installer: connman: Fix Wifi connection.
Issue reported by SergioBG here: https://lists.gnu.org/archive/html/bug-guix/2020-04/msg00432.html. Due to default buffering mode, the installer was reading from the pipe without having actually written a command before. * gnu/installer/connman.scm (connman-connect-with-auth): Set pipe buffering mode to 'line.
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@ -393,6 +393,7 @@ interactive connmanctl process."
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(dynamic-wind
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(const #t)
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(lambda ()
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(setvbuf pipe 'line)
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(run-connection-sequence pipe)
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#t)
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(lambda ()
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