[Glass] How to hook on tODE backup verification?

[Dale Henrichs via Glass]

On 02/15/2017 05:14 AM, Mariano Martinez Peck via Glass wrote:
> Hi Dale,
>
> I have a bash script that takes care of my stone backups. In a part of 
> such a script I do:
>
>
> echo "`date` ------------------------ Starting backup of 
> ${GEMSTONE_NAME} ------------------------" >> 
> $GEMSTONE_LOGDIR/${GEMSTONE_NAME}_backup.log
> $GS_HOME/bin/todeIt $stoneName bu backup --wait --commit $backupfile 
>  >> $GEMSTONE_LOGDIR/${GEMSTONE_NAME}_backup.log 2>&1
>
> The thing is that just after this, I proceed to delete unneeded 
> tranlogs for the new created backup. So I would delete all extents not 
> needed by $backupfile. The problem is that this is too risky (delete 
> the tranlogs) if the backup didn't finish correctly.*I know you do 
> validate the backup in tODE, but I wonder how can I hook on that 
> answer?  Do you do some kind of `exit`? *
>
> I was planning to do something like this:
>
> $GS_HOME/bin/todeIt $stoneName bu backup --wait --commit $backupfile 
>  >> $GEMSTONE_LOGDIR/${GEMSTONE_NAME}_backup.log 2>&1
> if [ $? -eq 0 ]
> then
>   echo "Cool, let's remove tranlogs"
> else
>   echo "Ups...something was wring with backups...let's skip deleting 
> tranlogs
> fi
>
>
> Sorry to ask but it's not that easy to reproduce a backup failure hahah.
>
> Thanks in advance,
>
copydbf is used to validate the backup ... technically, this is only  a 
partial validation, since it does not actually perform the backup 
itself, but it does ensure that the file is not corrupt ... if copydbf 
hits an error reading the file, it exits with a non-zero status code:

foos:allen_340_e>copydbf info.ston /dev/null
GemStone is unable to read the file info.ston

foos:allen_340_e>echo $?
3

For the backup, copydbf is invoked with 
TDGemStoneTool>>copydbf:forFilePath: and the perform on server call used 
will check the exit status and signal an error and todeIt will exit with 
a non-zero status if the Smalltalk code throws an error, so your 
suggested technique will do the trick ...

Dale


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