luci2-io-helper: bugfix buckup script read timeout

[feckert]

Reading files from stdin will block for ever. The uhttpd is killing the backup process after script_timeout.

Switching read to non blocking mode and add a waitpid for the slave process does not end in a script_timeout anymore.

Signed-off-by: Florian Eckert Eckert.Florian@googlemail.com

[jow-]

@feckert - thanks for keeping track of it and sorry that I wasn't able to help earlier, the change looks sane to me but it would be great if you could clean up the white space a bit. Put a space before and after while, put a space between if and (, no padding spaces within the condition.

[feckert]

Hello @jow-

I hope i have it made accurate now :-)

[jow-]

I merged this manually with two slight whitespace changes - thanks!