[BusyBox 0001619]: BusyBox 1.8.2 fdisk doesn't read from stdin

[bugs at busybox.net]

A NOTE has been added to this issue. 
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http://busybox.net/bugs/view.php?id=1619 
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Reported By:                vicser
Assigned To:                BusyBox
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Project:                    BusyBox
Issue ID:                   1619
Category:                   Standards Compliance
Reproducibility:            always
Severity:                   major
Priority:                   normal
Status:                     feedback
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Date Submitted:             11-30-2007 01:53 PST
Last Modified:              01-30-2008 12:55 PST
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Summary:                    BusyBox 1.8.2 fdisk doesn't read from stdin
Description: 
busybox is used for unattended Linux installations.
During the installation hard drive is partitioned by means of fdisk.
fdisk is used in a batch mode.
This means text file with fdisk commands is prepared -
see attached fdisk-commands file
(partition size values are variable, fdisk-commands is used to create 3
partitions -boot root and swap).
And then fdisk-commands file is passed to fdisk through the stdin.
Somthing like

fdisk /dev/hda < fdisk-commands

In all busybox till 1.7.3 this works fine
But in busybox 1.8.0-1.8.2 fdisk doesn't read commands from stdin.

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---------------------------------------------------------------------- 
 vda - 12-01-07 19:41  
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Just built busybox 1.8.2 and tested it:

# echo q >Q
# strace -o fdisk.log ./busybox fdisk /dev/sda1 <Q
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF
disklabel
Building a new DOS disklabel. Changes will remain in memory only,
until you decide to write them. After that the previous content
won't be recoverable.

Warning: invalid flag 0x00,0x00 of partition table 4 will be corrected by
w(rite)

Command (m for help): q

#

strace log clearly shows that it did read from stdin:

write(1, "Command (m for help): ", 22)  = 22
read(0, "q", 1)                         = 1
write(1, "q", 1)                        = 1
read(0, "\n", 1)                        = 1
write(1, "\n", 1)                       = 1

Please provide more details (your .config, and strace log of fdisk
invocation which doesn't work for you) 

---------------------------------------------------------------------- 
 iluxa - 01-30-08 12:55  
---------------------------------------------------------------------- 
Apparently this busybox version expects all input to be line-buffered.
As a workaround, calling sync after sending each line will fix the
problem.
(line reading should be fixed instead, of course) 

Issue History 
Date Modified   Username       Field                    Change               
====================================================================== 
11-30-07 01:53  vicser         New Issue                                    
11-30-07 01:53  vicser         Status                   new => assigned     
11-30-07 01:53  vicser         Assigned To               => BusyBox         
11-30-07 01:53  vicser         File Added: fdisk-commands                    
11-30-07 02:04  vicser         Issue Monitored: vicser                      
11-30-07 02:04  vicser         Issue End Monitor: vicser                    
12-01-07 19:41  vda            Note Added: 0002994                          
12-01-07 19:41  vda            Status                   assigned => feedback
01-30-08 12:55  iluxa          Note Added: 0003624                          
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