api-credential.txt: document that helpers field is filled-in automatically

diff --git a/transport-helper.c b/transport-helper.c
index 07131261fefeab2066636a7f83bce05796329a54..f6b3b1fb79468ef85eb9581c7d44ff04c1bb61bc 100644 (file)
--- a/transport-helper.c
+++ b/transport-helper.c
@@ -9,6 +9,7 @@
 #include "remote.h"
 #include "string-list.h"
 #include "thread-utils.h"
+#include "sigchain.h"
 
 static int debug;
 
@@ -220,15 +221,21 @@ static struct child_process *get_helper(struct transport *transport)
 static int disconnect_helper(struct transport *transport)
 {
        struct helper_data *data = transport->data;
-       struct strbuf buf = STRBUF_INIT;
        int res = 0;
 
        if (data->helper) {
                if (debug)
                        fprintf(stderr, "Debug: Disconnecting.\n");
                if (!data->no_disconnect_req) {
-                       strbuf_addf(&buf, "\n");
-                       sendline(data, &buf);
+                       /*
+                        * Ignore write errors; there's nothing we can do,
+                        * since we're about to close the pipe anyway. And the
+                        * most likely error is EPIPE due to the helper dying
+                        * to report an error itself.
+                        */
+                       sigchain_push(SIGPIPE, SIG_IGN);
+                       xwrite(data->helper->in, "\n", 1);
+                       sigchain_pop(SIGPIPE);
                }
                close(data->helper->in);
                close(data->helper->out);
@@ -446,8 +453,10 @@ static int fetch_with_import(struct transport *transport,
                        private = apply_refspecs(data->refspecs, data->refspec_nr, posn->name);
                else
                        private = xstrdup(posn->name);
-               read_ref(private, posn->old_sha1);
-               free(private);
+               if (private) {
+                       read_ref(private, posn->old_sha1);
+                       free(private);
+               }
        }
        strbuf_release(&buf);
        return 0;