Re: why two dashes in extension load files

tgl(at)sss(dot)pgh(dot)pa(dot)us (Tom Lane) writes:
> Peter Eisentraut <peter_e(at)gmx(dot)net> writes:
>> On mån, 2011-02-14 at 10:13 -0500, Tom Lane wrote:
>>> Peter Eisentraut <peter_e(at)gmx(dot)net> writes:
>>>> Why do the extension load files need two dashes, like xml2--1.0.sql?
>>>> Why isn't one enough?
>
>>> Because we'd have to forbid dashes in extension name and version
>>> strings. This was judged to be a less annoying solution. See
>>> yesterday's discussion.
>
>> I'm not convinced. There was nothing in that discussion why any
>> particular character would have to be allowed in a version number.
>
> Well, there's already a counterexample in the current contrib stuff:
> uuid-ossp. We could rename that to uuid_ossp of course, but it's
> not clear to me that there's consensus for forbidding dashes here.

I suspect that "_" might be troublesome.

Let me observe on Debian policy... It requires that package names
consist as follows:

Package names (both source and binary, see Package, Section 5.6.7)
must consist only of lower case letters (a-z), digits (0-9), plus (+)
and minus (-) signs, and periods (.). They must be at least two
characters long and must start with an alphanumeric character.

http://www.debian.org/doc/debian-policy/ch-controlfields.html#s-f-Source

I suspect that we'll need to have a policy analagous to that.

Also worth observing: Debian package files are of the form:
"${package}_${version}-${dversion}_${arch}.deb"

where package and version have fairly obvious interpretation, and...
- dversion indicates a sequence handled by Debian
- arch indicates CPU architecture (i386, amd64, ...)

Probably the dversion/arch bits aren't of interest to us, but the
remainder of the notation used by Debian seems not inapplicable for us.
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