Hi Stephen,
On 23 January 2014 12:56, Stephen Warren swarren@wwwdotorg.org wrote:
From: Stephen Warren swarren@nvidia.com
This could be used in scripts such as:
if exists mmc 0:1 /boot/boot.scr; then load mmc 0:1 ${scriptaddr} /boot/boot.scr source ${scriptaddr} fi
rather than:
if load mmc 0:1 ${scriptaddr} /boot/boot.scr; then source ${scriptaddr} fi
This prevents errors being printed by attempts to load non-existent files, which can be important when checking for a large set of files, such as /boot/boot.scr.uimg, /boot/boot.scr, /boot/extlinux.conf, /boot.scr.uimg, /boot.scr, /extlinux.conf.
Change log?
Signed-off-by: Stephen Warren swarren@nvidia.com
Acked-by: Simon Glass sjg@chromium.org
Seems useful.
In addition, if it is just the error messages you are worried about (and I agree they should be eliminated) I wonder if we should consider adding a -e flag (or similar) to the read command to make it silently fail when the file does not exist? Arguably your code fragment above could be:
if load -e mmc 0:1 ${scriptaddr} /boot/boot.scr; then source ${scriptaddr} fi
Regards, Simon