[LEDE-DEV] [PATCH procd 1/2] init: Propagate sysupgrade_exec_upgraded() return value

[Florian Fainelli]

chroot() can fail and its return value should be checked against so propagate
sysupgrade_exec_upgraded() return value to its caller.

Fixes: 63789e51ed91 ("init: add support for sysupgrades triggered from preinit")
Signed-off-by: Florian Fainelli <f.fainelli at gmail.com>
---
 system.c     |  7 +++----
 sysupgrade.c | 10 ++++++----
 sysupgrade.h |  2 +-
 3 files changed, 10 insertions(+), 9 deletions(-)

diff --git a/system.c b/system.c
index 6cd2b624b3be..59ddc214e6f6 100644
--- a/system.c
+++ b/system.c
@@ -400,10 +400,9 @@ static int sysupgrade(struct ubus_context *ctx, struct ubus_object *obj,
 	if (!tb[SYSUPGRADE_PATH] || !tb[SYSUPGRADE_PREFIX])
 		return UBUS_STATUS_INVALID_ARGUMENT;
 
-	sysupgrade_exec_upgraded(blobmsg_get_string(tb[SYSUPGRADE_PREFIX]),
-				 blobmsg_get_string(tb[SYSUPGRADE_PATH]),
-				 tb[SYSUPGRADE_COMMAND] ? blobmsg_get_string(tb[SYSUPGRADE_COMMAND]) : NULL);
-	return 0;
+	return sysupgrade_exec_upgraded(blobmsg_get_string(tb[SYSUPGRADE_PREFIX]),
+					blobmsg_get_string(tb[SYSUPGRADE_PATH]),
+					tb[SYSUPGRADE_COMMAND] ? blobmsg_get_string(tb[SYSUPGRADE_COMMAND]) : NULL);
 }
 
 static void
diff --git a/sysupgrade.c b/sysupgrade.c
index 30f1836135c9..13ba4050527d 100644
--- a/sysupgrade.c
+++ b/sysupgrade.c
@@ -22,14 +22,16 @@
 #include <unistd.h>
 
 
-void sysupgrade_exec_upgraded(const char *prefix, char *path, char *command)
+int sysupgrade_exec_upgraded(const char *prefix, char *path, char *command)
 {
 	char *wdt_fd = watchdog_fd();
 	char *argv[] = { "/sbin/upgraded", NULL, NULL, NULL};
+	int ret;
 
-	if (chroot(prefix)) {
+	ret = chroot(prefix);
+	if (ret < 0) {
 		fprintf(stderr, "Failed to chroot for upgraded exec.\n");
-		return;
+		return ret;
 	}
 
 	argv[1] = path;
@@ -45,5 +47,5 @@ void sysupgrade_exec_upgraded(const char *prefix, char *path, char *command)
 	fprintf(stderr, "Failed to exec upgraded.\n");
 	unsetenv("WDTFD");
 	watchdog_set_cloexec(true);
-	chroot(".");
+	return chroot(".");
 }
diff --git a/sysupgrade.h b/sysupgrade.h
index 8c09fc99d191..3887f71a00a6 100644
--- a/sysupgrade.h
+++ b/sysupgrade.h
@@ -15,7 +15,7 @@
 #define __PROCD_SYSUPGRADE_H
 
 
-void sysupgrade_exec_upgraded(const char *prefix, char *path, char *command);
+int sysupgrade_exec_upgraded(const char *prefix, char *path, char *command);
 
 
 #endif
-- 
2.11.0