commit a81cb9305e55dbcba81dac585ccdc4d086a1a9fe
author Milton D. Miller II <miltonm@us.ibm.com> Mon Mar 07 17:46:28 2016 -0600
committer Milton D. Miller II <miltonm@us.ibm.com> Mon Mar 07 17:46:28 2016 -0600
tree 61175ff42f8ee1f26dd62e4cdbbeff06fdded627
parent b8c5174dd737ac0c9ba46585bd8de997254290f3

init: Increase fidelity of u-boot environment parsing

Deleting a variable with a long value exposed a duplicate
openbmcinitdownloadurl variable resulting in two lines in the
url file, and wget was not happy.

The u-boot environment ends with a double NUL character like
many operating environments.  Using strings to separate on the
NUL bytes was loosing this information.

The fw_printenv command does not clear the remainder of the
environment when deleting variables.  Instead it just makes sure
it is terminated with a double NUL byte.

Switch from strings to tr to separate the strings.  Translate NL
to CR to avoid false matches, and use sed to detect a blank line.
Also use tail to skip over the CRC bytes.  We don't have the
config file to know if a flag exists so assume 1 copy for now.

Signed-off-by: Milton Miller <miltonm@us.ibm.com>