taginfo
-------
Runs a program at tag time (usually done to check that the tag name
matches some pattern). Each line is of the form:
REGULAR_EXPRESSION PROGRAM
The program is handed a set group of arguments. In order, they are the
tag name, the operation (see below), the repository, and then as many
file name/revision-number pairs as there are files involved in the tag.
The file/revision pairs are separated by whitespace, like the rest of
the arguments.
The operation is one of `add', `mov', or `del' (`mov' means the -F
option to tag was used).
If PROGRAM exits with nonzero status, the tag operation will not
succeed. (See also the section Note:Shared Syntax in this chapter.)