git-svnimport: Parse log message for Signed-off-by: lines

This add '-S' option. When specified svn-import will try to parse
commit message for 'Signed-off-by: ...' line, and if found will use
the name and email address extracted at first occurrence as this commit
author name and author email address. Committer name and email are
extracted in usual way.
Signed-off-by: NSasha Khapyorsky <sashak@voltaire.com>
Signed-off-by: NJunio C Hamano <junkio@cox.net>

git-svnimport.perl

@@ -31,7 +31,7 @@
 $ENV{'TZ'}="UTC";
 
 our($opt_h,$opt_o,$opt_v,$opt_u,$opt_C,$opt_i,$opt_m,$opt_M,$opt_t,$opt_T,
-    $opt_b,$opt_r,$opt_I,$opt_A,$opt_s,$opt_l,$opt_d,$opt_D);
+    $opt_b,$opt_r,$opt_I,$opt_A,$opt_s,$opt_l,$opt_d,$opt_D,$opt_S);
 
 sub usage() {
 	print STDERR <<END;
@@ -39,12 +39,12 @@ ()
        [-o branch-for-HEAD] [-h] [-v] [-l max_rev]
        [-C GIT_repository] [-t tagname] [-T trunkname] [-b branchname]
        [-d|-D] [-i] [-u] [-r] [-I ignorefilename] [-s start_chg]
-       [-m] [-M regex] [-A author_file] [SVN_URL]
+       [-m] [-M regex] [-A author_file] [-S] [SVN_URL]
 END
 	exit(1);
 }
 
-getopts("A:b:C:dDhiI:l:mM:o:rs:t:T:uv") or usage();
+getopts("A:b:C:dDhiI:l:mM:o:rs:t:T:Suv") or usage();
 usage if $opt_h;
 
 my $tag_name = $opt_t || "tags";
@@ -531,21 +531,30 @@ ($$$$$$$$)
 
 sub commit {
 	my($branch, $changed_paths, $revision, $author, $date, $message) = @_;
-	my($author_name,$author_email,$dest);
+	my($committer_name,$committer_email,$dest);
+	my($author_name,$author_email);
 	my(@old,@new,@parents);
 
 	if (not defined $author or $author eq "") {
-		$author_name = $author_email = "unknown";
+		$committer_name = $committer_email = "unknown";
 	} elsif (defined $users_file) {
 		die "User $author is not listed in $users_file\n"
 		    unless exists $users{$author};
-		($author_name,$author_email) = @{$users{$author}};
+		($committer_name,$committer_email) = @{$users{$author}};
 	} elsif ($author =~ /^(.*?)\s+<(.*)>$/) {
-		($author_name, $author_email) = ($1, $2);
+		($committer_name, $committer_email) = ($1, $2);
 	} else {
 		$author =~ s/^<(.*)>$/$1/;
-		$author_name = $author_email = $author;
+		$committer_name = $committer_email = $author;
+	}
+
+	if ($opt_S && $message =~ /Signed-off-by:\s+(.*?)\s+<(.*)>\s*\n/) {
+		($author_name, $author_email) = ($1, $2);
+	} else {
+		$author_name = $committer_name;
+		$author_email = $committer_email;
 	}
+
 	$date = pdate($date);
 
 	my $tag;
@@ -772,8 +781,8 @@ sub commit {
 				"GIT_AUTHOR_NAME=$author_name",
 				"GIT_AUTHOR_EMAIL=$author_email",
 				"GIT_AUTHOR_DATE=".strftime("+0000 %Y-%m-%d %H:%M:%S",gmtime($date)),
-				"GIT_COMMITTER_NAME=$author_name",
-				"GIT_COMMITTER_EMAIL=$author_email",
+				"GIT_COMMITTER_NAME=$committer_name",
+				"GIT_COMMITTER_EMAIL=$committer_email",
 				"GIT_COMMITTER_DATE=".strftime("+0000 %Y-%m-%d %H:%M:%S",gmtime($date)),
 				"git-commit-tree", $tree,@par);
 			die "Cannot exec git-commit-tree: $!\n";
@@ -825,7 +834,7 @@ sub commit {
 		print $out ("object $cid\n".
 		    "type commit\n".
 		    "tag $dest\n".
-		    "tagger $author_name <$author_email>\n") and
+		    "tagger $committer_name <$committer_email>\n") and
 		close($out)
 		    or die "Cannot create tag object $dest: $!\n";