fast-import: don't fail on omitted committer name

fast-import format declares 'committer_name SP' to be optional in
'committer_name SP LT email GT'. But for a (commit) object SP is
obligatory while zero length committer_name is ok. git-fsck checks
that SP is present, so fast-import must prepend it if the name SP
part is omitted. It doesn't do so and thus for "LT email GT" ident
it writes a bad object.

Name cannot contain LT or GT, ident always comes after SP in fast-import.
So if ident starts with LT reuse the SP as if a valid 'SP LT email GT'
ident was passed.

This fixes a ident parsing bug for a well-formed fast-import input.
Though the parsing is still loose and can accept a ill-formed input.

Signed-off-by: Dmitry Ivankov <divanorama@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/fast-import.c b/fast-import.c
index 78d9786..c07f155 100644
--- a/fast-import.c
+++ b/fast-import.c
@@ -1971,6 +1971,10 @@
 	size_t name_len;
 	char *ident;
 
+	/* ensure there is a space delimiter even if there is no name */
+	if (*buf == '<')
+		--buf;
+
 	gt = strrchr(buf, '>');
 	if (!gt)
 		die("Missing > in ident string: %s", buf);