cherry-pick: handle root commits with external strategies

diff --git a/strbuf.h b/strbuf.h
index 4ce7dedee07efced23c1214de71e0687d7cb297a..07060ce893d8303b7eb4d78db0f7a5575527f88f 100644 (file)
--- a/strbuf.h
+++ b/strbuf.h
@@ -85,6 +85,8 @@ extern void strbuf_addbuf_percentquote(struct strbuf *dst, const struct strbuf *
 
 __attribute__((format (printf,2,3)))
 extern void strbuf_addf(struct strbuf *sb, const char *fmt, ...);
+__attribute__((format (printf,2,0)))
+extern void strbuf_vaddf(struct strbuf *sb, const char *fmt, va_list ap);
 
 extern size_t strbuf_fread(struct strbuf *, size_t, FILE *);
 /* XXX: if read fails, any partial read is undone */