conn)?;
 
     // Scan directories.
     let mut dirs_by_id: FnvHashMap<i32, Dir> = FnvHashMap::default();
@@ -141,7 +141,7 @@ pub fn run(conn: &mut rusqlite::Connection, opts: &Options) -> Result<i32, Error
             let cum_recordings = row.get(2)?;
             let mut stream = match dirs_by_id.get_mut(&dir_id) {
                 None => Stream::default(),
-                Some(d) => d.remove(&stream_id).unwrap_or_else(Stream::default),
+                Some(d) => d.remove(&stream_id).unwrap_or_default(),
             };
             stream.cum_recordings = Some(cum_recordings);
             printed_error |= compare_stream(conn, dir_id, stream_id, opts, stream, &mut ctx)?;

server/db/compare.rs

@@ -67,12 +67,12 @@ fn diff_slices<T: std::fmt::Display + PartialEq>(
         match item {
             diff::Result::Left(i) => {
                 changed = true;
-                write!(&mut diff, "-{}\n", i)
+                writeln!(&mut diff, "-{}", i)
             }
-            diff::Result::Both(i, _) => write!(&mut diff, " {}\n", i),
+            diff::Result::Both(i, _) => writeln!(&mut diff, " {}", i),
             diff::Result::Right(i) => {
                 changed = true;
-                write!(&mut diff, "+{}\n", i)
+                writeln!(&mut diff, "+{}", i)
             }
         }
         .unwrap();
@@ -177,8 +177,8 @@ pub fn get_diffs(
 
     // Compare columns and indices for each table.
     for t in &tables1 {
-        let columns1 = get_table_columns(c1, &t)?;
-        let columns2 = get_table_columns(c2, &t)?;
+        let columns1 = get_table_columns(c1, t)?;
+        let columns2 = get_table_columns(c2, t)?;
         if let Some(diff) = diff_slices(n1, &columns1[..], n2, &columns2[..]) {
             write!(
                 &mut diffs,
@@ -187,8 +187,8 @@ pub fn get_diffs(
             )?;
         }
 
-        let mut indices1 = get_indices(c1, &t)?;
-        let mut indices2 = get_indices(c2, &t)?;
+        let mut indices1 = get_indices(c1, t)?;
+        let mut indices2 = get_indices(c2, t)?;
         indices1.sort_by(|a, b| a.name.cmp(&b.name));
         indices2.sort_by(|a, b| a.name.cmp(&b.name));
         if let Some(diff) = diff_slices(n1, &indices1[..], n2, &indices2[..]) {

server/db/db.rs

@@ -2113,7 +2113,7 @@ impl LockedDatabase {
 ///
 /// These are `pub` so that the `moonfire-nvr sql` command can pass to the SQLite3 binary with
 /// `-cmd`.
-pub static INTEGRITY_PRAGMAS: [&'static str; 3] = [
+pub static INTEGRITY_PRAGMAS: [&str; 3] = [
     // Enforce foreign keys. This is on by default with --features=bundled (as rusqlite
     // compiles the SQLite3 amalgamation with -DSQLITE_DEFAULT_FOREIGN_KEYS=1). Ensure it's
     // always on. Note that our foreign keys are immediate rather than deferred, so we have to

server/db/dir/mod.rs

@@ -156,7 +156,7 @@ pub(crate) fn read_meta(dir: &Fd) -> Result<schema::DirMeta, Error> {
         );
     }
     let data = &data[pos..pos + len as usize];
-    let mut s = protobuf::CodedInputStream::from_bytes(&data);
+    let mut s = protobuf::CodedInputStream::from_bytes(data);
     meta.merge_from(&mut s)
         .map_err(|e| e.context("Unable to parse metadata proto"))?;
     Ok(meta)

server/db/json.rs

@@ -239,7 +239,7 @@ pub struct StreamConfig {
 }
 sql!(StreamConfig);
 
-pub const STREAM_MODE_RECORD: &'static str = "record";
+pub const STREAM_MODE_RECORD: &str = "record";
 
 impl StreamConfig {
     pub fn is_empty(&self) -> bool {

server/db/recording.rs

@@ -374,6 +374,7 @@ impl Segment {
             // Note: this inner loop avoids ? for performance. Don't change these lines without
             // reading https://github.com/rust-lang/rust/issues/37939 and running
             // mp4::bench::build_index.
+            #[allow(clippy::question_mark)]
             if let Err(e) = f(&it) {
                 return Err(e);
             }

server/db/signal.rs

@@ -344,7 +344,7 @@ impl State {
             }
             match self.signals_by_id.get(&signal) {
                 None => bail_t!(InvalidArgument, "unknown signal {}", signal),
-                Some(ref s) => {
+                Some(s) => {
                     let states = self
                         .types_by_uuid
                         .get(&s.type_)

server/db/upgrade/mod.rs

@@ -76,7 +76,7 @@ fn upgrade(args: &Args, target_ver: i32, conn: &mut rusqlite::Connection) -> Res
         for ver in old_ver..target_ver {
             info!("...from version {} to version {}", ver, ver + 1);
             let tx = conn.transaction()?;
-            upgraders[ver as usize](&args, &tx)?;
+            upgraders[ver as usize](args, &tx)?;
             tx.execute(
                 r#"
                 insert into version (id, unix_time, notes)
@@ -94,7 +94,7 @@ fn upgrade(args: &Args, target_ver: i32, conn: &mut rusqlite::Connection) -> Res
 pub fn run(args: &Args, conn: &mut rusqlite::Connection) -> Result<(), Error> {
     db::check_sqlite_version()?;
     db::set_integrity_pragmas(conn)?;
-    set_journal_mode(&conn, args.preset_journal)?;
+    set_journal_mode(conn, args.preset_journal)?;
     upgrade(args, db::EXPECTED_VERSION, conn)?;
 
     // As in "moonfire-nvr init": try for page_size=16384 and wal for the reasons explained there.
@@ -114,7 +114,7 @@ pub fn run(args: &Args, conn: &mut rusqlite::Connection) -> Result<(), Error> {
         )?;
     }
 
-    set_journal_mode(&conn, "wal")?;
+    set_journal_mode(conn, "wal")?;
     info!("...done.");
 
     Ok(())

server/db/upgrade/v0_to_v1.rs

@@ -221,7 +221,7 @@ fn update_camera(
       update camera set next_recording_id = :next_recording_id where id = :id
     "#,
     )?;
-    for (ref id, ref state) in &camera_state {
+    for (ref id, state) in &camera_state {
         stmt.execute(named_params! {
             ":id": &id,
             ":next_recording_id": &state.next_recording_id,

server/db/upgrade/v1_to_v2.rs

@@ -97,7 +97,7 @@ pub fn run(args: &super::Args, tx: &rusqlite::Transaction) -> Result<(), Error>
         meta.dir_uuid.extend_from_slice(dir_uuid_bytes);
         let open = meta.last_complete_open.mut_or_insert_default();
         open.id = open_id;
-        open.uuid.extend_from_slice(&open_uuid_bytes);
+        open.uuid.extend_from_slice(open_uuid_bytes);
     }
     dir::write_meta(d.as_raw_fd(), &meta)?;
 

server/db/upgrade/v2_to_v3.rs

@@ -55,7 +55,7 @@ fn open_sample_file_dir(tx: &rusqlite::Transaction) -> Result<Arc<dir::SampleFil
 }
 
 pub fn run(_args: &super::Args, tx: &rusqlite::Transaction) -> Result<(), Error> {
-    let d = open_sample_file_dir(&tx)?;
+    let d = open_sample_file_dir(tx)?;
     let mut stmt = tx.prepare(
         r#"
         select

server/db/upgrade/v4_to_v5.rs

@@ -37,7 +37,7 @@ fn maybe_upgrade_meta(dir: &dir::Fd, db_meta: &schema::DirMeta) -> Result<bool,
     dir_meta
         .merge_from(&mut s)
         .map_err(|e| e.context("Unable to parse metadata proto: {}"))?;
-    if let Err(e) = dir::SampleFileDir::check_consistent(&db_meta, &dir_meta) {
+    if let Err(e) = dir::SampleFileDir::check_consistent(db_meta, &dir_meta) {
         bail!(
             "Inconsistent db_meta={:?} dir_meta={:?}: {}",
             &db_meta,

server/db/writer.rs

@@ -432,7 +432,7 @@ impl<C: Clocks + Clone, D: DirWriter> Syncer<C, D> {
                 let timeout = (t - now)
                     .to_std()
                     .unwrap_or_else(|_| StdDuration::new(0, 0));
-                match self.db.clocks().recv_timeout(&cmds, timeout) {
+                match self.db.clocks().recv_timeout(cmds, timeout) {
                     Err(mpsc::RecvTimeoutError::Disconnected) => return false, // cmd senders gone.
                     Err(mpsc::RecvTimeoutError::Timeout) => {
                         self.flush();

server/src/cmds/config/cameras.rs

@@ -118,12 +118,8 @@ fn parse_url(raw: &str, allowed_schemes: &'static [&'static str]) -> Result<Opti
     if raw.is_empty() {
         return Ok(None);
     }
-    let url = url::Url::parse(&raw).with_context(|_| format!("can't parse {:?} as URL", &raw))?;
-    if allowed_schemes
-        .iter()
-        .find(|scheme| **scheme == url.scheme())
-        .is_none()
-    {
+    let url = url::Url::parse(raw).with_context(|_| format!("can't parse {:?} as URL", &raw))?;
+    if allowed_schemes.iter().any(|scheme| *scheme == url.scheme()) {
         bail!("Unexpected scheme in URL {}", &url);
     }
     if !url.username().is_empty() || url.password().is_some() {
@@ -391,7 +387,7 @@ fn lower_retention(
     let dirs_to_open: Vec<_> = zero_limits.keys().copied().collect();
     db.lock().open_sample_file_dirs(&dirs_to_open[..])?;
     for (&dir_id, l) in &zero_limits {
-        writer::lower_retention(db.clone(), dir_id, &l)?;
+        writer::lower_retention(db.clone(), dir_id, l)?;
     }
     Ok(())
 }
@@ -557,7 +553,7 @@ fn edit_camera_dialog(db: &Arc<db::Database>, siv: &mut Cursive, item: &Option<i
                     .find_name::<views::Button>(&format!("{}_test", t.as_str()))
                     .unwrap();
                 edit_url(
-                    &s.config.url.as_ref().map(Url::as_str).unwrap_or(""),
+                    s.config.url.as_ref().map(Url::as_str).unwrap_or(""),
                     test_button,
                 );
                 dialog.call_on_name(
@@ -596,7 +592,7 @@ fn edit_camera_dialog(db: &Arc<db::Database>, siv: &mut Cursive, item: &Option<i
             ("short_name", &*camera.short_name),
             (
                 "onvif_base_url",
-                &camera
+                camera
                     .config
                     .onvif_base_url
                     .as_ref()

server/src/cmds/run/mod.rs

@@ -205,8 +205,8 @@ fn prepare_unix_socket(p: &Path) {
 
 fn make_listener(addr: &config::AddressConfig) -> Result<Listener, Error> {
     let sa: SocketAddr = match addr {
-        config::AddressConfig::Ipv4(a) => a.clone().into(),
-        config::AddressConfig::Ipv6(a) => a.clone().into(),
+        config::AddressConfig::Ipv4(a) => (*a).into(),
+        config::AddressConfig::Ipv6(a) => (*a).into(),
         config::AddressConfig::Unix(p) => {
             prepare_unix_socket(p);
             return Ok(Listener::Unix(
@@ -390,7 +390,7 @@ async fn inner(
     let web_handles = web_handles?;
 
     info!("Ready to serve HTTP requests");
-    let _ = shutdown_rx.as_future().await;
+    shutdown_rx.as_future().await;
 
     info!("Shutting down streamers and syncers.");
     tokio::task::spawn_blocking({

server/src/cmds/sql.rs

@@ -52,12 +52,7 @@ pub fn run(args: Args) -> Result<i32, Error> {
         db.push("?mode=ro");
     }
     Err(Command::new("sqlite3")
-        .args(
-            db::db::INTEGRITY_PRAGMAS
-                .iter()
-                .map(|p| ["-cmd", p])
-                .flatten(),
-        )
+        .args(db::db::INTEGRITY_PRAGMAS.iter().flat_map(|p| ["-cmd", p]))
         .arg(&db)
         .args(&args.arg)
         .exec()

server/src/json.rs

@@ -446,7 +446,7 @@ impl<'a> ListRecordings<'a> {
         for id in v {
             map.serialize_entry(
                 id,
-                &VideoSampleEntry::from(&db.video_sample_entries_by_id().get(id).unwrap()),
+                &VideoSampleEntry::from(db.video_sample_entries_by_id().get(id).unwrap()),
             )?;
         }
         map.end()

server/src/mp4.rs

@@ -801,7 +801,7 @@ impl slices::Slice for Slice {
             SliceType::Stsz => self.wrap_index(f, range.clone(), len, &Segment::stsz),
             SliceType::Stss => self.wrap_index(f, range.clone(), len, &Segment::stss),
             SliceType::Co64 => f.0.get_co64(range.clone(), len),
-            SliceType::VideoSampleData => return f.0.get_video_sample_data(p, range.clone()),
+            SliceType::VideoSampleData => return f.0.get_video_sample_data(p, range),
             SliceType::SubtitleSampleData => f.0.get_subtitle_sample_data(p, range.clone(), len),
             SliceType::Truns => self.wrap_truns(f, range.clone(), len as usize),
         };

server/src/web/mod.rs

@@ -98,7 +98,7 @@ struct Caller {
 type ResponseResult = Result<Response<Body>, HttpError>;
 
 fn serve_json<T: serde::ser::Serialize>(req: &Request<hyper::Body>, out: &T) -> ResponseResult {
-    let (mut resp, writer) = http_serve::streaming_body(&req).build();
+    let (mut resp, writer) = http_serve::streaming_body(req).build();
     resp.headers_mut().insert(
         header::CONTENT_TYPE,
         HeaderValue::from_static("application/json"),

server/src/web/path.rs

@@ -50,10 +50,10 @@ impl Path {
                 Some(p) => p,
                 None => return Path::NotFound,
             };
-            if let Ok(id) = i32::from_str(&path) {
+            if let Ok(id) = i32::from_str(path) {
                 return Path::InitSegment(id, debug);
             }
-            return Path::NotFound;
+            Path::NotFound
         } else if let Some(path) = path.strip_prefix("cameras/") {
             let (uuid, path) = match path.split_once('/') {
                 Some(pair) => pair,

server/src/web/session.rs

@@ -53,7 +53,7 @@ impl Service {
                 0
             };
         let (sid, _) = l
-            .login_by_password(authreq, &r.username, r.password, Some(domain), flags)
+            .login_by_password(authreq, r.username, r.password, Some(domain), flags)
             .map_err(|e| plain_response(StatusCode::UNAUTHORIZED, e.to_string()))?;
         let cookie = encode_sid(sid, flags);
         Ok(Response::builder()