git-svn: documentation updates

* Clarify that 'init' requires an argument
* Remove instances of 'SVN_URL' in the manpage, it's not an
  environment variable.
* Refer to 'Additional Fetch Arguments' when documenting 'fetch'
* document --authors-file / -A option

Thanks to Pavel Roskin and Seth Falcon for bringing these issues
to my attention.

Signed-off-by: Eric Wong <normalperson@yhbt.net>
Signed-off-by: Junio C Hamano <junkio@cox.net>

1 files changed, 4 insertions, 2 deletions

diff --git a/contrib/git-svn/git-svn.perl b/contrib/git-svn/git-svn.perl
index 7c44450d7..e003501be 100755
--- a/contrib/git-svn/git-svn.perl
+++ b/contrib/git-svn/git-svn.perl
@@ -42,7 +42,8 @@ my %fc_opts = ( 'no-ignore-externals' => \$_no_ignore_ext,
 my %cmd = (
 	fetch => [ \&fetch, "Download new revisions from SVN",
 			{ 'revision|r=s' => \$_revision, %fc_opts } ],
-	init => [ \&init, "Initialize and fetch (import)", { } ],
+	init => [ \&init, "Initialize a repo for tracking" .
+			  " (requires URL argument)", { } ],
 	commit => [ \&commit, "Commit git revisions to SVN",
 			{	'stdin|' => \$_stdin,
 				'edit|e' => \$_edit,
@@ -220,7 +221,8 @@ when you have upgraded your tools and habits to use refs/remotes/$GIT_SVN
 }
 
 sub init {
-	$SVN_URL = shift or croak "SVN repository location required\n";
+	$SVN_URL = shift or die "SVN repository location required " .
+				"as a command-line argument\n";
 	unless (-d $GIT_DIR) {
 		sys('git-init-db');
 	}