| Description | BareOS Counter Resources do not automatically increment themselves; this must be done by nudging the corresponding counter variable appropriately. In addition, one must know the exact syntax to to use.
Merely creating a tape label with, e.g.:
Label Format = "DIFF-$DiffSeq"
does NOT increment the value of "DiffSeq," which will cause backups to error and send annoying intervention emails. The error indicates that the director could not find an appendable volume.
There does not appear to be documentation on how to actually use counter variables corresponding to Counter Resources. I searched high and low for hours and only discovered the solution by examining a google hit on Bacula, not BareOS. Apparently, Bacula has some sophisticated facilities for generating tape labels from counter variables; I have not tried them all. However, the Bacula documentation on this topic was enough (along with my own experience and knowledge of *nix-type systems) to help me figure out how to do something similar in BareOS. I changed the directive to:
Label Format = "DIFF-${DiffSeq+}"
Note that the plus sign (the '+') MUST be INSIDE the curly braces. I have not tried padding and other features the Bacula documentation discusses as I feel I have spent enough time on this already. I use "faux" padding by starting my sequences in the Counter Resource at 1000; this is satisfactory for my own use. Others might try experimenting with some other features, if they are implemented in Bareos also.
BTW, Counter Variables really do work in BareOS. The secret is knowing exactly how to use them.
The Bacula doc on this topic is at: https://www.bacula.org/9.0.x-manuals/en/misc/Variable_Expansion.html
I think an update to the BareOS documentation on the use, very specifically, of counter variables would be appropriate.
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