$2 in start-commit empty

I guess this this email shows my ignorance, but having found a little
bit more than nothing in the book, I figured I'd ask.

I'm accessing a repository over the svn: protocol, and it looks like
start-commit only receives one argument, or $2 is null.

1. Is this correct?
2. Under what circumstances is it supposed to contain a username?

My start-commit:

#!/bin/sh

REPOS="$1"
USER="$2"

echo "@: '$@'" > /dev/stderr
echo "REPOS: '$REPOS'" > /dev/stderr
echo "USER: '$USER'" > /dev/stderr
exit 15
 
roman_at_freepuppy ~/tmp 1078:0 > svn import svn://localhost/repos . -m 'test'
svn: A repository hook failed.
svn: 'start-commit' hook failed with error output:
@: '/home/svn/repos '
REPOS: '/home/svn/repos'
USER: ''

roman@freepuppy ~/tmp 1078:1 >

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