[OpenWrt-Devel] [PATCH] uboot-env-tools be safer

Imran K gururug at gmail.com
Tue Dec 17 08:59:28 EST 2019

uboot-env-tools: Check for config prior to append

In the rare event a pre-populated fw_env.config exists in the rootfs prior
to firstboot, calling fw_setenv after the system has initialised will
annihilate the devices environment due to two identical lines in

Check for existence prior to blind appendage.

--- a/uboot-envtools.sh
+++ b/uboot-envtools.sh
@@ -31,6 +31,6 @@ ubootenv_add_app_config() {
  config_get envsize "$1" envsize
  config_get secsize "$1" secsize
  config_get numsec "$1" numsec
- echo "$dev $offset $envsize $secsize $numsec" >>/etc/fw_env.config
+ grep -q "$dev $offset $envsize $secsize $numsec" /etc/fw_env.config ||
echo "$dev $offset $envsize $secsize $numsec" >>/etc/fw_env.config

Signed-off-by: Imran Khan <gururug at gmail.com>
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