fix starting the server when db/media dirs do not exist yet

This used to be supported, as we explicitly call std::fs::create_dir_all
when initializing these, but it was broken in
b01b70fc20, which attempts to canonicalize
the paths to check for overlap before creating them.

src/config.rs

@@ -15,7 +15,7 @@ use ruma::{
 use serde::Deserialize;
 use strum::{Display, EnumIter, IntoEnumIterator};
 
-use crate::error;
+use crate::{error, utils::partial_canonicalize};
 
 mod env_filter_clone;
 mod proxy;
@@ -548,13 +548,13 @@ where
             }
 
             if !sandboxed {
-                let media_path = x
-                    .path
-                    .canonicalize()
+                let media_path = partial_canonicalize(&x.path)
+                    .await
                     .map_err(|e| Error::Canonicalize(e, x.path.clone()))?;
 
-                let database_path =
-                    config.database.path.canonicalize().map_err(|e| {
+                let database_path = partial_canonicalize(&config.database.path)
+                    .await
+                    .map_err(|e| {
                         Error::Canonicalize(e, config.database.path.clone())
                     })?;
 

src/utils.rs

@@ -388,7 +388,6 @@ pub(crate) fn u8_slice_to_hex(slice: &[u8]) -> String {
 /// It's assumed that non-existent components will be created as
 /// directories. This should match the result of [`fs::canonicalize`]
 /// _after_ calling [`fs::create_dir_all`] on `path`.
-#[allow(dead_code)]
 pub(crate) async fn partial_canonicalize(path: &Path) -> io::Result<PathBuf> {
     let mut ret = std::env::current_dir()?;