Actions
Bug #10153
closed
File.open block does not throw "No space left on device (Errno::ENOSPC)" if the data fits the buffer of IO.write
Description
When writing to file in disk using File.open with a block as an argument, if the diskspace is full and IO.write does not flush right away, the block just exits successfully instead of throwing Errno:ENOSPC.
Setup: Drive partition needs to be full
Eg. of a write that will succeed normally with no exception given that the drive is full (this means that the expected failure is being swallowed)
File.open('/full_drive/test.txt','wb') do |file|
file.write("test")
end
#This will complete normally because the "test" data does not get flushed
#This will leave a 0kb file on the disk
Eg. force a flush to see the error
File.open('/full_drive/test.txt','wb') do |file|
file.write("test")
file.flush
end
#This will throw Errno::ENOSPC
#This will leave a 0kb file on the disk
Eg. write a large enough data that file.write will flush by itself (most likely it hits the buffer cap)
fills = '1'*1048576
File.open('/full_drive/test.txt','wb') do |file|
file.write(fills)
end
#This will throw Errno::ENOSPC
#This will leave a 0kb file on the disk
Eg. When not using File.open block argument and closing the IO with an ensure block
begin
io = File.open('/full_drive/test.txt', 'wb')
io.write("test")
ensure
io.close
end
#This will throw Errno::ENOSPC
#This will leave a 0kb file on the disk
Currently tested in RHEL5.
Notes:
- I've encountered this in ruby-1.9.2
- I've tested this with ruby-2.1.2
- I'm not sure if the issue is because of File.open usage of c-extension rb_ensure or io_close. reference: (http://ruby-doc.org/core-1.9.3/File.html#method-c-open)
Updated by 
Updated by 
Updated by 
Updated by 
Updated by 
Updated by
Actions
Like0
Like0Like0Like0Like0Like0Like0Like0Like0Like0