git-svn: add ability to specify --commit-url for dcommit

This allows one to use public svn:// URLs for fetch and
svn+ssh:// URLs for committing (without using the complicated
rewriteRoot option, reimporting or git-filter-branch).

Using this can also help avoid unnecessary server
authentication/encryption overhead on busy SVN servers.

Along with the new --revision option, this can also be allowed
to override the branch detection in dcommit, too.  This is
potentially dangerous and not recommended!  (And also purposely
undocumented, but the loaded gun is there in case somebody
wants to make it safe).
Signed-off-by: NEric Wong <normalperson@yhbt.net>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

Documentation/git-svn.txt

@@ -138,6 +138,15 @@ and have no uncommitted changes.
 +
 --no-rebase;;
 	After committing, do not rebase or reset.
+--commit-url <URL>;;
+	Commit to this SVN URL (the full path).  This is intended to
+	allow existing git-svn repositories created with one transport
+	method (e.g. `svn://` or `http://` for anonymous read) to be
+	reused if a user is later given access to an alternate transport
+	method (e.g. `svn+ssh://` or `https://`) for commit.
+
+	Using this option for any other purpose (don't ask)
+	is very strongly discouraged.
 --
 
 'log'::

git-svn.perl

@@ -66,7 +66,7 @@ BEGIN
 	$_version, $_fetch_all, $_no_rebase,
 	$_merge, $_strategy, $_dry_run, $_local,
 	$_prefix, $_no_checkout, $_url, $_verbose,
-	$_git_format);
+	$_git_format, $_commit_url);
 $Git::SVN::_follow_parent = 1;
 my %remote_opts = ( 'username=s' => \$Git::SVN::Prompt::_username,
                     'config-dir=s' => \$Git::SVN::Ra::config_dir,
@@ -127,6 +127,8 @@ BEGIN
 			  'verbose|v' => \$_verbose,
 			  'dry-run|n' => \$_dry_run,
 			  'fetch-all|all' => \$_fetch_all,
+			  'commit-url=s' => \$_commit_url,
+			  'revision|r=i' => \$_revision,
 			  'no-rebase' => \$_no_rebase,
 			%cmt_opts, %fc_opts } ],
 	'set-tree' => [ \&cmd_set_tree,
@@ -416,6 +418,8 @@ sub cmd_dcommit {
 	$head ||= 'HEAD';
 	my @refs;
 	my ($url, $rev, $uuid, $gs) = working_head_info($head, \@refs);
+	$url = $_commit_url if defined $_commit_url;
+	my $last_rev = $_revision if defined $_revision;
 	if ($url) {
 		print "Committing to $url ...\n";
 	}
@@ -423,7 +427,6 @@ sub cmd_dcommit {
 		die "Unable to determine upstream SVN information from ",
 		    "$head history.\nPerhaps the repository is empty.";
 	}
-	my $last_rev;
 	my ($linear_refs, $parents) = linearize_history($gs, \@refs);
 	if ($_no_rebase && scalar(@$linear_refs) > 1) {
 		warn "Attempting to commit more than one change while ",
@@ -446,7 +449,7 @@ sub cmd_dcommit {
 			my $cmt_rev;
 			my %ed_opts = ( r => $last_rev,
 			                log => get_commit_entry($d)->{log},
-			                ra => Git::SVN::Ra->new($gs->full_url),
+			                ra => Git::SVN::Ra->new($url),
 			                config => SVN::Core::config_get_config(
 			                        $Git::SVN::Ra::config_dir
 			                ),