If a push fails because the remote-helper died (with fast-export), the
user might not see any error message. So let's add one.

Suggested-by: Jeff King <p...@peff.net>
Signed-off-by: Felipe Contreras <felipe.contre...@gmail.com>
---
 git-remote-testgit        | 11 +++++++++++
 t/t5801-remote-helpers.sh | 10 ++++++++++
 transport-helper.c        |  2 +-
 3 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/git-remote-testgit b/git-remote-testgit
index b395c8d..472ab1a 100755
--- a/git-remote-testgit
+++ b/git-remote-testgit
@@ -67,6 +67,17 @@ do
                echo "done"
                ;;
        export)
+               if test -n "$GIT_REMOTE_TESTGIT_FAILURE"
+               then
+                       # consume input so fast-export doesn't get SIGPIPE; we
+                       # want to test the remote-helper's code after
+                       # fast-export.
+                       while read line; do
+                               test "done" = "$line" && break
+                       done
+                       exit 1
+               fi
+
                before=$(git for-each-ref --format='%(refname) %(objectname)')
 
                git fast-import "${testgitmarks_args[@]}" --quiet
diff --git a/t/t5801-remote-helpers.sh b/t/t5801-remote-helpers.sh
index f387027..8d61702 100755
--- a/t/t5801-remote-helpers.sh
+++ b/t/t5801-remote-helpers.sh
@@ -166,4 +166,14 @@ test_expect_success 'push ref with existing object' '
        compare_refs local dup server dup
 '
 
+test_expect_success 'proper failure checks for pushing' '
+       (GIT_REMOTE_TESTGIT_FAILURE=1 &&
+       export GIT_REMOTE_TESTGIT_FAILURE &&
+       cd local &&
+       test_must_fail git push --all 2> error &&
+       cat error &&
+       grep -q "Reading from remote helper failed" error
+       )
+'
+
 test_done
diff --git a/transport-helper.c b/transport-helper.c
index cb3ef7d..96081cc 100644
--- a/transport-helper.c
+++ b/transport-helper.c
@@ -54,7 +54,7 @@ static int recvline_fh(FILE *helper, struct strbuf *buffer)
        if (strbuf_getline(buffer, helper, '\n') == EOF) {
                if (debug)
                        fprintf(stderr, "Debug: Remote helper quit.\n");
-               exit(128);
+               die("Reading from remote helper failed");
        }
 
        if (debug)
-- 
1.8.2.1

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