feat(adex-cli): introduce unix-mode

mm2src/adex_cli/src/adex_config.rs

@@ -9,6 +9,7 @@ use std::path::{Path, PathBuf};
 
 use crate::adex_proc::SmartFractPrecision;
 use crate::helpers::rewrite_json_file;
+#[cfg(unix)] use crate::helpers::set_file_permissions;
 use crate::logging::{error_anyhow, warn_bail};
 
 const PROJECT_QUALIFIER: &str = "com";
@@ -22,6 +23,8 @@ const VOLUME_PRECISION_MIN: usize = 2;
 const VOLUME_PRECISION_MAX: usize = 5;
 const VOLUME_PRECISION: SmartFractPrecision = (VOLUME_PRECISION_MIN, VOLUME_PRECISION_MAX);
 const PRICE_PRECISION: SmartFractPrecision = (PRICE_PRECISION_MIN, PRICE_PRECISION_MAX);
+#[cfg(unix)]
+const CFG_FILE_PERM_MODE: u32 = 0o660;
 
 pub(super) fn get_config() {
     let Ok(adex_cfg) = AdexConfigImpl::from_config_path() else { return; };
@@ -151,7 +154,12 @@ impl AdexConfigImpl {
         let adex_path_str = cfg_path
             .to_str()
             .ok_or_else(|| error_anyhow!("Failed to get cfg_path as str"))?;
-        rewrite_json_file(self, adex_path_str)
+        rewrite_json_file(self, adex_path_str)?;
+        #[cfg(unix)]
+        {
+            set_file_permissions(adex_path_str, CFG_FILE_PERM_MODE)?;
+        }
+        Ok(())
     }
 
     fn set_rpc_password(&mut self, rpc_password: String) { self.rpc_password.replace(rpc_password); }

mm2src/adex_cli/src/helpers.rs

@@ -4,6 +4,7 @@ use serde::{Deserialize, Serialize};
 use std::fs;
 use std::io::Write;
 use std::ops::Deref;
+#[cfg(unix)] use std::os::unix::fs::PermissionsExt;
 use std::path::Path;
 
 use crate::error_anyhow;
@@ -22,6 +23,15 @@ where
     writer
         .write(&data)
         .map_err(|error| error_anyhow!("Failed to write data into {file}: {error}"))?;
+
+    Ok(())
+}
+
+#[cfg(unix)]
+pub(crate) fn set_file_permissions(file: &str, unix_mode: u32) -> Result<()> {
+    let mut perms = fs::metadata(file)?.permissions();
+    perms.set_mode(unix_mode);
+    fs::set_permissions(file, perms)?;
     Ok(())
 }