Description:

After upgrading to netcfg v2.6.6, my wireless netcfg profile stopped working (see below for the profile).
The error was:

Failed to connect to wpa_supplicant - wpa_ctrl_open: No such file or directory

Running netcfg with NETCFG_DEBUG=1 gave the following.

DEBUG: Loading profile wpa
DEBUG: Configuring interface wlan0
:: wpa up
DEBUG: status reported to profile_up as:
DEBUG: Loading profile wpa
DEBUG: Configuring interface wlan0
DEBUG: wireless_up stop_wpa wlan0
DEBUG: wireless_up start_wpa wlan0 /etc/wpa_supplicant.conf nl80211,wext
DEBUG: wireless_up stop_wpa wlan0
DEBUG: wireless_up ifup
DEBUG: wireless_up start_wpa wlan0 /etc/wpa_supplicant.conf nl80211,wext
DEBUG: wireless_up wpa_check
DEBUG: wpa_cli -p udp)
. For example, ctrl_interface=SDDL=D: would set an empty
/var/run/wpa_supplicant -i wlan0 status
Failed to connect to wpa_supplicant - wpa_ctrl_open: No such file or directory
Failed to connect to wpa_supplicant - wpa_ctrl_open: No such file or directory
Failed to connect to wpa_supplicant - wpa_ctrl_open: No such file or directory
Failed to connect to wpa_supplicant - wpa_ctrl_open: No such file or directory
Failed to connect to wpa_supplicant - wpa_ctrl_open: No such file or directory
Failed to connect to wpa_supplicant - wpa_ctrl_open: No such file or directory
Failed to connect to wpa_supplicant - wpa_ctrl_open: No such file or directory
Failed to connect to wpa_supplicant - wpa_ctrl_open: No such file or directory
Failed to connect to wpa_supplicant - wpa_ctrl_open: No such file or directory
Failed to connect to wpa_supplicant - wpa_ctrl_open: No such file or directory
Failed to connect to wpa_supplicant - wpa_ctrl_open: No such file or directory
Failed to connect to wpa_supplicant - wpa_ctrl_open: No such file or directory
Failed to connect to wpa_supplicant - wpa_ctrl_open: No such file or directory

> WPA Authentication/Association Failed
DEBUG: profile_up connect failed


Notice especially this part:

DEBUG: wpa_cli -p udp)
. For example, ctrl_interface=SDDL=D: would set an empty
/var/run/wpa_supplicant -i wlan0 status

It turns out that netcfg does not ignore leading #s when parsing wpa_supplicant.conf,
as I believe it should. In /usr/lib/network/connections/wireless, I believe

WPA_CTRL_PATH=$(grep "ctrl_interface=" "$WPA_CONF" | cut -d= -f 2- | sed -r 's/DIR=(.*) +GROUP=.*/\1/')

should instead be something like

WPA_CTRL_PATH=$(grep "ctrl_interface=" "$WPA_CONF" | grep -v "^#" | cut -d= -f 2- | sed -r 's/DIR=(.*) +GROUP=.*/\1/')


Additional info:
netcfg v2.6.6

/etc/wpa_supplicant.conf attached (w/o network definitions).

My profile: /etc/network.d/wpa

CONNECTION="wireless"
DESCRIPTION="wpa_supplicant"
INTERFACE="wlan0"
SECURITY="wpa-config"
WPA_CONF="/etc/wpa_supplicant.conf"
IP="dhcp"