Migrate linux configuration to a better named path.

crates/librqbit_core/src/directories.rs

@@ -1,6 +1,61 @@
 use anyhow::Context;
+use tracing::{info, warn};
+
+pub fn get_configuration_directory_linux(
+    application: &str,
+) -> anyhow::Result<directories::ProjectDirs> {
+    // https://github.com/ikatson/rqbit/issues/252
+    // On Linux, "com.rqbit" isn't used resulting in weird folder names like "session".
+    // The code below migrates from old configuration to new.
+    let legacy_dir =
+        directories::ProjectDirs::from("com", "rqbit", application).with_context(|| {
+            format!("cannot determine project directory for com.rqbit.{application}")
+        })?;
+    let new_dir =
+        directories::ProjectDirs::from("com", "rqbit", &format!("com.rqbit.{application}"))
+            .with_context(|| {
+                format!("cannot determine project directory for com.rqbit.{application}")
+            })?;
+    for (old, new) in [
+        (legacy_dir.cache_dir(), new_dir.cache_dir()),
+        (legacy_dir.config_dir(), new_dir.config_dir()),
+        (legacy_dir.data_dir(), new_dir.data_dir()),
+    ] {
+        match (old.exists(), new.exists()) {
+            (true, true) => {
+                warn!(
+                    ?old,
+                    ?new,
+                    "can't migrate configuraiton as both directories exist, not sure what to do"
+                )
+            }
+            (true, false) => {
+                info!(
+                    ?old,
+                    ?new,
+                    "migrating configuration directories as rqbit was upgraded"
+                );
+                if let Err(e) = std::fs::rename(old, new) {
+                    warn!(?old, ?new, "error migrating: {e:#}");
+                }
+            }
+            // In these cases, nothing to migrate, so do nothing.
+            (false, true) => {}
+            (false, false) => {}
+        }
+    }
+    Ok(new_dir)
+}
 
 pub fn get_configuration_directory(application: &str) -> anyhow::Result<directories::ProjectDirs> {
-    directories::ProjectDirs::from("com", "rqbit", application)
+    #[cfg(not(any(target_os = "macos", target_os = "windows")))]
-        .with_context(|| format!("cannot determine project directory for com.rqbit.{application}"))
+    {
+        get_configuration_directory_linux(application)
+    }
+    #[cfg(any(target_os = "macos", target_os = "windows"))]
+    {
+        directories::ProjectDirs::from("com", "rqbit", application).with_context(|| {
+            format!("cannot determine project directory for com.rqbit.{application}")
+        })
+    }
 }