When we try to read from a remote-helper and get EOF or an
error, we print a message indicating that the helper died.
However, users may not know that a remote helper was in use
(e.g., when using git-over-http), or even what a remote
helper is.

Let's print the name of the helper (e.g., "git-remote-https");
this makes it more obvious what the program is for, and
provides a useful token for reporting bugs or searching for
more information (e.g., in manpages).

Signed-off-by: Jeff King <p...@peff.net>
 t/t5801-remote-helpers.sh | 2 +-
 transport-helper.c        | 8 ++++----
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/t/t5801-remote-helpers.sh b/t/t5801-remote-helpers.sh
index aafc46a..8b2cb68 100755
--- a/t/t5801-remote-helpers.sh
+++ b/t/t5801-remote-helpers.sh
@@ -182,7 +182,7 @@ test_expect_success 'proper failure checks for pushing' '
        cd local &&
        test_must_fail git push --all 2> error &&
        cat error &&
-       grep -q "Reading from remote helper failed" error
+       grep -q "Reading from helper .git-remote-testgit. failed" error
diff --git a/transport-helper.c b/transport-helper.c
index 96081cc..3fc43b9 100644
--- a/transport-helper.c
+++ b/transport-helper.c
@@ -46,7 +46,7 @@ static void sendline(struct helper_data *helper, struct 
strbuf *buffer)
                die_errno("Full write to remote helper failed");
-static int recvline_fh(FILE *helper, struct strbuf *buffer)
+static int recvline_fh(FILE *helper, struct strbuf *buffer, const char *name)
        if (debug)
@@ -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");
-               die("Reading from remote helper failed");
+               die("Reading from helper 'git-remote-%s' failed", name);
        if (debug)
@@ -64,7 +64,7 @@ static int recvline(struct helper_data *helper, struct strbuf 
 static int recvline(struct helper_data *helper, struct strbuf *buffer)
-       return recvline_fh(helper->out, buffer);
+       return recvline_fh(helper->out, buffer, helper->name);
 static void xchgline(struct helper_data *helper, struct strbuf *buffer)
@@ -536,7 +536,7 @@ static int process_connect_service(struct transport 
                goto exit;
        sendline(data, &cmdbuf);
-       recvline_fh(input, &cmdbuf);
+       recvline_fh(input, &cmdbuf, name);
        if (!strcmp(cmdbuf.buf, "")) {
                data->no_disconnect_req = 1;
                if (debug)
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