1 files changed, 15 insertions, 0 deletions
diff --git a/src/args.rs b/src/args.rs
index e9243f5..72ade7b 100644
--- a/src/args.rs
+++ b/src/args.rs
@@ -36,6 +36,7 @@ pub struct CliArgs {
         long = "temp-directory",
         value_hint = ValueHint::FilePath,
         requires = "allowed_upload_dir",
+        value_parser(validate_is_dir_and_exists),
         env = "MINISERVER_TEMP_UPLOAD_DIRECTORY")
     ]
     pub temp_upload_directory: Option<PathBuf>,
@@ -356,6 +357,20 @@ fn parse_interface(src: &str) -> Result<IpAddr, std::net::AddrParseError> {
     src.parse::<IpAddr>()
 }
 
+/// Validate that a path passed in is a directory and it exists.
+fn validate_is_dir_and_exists(s: &str) -> Result<PathBuf, String> {
+    let path = PathBuf::from(s);
+    if path.exists() && path.is_dir() {
+        Ok(path)
+    } else {
+        Err(format!(
+            "Upload temporary directory must exist and be a directory. \
+            Validate that path {:?} meets those requirements.",
+            path
+        ))
+    }
+}
+
 #[derive(Clone, Debug, thiserror::Error)]
 pub enum AuthParseError {
     /// Might occur if the HTTP credential string does not respect the expected format