topic bug in dodisk in Operating System - HP-UX

bug in dodisk

marc seguin — Thu, 15 Apr 2004 12:56:16 GMT

I noticed a bug in the script /usr/sbin/acct/dodisk.

If you get a message like :
"Syntax error at line 1 : `(' is not expected"
the error comes from the line :
"# See fstab(4) and sam(1M) for further details on configuring devices."
in /etc/fstab which is not treated well by the awk script in dodisk. (cf. note 1)

You can modify the dodisk script :
replace "if (access(diskusg))" [line 64 on HP 11.11]
by "if (access(diskusg)==1)"

But there is another BIGGER BUG. This script shouldn't look for commented lines but it does it. And, as a result, if you comment out a line in the middle of /etc/fstab, you can't get the diskusage for file systems under this line (cf. note 2).

So, instead of the correction above, it is better to do this one :
After the line
"\$3 !~ /swap/ \" [line 51 on HP 11.11]
you can add :
"&& \$1 !~ /^#/ \"

It can help before HP correct it.
Will HP be inform on the bug through this forum, or should I use another procedure ?

HTH
Marc.

Re: bug in dodisk

marc seguin — Thu, 15 Apr 2004 13:00:52 GMT

Note 1 :

The line :
"# See fstab(4) and sam(1M) for further details on configuring devices."
leads the awk script to test if the command :
"/usr/lbin/fs/fstab(4)/diskusg"
exists, which is not true of course. And it should return a 0 code. But, because of the '(', it returns code 2, which is non null, so the test is OK.
And the script tries to execute it !!!

CQFD

Re: bug in dodisk

marc seguin — Thu, 15 Apr 2004 13:07:29 GMT

Note 2 :

If your /etc/fstab looks like :

/dev/vg00/lvol4 /opt vxfs delaylog 0 2
/dev/vg00/lvol5 /tmp vxfs delaylog 0 2
#/dev/vg00/lvol6 /usr vxfs delaylog 0 2
/dev/vg00/lvol7 /var vxfs delaylog 0 2

[it is an exemple, it is not realistic]

So the awk script will try to execute :
/usr/lbin/fs/vxfs/diskusg /dev/vg00/lvol4 /dev/vg00/lvol5 #/dev/vg00/lvol6 /dev/vg00/lvol7
And because of the '#', the end of the line won't be concerned, though it should.

And you'll get disk usage of two file systems instead of three available !!!

CQFD