[PATCH 4/4] Improve error message when a transport helper was not found

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From: Ilari Liusvaara <ilari.liusvaara@xxxxxxxxxxx>

Perviously, the error message was:

    git: 'remote-foo' is not a git-command. See 'git --help'.

By not treating the transport helper as a git command, a more suitable
error is reported:

    fatal: Unable to find remote helper for 'foo'

Signed-off-by: Ilari Liusvaara <ilari.liusvaara@xxxxxxxxxxx>
Signed-off-by: Johannes Sixt <j6t@xxxxxxxx>
---
 While I agree mostly with the implementation of your patch, the justification
 was completely off, and I think it was because you did not notice that the
 parent process died from SIGPIPE. When patches 1-3/4 are applied, the
 parent does not die from SIGPIPE anymore, and the issue is now only minor
 (an unsuitable error message instead of no error message). Therefore,
 I rewrote the commit message to tone it down.

 -- Hannes

 transport-helper.c |   14 ++++++++++----
 1 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/transport-helper.c b/transport-helper.c
index 6ece0d9..d1bc3af 100644
--- a/transport-helper.c
+++ b/transport-helper.c
@@ -102,6 +102,7 @@ static struct child_process *get_helper(struct transport *transport)
 	int refspec_nr = 0;
 	int refspec_alloc = 0;
 	int duped;
+	int code;
 
 	if (data->helper)
 		return data->helper;
@@ -111,13 +112,18 @@ static struct child_process *get_helper(struct transport *transport)
 	helper->out = -1;
 	helper->err = 0;
 	helper->argv = xcalloc(4, sizeof(*helper->argv));
-	strbuf_addf(&buf, "remote-%s", data->name);
+	strbuf_addf(&buf, "git-remote-%s", data->name);
 	helper->argv[0] = strbuf_detach(&buf, NULL);
 	helper->argv[1] = transport->remote->name;
 	helper->argv[2] = remove_ext_force(transport->url);
-	helper->git_cmd = 1;
-	if (start_command(helper))
-		die("Unable to run helper: git %s", helper->argv[0]);
+	helper->git_cmd = 0;
+	helper->silent_exec_failure = 1;
+	code = start_command(helper);
+	if (code < 0 && errno == ENOENT)
+		die("Unable to find remote helper for '%s'", data->name);
+	else
+		exit(code);
+
 	data->helper = helper;
 	data->no_disconnect_req = 0;
 
-- 
1.6.6.115.gd1ab3
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