Find libc's write when git writes first

A Lua build replaces write, and git can write before cmd_main reaches
cgit_init_filters, as it does when GIT_TRACE2 is set, which called
through a null pointer and crashed every request.

1 file changed, 4 insertions, 0 deletions

diff --git a/source/filter.c b/source/filter.cindex 43ba70a..f2dfe12 100644--- a/source/filter.c+++ b/source/filter.c@@ -166,6 +166,10 @@ void cgit_init_filters(void)  */ ssize_t write(int fd, const void *buf, size_t count) {+	// Git can write before cmd_main reaches cgit_init_filters, to a trace+	// target for one, so libc's write may still need looking up here.+	if (!libc_write)+		cgit_init_filters(); 	if (fd != STDOUT_FILENO || !filter_write) 		return libc_write(fd, buf, count); 	return filter_write(current_write_filter, buf, count);
diff --git a/source/filter.c b/source/filter.c
index 43ba70a..f2dfe12 100644
--- a/source/filter.c
+++ b/source/filter.c
@@ -166,6 +166,10 @@ void cgit_init_filters(void)
  */
 ssize_t write(int fd, const void *buf, size_t count)
 {
+	// Git can write before cmd_main reaches cgit_init_filters, to a trace
+	// target for one, so libc's write may still need looking up here.
+	if (!libc_write)
+		cgit_init_filters();
 	if (fd != STDOUT_FILENO || !filter_write)
 		return libc_write(fd, buf, count);
 	return filter_write(current_write_filter, buf, count);