[PATCH 3/3] fastboot: avoid console_countdown_abort for getvar request

[Ahmad Fatoum <a.fatoum@pengutronix.de>]

We currently abort boot countdown on any fastboot communication at all
as we have the expectation that this is what the user wants.

This doesn't hold true on systems with fwupd: The fastboot plugin probes
connected devices:

  getvar:product
  getvar:version
  getvar:version-bootloader
  getvar:serialno
  getvar:secure

to determine whether an update is in-order. The first getvar will
automatically abort barebox boot up, which is likely not what the user
intended.

Therefore, let's abort console countdown only for non-getvar: requests.

Reported-by: Jonas Martin <j.martin@pengutronix.de>
Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
---
Cc: lgo@pengutronix.de
Cc: jlu@pengutronix.de
v1 -> v2:
  - add rationale for the change (fwupd)
  - use strstarts instead of strcmp_l1 removed in earlier patch
---
 common/fastboot.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/common/fastboot.c b/common/fastboot.c
index dc66d7123b02..66b59ab9b0d7 100644
--- a/common/fastboot.c
+++ b/common/fastboot.c
@@ -794,6 +794,11 @@ static void cb_erase(struct fastboot *fb, const char *cmd)
 		fastboot_tx_print(fb, FASTBOOT_MSG_OKAY, "");
 }
 
+static bool fastboot_cmd_should_abort(const char *cmdbuf)
+{
+	return !strstarts(cmdbuf, "getvar:");
+}
+
 struct cmd_dispatch_info {
 	char *cmd;
 	void (*cb)(struct fastboot *fb, const char *opt);
@@ -805,7 +810,8 @@ static void fb_run_command(struct fastboot *fb, const char *cmdbuf,
 	const struct cmd_dispatch_info *cmd;
 	int i;
 
-	console_countdown_abort("fastboot");
+	if (fastboot_cmd_should_abort(cmdbuf))
+		console_countdown_abort("fastboot");
 
 	for (i = 0; i < num_commands; i++) {
 		size_t cmdlen;
-- 
2.39.2