Config transfer (#951)

* fixed config dir issue

* jackson's sync write

theseus/src/api/pack/import/mod.rs

@@ -301,7 +301,7 @@ pub async fn copy_dotminecraft(
 #[theseus_macros::debug_pin]
 #[async_recursion::async_recursion]
 #[tracing::instrument]
-async fn get_all_subfiles(src: &Path) -> crate::Result<Vec<PathBuf>> {
+pub async fn get_all_subfiles(src: &Path) -> crate::Result<Vec<PathBuf>> {
     if !src.is_dir() {
         return Ok(vec![src.to_path_buf()]);
     }

theseus/src/api/settings.rs

@@ -1,6 +1,6 @@
 //! Theseus profile management interface
 
-use std::path::PathBuf;
+use std::path::{PathBuf, Path};
 use tokio::fs;
 
 use io::IOError;
@@ -10,7 +10,7 @@ use crate::{
     event::emit::{emit_loading, init_loading},
     prelude::DirectoryInfo,
     state::{self, Profiles},
-    util::io,
+    util::{io, fetch},
 };
 pub use crate::{
     state::{
@@ -77,6 +77,7 @@ pub async fn set(settings: Settings) -> crate::Result<()> {
 /// Sets the new config dir, the location of all Theseus data except for the settings.json and caches
 /// Takes control of the entire state and blocks until completion
 pub async fn set_config_dir(new_config_dir: PathBuf) -> crate::Result<()> {
+    tracing::trace!("Changing config dir to: {}", new_config_dir.display());
     if !new_config_dir.is_dir() {
         return Err(crate::ErrorKind::FSError(format!(
             "New config dir is not a folder: {}",
@@ -85,6 +86,14 @@ pub async fn set_config_dir(new_config_dir: PathBuf) -> crate::Result<()> {
         .as_error());
     }
 
+    if !is_dir_writeable(new_config_dir.clone()).await? {
+        return Err(crate::ErrorKind::FSError(format!(
+            "New config dir is not writeable: {}",
+            new_config_dir.display()
+        ))
+        .as_error());
+    }
+
     let loading_bar = init_loading(
         crate::LoadingBarType::ConfigChange {
             new_path: new_config_dir.clone(),
@@ -100,6 +109,52 @@ pub async fn set_config_dir(new_config_dir: PathBuf) -> crate::Result<()> {
     let old_config_dir =
         state_write.directories.config_dir.read().await.clone();
 
+
+    // Reset file watcher
+    tracing::trace!("Reset file watcher");
+    let file_watcher = state::init_watcher().await?;
+    state_write.file_watcher = RwLock::new(file_watcher);
+
+    // Getting files to be moved
+    let mut config_entries = io::read_dir(&old_config_dir).await?;
+    let across_drives = is_different_drive(&old_config_dir, &new_config_dir);
+    let mut entries = vec![];
+    let mut deletable_entries = vec![];
+    while let Some(entry) = config_entries
+        .next_entry()
+        .await
+        .map_err(|e| IOError::with_path(e, &old_config_dir))?
+    {
+
+        let entry_path = entry.path();
+        if let Some(file_name) = entry_path.file_name() {
+            // We are only moving the profiles and metadata folders
+            if file_name == state::PROFILES_FOLDER_NAME || file_name == state::METADATA_FOLDER_NAME {
+                if across_drives {
+                    entries.extend(crate::pack::import::get_all_subfiles(&entry_path).await?);
+                    deletable_entries.push(entry_path.clone());
+                } else {
+                    entries.push(entry_path.clone());
+                }
+            }
+        }
+    }
+
+    tracing::trace!("Moving files");
+    let semaphore = &state_write.io_semaphore;
+    let num_entries = entries.len() as f64;
+    for entry_path in entries {
+        let relative_path = entry_path.strip_prefix(&old_config_dir)?;
+        let new_path = new_config_dir.join(relative_path);
+        if across_drives {
+            fetch::copy(&entry_path, &new_path, semaphore).await?;
+        } else {
+            io::rename(entry_path.clone(), new_path.clone()).await?;
+        }
+        emit_loading(&loading_bar, 80.0 * (1.0 / num_entries), None)
+            .await?;
+    }
+
     tracing::trace!("Setting configuration setting");
     // Set load config dir setting
     let settings = {
@@ -132,41 +187,19 @@ pub async fn set_config_dir(new_config_dir: PathBuf) -> crate::Result<()> {
     tracing::trace!("Reinitializing directory");
     // Set new state information
     state_write.directories = DirectoryInfo::init(&settings)?;
-    let total_entries = std::fs::read_dir(&old_config_dir)
-        .map_err(|e| IOError::with_path(e, &old_config_dir))?
-        .count() as f64;
 
-    // Move all files over from state_write.directories.config_dir to new_config_dir
-    tracing::trace!("Renaming folder structure");
-    let mut i = 0.0;
-    let mut entries = io::read_dir(&old_config_dir).await?;
-    while let Some(entry) = entries
-        .next_entry()
-        .await
-        .map_err(|e| IOError::with_path(e, &old_config_dir))?
-    {
-        let entry_path = entry.path();
-        if let Some(file_name) = entry_path.file_name() {
-            // Ignore settings.json
-            if file_name == state::SETTINGS_FILE_NAME {
-                continue;
-            }
-            // Ignore caches folder
-            if file_name == state::CACHES_FOLDER_NAME {
-                continue;
-            }
-            // Ignore modrinth_logs folder
-            if file_name == state::LAUNCHER_LOGS_FOLDER_NAME {
-                continue;
-            }
-
-            let new_path = new_config_dir.join(file_name);
-            io::rename(entry_path, new_path).await?;
-
-            i += 1.0;
-            emit_loading(&loading_bar, 90.0 * (i / total_entries), None)
-                .await?;
+    // Delete entries that were from a different drive
+    let deletable_entries_len = deletable_entries.len();
+    if deletable_entries_len > 0 {
+        tracing::trace!("Deleting old files");
     }
+    for entry in deletable_entries {
+        io::remove_dir_all(entry).await?;
+        emit_loading(
+            &loading_bar,
+            10.0 * (1.0 / deletable_entries_len as f64),
+            None,
+        ).await?;
     }
 
     // Reset file watcher
@@ -181,15 +214,21 @@ pub async fn set_config_dir(new_config_dir: PathBuf) -> crate::Result<()> {
 
     emit_loading(&loading_bar, 10.0, None).await?;
 
-    // TODO: need to be able to safely error out of this function, reverting the changes
     tracing::info!(
         "Successfully switched config folder to: {}",
         new_config_dir.display()
     );
-
     Ok(())
 }
 
+// Function to check if two paths are on different drives/roots
+fn is_different_drive(path1: &Path, path2: &Path) -> bool {
+    let root1 = path1.components().next();
+    let root2 = path2.components().next();
+    root1 != root2
+}
+
+
 pub async fn is_dir_writeable(new_config_dir: PathBuf) -> crate::Result<bool> {
     let temp_path = new_config_dir.join(".tmp");
     match fs::write(temp_path.clone(), "test").await {

theseus/src/state/dirs.rs

@@ -9,6 +9,8 @@ use super::{ProfilePathId, Settings};
 pub const SETTINGS_FILE_NAME: &str = "settings.json";
 pub const CACHES_FOLDER_NAME: &str = "caches";
 pub const LAUNCHER_LOGS_FOLDER_NAME: &str = "launcher_logs";
+pub const PROFILES_FOLDER_NAME: &str = "profiles";
+pub const METADATA_FOLDER_NAME: &str = "meta";
 
 #[derive(Debug)]
 pub struct DirectoryInfo {
@@ -75,7 +77,7 @@ impl DirectoryInfo {
     /// Get the Minecraft instance metadata directory
     #[inline]
     pub async fn metadata_dir(&self) -> PathBuf {
-        self.config_dir.read().await.join("meta")
+        self.config_dir.read().await.join(METADATA_FOLDER_NAME)
     }
 
     /// Get the Minecraft java versions metadata directory
@@ -153,7 +155,7 @@ impl DirectoryInfo {
     /// Get the profiles directory for created profiles
     #[inline]
     pub async fn profiles_dir(&self) -> PathBuf {
-        self.config_dir.read().await.join("profiles")
+        self.config_dir.read().await.join(PROFILES_FOLDER_NAME)
     }
 
     /// Gets the logs dir for a given profile

theseus/src/util/io.rs

@@ -1,7 +1,10 @@
 // IO error
 // A wrapper around the tokio IO functions that adds the path to the error message, instead of the uninformative std::io::Error.
 
-use std::path::Path;
+use std::{path::Path, io::Write};
+
+use tempfile::NamedTempFile;
+use tauri::async_runtime::spawn_blocking;
 
 #[derive(Debug, thiserror::Error)]
 pub enum IOError {
@@ -113,15 +116,39 @@ pub async fn write(
     path: impl AsRef<std::path::Path>,
     data: impl AsRef<[u8]>,
 ) -> Result<(), IOError> {
-    let path = path.as_ref();
-    tokio::fs::write(path, data)
-        .await
-        .map_err(|e| IOError::IOPathError {
+    let path = path.as_ref().to_owned();
+    let data = data.as_ref().to_owned();
+    spawn_blocking(move || {
+        let cloned_path = path.clone();
+        sync_write(data, path).map_err(|e| IOError::IOPathError {
             source: e,
-            path: path.to_string_lossy().to_string(),
+            path: cloned_path.to_string_lossy().to_string(),
         })
+    })
+    .await
+    .map_err(|_| {
+        std::io::Error::new(std::io::ErrorKind::Other, "background task failed")
+    })??;
+
+    Ok(())
 }
 
+fn sync_write(
+    data: impl AsRef<[u8]>,
+    path: impl AsRef<Path>,
+) -> Result<(), std::io::Error> {
+    let mut tempfile = NamedTempFile::new_in(path.as_ref().parent().ok_or_else(|| {
+        std::io::Error::new(
+            std::io::ErrorKind::Other,
+            "could not get parent directory for temporary file",
+        )
+    })?)?;
+    tempfile.write_all(data.as_ref())?;
+    let tmp_path = tempfile.into_temp_path();
+    let path = path.as_ref();
+    tmp_path.persist(path)?;
+    std::io::Result::Ok(())
+}
 // rename
 pub async fn rename(
     from: impl AsRef<std::path::Path>,

theseus_gui/src/pages/Settings.vue

@@ -139,7 +139,7 @@ async function findLauncherDir() {
 }
 
 async function refreshDir() {
-  await change_config_dir(settingsDir.value)
+  await change_config_dir(settingsDir.value).catch(handleError)
   settings.value = await accessSettings().catch(handleError)
   settingsDir.value = settings.value.loaded_config_dir
 }