From ed7ed7dcbaf012be9d207fae1b51cf88f7cdb9fb Mon Sep 17 00:00:00 2001
From: lemoer <git@irrelefant.net>
Date: Sun, 3 Jun 2018 12:13:50 +0200
Subject: [PATCH] autoupdater: allow skipping the version check (#187)

this commit introduces a new cli flag "--force-version"
---
 admin/autoupdater/src/autoupdater.c | 9 ++++++++-
 admin/autoupdater/src/settings.h    | 1 +
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/admin/autoupdater/src/autoupdater.c b/admin/autoupdater/src/autoupdater.c
index 177e5d7..04f80ed 100644
--- a/admin/autoupdater/src/autoupdater.c
+++ b/admin/autoupdater/src/autoupdater.c
@@ -86,6 +86,7 @@ static void usage(void) {
 		"                       really flash a new firmware if one is available.\n\n"
 		"  --fallback           Upgrade if and only if the upgrade timespan of the new\n"
 		"                       version has passed for at least 24 hours.\n\n"
+		"  --force-version      Skip version check to allow downgrades.\n\n"
 		"  <mirror> ...         Override the mirror URLs given in the configuration. If\n"
 		"                       specified, these are not shuffled.\n\n",
 		stderr
@@ -100,6 +101,7 @@ static void parse_args(int argc, char *argv[], struct settings *settings) {
 		OPTION_HELP = 'h',
 		OPTION_NO_ACTION = 'n',
 		OPTION_FALLBACK = 256,
+		OPTION_FORCE_VERSION = 257,
 	};
 
 	const struct option options[] = {
@@ -107,6 +109,7 @@ static void parse_args(int argc, char *argv[], struct settings *settings) {
 		{"force",     no_argument,       NULL, OPTION_FORCE},
 		{"fallback",  no_argument,       NULL, OPTION_FALLBACK},
 		{"no-action", no_argument,       NULL, OPTION_NO_ACTION},
+		{"force-version", no_argument, NULL, OPTION_FORCE_VERSION},
 		{"help",      no_argument,       NULL, OPTION_HELP},
 	};
 
@@ -136,6 +139,10 @@ static void parse_args(int argc, char *argv[], struct settings *settings) {
 			settings->no_action = true;
 			break;
 
+		case OPTION_FORCE_VERSION:
+			settings->force_version = true;
+			break;
+
 		default:
 			usage();
 			exit(1);
@@ -321,7 +328,7 @@ static bool autoupdate(const char *mirror, struct settings *s, int lock_fd) {
 	}
 
 	/* Check version and update probability */
-	if (!newer_than(m->version, s->old_version)) {
+	if (!newer_than(m->version, s->old_version) && !s->force_version) {
 		puts("No new firmware available.");
 		ret = true;
 		goto out;
diff --git a/admin/autoupdater/src/settings.h b/admin/autoupdater/src/settings.h
index 54b98f6..7ed68d1 100644
--- a/admin/autoupdater/src/settings.h
+++ b/admin/autoupdater/src/settings.h
@@ -33,6 +33,7 @@ struct settings {
 	bool force;
 	bool fallback;
 	bool no_action;
+	bool force_version;
 	const char *branch;
 	unsigned long good_signatures;
 	char *old_version;