Possible bug with atd?

[Steven Haigh]

Hi all,

I'm not 100% sure if this is a bug, or something I'm doing wrong...

I'm trying to schedule some dvb recording via a web page using atd. I  
can get the jobs to appear in 'at -l', however when it comes time for  
the job to execute, it just disappears. *poof* gone. No logs, no  
command executed, no nothing.

I'm trying to launch a bash file that does a heap of funky things -  
but not having much luck. If i type in the command manually, it all  
works like a treat.

I am setting the job in PHP by using:
$cmd = "at $starttime $whatday << COMMAND\n/home/netwiz/bin/capture  
'$channel' $duration\nCOMMAND";

and if I check what the job is, I get such:
# at -c 11
#!/bin/sh
# atrun uid=48 gid=48
# mail     root 0
umask 22
HOSTNAME=asterisk.crc.id.au; export HOSTNAME
SHELL=/bin/bash; export SHELL
HISTSIZE=1000; export HISTSIZE
USER=root; export USER
LS_COLORS=no=00:fi=00:di=01\;34:ln=01\;36:pi=40\;33:so=01\;35:bd=40\; 
33\;01:cd=40\;33\;01:or=01\;05\;37\;41:mi=01\;05\;37\;41:ex=01\;32: 
\*.cmd=01\;32:\*.exe=01\;32:\*.com=01\;32:\*.btm=01\;32:\*.bat=01\;32: 
\*.sh=01\;32:\*.csh=01\;32:\*.tar=01\;31:\*.tgz=01\;31:\*.arj=01\;31: 
\*.taz=01\;31:\*.lzh=01\;31:\*.zip=01\;31:\*.z=01\;31:\*.Z=01\;31: 
\*.gz=01\;31:\*.bz2=01\;31:\*.bz=01\;31:\*.tz=01\;31:\*.rpm=01\;31: 
\*.cpio=01\;31:\*.jpg=01\;35:\*.gif=01\;35:\*.bmp=01\;35:\*.xbm=01\; 
35:\*.xpm=01\;35:\*.png=01\;35:\*.tif=01\;35:; export LS_COLORS
PATH=/sbin:/usr/sbin:/bin:/usr/bin; export PATH
MAIL=/var/spool/mail/root; export MAIL
PWD=/var/www/html/tv; export PWD
INPUTRC=/etc/inputrc; export INPUTRC
LANG=C; export LANG
HOME=/root; export HOME
SHLVL=4; export SHLVL
LOGNAME=root; export LOGNAME
CVS_RSH=ssh; export CVS_RSH
LESSOPEN=\|/usr/bin/lesspipe.sh\ %s; export LESSOPEN
G_BROKEN_FILENAMES=1; export G_BROKEN_FILENAMES
cd /var/www/html/tv || {
          echo 'Execution directory inaccessible' >&2
          exit 1
}
${SHELL:-/bin/sh} << `(dd if=/dev/urandom count=200 bs=1 2>/dev/null| 
LC_ALL=C tr -d -c '[:alnum:]')`

/home/netwiz/bin/capture '7 HD Digital' 30

Now this seems to be correct - but as I said, the job just seems to  
disappear. Is there something I'm missing, or is this a bug?

--
Steven Haigh

Email: netwiz(a)crc.id.au
Web: http://www.crc.id.au
Phone: [phone]

[Jason Vas Dias]

On Thursday 02 March 2006 12:53, Steven Haigh <netwiz(a)crc.id.au&gt; wrote:
>   Hi all,
>   
>   I'm not 100% sure if this is a bug, or something I'm doing wrong...
>   
>   I'm trying to schedule some dvb recording via a web page using atd. I  
>   can get the jobs to appear in 'at -l', however when it comes time for  
>   the job to execute, it just disappears. *poof* gone. No logs, no  
>   command executed, no nothing.
>   
>   I'm trying to launch a bash file that does a heap of funky things -  
>   but not having much luck. If i type in the command manually, it all  
>   works like a treat.
>   
>   I am setting the job in PHP by using:
>   $cmd = "at $starttime $whatday << COMMAND\n/home/netwiz/bin/capture  
>   '$channel' $duration\nCOMMAND";
>   
>   and if I check what the job is, I get such:
>   # at -c 11
>   #!/bin/sh
>   # atrun uid=48 gid=48
>   # mail     root 0
>   umask 22
>   HOSTNAME=asterisk.crc.id.au; export HOSTNAME
>   SHELL=/bin/bash; export SHELL
>   HISTSIZE=1000; export HISTSIZE
>   USER=root; export USER
>   LS_COLORS=no=00:fi=00:di=01\;34:ln=01\;36:pi=40\;33:so=01\;35:bd=40\; 
>   33\;01:cd=40\;33\;01:or=01\;05\;37\;41:mi=01\;05\;37\;41:ex=01\;32: 
>   \*.cmd=01\;32:\*.exe=01\;32:\*.com=01\;32:\*.btm=01\;32:\*.bat=01\;32: 
>   \*.sh=01\;32:\*.csh=01\;32:\*.tar=01\;31:\*.tgz=01\;31:\*.arj=01\;31: 
>   \*.taz=01\;31:\*.lzh=01\;31:\*.zip=01\;31:\*.z=01\;31:\*.Z=01\;31: 
>   \*.gz=01\;31:\*.bz2=01\;31:\*.bz=01\;31:\*.tz=01\;31:\*.rpm=01\;31: 
>   \*.cpio=01\;31:\*.jpg=01\;35:\*.gif=01\;35:\*.bmp=01\;35:\*.xbm=01\; 
>   35:\*.xpm=01\;35:\*.png=01\;35:\*.tif=01\;35:; export LS_COLORS
>   PATH=/sbin:/usr/sbin:/bin:/usr/bin; export PATH
>   MAIL=/var/spool/mail/root; export MAIL
>   PWD=/var/www/html/tv; export PWD
>   INPUTRC=/etc/inputrc; export INPUTRC
>   LANG=C; export LANG
>   HOME=/root; export HOME
>   SHLVL=4; export SHLVL
>   LOGNAME=root; export LOGNAME
>   CVS_RSH=ssh; export CVS_RSH
>   LESSOPEN=\|/usr/bin/lesspipe.sh\ %s; export LESSOPEN
>   G_BROKEN_FILENAMES=1; export G_BROKEN_FILENAMES
>   cd /var/www/html/tv || {
>             echo 'Execution directory inaccessible' >&2
>             exit 1
>   }
>   ${SHELL:-/bin/sh} << `(dd if=/dev/urandom count=200 bs=1 2>/dev/null| 
>   LC_ALL=C tr -d -c '[:alnum:]')`
>   
>   /home/netwiz/bin/capture '7 HD Digital' 30
>   
>   Now this seems to be correct - but as I said, the job just seems to  
>   disappear. Is there something I'm missing, or is this a bug?
>   
>   --
>   Steven Haigh
>   
>   Email: netwiz(a)crc.id.au
>   Web: http://www.crc.id.au
>   Phone: [phone]
>   
>   
>    
You are submitting the job as userid 48, gid 48 -
does the command normally work OK as a non root userid ?
(The device read by the "capture" command must have appropriate
 privileges if you're not running it as root - 
 which device / what privileges?)
Does the at-job work if submitted as root ?
Do you have SELinux in Enforcing mode ?
If so, does the at job work after doing 'setenforce 0' ? 
Try changing the command to:
  /home/netwiz/bin/capture '7 HD Digital' 30 || echo "FAILED: $?"
that should generate some mail with the exit status if it fails.
Regards,
Jason Vas Dias
at package maintainer
Red Hat Inc.

[Steven Haigh]

On 03/03/2006, at 5:03 AM, Jason Vas Dias wrote:
>  On Thursday 02 March 2006 12:53, Steven Haigh
> <netwiz(a)crc.id.au&gt;  
>  wrote:
> >  Hi all,
> >
> >  I'm not 100% sure if this is a bug, or something I'm doing wrong...
> >
> >  I'm trying to schedule some dvb recording via a web page using  
> > atd. I
> >  can get the jobs to appear in 'at -l', however when it comes time  
> > for
> >  the job to execute, it just disappears. *poof* gone. No logs, no
> >  command executed, no nothing.
> >
> >  I'm trying to launch a bash file that does a heap of funky things -
> >  but not having much luck. If i type in the command manually, it all
> >  works like a treat.
> >
> >  I am setting the job in PHP by using:
> >  $cmd = "at $starttime $whatday << COMMAND\n/home/netwiz/bin/capture
> >  '$channel' $duration\nCOMMAND";
> > -----8<-----------
>  You are submitting the job as userid 48, gid 48 -
>  does the command normally work OK as a non root userid ?
>  (The device read by the "capture" command must have appropriate
>   privileges if you're not running it as root -
>   which device / what privileges?)
>  Does the at-job work if submitted as root ?
>  Do you have SELinux in Enforcing mode ?
>  If so, does the at job work after doing 'setenforce 0' ?
>  Try changing the command to:
>    /home/netwiz/bin/capture '7 HD Digital' 30 || echo "FAILED: $?"
>  that should generate some mail with the exit status if it fails. 
Ok, I found the issue - it was actually a multiple of things that I'd  
overlooked. I wasn't getting the email because sendmail wasn't  
started on that machine - which when I started, I got a flood of  
email hit my inbox - logwatchs' from 4 days ago etc :)

it turns out that because apache has a limited PATH, one of the  
commands (zapdvb to be exact) lived in /usr/local/bin - however this  
wasn't in apache's path for the at job. So, I added the full path  
name to the script, and now everything works.

Sorry about the false alarm - it's something dead simple that I'm  
embarrassed I overlooked :)

--
Steven Haigh

Email: netwiz(a)crc.id.au
Web: http://www.crc.id.au
Phone: [phone]