git-svn testsuite: use standard configuration for Subversion tools

I have tweaked configuration in my ~/.subversion directory, namely I am
running auto-properties and automatically adding '$Id$' expansion to
every file.  This choke the last test named 'proplist' from
t9101-git-svn-props.sh, because one more property, svn:keywords is
automatically added.

I had just wrapped svn invocation with the svn_cmd that specifies empty
directory via --config-dir argument.  Since the latter is the global
option, it should be recognized by all svn subcommands, so no
regressions will be introduced.

Now svn_cmd is used everywhere, not just in the failed test module: this
should guard us from the future clashes with user-defined configuration
tweaks.

Signed-off-by: Eygene Ryabinkin <rea-git@codelabs.ru>
Acked-by: Eric Wong <normalperson@yhbt.net>

t/lib-git-svn.sh

@@ -26,6 +26,8 @@ fi
 
 svnrepo=$PWD/svnrepo
 export svnrepo
+svnconf=$PWD/svnconf
+export svnconf
 
 perl -w -e "
 use SVN::Core;
@@ -54,6 +56,19 @@ poke() {
 	test-chmtime +1 "$1"
 }
 
+# We need this, because we should pass empty configuration directory to
+# the 'svn commit' to avoid automated property changes and other stuff
+# that could be set from user's configuration files in ~/.subversion.
+svn_cmd () {
+	[ -d "$svnconf" ] || mkdir "$svnconf"
+	orig_svncmd="$1"; shift
+	if [ -z "$orig_svncmd" ]; then
+		svn
+		return
+	fi
+	svn "$orig_svncmd" --config-dir "$svnconf" "$@"
+}
+
 for d in \
 	"$SVN_HTTPD_PATH" \
 	/usr/sbin/apache2 \