Thanks Javier :-)

Exit code 127 normally means the command is not found rather than that 
the command is found but does not have the correct permissions.  In my 
first post I described trying /usr/sbin/tapeinfo and getting similar 
results.

bacula-sd runs as user bacula and group tape.  "Other" permissions look OK:
# ls -l /usr/sbin/tapeinfo
-rwxr-xr-x 1 root root 44400 Oct 24  2014 /usr/sbin/tapeinfo
# ls -ld /usr/sbin
drwxr-xr-x 2 root root 12288 Apr 18 06:35 /usr/sbin

/usr/sbin/tapeinfo runs as bacula with group tape (after changing 
bacula's shell from /bin/false):

# su -c 'sg tape -c /bin/bash' bacula
bash: cannot set terminal process group (8642): Inappropriate ioctl for 
device
bash: no job control in this shell
$ id
uid=112(bacula) gid=26(tape) groups=26(tape),119(bacula)
$ /usr/sbin/tapeinfo -f /dev/st0
cannot open SCSI device '/dev/st0' - No medium found

I believe I am doing something stupid in the conf file causing bacula-sd 
to attempt to run a command other than (/usr/sbin/)tapeinfo, perhaps 
with a quote included in the name or with the arguments not separated 
from the command word.

Here's the first attempt, copied and pasted from the Main Reference 
(.bu0 means "backup 0"):

# grep '^ .*Alert' bacula-sd.conf.bu0
     Alert Command = "sh -c ’tapeinfo -f %c | grep TapeAlert’

Charles

On 24/04/17 17:57, bacula-users-request AT lists.sourceforge DOT net wrote:
> Date: Tue, 18 Apr 2017 21:13:19 +0200
> From: Francisco Javier Funes Nieto <esencia AT gmail DOT com>
> Subject: Re: [Bacula-users] 7.4.x Device Resource, Alert Command
>       documentation and usage
> Cc: bacula-users <bacula-users AT lists.sourceforge DOT net>
> Message-ID:
>       <CAKWep2Wp8o0D7peBiWP3CpXL0i47rPmTBwrup_SRErxNJBZcow AT mail.gmail DOT 
> com>
> Content-Type: text/plain; charset="utf-8"
>
> Last check, the user that runs the Storage Daemon (maybe bacula) has right
> permissions of tapinfo binary ? Maybe you have to call the tapeinfo with
> the path  (/usr/sbin/tapeinfo) or wherever is located in your system.
>
> J.
>
>
>
> 2017-04-18 19:05 GMT+02:00 Charles <c AT charlesmatkinson DOT org>:
>
>> On 18/04/17 21:19, bacula-users-request AT lists.sourceforge DOT net wrote:
>>> Date: Tue, 18 Apr 2017 09:15:37 +0200
>>> From: Francisco Javier Funes Nieto <esencia AT gmail DOT com>
>>> Subject: Re: [Bacula-users] 7.4.x Device Resource, Alert Command
>>>       documentation and usage
>>> Cc: bacula-users <bacula-users AT lists.sourceforge DOT net>
>>> Message-ID:
>>>       <CAKWep2XU7zBMeC-fouuO4xOb3TN5bzdSx4gbtwFpUY2K=
>> 9W7ag AT mail.gmail DOT com>
>>> Content-Type: text/plain; charset="utf-8"
>>>
>>> Did you check if the mtx package was installed on the system ?
>>>
>>> J.
>>>
>>> 2017-04-18 8:27 GMT+02:00 Charles <c AT charlesmatkinson DOT org>:
>>>
>>>> How should the sample Alert Command using tapeinfo be configured?
>>>>
>>>> In the Bacula Main Reference 7.4.3 (18 June 2016).pdf", section 18.3
>>>> "Device Resource" shows a sample Alert Command:
>>>>
>>>>     Alert Command = "sh -c ?tapeinfo -f %c | grep TapeAlert?"
>>>>
>>>> That was copied and pasted into the Bacula conf but generated:
>>>>
>>>> Alert: -f: 1: -f: ?tapeinfo: not found
>>>> 3997 Bad alert command: sh -c ?tapeinfo -f /dev/sg5 | grep TapeAlert?:
>>>> ERR=Child exited with code 127.
>>>>
>>>> After changing the tapeinfo to /usr/sbin/tapeinfo the error messages
>>>> were similar.
>>>>
>>>> After changing the ? characters to ' characters the error messages were
>>>> similar.
>>>>
>>>> The difficulty was worked around by using an external script to simplify
>>>> the conf:
>>>>
>>>>      Alert Command = "/usr/local/sbin/tapealert-for-bacula.sh"
>>>>
>>>> How should the sample command be configured?
>> Thanks Fransico
>>
>> The mtx package is installed.  At a command prompt ...
>>
>>      tapeinfo -f /dev/sg5 | grep TapeAlert
>>
>> ... runs without error as does:
>>
>>      sh -c 'tapeinfo -f /dev/sg5 | grep TapeAlert'

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