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fix(io): handle file shrink in update_for_append to prevent SIGBUS

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File truncation/rotation during mmap lifetime caused SIGBUS crash
because update_for_append() ignored new_size < old_size, leaving
a stale mapping that would fault on access.

Introduce AppendStatus enum (Unchanged/Appended/Reloaded) so the
caller can distinguish shrink events from normal appends. On shrink,
reload() rebuilds the mmap and line index. The TUI layer clamps
cursor and invalidates viewport cache on Reloaded, matching the
existing handle_file_truncated() behavior.

Fixes #1
This commit is contained in:
dailz
2026-06-03 14:47:23 +08:00
parent b3256b2917
commit b6e655bff6
3 changed files with 78 additions and 44 deletions
Download Patch File Download Diff File Expand all files Collapse all files

79
crates/tui/src/app.rs
View File

@@ -859,43 +859,58 @@ impl App {
let width = self.get_content_width();
match &mut self.loading_state {
AppLoadingState::Ready { reader } => {
if let Ok(_new_lines) = reader.update_for_append() {
let _ = reader.save_cache();
let status = reader.update_for_append();
match status {
Ok(
log_viewer_core::io::file_reader::AppendStatus::Appended(_new_lines),
) => {
let _ = reader.save_cache();
let (old_line_count, can_extend) = {
match &reader.state {
log_viewer_core::io::progressive_reader::ReaderState::Ready {
visual_height_index: Some(idx),
..
} => (idx.line_count(), idx.is_valid_for(self.json_format, width)),
_ => (0, false),
}
};
let new_line_count = reader.line_count();
if can_extend && new_line_count > old_line_count {
if let log_viewer_core::io::progressive_reader::ReaderState::Ready {
visual_height_index: Some(index),
reader: fr,
} = &mut reader.state
{
let mut new_heights = Vec::with_capacity(new_line_count - old_line_count);
for i in old_line_count..new_line_count {
let line_text = fr.get_line(i).unwrap_or("");
new_heights.push(compute_line_visual_height(
line_text,
width,
self.json_format,
));
let (old_line_count, can_extend) = {
match &reader.state {
log_viewer_core::io::progressive_reader::ReaderState::Ready {
visual_height_index: Some(idx),
..
} => (idx.line_count(), idx.is_valid_for(self.json_format, width)),
_ => (0, false),
}
index.extend_from_heights(&new_heights);
};
let new_line_count = reader.line_count();
if can_extend && new_line_count > old_line_count {
if let log_viewer_core::io::progressive_reader::ReaderState::Ready {
visual_height_index: Some(index),
reader: fr,
} = &mut reader.state
{
let mut new_heights = Vec::with_capacity(new_line_count - old_line_count);
for i in old_line_count..new_line_count {
let line_text = fr.get_line(i).unwrap_or("");
new_heights.push(compute_line_visual_height(
line_text,
width,
self.json_format,
));
}
index.extend_from_heights(&new_heights);
}
} else {
reader.invalidate_visual_height_index();
reader.start_visual_height_rebuild(width, self.json_format);
}
} else {
self.viewport_cache.invalidate();
}
Ok(log_viewer_core::io::file_reader::AppendStatus::Reloaded) => {
let _ = reader.save_cache();
reader.invalidate_visual_height_index();
reader.start_visual_height_rebuild(width, self.json_format);
self.cursor_line = self.cursor_line.min(self.total_lines().saturating_sub(1));
self.v_sub_offset = 0;
self.viewport_cache.invalidate();
self.clamp_v_offset();
}
self.viewport_cache.invalidate();
Ok(log_viewer_core::io::file_reader::AppendStatus::Unchanged) | Err(_) => {}
}
}
_ => {}
@@ -911,7 +926,9 @@ impl App {
reader.invalidate_visual_height_index();
reader.start_visual_height_rebuild(width, self.json_format);
self.cursor_line = self.cursor_line.min(self.total_lines().saturating_sub(1));
self.v_sub_offset = 0;
self.viewport_cache.invalidate();
self.clamp_v_offset();
}
_ => {}
}