git: Use correct file mode when staging (#41900)

Closes #28667

Release Notes:

- Fixed git not preserving file mode when committing. Now if an input file is executable it will be preserved when committed with Zed.

---------

Signed-off-by: 11happy <soni5happy@gmail.com>
Signed-off-by: 11happy <bhuminjaysoni@gmail.com>
Co-authored-by: Jakub Konka <kubkon@jakubkonka.com>

crates/fs/src/fake_git_repo.rs

@@ -138,6 +138,7 @@ impl GitRepository for FakeGitRepository {
         path: RepoPath,
         content: Option<String>,
         _env: Arc<HashMap<String, String>>,
+        _is_executable: bool,
     ) -> BoxFuture<'_, anyhow::Result<()>> {
         self.with_state_async(true, move |state| {
             if let Some(message) = &state.simulated_index_write_error_message {

crates/fs/src/fs.rs

@@ -32,6 +32,7 @@ use std::mem::MaybeUninit;
 use async_tar::Archive;
 use futures::{AsyncRead, Stream, StreamExt, future::BoxFuture};
 use git::repository::{GitRepository, RealGitRepository};
+use is_executable::IsExecutable;
 use rope::Rope;
 use serde::{Deserialize, Serialize};
 use smol::io::AsyncWriteExt;
@@ -208,6 +209,7 @@ pub struct Metadata {
     pub is_dir: bool,
     pub len: u64,
     pub is_fifo: bool,
+    pub is_executable: bool,
 }
 
 /// Filesystem modification time. The purpose of this newtype is to discourage use of operations
@@ -895,6 +897,12 @@ impl Fs for RealFs {
         #[cfg(unix)]
         let is_fifo = metadata.file_type().is_fifo();
 
+        let path_buf = path.to_path_buf();
+        let is_executable = self
+            .executor
+            .spawn(async move { path_buf.is_executable() })
+            .await;
+
         Ok(Some(Metadata {
             inode,
             mtime: MTime(metadata.modified().unwrap_or(SystemTime::UNIX_EPOCH)),
@@ -902,6 +910,7 @@ impl Fs for RealFs {
             is_symlink,
             is_dir: metadata.file_type().is_dir(),
             is_fifo,
+            is_executable,
         }))
     }
 
@@ -2602,6 +2611,7 @@ impl Fs for FakeFs {
                     is_dir: false,
                     is_symlink,
                     is_fifo: false,
+                    is_executable: false,
                 },
                 FakeFsEntry::Dir {
                     inode, mtime, len, ..
@@ -2612,6 +2622,7 @@ impl Fs for FakeFs {
                     is_dir: true,
                     is_symlink,
                     is_fifo: false,
+                    is_executable: false,
                 },
                 FakeFsEntry::Symlink { .. } => unreachable!(),
             }))