Fix nightly clippy warnings (#872)

src/config.rs

@@ -568,13 +568,11 @@ impl ConfigFile {
             to read the include directory before returning the main config path
             */
             for include in dir_include {
-                let include_contents = fs::read_to_string(&include).map_err(|e| {
+                let include_contents = fs::read_to_string(&include).inspect_err(|_| {
                     error!("Unable to read {}", include.display());
-                    e
                 })?;
-                let include_contents_parsed = toml::from_str(include_contents.as_str()).map_err(|e| {
+                let include_contents_parsed = toml::from_str(include_contents.as_str()).inspect_err(|_| {
                     error!("Failed to deserialize {}", include.display());
-                    e
                 })?;
 
                 result.merge(include_contents_parsed);
@@ -589,9 +587,8 @@ impl ConfigFile {
             return Ok(result);
         }
 
-        let mut contents_non_split = fs::read_to_string(&config_path).map_err(|e| {
+        let mut contents_non_split = fs::read_to_string(&config_path).inspect_err(|_| {
             error!("Unable to read {}", config_path.display());
-            e
         })?;
 
         Self::ensure_misc_is_present(&mut contents_non_split, &config_path);
@@ -602,9 +599,8 @@ impl ConfigFile {
         let contents_split = regex_match_include.split_inclusive_left(contents_non_split.as_str());
 
         for contents in contents_split {
-            let config_file_include_only: ConfigFileIncludeOnly = toml::from_str(contents).map_err(|e| {
+            let config_file_include_only: ConfigFileIncludeOnly = toml::from_str(contents).inspect_err(|_| {
                 error!("Failed to deserialize an include section of {}", config_path.display());
-                e
             })?;
 
             if let Some(includes) = &config_file_include_only.include {

src/steps/os/linux.rs

@@ -369,7 +369,7 @@ fn upgrade_openmandriva(ctx: &ExecutionContext) -> Result<()> {
     let sudo = require_option(ctx.sudo().as_ref(), REQUIRE_SUDO.to_string())?;
     let mut command = ctx.run_type().execute(sudo);
 
-    command.arg(&which("dnf").unwrap()).arg("upgrade");
+    command.arg(which("dnf").unwrap()).arg("upgrade");
 
     if let Some(args) = ctx.config().dnf_arguments() {
         command.args(args.split_whitespace());
@@ -388,7 +388,7 @@ fn upgrade_pclinuxos(ctx: &ExecutionContext) -> Result<()> {
     let sudo = require_option(ctx.sudo().as_ref(), REQUIRE_SUDO.to_string())?;
     let mut command_update = ctx.run_type().execute(sudo);
 
-    command_update.arg(&which("apt-get").unwrap()).arg("update");
+    command_update.arg(which("apt-get").unwrap()).arg("update");
 
     if let Some(args) = ctx.config().dnf_arguments() {
         command_update.args(args.split_whitespace());
@@ -401,7 +401,7 @@ fn upgrade_pclinuxos(ctx: &ExecutionContext) -> Result<()> {
     command_update.status_checked()?;
 
     let mut cmd = ctx.run_type().execute(sudo);
-    cmd.arg(&which("apt-get").unwrap());
+    cmd.arg(which("apt-get").unwrap());
     cmd.arg("dist-upgrade");
     if ctx.config().yes(Step::System) {
         cmd.arg("-y");

src/steps/zsh.rs

@@ -229,7 +229,7 @@ pub fn run_oh_my_zsh(ctx: &ExecutionContext) -> Result<()> {
     custom_repos.remove(&oh_my_zsh);
     ctx.run_type()
         .execute("zsh")
-        .arg(&oh_my_zsh.join("tools/upgrade.sh"))
+        .arg(oh_my_zsh.join("tools/upgrade.sh"))
         // oh-my-zsh returns 80 when it is already updated and no changes pulled
         // in this update.
         // See this comment: https://github.com/r-darwish/topgrade/issues/569#issuecomment-736756731