The credential subsystem can trigger SIGPIPE when writing to an
external helper if that helper closes its stdin before reading the
whole input. Normally this is rare, since helpers would need to read
that input to make a decision about how to respond, but:
1. It's reasonable to configure a helper which only handles "get"
while ignoring "store". Such a handler might not read stdin
for "store", thereby rapidly closing stdin upon helper exit.
2. A broken or misbehaving helper might exit immediately. That's an
error, but it's not reasonable for it to take down the parent Git
process with SIGPIPE.
Even with such a helper, seeing this problem should be rare. Getting
SIGPIPE requires the helper racily exiting before we've written the
fairly small credential output.
Signed-off-by: Erik E Brady <brady@xxxxxxxxx>
---
credential.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/credential.c b/credential.c
index 9747f47b1..62be651b0 100644
--- a/credential.c
+++ b/credential.c
@@ -5,6 +5,7 @@
#include "run-command.h"
#include "url.h"
#include "prompt.h"
+#include "sigchain.h"
void credential_init(struct credential *c)
{
@@ -227,8 +228,10 @@ static int run_credential_helper(struct credential *c,
return -1;
fp = xfdopen(helper.in, "w");
+ sigchain_push(SIGPIPE, SIG_IGN);
credential_write(c, fp);
fclose(fp);
+ sigchain_pop(SIGPIPE);
if (want_output) {
int r;
--
2.16.3.dirty
