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Commit1bab7ba

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committed
tail: show end of device
gnu coreutils will show end of device for block devices.In current implementation this is skipped as a block devicesare recognized as untailable.The change ensures that we first try to output the end of anyfile and only then tell the observer that the file is notobservable.
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1 file changed

+15
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‎src/uu/tail/src/tail.rs

Lines changed: 15 additions & 10 deletions
Original file line numberDiff line numberDiff line change
@@ -140,28 +140,35 @@ fn tail_file(
140140
returnOk(());
141141
}
142142
observer.add_bad_path(path, input.display_name.as_str(),false)?;
143-
}elseif input.is_tailable(){
143+
}else{
144144
let metadata = path.metadata().ok();
145145
matchFile::open(path){
146146
Ok(mut file) =>{
147147
header_printer.print_input(input);
148148
letmut reader;
149+
let is_file_with_no_blocks = metadata
150+
.as_ref()
151+
.map_or(false, |m| m.file_type().is_file() && m.get_block_size() ==0);
149152
if !settings.presume_input_pipe
150153
&& file.is_seekable(if input.is_stdin(){ offset}else{0})
151-
&&metadata.as_ref().unwrap().get_block_size() >0
154+
&&!is_file_with_no_blocks
152155
{
153156
bounded_tail(&mut file, settings);
154157
reader =BufReader::new(file);
155158
}else{
156159
reader =BufReader::new(file);
157160
unbounded_tail(&mut reader, settings)?;
158161
}
159-
observer.add_path(
160-
path,
161-
input.display_name.as_str(),
162-
Some(Box::new(reader)),
163-
true,
164-
)?;
162+
if input.is_tailable(){
163+
observer.add_path(
164+
path,
165+
input.display_name.as_str(),
166+
Some(Box::new(reader)),
167+
true,
168+
)?;
169+
}else{
170+
observer.add_bad_path(path, input.display_name.as_str(),false)?;
171+
}
165172
}
166173
Err(e)if e.kind() ==ErrorKind::PermissionDenied =>{
167174
observer.add_bad_path(path, input.display_name.as_str(),false)?;
@@ -176,8 +183,6 @@ fn tail_file(
176183
}));
177184
}
178185
}
179-
}else{
180-
observer.add_bad_path(path, input.display_name.as_str(),false)?;
181186
}
182187

183188
Ok(())

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