[PATCH v3 2/2] transport-helper: check if remote helper is alive

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Otherwise transport-helper will continue checking for refs and other
things what will confuse the user more.
---
 git-remote-testgit        | 11 +++++++++++
 t/t5801-remote-helpers.sh | 19 +++++++++++++++++++
 transport-helper.c        |  8 ++++++++
 3 files changed, 38 insertions(+)

diff --git a/git-remote-testgit b/git-remote-testgit
index b395c8d..ca0cf09 100755
--- a/git-remote-testgit
+++ b/git-remote-testgit
@@ -61,12 +61,23 @@ do
 			echo "feature import-marks=$gitmarks"
 			echo "feature export-marks=$gitmarks"
 		fi
+
+		if test -n "$GIT_REMOTE_TESTGIT_FAILURE"
+		then
+			exit -1
+		fi
+
 		echo "feature done"
 		git fast-export "${testgitmarks_args[@]}" $refs |
 		sed -e "s#refs/heads/#${prefix}/heads/#g"
 		echo "done"
 		;;
 	export)
+		if test -n "$GIT_REMOTE_TESTGIT_FAILURE"
+		then
+			exit -1
+		fi
+
 		before=$(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..efe67e2 100755
--- a/t/t5801-remote-helpers.sh
+++ b/t/t5801-remote-helpers.sh
@@ -166,4 +166,23 @@ test_expect_success 'push ref with existing object' '
 	compare_refs local dup server dup
 '
 
+test_expect_success 'proper failure checks for fetching' '
+	(GIT_REMOTE_TESTGIT_FAILURE=1 &&
+	export GIT_REMOTE_TESTGIT_FAILURE &&
+	cd local &&
+	test_must_fail git fetch 2> error &&
+	grep "Error while running helper" error
+	)
+'
+
+# We sleep to give fast-export a chance to catch the SIGPIPE
+test_expect_failure '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 &&
+	grep "Error while running helper" error
+	)
+'
+
 test_done
diff --git a/transport-helper.c b/transport-helper.c
index cb3ef7d..dfdfa7a 100644
--- a/transport-helper.c
+++ b/transport-helper.c
@@ -460,6 +460,10 @@ static int fetch_with_import(struct transport *transport,
 
 	if (finish_command(&fastimport))
 		die("Error while running fast-import");
+
+	if (!check_command(data->helper))
+		die("Error while running helper");
+
 	argv_array_free_detached(fastimport.argv);
 
 	/*
@@ -818,6 +822,10 @@ static int push_refs_with_export(struct transport *transport,
 
 	if (finish_command(&exporter))
 		die("Error while running fast-export");
+
+	if (!check_command(data->helper))
+		die("Error while running helper");
+
 	push_update_refs_status(data, remote_refs);
 	return 0;
 }
-- 
1.8.2

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