Drop some legacy codes (tiann#1981)

Author: yujincheng08

userspace/ksud/src/defs.rs

@@ -29,8 +29,6 @@ pub const MODULE_UPDATE_TMP_DIR: &str = concatcp!(ADB_DIR, "modules_update/");
 pub const SYSTEM_RW_DIR: &str = concatcp!(MODULE_DIR, ".rw/");
 
 pub const TEMP_DIR: &str = "/debug_ramdisk";
-pub const TEMP_DIR_LEGACY: &str = "/sbin";
-
 pub const MODULE_WEB_DIR: &str = "webroot";
 pub const DISABLE_FILE_NAME: &str = "disable";
 pub const UPDATE_FILE_NAME: &str = "update";

userspace/ksud/src/init_event.rs

@@ -191,7 +191,7 @@ pub fn on_post_data_fs() -> Result<()> {
     }
 
     // mount temp dir
-    if let Err(e) = mount::mount_tmpfs(utils::get_tmp_path()) {
+    if let Err(e) = mount::mount_tmpfs(defs::TEMP_DIR) {
         warn!("do temp dir mount failed: {}", e);
     }
 

userspace/ksud/src/mount.rs

@@ -63,21 +63,18 @@ pub fn mount_ext4(source: impl AsRef<Path>, target: impl AsRef<Path>) -> Result<
         .attach(source)
         .with_context(|| "Failed to attach loop")?;
     let lo = new_loopback.path().ok_or(anyhow!("no loop"))?;
-    if let Result::Ok(fs) = fsopen("ext4", FsOpenFlags::FSOPEN_CLOEXEC) {
-        let fs = fs.as_fd();
-        fsconfig_set_string(fs, "source", lo)?;
-        fsconfig_create(fs)?;
-        let mount = fsmount(fs, FsMountFlags::FSMOUNT_CLOEXEC, MountAttrFlags::empty())?;
-        move_mount(
-            mount.as_fd(),
-            "",
-            CWD,
-            target.as_ref(),
-            MoveMountFlags::MOVE_MOUNT_F_EMPTY_PATH,
-        )?;
-    } else {
-        mount(lo, target.as_ref(), "ext4", MountFlags::empty(), "")?;
-    }
+    let fs = fsopen("ext4", FsOpenFlags::FSOPEN_CLOEXEC)?;
+    let fs = fs.as_fd();
+    fsconfig_set_string(fs, "source", lo)?;
+    fsconfig_create(fs)?;
+    let mount = fsmount(fs, FsMountFlags::FSMOUNT_CLOEXEC, MountAttrFlags::empty())?;
+    move_mount(
+        mount.as_fd(),
+        "",
+        CWD,
+        target.as_ref(),
+        MoveMountFlags::MOVE_MOUNT_F_EMPTY_PATH,
+    )?;
     Ok(())
 }
 
@@ -157,27 +154,18 @@ pub fn mount_overlayfs(
 #[cfg(any(target_os = "linux", target_os = "android"))]
 pub fn mount_tmpfs(dest: impl AsRef<Path>) -> Result<()> {
     info!("mount tmpfs on {}", dest.as_ref().display());
-    if let Result::Ok(fs) = fsopen("tmpfs", FsOpenFlags::FSOPEN_CLOEXEC) {
-        let fs = fs.as_fd();
-        fsconfig_set_string(fs, "source", KSU_OVERLAY_SOURCE)?;
-        fsconfig_create(fs)?;
-        let mount = fsmount(fs, FsMountFlags::FSMOUNT_CLOEXEC, MountAttrFlags::empty())?;
-        move_mount(
-            mount.as_fd(),
-            "",
-            CWD,
-            dest.as_ref(),
-            MoveMountFlags::MOVE_MOUNT_F_EMPTY_PATH,
-        )?;
-    } else {
-        mount(
-            KSU_OVERLAY_SOURCE,
-            dest.as_ref(),
-            "tmpfs",
-            MountFlags::empty(),
-            "",
-        )?;
-    }
+    let fs = fsopen("tmpfs", FsOpenFlags::FSOPEN_CLOEXEC)?;
+    let fs = fs.as_fd();
+    fsconfig_set_string(fs, "source", KSU_OVERLAY_SOURCE)?;
+    fsconfig_create(fs)?;
+    let mount = fsmount(fs, FsMountFlags::FSMOUNT_CLOEXEC, MountAttrFlags::empty())?;
+    move_mount(
+        mount.as_fd(),
+        "",
+        CWD,
+        dest.as_ref(),
+        MoveMountFlags::MOVE_MOUNT_F_EMPTY_PATH,
+    )?;
     Ok(())
 }
 
@@ -188,29 +176,20 @@ pub fn bind_mount(from: impl AsRef<Path>, to: impl AsRef<Path>) -> Result<()> {
         from.as_ref().display(),
         to.as_ref().display()
     );
-    if let Result::Ok(tree) = open_tree(
+    let tree = open_tree(
         CWD,
         from.as_ref(),
         OpenTreeFlags::OPEN_TREE_CLOEXEC
             | OpenTreeFlags::OPEN_TREE_CLONE
             | OpenTreeFlags::AT_RECURSIVE,
-    ) {
-        move_mount(
-            tree.as_fd(),
-            "",
-            CWD,
-            to.as_ref(),
-            MoveMountFlags::MOVE_MOUNT_F_EMPTY_PATH,
-        )?;
-    } else {
-        mount(
-            from.as_ref(),
-            to.as_ref(),
-            "",
-            MountFlags::BIND | MountFlags::REC,
-            "",
-        )?;
-    }
+    )?;
+    move_mount(
+        tree.as_fd(),
+        "",
+        CWD,
+        to.as_ref(),
+        MoveMountFlags::MOVE_MOUNT_F_EMPTY_PATH,
+    )?;
     Ok(())
 }
 

userspace/ksud/src/utils.rs

@@ -1,17 +1,15 @@
 use anyhow::{bail, Context, Error, Ok, Result};
 use std::{
-    fs::{self, create_dir_all, remove_file, write, File, OpenOptions},
+    fs::{create_dir_all, remove_file, write, File, OpenOptions},
     io::{
         ErrorKind::{AlreadyExists, NotFound},
         Write,
     },
     path::Path,
     process::Command,
-    sync::OnceLock,
 };
 
 use crate::{assets, boot_patch, defs, ksucalls, module, restorecon};
-use std::fs::metadata;
 #[allow(unused_imports)]
 use std::fs::{set_permissions, Permissions};
 #[cfg(unix)]
@@ -189,68 +187,6 @@ pub fn has_magisk() -> bool {
     which::which("magisk").is_ok()
 }
 
-fn is_ok_empty(dir: &str) -> bool {
-    use std::result::Result::Ok;
-
-    match fs::read_dir(dir) {
-        Ok(mut entries) => entries.next().is_none(),
-        Err(_) => false,
-    }
-}
-
-fn find_temp_path() -> String {
-    use std::result::Result::Ok;
-
-    if is_ok_empty(defs::TEMP_DIR) {
-        return defs::TEMP_DIR.to_string();
-    }
-
-    // Try to create a random directory in /dev/
-    let r = tempfile::tempdir_in("/dev/");
-    match r {
-        Ok(tmp_dir) => {
-            if let Some(path) = tmp_dir.into_path().to_str() {
-                return path.to_string();
-            }
-        }
-        Err(_e) => {}
-    }
-
-    let dirs = [
-        defs::TEMP_DIR,
-        "/patch_hw",
-        "/oem",
-        "/root",
-        defs::TEMP_DIR_LEGACY,
-    ];
-
-    // find empty directory
-    for dir in dirs {
-        if is_ok_empty(dir) {
-            return dir.to_string();
-        }
-    }
-
-    // Fallback to non-empty directory
-    for dir in dirs {
-        if metadata(dir).is_ok() {
-            return dir.to_string();
-        }
-    }
-
-    "".to_string()
-}
-
-pub fn get_tmp_path() -> &'static str {
-    static CHOSEN_TMP_PATH: OnceLock<String> = OnceLock::new();
-
-    CHOSEN_TMP_PATH.get_or_init(|| {
-        let r = find_temp_path();
-        log::info!("Chosen temp_path: {}", r);
-        r
-    })
-}
-
 #[cfg(target_os = "android")]
 fn link_ksud_to_bin() -> Result<()> {
     let ksu_bin = PathBuf::from(defs::DAEMON_PATH);