Add methods to DtpmConfig for loading configuration from a path and encoding file contents in base64

src/types/dtpm.rs

@@ -1,4 +1,5 @@
 use crate::pb::dtpm as pb_dtpm;
+use base64::{engine::general_purpose::STANDARD as BASE64, Engine};
 use serde::{Deserialize, Serialize};
 
 #[derive(Debug, Clone, Serialize, Deserialize, Default)]
@@ -178,3 +179,23 @@ impl From<RestartPolicy> for pb_dtpm::RestartPolicy {
         }
     }
 }
+
+impl DtpmConfig {
+    pub fn from_path(path: &str) -> Result<Self, Box<dyn std::error::Error>> {
+        let config_str = std::fs::read_to_string(path)?;
+        Ok(serde_yml::from_str(&config_str)?)
+    }
+
+    pub fn load_data(mut self) -> Result<Self, Box<dyn std::error::Error>> {
+        self.filesystems.iter_mut().for_each(|x| {
+            if let FileContent::Path(path) = &x.content {
+                let content =
+                    std::fs::read(path).unwrap_or_else(|_| panic!("Unable to read file {path}"));
+                let encoded = BASE64.encode(content);
+                x.content = FileContent::Data(encoded);
+            }
+        });
+
+        Ok(self)
+    }
+}