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The way CVS tagging is currently set up (in particular, the script $CVSROOT/CVSROOT/tagger), you would have to be logged in as glast or glastrm to run the script in "for real" mode.
Proposal: Modify tagger script to allow creation and deletion of tmp tags with names satisfying a pattern. Should be something like HEAD pattern except replace HEAD with string HEADtmp, possibly HEADtmp<stuff> where <stuff> is an arbitrary and optional alphanumeric string if, e.g., we want to distinguish different attempts of creating HEAD of a particular version. DONE but, as of 1.11, temp tags are no longer used.
Certain assumptions are hard-coded in the script when, ideally, they should come from the RM database: for example, exact format of tags. These things don't change very fast, if at all, but if they do, someone will have to remember to update the script.