svncommands: fix layering violation & tweak error messages. Importing `SubversionException' directly from `svn.core' is a layering violation: Anything within the Subversion bindings should only be accessed via svnwrap. The advantages to doing this are twofold: we only need to intercept missing bindings in one place, and we have the option of supporting alternate bindings. As an added bonus, the recently-added support for intercepting missing Subversion bindings actually works. Two error messages are tweaked to remove `It appears...' from one error message (just blaming Subversion instead) and make both errors include the URL in the suggested command line.

#!/bin/sh
#
# Generate simple_branch.svndump
#

mkdir temp
cd temp

mkdir project-orig
cd project-orig
mkdir trunk branches tags
cd ..

svnadmin create testrepo
svnurl=file://`pwd`/testrepo
svn import --username durin project-orig $svnurl -m "Empty dirs."

svn co $svnurl project
cd project
echo 'file: alpha' > trunk/alpha
svn add trunk/alpha
svn ci --username durin -m 'Add alpha'
echo 'Data of beta' > trunk/beta
svn add trunk/beta
svn ci --username durin -m 'Add beta'
svn up
svn cp trunk branches/the_branch
svn ci --username durin -m 'Make a branch'
cd ..

svnadmin dump testrepo > ../simple_branch.svndump