git-svn: allow --version to work anywhere

Checking the version of the installed SVN libraries should not
require a git repository at all.  This matches the behavior of
"git --version".

Add a test for "git svn help" for the same behavior while we're
at it, too.

Signed-off-by: Eric Wong <e@80x24.org>

git-svn.perl

@@ -339,7 +339,7 @@ sub term_init {
 			die "failed to open $ENV{GIT_DIR}: $!\n";
 		$ENV{GIT_DIR} = $1 if <$fh> =~ /^gitdir: (.+)$/;
 	}
-} else {
+} elsif ($cmd) {
 	my ($git_dir, $cdup);
 	git_cmd_try {
 		$git_dir = command_oneline([qw/rev-parse --git-dir/]);
@@ -356,7 +356,7 @@ sub term_init {
 
 my %opts = %{$cmd{$cmd}->[2]} if (defined $cmd);
 
-read_git_config(\%opts);
+read_git_config(\%opts) if $ENV{GIT_DIR};
 if ($cmd && ($cmd eq 'log' || $cmd eq 'blame')) {
 	Getopt::Long::Configure('pass_through');
 }

t/t9100-git-svn-basic.sh

@@ -19,6 +19,25 @@ case "$GIT_SVN_LC_ALL" in
 	;;
 esac
 
+deepdir=nothing-above
+ceiling=$PWD
+
+test_expect_success 'git svn --version works anywhere' '
+	mkdir -p "$deepdir" && (
+		export GIT_CEILING_DIRECTORIES="$ceiling" &&
+		cd "$deepdir" &&
+		git svn --version
+	)
+'
+
+test_expect_success 'git svn help works anywhere' '
+	mkdir -p "$deepdir" && (
+		export GIT_CEILING_DIRECTORIES="$ceiling" &&
+		cd "$deepdir" &&
+		git svn help
+	)
+'
+
 test_expect_success \
     'initialize git svn' '
 	mkdir import &&